#undef NSIGSEGV
#define NSIGSEGV 3
-/*
- * SIGTRAP si_codes
- */
-#define TRAP_BRANCH (__SI_FAULT|3) /* process taken branch trap */
-#define TRAP_HWBKPT (__SI_FAULT|4) /* hardware breakpoint or watchpoint */
#undef NSIGTRAP
#define NSIGTRAP 4
#include <asm-generic/siginfo.h>
-/*
- * SIGTRAP si_codes
- */
-#define TRAP_BRANCH (__SI_FAULT|3) /* process taken branch trap */
-#define TRAP_HWBKPT (__SI_FAULT|4) /* hardware breakpoint or watchpoint */
#undef NSIGTRAP
#define NSIGTRAP 4
savesegment(es, tmp);
err |= __put_user(tmp, (unsigned int __user *)&sc->es);
- err |= __put_user((u32)regs->di, &sc->di);
- err |= __put_user((u32)regs->si, &sc->si);
- err |= __put_user((u32)regs->bp, &sc->bp);
- err |= __put_user((u32)regs->sp, &sc->sp);
- err |= __put_user((u32)regs->bx, &sc->bx);
- err |= __put_user((u32)regs->dx, &sc->dx);
- err |= __put_user((u32)regs->cx, &sc->cx);
- err |= __put_user((u32)regs->ax, &sc->ax);
- err |= __put_user((u32)regs->cs, &sc->cs);
- err |= __put_user((u32)regs->ss, &sc->ss);
+ err |= __put_user(regs->di, &sc->di);
+ err |= __put_user(regs->si, &sc->si);
+ err |= __put_user(regs->bp, &sc->bp);
+ err |= __put_user(regs->sp, &sc->sp);
+ err |= __put_user(regs->bx, &sc->bx);
+ err |= __put_user(regs->dx, &sc->dx);
+ err |= __put_user(regs->cx, &sc->cx);
+ err |= __put_user(regs->ax, &sc->ax);
+ err |= __put_user(regs->cs, &sc->cs);
+ err |= __put_user(regs->ss, &sc->ss);
err |= __put_user(current->thread.trap_no, &sc->trapno);
err |= __put_user(current->thread.error_code, &sc->err);
- err |= __put_user((u32)regs->ip, &sc->ip);
- err |= __put_user((u32)regs->flags, &sc->flags);
- err |= __put_user((u32)regs->sp, &sc->sp_at_signal);
+ err |= __put_user(regs->ip, &sc->ip);
+ err |= __put_user(regs->flags, &sc->flags);
+ err |= __put_user(regs->sp, &sc->sp_at_signal);
tmp = save_i387_xstate_ia32(fpstate);
if (tmp < 0)
err = -EFAULT;
- else {
- clear_used_math();
- stts();
+ else
err |= __put_user(ptr_to_compat(tmp ? fpstate : NULL),
&sc->fpstate);
- }
/* non-iBCS2 extensions.. */
err |= __put_user(mask, &sc->oldmask);
frame = get_sigframe(ka, regs, sizeof(*frame), &fpstate);
if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
- goto give_sigsegv;
+ return -EFAULT;
- err |= __put_user(sig, &frame->sig);
- if (err)
- goto give_sigsegv;
+ if (__put_user(sig, &frame->sig))
+ return -EFAULT;
- err |= ia32_setup_sigcontext(&frame->sc, fpstate, regs, set->sig[0]);
- if (err)
- goto give_sigsegv;
+ if (ia32_setup_sigcontext(&frame->sc, fpstate, regs, set->sig[0]))
+ return -EFAULT;
if (_COMPAT_NSIG_WORDS > 1) {
- err |= __copy_to_user(frame->extramask, &set->sig[1],
- sizeof(frame->extramask));
- if (err)
- goto give_sigsegv;
+ if (__copy_to_user(frame->extramask, &set->sig[1],
+ sizeof(frame->extramask)))
+ return -EFAULT;
}
if (ka->sa.sa_flags & SA_RESTORER) {
*/
err |= __copy_to_user(frame->retcode, &code, 8);
if (err)
- goto give_sigsegv;
+ return -EFAULT;
/* Set up registers for signal handler */
regs->sp = (unsigned long) frame;
#endif
return 0;
-
-give_sigsegv:
- force_sigsegv(sig, current);
- return -EFAULT;
}
int ia32_setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
frame = get_sigframe(ka, regs, sizeof(*frame), &fpstate);
if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
- goto give_sigsegv;
+ return -EFAULT;
err |= __put_user(sig, &frame->sig);
err |= __put_user(ptr_to_compat(&frame->info), &frame->pinfo);
err |= __put_user(ptr_to_compat(&frame->uc), &frame->puc);
err |= copy_siginfo_to_user32(&frame->info, info);
if (err)
- goto give_sigsegv;
+ return -EFAULT;
/* Create the ucontext. */
if (cpu_has_xsave)
regs, set->sig[0]);
err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
if (err)
- goto give_sigsegv;
+ return -EFAULT;
if (ka->sa.sa_flags & SA_RESTORER)
restorer = ka->sa.sa_restorer;
*/
err |= __copy_to_user(frame->retcode, &code, 8);
if (err)
- goto give_sigsegv;
+ return -EFAULT;
/* Set up registers for signal handler */
regs->sp = (unsigned long) frame;
#endif
return 0;
-
-give_sigsegv:
- force_sigsegv(sig, current);
- return -EFAULT;
}
# Do not profile debug and lowlevel utilities
CFLAGS_REMOVE_tsc.o = -pg
CFLAGS_REMOVE_rtc.o = -pg
-CFLAGS_REMOVE_paravirt.o = -pg
+CFLAGS_REMOVE_paravirt-spinlocks.o = -pg
endif
#
obj-$(CONFIG_VMI) += vmi_32.o vmiclock_32.o
obj-$(CONFIG_KVM_GUEST) += kvm.o
obj-$(CONFIG_KVM_CLOCK) += kvmclock.o
-obj-$(CONFIG_PARAVIRT) += paravirt.o paravirt_patch_$(BITS).o
+obj-$(CONFIG_PARAVIRT) += paravirt.o paravirt_patch_$(BITS).o paravirt-spinlocks.o
obj-$(CONFIG_PARAVIRT_CLOCK) += pvclock.o
obj-$(CONFIG_PCSPKR_PLATFORM) += pcspeaker.o
xsave_init();
}
-#ifdef CONFIG_HOTPLUG_CPU
-void __cpuinit cpu_uninit(void)
-{
- int cpu = raw_smp_processor_id();
- cpu_clear(cpu, cpu_initialized);
-
- /* lazy TLB state */
- per_cpu(cpu_tlbstate, cpu).state = 0;
- per_cpu(cpu_tlbstate, cpu).active_mm = &init_mm;
-}
-#endif
#endif
memset(newldt + oldsize * LDT_ENTRY_SIZE, 0,
(mincount - oldsize) * LDT_ENTRY_SIZE);
+ paravirt_alloc_ldt(newldt, mincount);
+
#ifdef CONFIG_X86_64
/* CHECKME: Do we really need this ? */
wmb();
#endif
}
if (oldsize) {
+ paravirt_free_ldt(oldldt, oldsize);
if (oldsize * LDT_ENTRY_SIZE > PAGE_SIZE)
vfree(oldldt);
else
static inline int copy_ldt(mm_context_t *new, mm_context_t *old)
{
int err = alloc_ldt(new, old->size, 0);
+ int i;
if (err < 0)
return err;
- memcpy(new->ldt, old->ldt, old->size * LDT_ENTRY_SIZE);
+
+ for(i = 0; i < old->size; i++)
+ write_ldt_entry(new->ldt, i, old->ldt + i * LDT_ENTRY_SIZE);
return 0;
}
if (mm == current->active_mm)
clear_LDT();
#endif
+ paravirt_free_ldt(mm->context.ldt, mm->context.size);
if (mm->context.size * LDT_ENTRY_SIZE > PAGE_SIZE)
vfree(mm->context.ldt);
else
--- /dev/null
+/*
+ * Split spinlock implementation out into its own file, so it can be
+ * compiled in a FTRACE-compatible way.
+ */
+#include <linux/spinlock.h>
+#include <linux/module.h>
+
+#include <asm/paravirt.h>
+
+static void default_spin_lock_flags(struct raw_spinlock *lock, unsigned long flags)
+{
+ __raw_spin_lock(lock);
+}
+
+struct pv_lock_ops pv_lock_ops = {
+#ifdef CONFIG_SMP
+ .spin_is_locked = __ticket_spin_is_locked,
+ .spin_is_contended = __ticket_spin_is_contended,
+
+ .spin_lock = __ticket_spin_lock,
+ .spin_lock_flags = default_spin_lock_flags,
+ .spin_trylock = __ticket_spin_trylock,
+ .spin_unlock = __ticket_spin_unlock,
+#endif
+};
+EXPORT_SYMBOL(pv_lock_ops);
+
+void __init paravirt_use_bytelocks(void)
+{
+#ifdef CONFIG_SMP
+ pv_lock_ops.spin_is_locked = __byte_spin_is_locked;
+ pv_lock_ops.spin_is_contended = __byte_spin_is_contended;
+ pv_lock_ops.spin_lock = __byte_spin_lock;
+ pv_lock_ops.spin_trylock = __byte_spin_trylock;
+ pv_lock_ops.spin_unlock = __byte_spin_unlock;
+#endif
+}
return __get_cpu_var(paravirt_lazy_mode);
}
-void __init paravirt_use_bytelocks(void)
-{
-#ifdef CONFIG_SMP
- pv_lock_ops.spin_is_locked = __byte_spin_is_locked;
- pv_lock_ops.spin_is_contended = __byte_spin_is_contended;
- pv_lock_ops.spin_lock = __byte_spin_lock;
- pv_lock_ops.spin_trylock = __byte_spin_trylock;
- pv_lock_ops.spin_unlock = __byte_spin_unlock;
-#endif
-}
-
struct pv_info pv_info = {
.name = "bare hardware",
.paravirt_enabled = 0,
.write_ldt_entry = native_write_ldt_entry,
.write_gdt_entry = native_write_gdt_entry,
.write_idt_entry = native_write_idt_entry,
+
+ .alloc_ldt = paravirt_nop,
+ .free_ldt = paravirt_nop,
+
.load_sp0 = native_load_sp0,
#if defined(CONFIG_X86_32) || defined(CONFIG_IA32_EMULATION)
.set_fixmap = native_set_fixmap,
};
-struct pv_lock_ops pv_lock_ops = {
-#ifdef CONFIG_SMP
- .spin_is_locked = __ticket_spin_is_locked,
- .spin_is_contended = __ticket_spin_is_contended,
-
- .spin_lock = __ticket_spin_lock,
- .spin_trylock = __ticket_spin_trylock,
- .spin_unlock = __ticket_spin_unlock,
-#endif
-};
-EXPORT_SYMBOL(pv_lock_ops);
-
EXPORT_SYMBOL_GPL(pv_time_ops);
EXPORT_SYMBOL (pv_cpu_ops);
EXPORT_SYMBOL (pv_mmu_ops);
return ((unsigned long *)tsk->thread.sp)[3];
}
-#ifdef CONFIG_HOTPLUG_CPU
-#include <asm/nmi.h>
-
-static void cpu_exit_clear(void)
-{
- int cpu = raw_smp_processor_id();
-
- idle_task_exit();
-
- cpu_uninit();
- irq_ctx_exit(cpu);
-
- cpu_clear(cpu, cpu_callout_map);
- cpu_clear(cpu, cpu_callin_map);
-
- numa_remove_cpu(cpu);
- c1e_remove_cpu(cpu);
-}
-
-/* We don't actually take CPU down, just spin without interrupts. */
-static inline void play_dead(void)
-{
- /* This must be done before dead CPU ack */
- cpu_exit_clear();
- mb();
- /* Ack it */
- __get_cpu_var(cpu_state) = CPU_DEAD;
-
- /*
- * With physical CPU hotplug, we should halt the cpu
- */
- local_irq_disable();
- /* mask all interrupts, flush any and all caches, and halt */
- wbinvd_halt();
-}
-#else
+#ifndef CONFIG_SMP
static inline void play_dead(void)
{
BUG();
}
-#endif /* CONFIG_HOTPLUG_CPU */
+#endif
/*
* The idle thread. There's no useful work to be
__exit_idle();
}
-#ifdef CONFIG_HOTPLUG_CPU
-DECLARE_PER_CPU(int, cpu_state);
-
-#include <linux/nmi.h>
-/* We halt the CPU with physical CPU hotplug */
-static inline void play_dead(void)
-{
- idle_task_exit();
- c1e_remove_cpu(raw_smp_processor_id());
-
- mb();
- /* Ack it */
- __get_cpu_var(cpu_state) = CPU_DEAD;
-
- local_irq_disable();
- /* mask all interrupts, flush any and all caches, and halt */
- wbinvd_halt();
-}
-#else
+#ifndef CONFIG_SMP
static inline void play_dead(void)
{
BUG();
}
-#endif /* CONFIG_HOTPLUG_CPU */
+#endif
/*
* The idle thread. There's no useful work to be
if (!p || p == current || p->state == TASK_RUNNING)
return 0;
stack = (unsigned long)task_stack_page(p);
- if (p->thread.sp < stack || p->thread.sp > stack+THREAD_SIZE)
+ if (p->thread.sp < stack || p->thread.sp >= stack+THREAD_SIZE)
return 0;
fp = *(u64 *)(p->thread.sp);
do {
if (fp < (unsigned long)stack ||
- fp > (unsigned long)stack+THREAD_SIZE)
+ fp >= (unsigned long)stack+THREAD_SIZE)
return 0;
ip = *(u64 *)(fp+8);
if (!in_sched_functions(ip))
#endif
}
-void send_sigtrap(struct task_struct *tsk, struct pt_regs *regs, int error_code)
+void send_sigtrap(struct task_struct *tsk, struct pt_regs *regs,
+ int error_code, int si_code)
{
struct siginfo info;
memset(&info, 0, sizeof(info));
info.si_signo = SIGTRAP;
- info.si_code = TRAP_BRKPT;
+ info.si_code = si_code;
/* User-mode ip? */
info.si_addr = user_mode_vm(regs) ? (void __user *) regs->ip : NULL;
*/
if (test_thread_flag(TIF_SINGLESTEP) &&
tracehook_consider_fatal_signal(current, SIGTRAP, SIG_DFL))
- send_sigtrap(current, regs, 0);
+ send_sigtrap(current, regs, 0, TRAP_BRKPT);
}
#include <asm/uaccess.h>
#include <asm/i387.h>
#include <asm/vdso.h>
+#include <asm/syscall.h>
#include <asm/syscalls.h>
#include "sigframe.h"
return do_sigaltstack(uss, uoss, regs->sp);
}
+#define COPY(x) { \
+ err |= __get_user(regs->x, &sc->x); \
+}
+
+#define COPY_SEG(seg) { \
+ unsigned short tmp; \
+ err |= __get_user(tmp, &sc->seg); \
+ regs->seg = tmp; \
+}
+
+#define COPY_SEG_STRICT(seg) { \
+ unsigned short tmp; \
+ err |= __get_user(tmp, &sc->seg); \
+ regs->seg = tmp | 3; \
+}
+
+#define GET_SEG(seg) { \
+ unsigned short tmp; \
+ err |= __get_user(tmp, &sc->seg); \
+ loadsegment(seg, tmp); \
+}
/*
* Do a signal return; undo the signal stack.
restore_sigcontext(struct pt_regs *regs, struct sigcontext __user *sc,
unsigned long *pax)
{
+ void __user *buf;
+ unsigned int tmpflags;
unsigned int err = 0;
/* Always make any pending restarted system calls return -EINTR */
current_thread_info()->restart_block.fn = do_no_restart_syscall;
-#define COPY(x) err |= __get_user(regs->x, &sc->x)
-
-#define COPY_SEG(seg) \
- { unsigned short tmp; \
- err |= __get_user(tmp, &sc->seg); \
- regs->seg = tmp; }
-
-#define COPY_SEG_STRICT(seg) \
- { unsigned short tmp; \
- err |= __get_user(tmp, &sc->seg); \
- regs->seg = tmp|3; }
-
-#define GET_SEG(seg) \
- { unsigned short tmp; \
- err |= __get_user(tmp, &sc->seg); \
- loadsegment(seg, tmp); }
-
GET_SEG(gs);
COPY_SEG(fs);
COPY_SEG(es);
COPY_SEG_STRICT(cs);
COPY_SEG_STRICT(ss);
- {
- unsigned int tmpflags;
-
- err |= __get_user(tmpflags, &sc->flags);
- regs->flags = (regs->flags & ~FIX_EFLAGS) |
- (tmpflags & FIX_EFLAGS);
- regs->orig_ax = -1; /* disable syscall checks */
- }
-
- {
- void __user *buf;
+ err |= __get_user(tmpflags, &sc->flags);
+ regs->flags = (regs->flags & ~FIX_EFLAGS) | (tmpflags & FIX_EFLAGS);
+ regs->orig_ax = -1; /* disable syscall checks */
- err |= __get_user(buf, &sc->fpstate);
- err |= restore_i387_xstate(buf);
- }
+ err |= __get_user(buf, &sc->fpstate);
+ err |= restore_i387_xstate(buf);
err |= __get_user(*pax, &sc->ax);
return err;
return 0;
}
-asmlinkage int sys_rt_sigreturn(unsigned long __unused)
+static long do_rt_sigreturn(struct pt_regs *regs)
{
- struct pt_regs *regs = (struct pt_regs *)&__unused;
struct rt_sigframe __user *frame;
unsigned long ax;
sigset_t set;
return ax;
badframe:
- force_sig(SIGSEGV, current);
+ signal_fault(regs, frame, "rt_sigreturn");
return 0;
}
+asmlinkage int sys_rt_sigreturn(unsigned long __unused)
+{
+ struct pt_regs *regs = (struct pt_regs *)&__unused;
+
+ return do_rt_sigreturn(regs);
+}
+
/*
* Set up a signal frame.
*/
}
static int
-setup_frame(int sig, struct k_sigaction *ka, sigset_t *set,
- struct pt_regs *regs)
+__setup_frame(int sig, struct k_sigaction *ka, sigset_t *set,
+ struct pt_regs *regs)
{
struct sigframe __user *frame;
void __user *restorer;
int err = 0;
- int usig;
void __user *fpstate = NULL;
frame = get_sigframe(ka, regs, sizeof(*frame), &fpstate);
if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
- goto give_sigsegv;
+ return -EFAULT;
- usig = current_thread_info()->exec_domain
- && current_thread_info()->exec_domain->signal_invmap
- && sig < 32
- ? current_thread_info()->exec_domain->signal_invmap[sig]
- : sig;
+ if (__put_user(sig, &frame->sig))
+ return -EFAULT;
- err = __put_user(usig, &frame->sig);
- if (err)
- goto give_sigsegv;
-
- err = setup_sigcontext(&frame->sc, fpstate, regs, set->sig[0]);
- if (err)
- goto give_sigsegv;
+ if (setup_sigcontext(&frame->sc, fpstate, regs, set->sig[0]))
+ return -EFAULT;
if (_NSIG_WORDS > 1) {
- err = __copy_to_user(&frame->extramask, &set->sig[1],
- sizeof(frame->extramask));
- if (err)
- goto give_sigsegv;
+ if (__copy_to_user(&frame->extramask, &set->sig[1],
+ sizeof(frame->extramask)))
+ return -EFAULT;
}
if (current->mm->context.vdso)
err |= __put_user(0x80cd, (short __user *)(frame->retcode+6));
if (err)
- goto give_sigsegv;
+ return -EFAULT;
/* Set up registers for signal handler */
regs->sp = (unsigned long)frame;
regs->cs = __USER_CS;
return 0;
-
-give_sigsegv:
- force_sigsegv(sig, current);
- return -EFAULT;
}
-static int setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
- sigset_t *set, struct pt_regs *regs)
+static int __setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
+ sigset_t *set, struct pt_regs *regs)
{
struct rt_sigframe __user *frame;
void __user *restorer;
int err = 0;
- int usig;
void __user *fpstate = NULL;
frame = get_sigframe(ka, regs, sizeof(*frame), &fpstate);
if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
- goto give_sigsegv;
-
- usig = current_thread_info()->exec_domain
- && current_thread_info()->exec_domain->signal_invmap
- && sig < 32
- ? current_thread_info()->exec_domain->signal_invmap[sig]
- : sig;
+ return -EFAULT;
- err |= __put_user(usig, &frame->sig);
+ err |= __put_user(sig, &frame->sig);
err |= __put_user(&frame->info, &frame->pinfo);
err |= __put_user(&frame->uc, &frame->puc);
err |= copy_siginfo_to_user(&frame->info, info);
if (err)
- goto give_sigsegv;
+ return -EFAULT;
/* Create the ucontext. */
if (cpu_has_xsave)
regs, set->sig[0]);
err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
if (err)
- goto give_sigsegv;
+ return -EFAULT;
/* Set up to return from userspace. */
restorer = VDSO32_SYMBOL(current->mm->context.vdso, rt_sigreturn);
err |= __put_user(0x80cd, (short __user *)(frame->retcode+5));
if (err)
- goto give_sigsegv;
+ return -EFAULT;
/* Set up registers for signal handler */
regs->sp = (unsigned long)frame;
regs->ip = (unsigned long)ka->sa.sa_handler;
- regs->ax = (unsigned long)usig;
+ regs->ax = (unsigned long)sig;
regs->dx = (unsigned long)&frame->info;
regs->cx = (unsigned long)&frame->uc;
regs->cs = __USER_CS;
return 0;
-
-give_sigsegv:
- force_sigsegv(sig, current);
- return -EFAULT;
}
/*
* OK, we're invoking a handler:
*/
+static int signr_convert(int sig)
+{
+ struct thread_info *info = current_thread_info();
+
+ if (info->exec_domain && info->exec_domain->signal_invmap && sig < 32)
+ return info->exec_domain->signal_invmap[sig];
+ return sig;
+}
+
+#define is_ia32 1
+#define ia32_setup_frame __setup_frame
+#define ia32_setup_rt_frame __setup_rt_frame
+
+static int
+setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
+ sigset_t *set, struct pt_regs *regs)
+{
+ int usig = signr_convert(sig);
+ int ret;
+
+ /* Set up the stack frame */
+ if (is_ia32) {
+ if (ka->sa.sa_flags & SA_SIGINFO)
+ ret = ia32_setup_rt_frame(usig, ka, info, set, regs);
+ else
+ ret = ia32_setup_frame(usig, ka, set, regs);
+ } else
+ ret = __setup_rt_frame(sig, ka, info, set, regs);
+
+ if (ret) {
+ force_sigsegv(sig, current);
+ return -EFAULT;
+ }
+
+ return ret;
+}
+
static int
handle_signal(unsigned long sig, siginfo_t *info, struct k_sigaction *ka,
sigset_t *oldset, struct pt_regs *regs)
int ret;
/* Are we from a system call? */
- if ((long)regs->orig_ax >= 0) {
+ if (syscall_get_nr(current, regs) >= 0) {
/* If so, check system call restarting.. */
- switch (regs->ax) {
+ switch (syscall_get_error(current, regs)) {
case -ERESTART_RESTARTBLOCK:
case -ERESTARTNOHAND:
regs->ax = -EINTR;
likely(test_and_clear_thread_flag(TIF_FORCED_TF)))
regs->flags &= ~X86_EFLAGS_TF;
- /* Set up the stack frame */
- if (ka->sa.sa_flags & SA_SIGINFO)
- ret = setup_rt_frame(sig, ka, info, oldset, regs);
- else
- ret = setup_frame(sig, ka, oldset, regs);
+ ret = setup_rt_frame(sig, ka, info, oldset, regs);
if (ret)
return ret;
+#ifdef CONFIG_X86_64
+ /*
+ * This has nothing to do with segment registers,
+ * despite the name. This magic affects uaccess.h
+ * macros' behavior. Reset it to the normal setting.
+ */
+ set_fs(USER_DS);
+#endif
+
/*
* Clear the direction flag as per the ABI for function entry.
*/
return 0;
}
+#define NR_restart_syscall __NR_restart_syscall
/*
* Note that 'init' is a special process: it doesn't get signals it doesn't
* want to handle. Thus you cannot kill init even with a SIGKILL even by
}
/* Did we come from a system call? */
- if ((long)regs->orig_ax >= 0) {
+ if (syscall_get_nr(current, regs) >= 0) {
/* Restart the system call - no handlers present */
- switch (regs->ax) {
+ switch (syscall_get_error(current, regs)) {
case -ERESTARTNOHAND:
case -ERESTARTSYS:
case -ERESTARTNOINTR:
break;
case -ERESTART_RESTARTBLOCK:
- regs->ax = __NR_restart_syscall;
+ regs->ax = NR_restart_syscall;
regs->ip -= 2;
break;
}
void
do_notify_resume(struct pt_regs *regs, void *unused, __u32 thread_info_flags)
{
+#if defined(CONFIG_X86_64) && defined(CONFIG_X86_MCE)
+ /* notify userspace of pending MCEs */
+ if (thread_info_flags & _TIF_MCE_NOTIFY)
+ mce_notify_user();
+#endif /* CONFIG_X86_64 && CONFIG_X86_MCE */
+
/* deal with pending signal delivery */
if (thread_info_flags & _TIF_SIGPENDING)
do_signal(regs);
tracehook_notify_resume(regs);
}
+#ifdef CONFIG_X86_32
clear_thread_flag(TIF_IRET);
+#endif /* CONFIG_X86_32 */
+}
+
+void signal_fault(struct pt_regs *regs, void __user *frame, char *where)
+{
+ struct task_struct *me = current;
+
+ if (show_unhandled_signals && printk_ratelimit()) {
+ printk(KERN_INFO
+ "%s[%d] bad frame in %s frame:%p ip:%lx sp:%lx orax:%lx",
+ me->comm, me->pid, where, frame,
+ regs->ip, regs->sp, regs->orig_ax);
+ print_vma_addr(" in ", regs->ip);
+ printk(KERN_CONT "\n");
+ }
+
+ force_sig(SIGSEGV, me);
}
return do_sigaltstack(uss, uoss, regs->sp);
}
+#define COPY(x) { \
+ err |= __get_user(regs->x, &sc->x); \
+}
+
+#define COPY_SEG_STRICT(seg) { \
+ unsigned short tmp; \
+ err |= __get_user(tmp, &sc->seg); \
+ regs->seg = tmp | 3; \
+}
+
/*
* Do a signal return; undo the signal stack.
*/
restore_sigcontext(struct pt_regs *regs, struct sigcontext __user *sc,
unsigned long *pax)
{
+ void __user *buf;
+ unsigned int tmpflags;
unsigned int err = 0;
/* Always make any pending restarted system calls return -EINTR */
current_thread_info()->restart_block.fn = do_no_restart_syscall;
-#define COPY(x) (err |= __get_user(regs->x, &sc->x))
-
COPY(di); COPY(si); COPY(bp); COPY(sp); COPY(bx);
COPY(dx); COPY(cx); COPY(ip);
COPY(r8);
/* Kernel saves and restores only the CS segment register on signals,
* which is the bare minimum needed to allow mixed 32/64-bit code.
* App's signal handler can save/restore other segments if needed. */
- {
- unsigned cs;
- err |= __get_user(cs, &sc->cs);
- regs->cs = cs | 3; /* Force into user mode */
- }
+ COPY_SEG_STRICT(cs);
- {
- unsigned int tmpflags;
- err |= __get_user(tmpflags, &sc->flags);
- regs->flags = (regs->flags & ~FIX_EFLAGS) | (tmpflags & FIX_EFLAGS);
- regs->orig_ax = -1; /* disable syscall checks */
- }
+ err |= __get_user(tmpflags, &sc->flags);
+ regs->flags = (regs->flags & ~FIX_EFLAGS) | (tmpflags & FIX_EFLAGS);
+ regs->orig_ax = -1; /* disable syscall checks */
- {
- struct _fpstate __user *buf;
- err |= __get_user(buf, &sc->fpstate);
- err |= restore_i387_xstate(buf);
- }
+ err |= __get_user(buf, &sc->fpstate);
+ err |= restore_i387_xstate(buf);
err |= __get_user(*pax, &sc->ax);
return err;
}
-asmlinkage long sys_rt_sigreturn(struct pt_regs *regs)
+static long do_rt_sigreturn(struct pt_regs *regs)
{
struct rt_sigframe __user *frame;
- sigset_t set;
unsigned long ax;
+ sigset_t set;
frame = (struct rt_sigframe __user *)(regs->sp - sizeof(long));
if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
return ax;
badframe:
- signal_fault(regs, frame, "sigreturn");
+ signal_fault(regs, frame, "rt_sigreturn");
return 0;
}
+asmlinkage long sys_rt_sigreturn(struct pt_regs *regs)
+{
+ return do_rt_sigreturn(regs);
+}
+
/*
* Set up a signal frame.
*/
return (void __user *)round_down(sp - size, 64);
}
-static int setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
- sigset_t *set, struct pt_regs *regs)
+static int __setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
+ sigset_t *set, struct pt_regs *regs)
{
struct rt_sigframe __user *frame;
void __user *fp = NULL;
(unsigned long)fp - sizeof(struct rt_sigframe), 16) - 8;
if (save_i387_xstate(fp) < 0)
- err |= -1;
+ return -EFAULT;
} else
frame = get_stack(ka, regs, sizeof(struct rt_sigframe)) - 8;
if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
- goto give_sigsegv;
+ return -EFAULT;
if (ka->sa.sa_flags & SA_SIGINFO) {
- err |= copy_siginfo_to_user(&frame->info, info);
- if (err)
- goto give_sigsegv;
+ if (copy_siginfo_to_user(&frame->info, info))
+ return -EFAULT;
}
/* Create the ucontext. */
err |= __put_user(ka->sa.sa_restorer, &frame->pretcode);
} else {
/* could use a vstub here */
- goto give_sigsegv;
+ return -EFAULT;
}
if (err)
- goto give_sigsegv;
+ return -EFAULT;
/* Set up registers for signal handler */
regs->di = sig;
regs->cs = __USER_CS;
return 0;
-
-give_sigsegv:
- force_sigsegv(sig, current);
- return -EFAULT;
}
/*
* OK, we're invoking a handler
*/
+static int signr_convert(int sig)
+{
+ return sig;
+}
+
+#ifdef CONFIG_IA32_EMULATION
+#define is_ia32 test_thread_flag(TIF_IA32)
+#else
+#define is_ia32 0
+#endif
+
+static int
+setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
+ sigset_t *set, struct pt_regs *regs)
+{
+ int usig = signr_convert(sig);
+ int ret;
+
+ /* Set up the stack frame */
+ if (is_ia32) {
+ if (ka->sa.sa_flags & SA_SIGINFO)
+ ret = ia32_setup_rt_frame(usig, ka, info, set, regs);
+ else
+ ret = ia32_setup_frame(usig, ka, set, regs);
+ } else
+ ret = __setup_rt_frame(sig, ka, info, set, regs);
+
+ if (ret) {
+ force_sigsegv(sig, current);
+ return -EFAULT;
+ }
+
+ return ret;
+}
static int
handle_signal(unsigned long sig, siginfo_t *info, struct k_sigaction *ka,
likely(test_and_clear_thread_flag(TIF_FORCED_TF)))
regs->flags &= ~X86_EFLAGS_TF;
-#ifdef CONFIG_IA32_EMULATION
- if (test_thread_flag(TIF_IA32)) {
- if (ka->sa.sa_flags & SA_SIGINFO)
- ret = ia32_setup_rt_frame(sig, ka, info, oldset, regs);
- else
- ret = ia32_setup_frame(sig, ka, oldset, regs);
- } else
-#endif
ret = setup_rt_frame(sig, ka, info, oldset, regs);
- if (ret == 0) {
- /*
- * This has nothing to do with segment registers,
- * despite the name. This magic affects uaccess.h
- * macros' behavior. Reset it to the normal setting.
- */
- set_fs(USER_DS);
+ if (ret)
+ return ret;
- /*
- * Clear the direction flag as per the ABI for function entry.
- */
- regs->flags &= ~X86_EFLAGS_DF;
+#ifdef CONFIG_X86_64
+ /*
+ * This has nothing to do with segment registers,
+ * despite the name. This magic affects uaccess.h
+ * macros' behavior. Reset it to the normal setting.
+ */
+ set_fs(USER_DS);
+#endif
- /*
- * Clear TF when entering the signal handler, but
- * notify any tracer that was single-stepping it.
- * The tracer may want to single-step inside the
- * handler too.
- */
- regs->flags &= ~X86_EFLAGS_TF;
+ /*
+ * Clear the direction flag as per the ABI for function entry.
+ */
+ regs->flags &= ~X86_EFLAGS_DF;
- spin_lock_irq(¤t->sighand->siglock);
- sigorsets(¤t->blocked, ¤t->blocked, &ka->sa.sa_mask);
- if (!(ka->sa.sa_flags & SA_NODEFER))
- sigaddset(¤t->blocked, sig);
- recalc_sigpending();
- spin_unlock_irq(¤t->sighand->siglock);
+ /*
+ * Clear TF when entering the signal handler, but
+ * notify any tracer that was single-stepping it.
+ * The tracer may want to single-step inside the
+ * handler too.
+ */
+ regs->flags &= ~X86_EFLAGS_TF;
- tracehook_signal_handler(sig, info, ka, regs,
- test_thread_flag(TIF_SINGLESTEP));
- }
+ spin_lock_irq(¤t->sighand->siglock);
+ sigorsets(¤t->blocked, ¤t->blocked, &ka->sa.sa_mask);
+ if (!(ka->sa.sa_flags & SA_NODEFER))
+ sigaddset(¤t->blocked, sig);
+ recalc_sigpending();
+ spin_unlock_irq(¤t->sighand->siglock);
- return ret;
+ tracehook_signal_handler(sig, info, ka, regs,
+ test_thread_flag(TIF_SINGLESTEP));
+
+ return 0;
}
+#define NR_restart_syscall \
+ test_thread_flag(TIF_IA32) ? __NR_ia32_restart_syscall : __NR_restart_syscall
/*
* Note that 'init' is a special process: it doesn't get signals it doesn't
* want to handle. Thus you cannot kill init even with a SIGKILL even by
signr = get_signal_to_deliver(&info, &ka, regs, NULL);
if (signr > 0) {
- /* Re-enable any watchpoints before delivering the
+ /*
+ * Re-enable any watchpoints before delivering the
* signal to user space. The processor register will
* have been cleared if the watchpoint triggered
* inside the kernel.
if (current->thread.debugreg7)
set_debugreg(current->thread.debugreg7, 7);
- /* Whee! Actually deliver the signal. */
+ /* Whee! Actually deliver the signal. */
if (handle_signal(signr, &info, &ka, oldset, regs) == 0) {
/*
* A signal was successfully delivered; the saved
regs->ax = regs->orig_ax;
regs->ip -= 2;
break;
+
case -ERESTART_RESTARTBLOCK:
- regs->ax = test_thread_flag(TIF_IA32) ?
- __NR_ia32_restart_syscall :
- __NR_restart_syscall;
+ regs->ax = NR_restart_syscall;
regs->ip -= 2;
break;
}
}
}
-void do_notify_resume(struct pt_regs *regs, void *unused,
- __u32 thread_info_flags)
+/*
+ * notification of userspace execution resumption
+ * - triggered by the TIF_WORK_MASK flags
+ */
+void
+do_notify_resume(struct pt_regs *regs, void *unused, __u32 thread_info_flags)
{
-#ifdef CONFIG_X86_MCE
+#if defined(CONFIG_X86_64) && defined(CONFIG_X86_MCE)
/* notify userspace of pending MCEs */
if (thread_info_flags & _TIF_MCE_NOTIFY)
mce_notify_user();
-#endif /* CONFIG_X86_MCE */
+#endif /* CONFIG_X86_64 && CONFIG_X86_MCE */
/* deal with pending signal delivery */
if (thread_info_flags & _TIF_SIGPENDING)
clear_thread_flag(TIF_NOTIFY_RESUME);
tracehook_notify_resume(regs);
}
+
+#ifdef CONFIG_X86_32
+ clear_thread_flag(TIF_IRET);
+#endif /* CONFIG_X86_32 */
}
void signal_fault(struct pt_regs *regs, void __user *frame, char *where)
{
struct task_struct *me = current;
+
if (show_unhandled_signals && printk_ratelimit()) {
- printk("%s[%d] bad frame in %s frame:%p ip:%lx sp:%lx orax:%lx",
- me->comm, me->pid, where, frame, regs->ip,
- regs->sp, regs->orig_ax);
+ printk(KERN_INFO
+ "%s[%d] bad frame in %s frame:%p ip:%lx sp:%lx orax:%lx",
+ me->comm, me->pid, where, frame,
+ regs->ip, regs->sp, regs->orig_ax);
print_vma_addr(" in ", regs->ip);
- printk("\n");
+ printk(KERN_CONT "\n");
}
force_sig(SIGSEGV, me);
struct smp_ops smp_ops = {
.smp_prepare_boot_cpu = native_smp_prepare_boot_cpu,
.smp_prepare_cpus = native_smp_prepare_cpus,
- .cpu_up = native_cpu_up,
.smp_cpus_done = native_smp_cpus_done,
.smp_send_stop = native_smp_send_stop,
.smp_send_reschedule = native_smp_send_reschedule,
+ .cpu_up = native_cpu_up,
+ .cpu_die = native_cpu_die,
+ .cpu_disable = native_cpu_disable,
+ .play_dead = native_play_dead,
+
.send_call_func_ipi = native_send_call_func_ipi,
.send_call_func_single_ipi = native_send_call_func_single_ipi,
};
#include <asm/desc.h>
#include <asm/nmi.h>
#include <asm/irq.h>
+#include <asm/idle.h>
#include <asm/smp.h>
#include <asm/trampoline.h>
#include <asm/cpu.h>
numa_remove_cpu(cpu);
}
-int __cpu_disable(void)
+void cpu_disable_common(void)
{
int cpu = smp_processor_id();
-
- /*
- * Perhaps use cpufreq to drop frequency, but that could go
- * into generic code.
- *
- * We won't take down the boot processor on i386 due to some
- * interrupts only being able to be serviced by the BSP.
- * Especially so if we're not using an IOAPIC -zwane
- */
- if (cpu == 0)
- return -EBUSY;
-
- if (nmi_watchdog == NMI_LOCAL_APIC)
- stop_apic_nmi_watchdog(NULL);
- clear_local_APIC();
-
/*
* HACK:
* Allow any queued timer interrupts to get serviced
remove_cpu_from_maps(cpu);
unlock_vector_lock();
fixup_irqs(cpu_online_map);
+}
+
+int native_cpu_disable(void)
+{
+ int cpu = smp_processor_id();
+
+ /*
+ * Perhaps use cpufreq to drop frequency, but that could go
+ * into generic code.
+ *
+ * We won't take down the boot processor on i386 due to some
+ * interrupts only being able to be serviced by the BSP.
+ * Especially so if we're not using an IOAPIC -zwane
+ */
+ if (cpu == 0)
+ return -EBUSY;
+
+ if (nmi_watchdog == NMI_LOCAL_APIC)
+ stop_apic_nmi_watchdog(NULL);
+ clear_local_APIC();
+
+ cpu_disable_common();
return 0;
}
-void __cpu_die(unsigned int cpu)
+void native_cpu_die(unsigned int cpu)
{
/* We don't do anything here: idle task is faking death itself. */
unsigned int i;
}
printk(KERN_ERR "CPU %u didn't die...\n", cpu);
}
+
+void play_dead_common(void)
+{
+ idle_task_exit();
+ reset_lazy_tlbstate();
+ irq_ctx_exit(raw_smp_processor_id());
+ c1e_remove_cpu(raw_smp_processor_id());
+
+ mb();
+ /* Ack it */
+ __get_cpu_var(cpu_state) = CPU_DEAD;
+
+ /*
+ * With physical CPU hotplug, we should halt the cpu
+ */
+ local_irq_disable();
+}
+
+void native_play_dead(void)
+{
+ play_dead_common();
+ wbinvd_halt();
+}
+
#else /* ... !CONFIG_HOTPLUG_CPU */
-int __cpu_disable(void)
+int native_cpu_disable(void)
{
return -ENOSYS;
}
-void __cpu_die(unsigned int cpu)
+void native_cpu_die(unsigned int cpu)
{
/* We said "no" in __cpu_disable */
BUG();
}
+
+void native_play_dead(void)
+{
+ BUG();
+}
+
#endif
on_each_cpu(do_flush_tlb_all, NULL, 1);
}
+void reset_lazy_tlbstate(void)
+{
+ int cpu = raw_smp_processor_id();
+
+ per_cpu(cpu_tlbstate, cpu).state = 0;
+ per_cpu(cpu_tlbstate, cpu).active_mm = &init_mm;
+}
+
{
struct task_struct *tsk = current;
unsigned int condition;
+ int si_code;
trace_hardirqs_fixup();
goto clear_TF_reenable;
}
+ si_code = get_si_code((unsigned long)condition);
/* Ok, finally something we can handle */
- send_sigtrap(tsk, regs, error_code);
+ send_sigtrap(tsk, regs, error_code, si_code);
/*
* Disable additional traps. They'll be re-enabled when
tsk->thread.error_code = error_code;
info.si_signo = SIGTRAP;
info.si_errno = 0;
- info.si_code = TRAP_BRKPT;
+ info.si_code = get_si_code(condition);
info.si_addr = user_mode(regs) ? (void __user *)regs->ip : NULL;
force_sig_info(SIGTRAP, &info, tsk);
.x86_cpu_dev.init : AT(ADDR(.x86_cpu_dev.init) - LOAD_OFFSET) {
*(.x86_cpu_dev.init)
}
- SECURITY_INIT
__x86_cpu_dev_end = .;
+ SECURITY_INIT
. = ALIGN(8);
.parainstructions : AT(ADDR(.parainstructions) - LOAD_OFFSET) {
void vmalloc_sync_all(void)
{
-#ifdef CONFIG_X86_32
- unsigned long start = VMALLOC_START & PGDIR_MASK;
unsigned long address;
+#ifdef CONFIG_X86_32
if (SHARED_KERNEL_PMD)
return;
- BUILD_BUG_ON(TASK_SIZE & ~PGDIR_MASK);
- for (address = start; address >= TASK_SIZE; address += PGDIR_SIZE) {
+ for (address = VMALLOC_START & PMD_MASK;
+ address >= TASK_SIZE && address < FIXADDR_TOP;
+ address += PMD_SIZE) {
unsigned long flags;
struct page *page;
spin_unlock_irqrestore(&pgd_lock, flags);
}
#else /* CONFIG_X86_64 */
- unsigned long start = VMALLOC_START & PGDIR_MASK;
- unsigned long address;
-
- for (address = start; address <= VMALLOC_END; address += PGDIR_SIZE) {
+ for (address = VMALLOC_START & PGDIR_MASK; address <= VMALLOC_END;
+ address += PGDIR_SIZE) {
const pgd_t *pgd_ref = pgd_offset_k(address);
unsigned long flags;
struct page *page;
*/
offset = phys_addr & ~PAGE_MASK;
phys_addr &= PAGE_MASK;
- size = PAGE_ALIGN(last_addr) - phys_addr;
+ size = PAGE_ALIGN(last_addr + 1) - phys_addr;
/*
* Mappings have to fit in the FIX_BTMAP area.
config XEN_SAVE_RESTORE
bool
- depends on PM
- default y
\ No newline at end of file
+ depends on XEN && PM
+ default y
+
+config XEN_DEBUG_FS
+ bool "Enable Xen debug and tuning parameters in debugfs"
+ depends on XEN && DEBUG_FS
+ default n
+ help
+ Enable statistics output and various tuning options in debugfs.
+ Enabling this option may incur a significant performance overhead.
-obj-y := enlighten.o setup.o multicalls.o mmu.o \
+ifdef CONFIG_FTRACE
+# Do not profile debug and lowlevel utilities
+CFLAGS_REMOVE_spinlock.o = -pg
+CFLAGS_REMOVE_time.o = -pg
+CFLAGS_REMOVE_irq.o = -pg
+endif
+
+obj-y := enlighten.o setup.o multicalls.o mmu.o irq.o \
time.o xen-asm_$(BITS).o grant-table.o suspend.o
-obj-$(CONFIG_SMP) += smp.o
+obj-$(CONFIG_SMP) += smp.o spinlock.o
+obj-$(CONFIG_XEN_DEBUG_FS) += debugfs.o
\ No newline at end of file
--- /dev/null
+#include <linux/init.h>
+#include <linux/debugfs.h>
+#include <linux/module.h>
+
+#include "debugfs.h"
+
+static struct dentry *d_xen_debug;
+
+struct dentry * __init xen_init_debugfs(void)
+{
+ if (!d_xen_debug) {
+ d_xen_debug = debugfs_create_dir("xen", NULL);
+
+ if (!d_xen_debug)
+ pr_warning("Could not create 'xen' debugfs directory\n");
+ }
+
+ return d_xen_debug;
+}
+
+struct array_data
+{
+ void *array;
+ unsigned elements;
+};
+
+static int u32_array_open(struct inode *inode, struct file *file)
+{
+ file->private_data = NULL;
+ return nonseekable_open(inode, file);
+}
+
+static size_t format_array(char *buf, size_t bufsize, const char *fmt,
+ u32 *array, unsigned array_size)
+{
+ size_t ret = 0;
+ unsigned i;
+
+ for(i = 0; i < array_size; i++) {
+ size_t len;
+
+ len = snprintf(buf, bufsize, fmt, array[i]);
+ len++; /* ' ' or '\n' */
+ ret += len;
+
+ if (buf) {
+ buf += len;
+ bufsize -= len;
+ buf[-1] = (i == array_size-1) ? '\n' : ' ';
+ }
+ }
+
+ ret++; /* \0 */
+ if (buf)
+ *buf = '\0';
+
+ return ret;
+}
+
+static char *format_array_alloc(const char *fmt, u32 *array, unsigned array_size)
+{
+ size_t len = format_array(NULL, 0, fmt, array, array_size);
+ char *ret;
+
+ ret = kmalloc(len, GFP_KERNEL);
+ if (ret == NULL)
+ return NULL;
+
+ format_array(ret, len, fmt, array, array_size);
+ return ret;
+}
+
+static ssize_t u32_array_read(struct file *file, char __user *buf, size_t len,
+ loff_t *ppos)
+{
+ struct inode *inode = file->f_path.dentry->d_inode;
+ struct array_data *data = inode->i_private;
+ size_t size;
+
+ if (*ppos == 0) {
+ if (file->private_data) {
+ kfree(file->private_data);
+ file->private_data = NULL;
+ }
+
+ file->private_data = format_array_alloc("%u", data->array, data->elements);
+ }
+
+ size = 0;
+ if (file->private_data)
+ size = strlen(file->private_data);
+
+ return simple_read_from_buffer(buf, len, ppos, file->private_data, size);
+}
+
+static int xen_array_release(struct inode *inode, struct file *file)
+{
+ kfree(file->private_data);
+
+ return 0;
+}
+
+static struct file_operations u32_array_fops = {
+ .owner = THIS_MODULE,
+ .open = u32_array_open,
+ .release= xen_array_release,
+ .read = u32_array_read,
+};
+
+struct dentry *xen_debugfs_create_u32_array(const char *name, mode_t mode,
+ struct dentry *parent,
+ u32 *array, unsigned elements)
+{
+ struct array_data *data = kmalloc(sizeof(*data), GFP_KERNEL);
+
+ if (data == NULL)
+ return NULL;
+
+ data->array = array;
+ data->elements = elements;
+
+ return debugfs_create_file(name, mode, parent, data, &u32_array_fops);
+}
--- /dev/null
+#ifndef _XEN_DEBUGFS_H
+#define _XEN_DEBUGFS_H
+
+struct dentry * __init xen_init_debugfs(void);
+
+struct dentry *xen_debugfs_create_u32_array(const char *name, mode_t mode,
+ struct dentry *parent,
+ u32 *array, unsigned elements);
+
+#endif /* _XEN_DEBUGFS_H */
#include <xen/interface/xen.h>
#include <xen/interface/physdev.h>
#include <xen/interface/vcpu.h>
-#include <xen/interface/sched.h>
#include <xen/features.h>
#include <xen/page.h>
#include <xen/hvc-console.h>
DEFINE_PER_CPU(struct vcpu_info *, xen_vcpu);
DEFINE_PER_CPU(struct vcpu_info, xen_vcpu_info);
+enum xen_domain_type xen_domain_type = XEN_NATIVE;
+EXPORT_SYMBOL_GPL(xen_domain_type);
+
/*
* Identity map, in addition to plain kernel map. This needs to be
* large enough to allocate page table pages to allocate the rest.
*
* 0: not available, 1: available
*/
-static int have_vcpu_info_placement = 1;
+static int have_vcpu_info_placement =
+#ifdef CONFIG_X86_32
+ 1
+#else
+ 0
+#endif
+ ;
+
static void xen_vcpu_setup(int cpu)
{
return HYPERVISOR_get_debugreg(reg);
}
-static unsigned long xen_save_fl(void)
+static void xen_leave_lazy(void)
{
- struct vcpu_info *vcpu;
- unsigned long flags;
-
- vcpu = x86_read_percpu(xen_vcpu);
-
- /* flag has opposite sense of mask */
- flags = !vcpu->evtchn_upcall_mask;
-
- /* convert to IF type flag
- -0 -> 0x00000000
- -1 -> 0xffffffff
- */
- return (-flags) & X86_EFLAGS_IF;
+ paravirt_leave_lazy(paravirt_get_lazy_mode());
+ xen_mc_flush();
}
-static void xen_restore_fl(unsigned long flags)
+static unsigned long xen_store_tr(void)
{
- struct vcpu_info *vcpu;
-
- /* convert from IF type flag */
- flags = !(flags & X86_EFLAGS_IF);
-
- /* There's a one instruction preempt window here. We need to
- make sure we're don't switch CPUs between getting the vcpu
- pointer and updating the mask. */
- preempt_disable();
- vcpu = x86_read_percpu(xen_vcpu);
- vcpu->evtchn_upcall_mask = flags;
- preempt_enable_no_resched();
-
- /* Doesn't matter if we get preempted here, because any
- pending event will get dealt with anyway. */
-
- if (flags == 0) {
- preempt_check_resched();
- barrier(); /* unmask then check (avoid races) */
- if (unlikely(vcpu->evtchn_upcall_pending))
- force_evtchn_callback();
- }
+ return 0;
}
-static void xen_irq_disable(void)
+/*
+ * Set the page permissions for a particular virtual address. If the
+ * address is a vmalloc mapping (or other non-linear mapping), then
+ * find the linear mapping of the page and also set its protections to
+ * match.
+ */
+static void set_aliased_prot(void *v, pgprot_t prot)
{
- /* There's a one instruction preempt window here. We need to
- make sure we're don't switch CPUs between getting the vcpu
- pointer and updating the mask. */
- preempt_disable();
- x86_read_percpu(xen_vcpu)->evtchn_upcall_mask = 1;
- preempt_enable_no_resched();
-}
+ int level;
+ pte_t *ptep;
+ pte_t pte;
+ unsigned long pfn;
+ struct page *page;
-static void xen_irq_enable(void)
-{
- struct vcpu_info *vcpu;
+ ptep = lookup_address((unsigned long)v, &level);
+ BUG_ON(ptep == NULL);
- /* We don't need to worry about being preempted here, since
- either a) interrupts are disabled, so no preemption, or b)
- the caller is confused and is trying to re-enable interrupts
- on an indeterminate processor. */
+ pfn = pte_pfn(*ptep);
+ page = pfn_to_page(pfn);
- vcpu = x86_read_percpu(xen_vcpu);
- vcpu->evtchn_upcall_mask = 0;
+ pte = pfn_pte(pfn, prot);
- /* Doesn't matter if we get preempted here, because any
- pending event will get dealt with anyway. */
+ if (HYPERVISOR_update_va_mapping((unsigned long)v, pte, 0))
+ BUG();
- barrier(); /* unmask then check (avoid races) */
- if (unlikely(vcpu->evtchn_upcall_pending))
- force_evtchn_callback();
-}
+ if (!PageHighMem(page)) {
+ void *av = __va(PFN_PHYS(pfn));
-static void xen_safe_halt(void)
-{
- /* Blocking includes an implicit local_irq_enable(). */
- if (HYPERVISOR_sched_op(SCHEDOP_block, NULL) != 0)
- BUG();
+ if (av != v)
+ if (HYPERVISOR_update_va_mapping((unsigned long)av, pte, 0))
+ BUG();
+ } else
+ kmap_flush_unused();
}
-static void xen_halt(void)
+static void xen_alloc_ldt(struct desc_struct *ldt, unsigned entries)
{
- if (irqs_disabled())
- HYPERVISOR_vcpu_op(VCPUOP_down, smp_processor_id(), NULL);
- else
- xen_safe_halt();
-}
+ const unsigned entries_per_page = PAGE_SIZE / LDT_ENTRY_SIZE;
+ int i;
-static void xen_leave_lazy(void)
-{
- paravirt_leave_lazy(paravirt_get_lazy_mode());
- xen_mc_flush();
+ for(i = 0; i < entries; i += entries_per_page)
+ set_aliased_prot(ldt + i, PAGE_KERNEL_RO);
}
-static unsigned long xen_store_tr(void)
+static void xen_free_ldt(struct desc_struct *ldt, unsigned entries)
{
- return 0;
+ const unsigned entries_per_page = PAGE_SIZE / LDT_ENTRY_SIZE;
+ int i;
+
+ for(i = 0; i < entries; i += entries_per_page)
+ set_aliased_prot(ldt + i, PAGE_KERNEL);
}
static void xen_set_ldt(const void *addr, unsigned entries)
static void xen_write_ldt_entry(struct desc_struct *dt, int entrynum,
const void *ptr)
{
- unsigned long lp = (unsigned long)&dt[entrynum];
- xmaddr_t mach_lp = virt_to_machine(lp);
+ xmaddr_t mach_lp = arbitrary_virt_to_machine(&dt[entrynum]);
u64 entry = *(u64 *)ptr;
preempt_disable();
}
static void xen_load_sp0(struct tss_struct *tss,
- struct thread_struct *thread)
+ struct thread_struct *thread)
{
struct multicall_space mcs = xen_mc_entry(0);
MULTI_stack_switch(mcs.mc, __KERNEL_DS, thread->sp0);
ret = -EFAULT;
break;
#endif
+
+ case MSR_STAR:
+ case MSR_CSTAR:
+ case MSR_LSTAR:
+ case MSR_SYSCALL_MASK:
+ case MSR_IA32_SYSENTER_CS:
+ case MSR_IA32_SYSENTER_ESP:
+ case MSR_IA32_SYSENTER_EIP:
+ /* Fast syscall setup is all done in hypercalls, so
+ these are all ignored. Stub them out here to stop
+ Xen console noise. */
+ break;
+
default:
ret = native_write_msr_safe(msr, low, high);
}
SetPagePinned(page);
if (!PageHighMem(page)) {
- make_lowmem_page_readonly(__va(PFN_PHYS(pfn)));
- if (level == PT_PTE)
+ make_lowmem_page_readonly(__va(PFN_PHYS((unsigned long)pfn)));
+ if (level == PT_PTE && USE_SPLIT_PTLOCKS)
pin_pagetable_pfn(MMUEXT_PIN_L1_TABLE, pfn);
} else
/* make sure there are no stray mappings of
if (PagePinned(page)) {
if (!PageHighMem(page)) {
- if (level == PT_PTE)
+ if (level == PT_PTE && USE_SPLIT_PTLOCKS)
pin_pagetable_pfn(MMUEXT_UNPIN_TABLE, pfn);
make_lowmem_page_readwrite(__va(PFN_PHYS(pfn)));
}
}
#endif
+#ifdef CONFIG_X86_32
static __init pte_t mask_rw_pte(pte_t *ptep, pte_t pte)
{
/* If there's an existing pte, then don't allow _PAGE_RW to be set */
xen_set_pte(ptep, pte);
}
+#endif
static __init void xen_pagetable_setup_start(pgd_t *base)
{
/* xen_vcpu_setup managed to place the vcpu_info within the
percpu area for all cpus, so make use of it */
-#ifdef CONFIG_X86_32
if (have_vcpu_info_placement) {
printk(KERN_INFO "Xen: using vcpu_info placement\n");
pv_irq_ops.irq_enable = xen_irq_enable_direct;
pv_mmu_ops.read_cr2 = xen_read_cr2_direct;
}
-#endif
}
static unsigned xen_patch(u8 type, u16 clobbers, void *insnbuf,
goto patch_site
switch (type) {
-#ifdef CONFIG_X86_32
SITE(pv_irq_ops, irq_enable);
SITE(pv_irq_ops, irq_disable);
SITE(pv_irq_ops, save_fl);
SITE(pv_irq_ops, restore_fl);
-#endif /* CONFIG_X86_32 */
#undef SITE
patch_site:
.load_gs_index = xen_load_gs_index,
#endif
+ .alloc_ldt = xen_alloc_ldt,
+ .free_ldt = xen_free_ldt,
+
.store_gdt = native_store_gdt,
.store_idt = native_store_idt,
.store_tr = xen_store_tr,
},
};
-static void __init __xen_init_IRQ(void)
-{
-#ifdef CONFIG_X86_64
- int i;
-
- /* Create identity vector->irq map */
- for(i = 0; i < NR_VECTORS; i++) {
- int cpu;
-
- for_each_possible_cpu(cpu)
- per_cpu(vector_irq, cpu)[i] = i;
- }
-#endif /* CONFIG_X86_64 */
-
- xen_init_IRQ();
-}
-
-static const struct pv_irq_ops xen_irq_ops __initdata = {
- .init_IRQ = __xen_init_IRQ,
- .save_fl = xen_save_fl,
- .restore_fl = xen_restore_fl,
- .irq_disable = xen_irq_disable,
- .irq_enable = xen_irq_enable,
- .safe_halt = xen_safe_halt,
- .halt = xen_halt,
-#ifdef CONFIG_X86_64
- .adjust_exception_frame = xen_adjust_exception_frame,
-#endif
-};
-
static const struct pv_apic_ops xen_apic_ops __initdata = {
#ifdef CONFIG_X86_LOCAL_APIC
.setup_boot_clock = paravirt_nop,
if (HYPERVISOR_xen_version(XENVER_platform_parameters, &pp) == 0)
top = pp.virt_start;
- reserve_top_address(-top + 2 * PAGE_SIZE);
+ reserve_top_address(-top);
#endif /* CONFIG_X86_32 */
}
return __ka(m2p(maddr));
}
-#ifdef CONFIG_X86_64
-static void walk(pgd_t *pgd, unsigned long addr)
-{
- unsigned l4idx = pgd_index(addr);
- unsigned l3idx = pud_index(addr);
- unsigned l2idx = pmd_index(addr);
- unsigned l1idx = pte_index(addr);
- pgd_t l4;
- pud_t l3;
- pmd_t l2;
- pte_t l1;
-
- xen_raw_printk("walk %p, %lx -> %d %d %d %d\n",
- pgd, addr, l4idx, l3idx, l2idx, l1idx);
-
- l4 = pgd[l4idx];
- xen_raw_printk(" l4: %016lx\n", l4.pgd);
- xen_raw_printk(" %016lx\n", pgd_val(l4));
-
- l3 = ((pud_t *)(m2v(l4.pgd)))[l3idx];
- xen_raw_printk(" l3: %016lx\n", l3.pud);
- xen_raw_printk(" %016lx\n", pud_val(l3));
-
- l2 = ((pmd_t *)(m2v(l3.pud)))[l2idx];
- xen_raw_printk(" l2: %016lx\n", l2.pmd);
- xen_raw_printk(" %016lx\n", pmd_val(l2));
-
- l1 = ((pte_t *)(m2v(l2.pmd)))[l1idx];
- xen_raw_printk(" l1: %016lx\n", l1.pte);
- xen_raw_printk(" %016lx\n", pte_val(l1));
-}
-#endif
-
static void set_page_prot(void *addr, pgprot_t prot)
{
unsigned long pfn = __pa(addr) >> PAGE_SHIFT;
pte_t pte = pfn_pte(pfn, prot);
- xen_raw_printk("addr=%p pfn=%lx mfn=%lx prot=%016llx pte=%016llx\n",
- addr, pfn, get_phys_to_machine(pfn),
- pgprot_val(prot), pte.pte);
-
if (HYPERVISOR_update_va_mapping((unsigned long)addr, pte, 0))
BUG();
}
if (!xen_start_info)
return;
+ xen_domain_type = XEN_PV_DOMAIN;
+
BUG_ON(memcmp(xen_start_info->magic, "xen-3", 5) != 0);
xen_setup_features();
pv_init_ops = xen_init_ops;
pv_time_ops = xen_time_ops;
pv_cpu_ops = xen_cpu_ops;
- pv_irq_ops = xen_irq_ops;
pv_apic_ops = xen_apic_ops;
pv_mmu_ops = xen_mmu_ops;
+ xen_init_irq_ops();
+
#ifdef CONFIG_X86_LOCAL_APIC
/*
* set up the basic apic ops.
/* Prevent unwanted bits from being set in PTEs. */
__supported_pte_mask &= ~_PAGE_GLOBAL;
- if (!is_initial_xendomain())
+ if (!xen_initial_domain())
__supported_pte_mask &= ~(_PAGE_PWT | _PAGE_PCD);
/* Don't do the full vcpu_info placement stuff until we have a
boot_params.hdr.ramdisk_size = xen_start_info->mod_len;
boot_params.hdr.cmd_line_ptr = __pa(xen_start_info->cmd_line);
- if (!is_initial_xendomain()) {
+ if (!xen_initial_domain()) {
add_preferred_console("xenboot", 0, NULL);
add_preferred_console("tty", 0, NULL);
add_preferred_console("hvc", 0, NULL);
xen_raw_console_write("about to get started...\n");
-#if 0
- xen_raw_printk("&boot_params=%p __pa(&boot_params)=%lx __va(__pa(&boot_params))=%lx\n",
- &boot_params, __pa_symbol(&boot_params),
- __va(__pa_symbol(&boot_params)));
-
- walk(pgd, &boot_params);
- walk(pgd, __va(__pa(&boot_params)));
-#endif
-
/* Start the world */
#ifdef CONFIG_X86_32
i386_start_kernel();
--- /dev/null
+#include <linux/hardirq.h>
+
+#include <xen/interface/xen.h>
+#include <xen/interface/sched.h>
+#include <xen/interface/vcpu.h>
+
+#include <asm/xen/hypercall.h>
+#include <asm/xen/hypervisor.h>
+
+#include "xen-ops.h"
+
+/*
+ * Force a proper event-channel callback from Xen after clearing the
+ * callback mask. We do this in a very simple manner, by making a call
+ * down into Xen. The pending flag will be checked by Xen on return.
+ */
+void xen_force_evtchn_callback(void)
+{
+ (void)HYPERVISOR_xen_version(0, NULL);
+}
+
+static void __init __xen_init_IRQ(void)
+{
+#ifdef CONFIG_X86_64
+ int i;
+
+ /* Create identity vector->irq map */
+ for(i = 0; i < NR_VECTORS; i++) {
+ int cpu;
+
+ for_each_possible_cpu(cpu)
+ per_cpu(vector_irq, cpu)[i] = i;
+ }
+#endif /* CONFIG_X86_64 */
+
+ xen_init_IRQ();
+}
+
+static unsigned long xen_save_fl(void)
+{
+ struct vcpu_info *vcpu;
+ unsigned long flags;
+
+ vcpu = x86_read_percpu(xen_vcpu);
+
+ /* flag has opposite sense of mask */
+ flags = !vcpu->evtchn_upcall_mask;
+
+ /* convert to IF type flag
+ -0 -> 0x00000000
+ -1 -> 0xffffffff
+ */
+ return (-flags) & X86_EFLAGS_IF;
+}
+
+static void xen_restore_fl(unsigned long flags)
+{
+ struct vcpu_info *vcpu;
+
+ /* convert from IF type flag */
+ flags = !(flags & X86_EFLAGS_IF);
+
+ /* There's a one instruction preempt window here. We need to
+ make sure we're don't switch CPUs between getting the vcpu
+ pointer and updating the mask. */
+ preempt_disable();
+ vcpu = x86_read_percpu(xen_vcpu);
+ vcpu->evtchn_upcall_mask = flags;
+ preempt_enable_no_resched();
+
+ /* Doesn't matter if we get preempted here, because any
+ pending event will get dealt with anyway. */
+
+ if (flags == 0) {
+ preempt_check_resched();
+ barrier(); /* unmask then check (avoid races) */
+ if (unlikely(vcpu->evtchn_upcall_pending))
+ xen_force_evtchn_callback();
+ }
+}
+
+static void xen_irq_disable(void)
+{
+ /* There's a one instruction preempt window here. We need to
+ make sure we're don't switch CPUs between getting the vcpu
+ pointer and updating the mask. */
+ preempt_disable();
+ x86_read_percpu(xen_vcpu)->evtchn_upcall_mask = 1;
+ preempt_enable_no_resched();
+}
+
+static void xen_irq_enable(void)
+{
+ struct vcpu_info *vcpu;
+
+ /* We don't need to worry about being preempted here, since
+ either a) interrupts are disabled, so no preemption, or b)
+ the caller is confused and is trying to re-enable interrupts
+ on an indeterminate processor. */
+
+ vcpu = x86_read_percpu(xen_vcpu);
+ vcpu->evtchn_upcall_mask = 0;
+
+ /* Doesn't matter if we get preempted here, because any
+ pending event will get dealt with anyway. */
+
+ barrier(); /* unmask then check (avoid races) */
+ if (unlikely(vcpu->evtchn_upcall_pending))
+ xen_force_evtchn_callback();
+}
+
+static void xen_safe_halt(void)
+{
+ /* Blocking includes an implicit local_irq_enable(). */
+ if (HYPERVISOR_sched_op(SCHEDOP_block, NULL) != 0)
+ BUG();
+}
+
+static void xen_halt(void)
+{
+ if (irqs_disabled())
+ HYPERVISOR_vcpu_op(VCPUOP_down, smp_processor_id(), NULL);
+ else
+ xen_safe_halt();
+}
+
+static const struct pv_irq_ops xen_irq_ops __initdata = {
+ .init_IRQ = __xen_init_IRQ,
+ .save_fl = xen_save_fl,
+ .restore_fl = xen_restore_fl,
+ .irq_disable = xen_irq_disable,
+ .irq_enable = xen_irq_enable,
+ .safe_halt = xen_safe_halt,
+ .halt = xen_halt,
+#ifdef CONFIG_X86_64
+ .adjust_exception_frame = xen_adjust_exception_frame,
+#endif
+};
+
+void __init xen_init_irq_ops()
+{
+ pv_irq_ops = xen_irq_ops;
+}
*/
#include <linux/sched.h>
#include <linux/highmem.h>
+#include <linux/debugfs.h>
#include <linux/bug.h>
#include <asm/pgtable.h>
#include "multicalls.h"
#include "mmu.h"
+#include "debugfs.h"
+
+#define MMU_UPDATE_HISTO 30
+
+#ifdef CONFIG_XEN_DEBUG_FS
+
+static struct {
+ u32 pgd_update;
+ u32 pgd_update_pinned;
+ u32 pgd_update_batched;
+
+ u32 pud_update;
+ u32 pud_update_pinned;
+ u32 pud_update_batched;
+
+ u32 pmd_update;
+ u32 pmd_update_pinned;
+ u32 pmd_update_batched;
+
+ u32 pte_update;
+ u32 pte_update_pinned;
+ u32 pte_update_batched;
+
+ u32 mmu_update;
+ u32 mmu_update_extended;
+ u32 mmu_update_histo[MMU_UPDATE_HISTO];
+
+ u32 prot_commit;
+ u32 prot_commit_batched;
+
+ u32 set_pte_at;
+ u32 set_pte_at_batched;
+ u32 set_pte_at_pinned;
+ u32 set_pte_at_current;
+ u32 set_pte_at_kernel;
+} mmu_stats;
+
+static u8 zero_stats;
+
+static inline void check_zero(void)
+{
+ if (unlikely(zero_stats)) {
+ memset(&mmu_stats, 0, sizeof(mmu_stats));
+ zero_stats = 0;
+ }
+}
+
+#define ADD_STATS(elem, val) \
+ do { check_zero(); mmu_stats.elem += (val); } while(0)
+
+#else /* !CONFIG_XEN_DEBUG_FS */
+
+#define ADD_STATS(elem, val) do { (void)(val); } while(0)
+
+#endif /* CONFIG_XEN_DEBUG_FS */
/*
* Just beyond the highest usermode address. STACK_TOP_MAX has a
}
-static bool page_pinned(void *ptr)
+static bool xen_page_pinned(void *ptr)
{
struct page *page = virt_to_page(ptr);
return PagePinned(page);
}
-static void extend_mmu_update(const struct mmu_update *update)
+static void xen_extend_mmu_update(const struct mmu_update *update)
{
struct multicall_space mcs;
struct mmu_update *u;
mcs = xen_mc_extend_args(__HYPERVISOR_mmu_update, sizeof(*u));
- if (mcs.mc != NULL)
+ if (mcs.mc != NULL) {
+ ADD_STATS(mmu_update_extended, 1);
+ ADD_STATS(mmu_update_histo[mcs.mc->args[1]], -1);
+
mcs.mc->args[1]++;
- else {
+
+ if (mcs.mc->args[1] < MMU_UPDATE_HISTO)
+ ADD_STATS(mmu_update_histo[mcs.mc->args[1]], 1);
+ else
+ ADD_STATS(mmu_update_histo[0], 1);
+ } else {
+ ADD_STATS(mmu_update, 1);
mcs = __xen_mc_entry(sizeof(*u));
MULTI_mmu_update(mcs.mc, mcs.args, 1, NULL, DOMID_SELF);
+ ADD_STATS(mmu_update_histo[1], 1);
}
u = mcs.args;
/* ptr may be ioremapped for 64-bit pagetable setup */
u.ptr = arbitrary_virt_to_machine(ptr).maddr;
u.val = pmd_val_ma(val);
- extend_mmu_update(&u);
+ xen_extend_mmu_update(&u);
+
+ ADD_STATS(pmd_update_batched, paravirt_get_lazy_mode() == PARAVIRT_LAZY_MMU);
xen_mc_issue(PARAVIRT_LAZY_MMU);
void xen_set_pmd(pmd_t *ptr, pmd_t val)
{
+ ADD_STATS(pmd_update, 1);
+
/* If page is not pinned, we can just update the entry
directly */
- if (!page_pinned(ptr)) {
+ if (!xen_page_pinned(ptr)) {
*ptr = val;
return;
}
+ ADD_STATS(pmd_update_pinned, 1);
+
xen_set_pmd_hyper(ptr, val);
}
if (mm == &init_mm)
preempt_disable();
+ ADD_STATS(set_pte_at, 1);
+// ADD_STATS(set_pte_at_pinned, xen_page_pinned(ptep));
+ ADD_STATS(set_pte_at_current, mm == current->mm);
+ ADD_STATS(set_pte_at_kernel, mm == &init_mm);
+
if (mm == current->mm || mm == &init_mm) {
if (paravirt_get_lazy_mode() == PARAVIRT_LAZY_MMU) {
struct multicall_space mcs;
mcs = xen_mc_entry(0);
MULTI_update_va_mapping(mcs.mc, addr, pteval, 0);
+ ADD_STATS(set_pte_at_batched, 1);
xen_mc_issue(PARAVIRT_LAZY_MMU);
goto out;
} else
u.ptr = virt_to_machine(ptep).maddr | MMU_PT_UPDATE_PRESERVE_AD;
u.val = pte_val_ma(pte);
- extend_mmu_update(&u);
+ xen_extend_mmu_update(&u);
+
+ ADD_STATS(prot_commit, 1);
+ ADD_STATS(prot_commit_batched, paravirt_get_lazy_mode() == PARAVIRT_LAZY_MMU);
xen_mc_issue(PARAVIRT_LAZY_MMU);
}
/* ptr may be ioremapped for 64-bit pagetable setup */
u.ptr = arbitrary_virt_to_machine(ptr).maddr;
u.val = pud_val_ma(val);
- extend_mmu_update(&u);
+ xen_extend_mmu_update(&u);
+
+ ADD_STATS(pud_update_batched, paravirt_get_lazy_mode() == PARAVIRT_LAZY_MMU);
xen_mc_issue(PARAVIRT_LAZY_MMU);
void xen_set_pud(pud_t *ptr, pud_t val)
{
+ ADD_STATS(pud_update, 1);
+
/* If page is not pinned, we can just update the entry
directly */
- if (!page_pinned(ptr)) {
+ if (!xen_page_pinned(ptr)) {
*ptr = val;
return;
}
+ ADD_STATS(pud_update_pinned, 1);
+
xen_set_pud_hyper(ptr, val);
}
void xen_set_pte(pte_t *ptep, pte_t pte)
{
+ ADD_STATS(pte_update, 1);
+// ADD_STATS(pte_update_pinned, xen_page_pinned(ptep));
+ ADD_STATS(pte_update_batched, paravirt_get_lazy_mode() == PARAVIRT_LAZY_MMU);
+
#ifdef CONFIG_X86_PAE
ptep->pte_high = pte.pte_high;
smp_wmb();
u.ptr = virt_to_machine(ptr).maddr;
u.val = pgd_val_ma(val);
- extend_mmu_update(&u);
+ xen_extend_mmu_update(&u);
}
/*
{
pgd_t *user_ptr = xen_get_user_pgd(ptr);
+ ADD_STATS(pgd_update, 1);
+
/* If page is not pinned, we can just update the entry
directly */
- if (!page_pinned(ptr)) {
+ if (!xen_page_pinned(ptr)) {
*ptr = val;
if (user_ptr) {
- WARN_ON(page_pinned(user_ptr));
+ WARN_ON(xen_page_pinned(user_ptr));
*user_ptr = val;
}
return;
}
+ ADD_STATS(pgd_update_pinned, 1);
+ ADD_STATS(pgd_update_batched, paravirt_get_lazy_mode() == PARAVIRT_LAZY_MMU);
+
/* If it's pinned, then we can at least batch the kernel and
user updates together. */
xen_mc_batch();
* For 64-bit, we must skip the Xen hole in the middle of the address
* space, just after the big x86-64 virtual hole.
*/
-static int pgd_walk(pgd_t *pgd, int (*func)(struct page *, enum pt_level),
- unsigned long limit)
+static int xen_pgd_walk(struct mm_struct *mm,
+ int (*func)(struct mm_struct *mm, struct page *,
+ enum pt_level),
+ unsigned long limit)
{
+ pgd_t *pgd = mm->pgd;
int flush = 0;
unsigned hole_low, hole_high;
unsigned pgdidx_limit, pudidx_limit, pmdidx_limit;
pmdidx_limit = 0;
#endif
- flush |= (*func)(virt_to_page(pgd), PT_PGD);
-
for (pgdidx = 0; pgdidx <= pgdidx_limit; pgdidx++) {
pud_t *pud;
pud = pud_offset(&pgd[pgdidx], 0);
if (PTRS_PER_PUD > 1) /* not folded */
- flush |= (*func)(virt_to_page(pud), PT_PUD);
+ flush |= (*func)(mm, virt_to_page(pud), PT_PUD);
for (pudidx = 0; pudidx < PTRS_PER_PUD; pudidx++) {
pmd_t *pmd;
pmd = pmd_offset(&pud[pudidx], 0);
if (PTRS_PER_PMD > 1) /* not folded */
- flush |= (*func)(virt_to_page(pmd), PT_PMD);
+ flush |= (*func)(mm, virt_to_page(pmd), PT_PMD);
for (pmdidx = 0; pmdidx < PTRS_PER_PMD; pmdidx++) {
struct page *pte;
continue;
pte = pmd_page(pmd[pmdidx]);
- flush |= (*func)(pte, PT_PTE);
+ flush |= (*func)(mm, pte, PT_PTE);
}
}
}
+
out:
+ /* Do the top level last, so that the callbacks can use it as
+ a cue to do final things like tlb flushes. */
+ flush |= (*func)(mm, virt_to_page(pgd), PT_PGD);
return flush;
}
-static spinlock_t *lock_pte(struct page *page)
+/* If we're using split pte locks, then take the page's lock and
+ return a pointer to it. Otherwise return NULL. */
+static spinlock_t *xen_pte_lock(struct page *page, struct mm_struct *mm)
{
spinlock_t *ptl = NULL;
-#if NR_CPUS >= CONFIG_SPLIT_PTLOCK_CPUS
+#if USE_SPLIT_PTLOCKS
ptl = __pte_lockptr(page);
- spin_lock(ptl);
+ spin_lock_nest_lock(ptl, &mm->page_table_lock);
#endif
return ptl;
}
-static void do_unlock(void *v)
+static void xen_pte_unlock(void *v)
{
spinlock_t *ptl = v;
spin_unlock(ptl);
MULTI_mmuext_op(mcs.mc, op, 1, NULL, DOMID_SELF);
}
-static int pin_page(struct page *page, enum pt_level level)
+static int xen_pin_page(struct mm_struct *mm, struct page *page,
+ enum pt_level level)
{
unsigned pgfl = TestSetPagePinned(page);
int flush;
flush = 0;
+ /*
+ * We need to hold the pagetable lock between the time
+ * we make the pagetable RO and when we actually pin
+ * it. If we don't, then other users may come in and
+ * attempt to update the pagetable by writing it,
+ * which will fail because the memory is RO but not
+ * pinned, so Xen won't do the trap'n'emulate.
+ *
+ * If we're using split pte locks, we can't hold the
+ * entire pagetable's worth of locks during the
+ * traverse, because we may wrap the preempt count (8
+ * bits). The solution is to mark RO and pin each PTE
+ * page while holding the lock. This means the number
+ * of locks we end up holding is never more than a
+ * batch size (~32 entries, at present).
+ *
+ * If we're not using split pte locks, we needn't pin
+ * the PTE pages independently, because we're
+ * protected by the overall pagetable lock.
+ */
ptl = NULL;
if (level == PT_PTE)
- ptl = lock_pte(page);
+ ptl = xen_pte_lock(page, mm);
MULTI_update_va_mapping(mcs.mc, (unsigned long)pt,
pfn_pte(pfn, PAGE_KERNEL_RO),
level == PT_PGD ? UVMF_TLB_FLUSH : 0);
- if (level == PT_PTE)
+ if (ptl) {
xen_do_pin(MMUEXT_PIN_L1_TABLE, pfn);
- if (ptl) {
/* Queue a deferred unlock for when this batch
is completed. */
- xen_mc_callback(do_unlock, ptl);
+ xen_mc_callback(xen_pte_unlock, ptl);
}
}
/* This is called just after a mm has been created, but it has not
been used yet. We need to make sure that its pagetable is all
read-only, and can be pinned. */
-void xen_pgd_pin(pgd_t *pgd)
+static void __xen_pgd_pin(struct mm_struct *mm, pgd_t *pgd)
{
xen_mc_batch();
- if (pgd_walk(pgd, pin_page, USER_LIMIT)) {
+ if (xen_pgd_walk(mm, xen_pin_page, USER_LIMIT)) {
/* re-enable interrupts for kmap_flush_unused */
xen_mc_issue(0);
kmap_flush_unused();
xen_do_pin(MMUEXT_PIN_L4_TABLE, PFN_DOWN(__pa(pgd)));
if (user_pgd) {
- pin_page(virt_to_page(user_pgd), PT_PGD);
+ xen_pin_page(mm, virt_to_page(user_pgd), PT_PGD);
xen_do_pin(MMUEXT_PIN_L4_TABLE, PFN_DOWN(__pa(user_pgd)));
}
}
#else /* CONFIG_X86_32 */
#ifdef CONFIG_X86_PAE
/* Need to make sure unshared kernel PMD is pinnable */
- pin_page(virt_to_page(pgd_page(pgd[pgd_index(TASK_SIZE)])), PT_PMD);
+ xen_pin_page(mm, virt_to_page(pgd_page(pgd[pgd_index(TASK_SIZE)])),
+ PT_PMD);
#endif
xen_do_pin(MMUEXT_PIN_L3_TABLE, PFN_DOWN(__pa(pgd)));
#endif /* CONFIG_X86_64 */
xen_mc_issue(0);
}
+static void xen_pgd_pin(struct mm_struct *mm)
+{
+ __xen_pgd_pin(mm, mm->pgd);
+}
+
/*
* On save, we need to pin all pagetables to make sure they get their
* mfns turned into pfns. Search the list for any unpinned pgds and pin
* them (unpinned pgds are not currently in use, probably because the
* process is under construction or destruction).
+ *
+ * Expected to be called in stop_machine() ("equivalent to taking
+ * every spinlock in the system"), so the locking doesn't really
+ * matter all that much.
*/
void xen_mm_pin_all(void)
{
list_for_each_entry(page, &pgd_list, lru) {
if (!PagePinned(page)) {
- xen_pgd_pin((pgd_t *)page_address(page));
+ __xen_pgd_pin(&init_mm, (pgd_t *)page_address(page));
SetPageSavePinned(page);
}
}
* that's before we have page structures to store the bits. So do all
* the book-keeping now.
*/
-static __init int mark_pinned(struct page *page, enum pt_level level)
+static __init int xen_mark_pinned(struct mm_struct *mm, struct page *page,
+ enum pt_level level)
{
SetPagePinned(page);
return 0;
void __init xen_mark_init_mm_pinned(void)
{
- pgd_walk(init_mm.pgd, mark_pinned, FIXADDR_TOP);
+ xen_pgd_walk(&init_mm, xen_mark_pinned, FIXADDR_TOP);
}
-static int unpin_page(struct page *page, enum pt_level level)
+static int xen_unpin_page(struct mm_struct *mm, struct page *page,
+ enum pt_level level)
{
unsigned pgfl = TestClearPagePinned(page);
spinlock_t *ptl = NULL;
struct multicall_space mcs;
+ /*
+ * Do the converse to pin_page. If we're using split
+ * pte locks, we must be holding the lock for while
+ * the pte page is unpinned but still RO to prevent
+ * concurrent updates from seeing it in this
+ * partially-pinned state.
+ */
if (level == PT_PTE) {
- ptl = lock_pte(page);
+ ptl = xen_pte_lock(page, mm);
- xen_do_pin(MMUEXT_UNPIN_TABLE, pfn);
+ if (ptl)
+ xen_do_pin(MMUEXT_UNPIN_TABLE, pfn);
}
mcs = __xen_mc_entry(0);
if (ptl) {
/* unlock when batch completed */
- xen_mc_callback(do_unlock, ptl);
+ xen_mc_callback(xen_pte_unlock, ptl);
}
}
}
/* Release a pagetables pages back as normal RW */
-static void xen_pgd_unpin(pgd_t *pgd)
+static void __xen_pgd_unpin(struct mm_struct *mm, pgd_t *pgd)
{
xen_mc_batch();
if (user_pgd) {
xen_do_pin(MMUEXT_UNPIN_TABLE, PFN_DOWN(__pa(user_pgd)));
- unpin_page(virt_to_page(user_pgd), PT_PGD);
+ xen_unpin_page(mm, virt_to_page(user_pgd), PT_PGD);
}
}
#endif
#ifdef CONFIG_X86_PAE
/* Need to make sure unshared kernel PMD is unpinned */
- pin_page(virt_to_page(pgd_page(pgd[pgd_index(TASK_SIZE)])), PT_PMD);
+ xen_unpin_page(mm, virt_to_page(pgd_page(pgd[pgd_index(TASK_SIZE)])),
+ PT_PMD);
#endif
- pgd_walk(pgd, unpin_page, USER_LIMIT);
+ xen_pgd_walk(mm, xen_unpin_page, USER_LIMIT);
xen_mc_issue(0);
}
+static void xen_pgd_unpin(struct mm_struct *mm)
+{
+ __xen_pgd_unpin(mm, mm->pgd);
+}
+
/*
* On resume, undo any pinning done at save, so that the rest of the
* kernel doesn't see any unexpected pinned pagetables.
list_for_each_entry(page, &pgd_list, lru) {
if (PageSavePinned(page)) {
BUG_ON(!PagePinned(page));
- xen_pgd_unpin((pgd_t *)page_address(page));
+ __xen_pgd_unpin(&init_mm, (pgd_t *)page_address(page));
ClearPageSavePinned(page);
}
}
void xen_activate_mm(struct mm_struct *prev, struct mm_struct *next)
{
spin_lock(&next->page_table_lock);
- xen_pgd_pin(next->pgd);
+ xen_pgd_pin(next);
spin_unlock(&next->page_table_lock);
}
void xen_dup_mmap(struct mm_struct *oldmm, struct mm_struct *mm)
{
spin_lock(&mm->page_table_lock);
- xen_pgd_pin(mm->pgd);
+ xen_pgd_pin(mm);
spin_unlock(&mm->page_table_lock);
}
}
}
-static void drop_mm_ref(struct mm_struct *mm)
+static void xen_drop_mm_ref(struct mm_struct *mm)
{
cpumask_t mask;
unsigned cpu;
smp_call_function_mask(mask, drop_other_mm_ref, mm, 1);
}
#else
-static void drop_mm_ref(struct mm_struct *mm)
+static void xen_drop_mm_ref(struct mm_struct *mm)
{
if (current->active_mm == mm)
load_cr3(swapper_pg_dir);
void xen_exit_mmap(struct mm_struct *mm)
{
get_cpu(); /* make sure we don't move around */
- drop_mm_ref(mm);
+ xen_drop_mm_ref(mm);
put_cpu();
spin_lock(&mm->page_table_lock);
/* pgd may not be pinned in the error exit path of execve */
- if (page_pinned(mm->pgd))
- xen_pgd_unpin(mm->pgd);
+ if (xen_page_pinned(mm->pgd))
+ xen_pgd_unpin(mm);
spin_unlock(&mm->page_table_lock);
}
+
+#ifdef CONFIG_XEN_DEBUG_FS
+
+static struct dentry *d_mmu_debug;
+
+static int __init xen_mmu_debugfs(void)
+{
+ struct dentry *d_xen = xen_init_debugfs();
+
+ if (d_xen == NULL)
+ return -ENOMEM;
+
+ d_mmu_debug = debugfs_create_dir("mmu", d_xen);
+
+ debugfs_create_u8("zero_stats", 0644, d_mmu_debug, &zero_stats);
+
+ debugfs_create_u32("pgd_update", 0444, d_mmu_debug, &mmu_stats.pgd_update);
+ debugfs_create_u32("pgd_update_pinned", 0444, d_mmu_debug,
+ &mmu_stats.pgd_update_pinned);
+ debugfs_create_u32("pgd_update_batched", 0444, d_mmu_debug,
+ &mmu_stats.pgd_update_pinned);
+
+ debugfs_create_u32("pud_update", 0444, d_mmu_debug, &mmu_stats.pud_update);
+ debugfs_create_u32("pud_update_pinned", 0444, d_mmu_debug,
+ &mmu_stats.pud_update_pinned);
+ debugfs_create_u32("pud_update_batched", 0444, d_mmu_debug,
+ &mmu_stats.pud_update_pinned);
+
+ debugfs_create_u32("pmd_update", 0444, d_mmu_debug, &mmu_stats.pmd_update);
+ debugfs_create_u32("pmd_update_pinned", 0444, d_mmu_debug,
+ &mmu_stats.pmd_update_pinned);
+ debugfs_create_u32("pmd_update_batched", 0444, d_mmu_debug,
+ &mmu_stats.pmd_update_pinned);
+
+ debugfs_create_u32("pte_update", 0444, d_mmu_debug, &mmu_stats.pte_update);
+// debugfs_create_u32("pte_update_pinned", 0444, d_mmu_debug,
+// &mmu_stats.pte_update_pinned);
+ debugfs_create_u32("pte_update_batched", 0444, d_mmu_debug,
+ &mmu_stats.pte_update_pinned);
+
+ debugfs_create_u32("mmu_update", 0444, d_mmu_debug, &mmu_stats.mmu_update);
+ debugfs_create_u32("mmu_update_extended", 0444, d_mmu_debug,
+ &mmu_stats.mmu_update_extended);
+ xen_debugfs_create_u32_array("mmu_update_histo", 0444, d_mmu_debug,
+ mmu_stats.mmu_update_histo, 20);
+
+ debugfs_create_u32("set_pte_at", 0444, d_mmu_debug, &mmu_stats.set_pte_at);
+ debugfs_create_u32("set_pte_at_batched", 0444, d_mmu_debug,
+ &mmu_stats.set_pte_at_batched);
+ debugfs_create_u32("set_pte_at_current", 0444, d_mmu_debug,
+ &mmu_stats.set_pte_at_current);
+ debugfs_create_u32("set_pte_at_kernel", 0444, d_mmu_debug,
+ &mmu_stats.set_pte_at_kernel);
+
+ debugfs_create_u32("prot_commit", 0444, d_mmu_debug, &mmu_stats.prot_commit);
+ debugfs_create_u32("prot_commit_batched", 0444, d_mmu_debug,
+ &mmu_stats.prot_commit_batched);
+
+ return 0;
+}
+fs_initcall(xen_mmu_debugfs);
+
+#endif /* CONFIG_XEN_DEBUG_FS */
void xen_dup_mmap(struct mm_struct *oldmm, struct mm_struct *mm);
void xen_exit_mmap(struct mm_struct *mm);
-void xen_pgd_pin(pgd_t *pgd);
-//void xen_pgd_unpin(pgd_t *pgd);
-
pteval_t xen_pte_val(pte_t);
pmdval_t xen_pmd_val(pmd_t);
pgdval_t xen_pgd_val(pgd_t);
*/
#include <linux/percpu.h>
#include <linux/hardirq.h>
+#include <linux/debugfs.h>
#include <asm/xen/hypercall.h>
#include "multicalls.h"
+#include "debugfs.h"
+
+#define MC_BATCH 32
#define MC_DEBUG 1
-#define MC_BATCH 32
#define MC_ARGS (MC_BATCH * 16)
+
struct mc_buffer {
struct multicall_entry entries[MC_BATCH];
#if MC_DEBUG
static DEFINE_PER_CPU(struct mc_buffer, mc_buffer);
DEFINE_PER_CPU(unsigned long, xen_mc_irq_flags);
+/* flush reasons 0- slots, 1- args, 2- callbacks */
+enum flush_reasons
+{
+ FL_SLOTS,
+ FL_ARGS,
+ FL_CALLBACKS,
+
+ FL_N_REASONS
+};
+
+#ifdef CONFIG_XEN_DEBUG_FS
+#define NHYPERCALLS 40 /* not really */
+
+static struct {
+ unsigned histo[MC_BATCH+1];
+
+ unsigned issued;
+ unsigned arg_total;
+ unsigned hypercalls;
+ unsigned histo_hypercalls[NHYPERCALLS];
+
+ unsigned flush[FL_N_REASONS];
+} mc_stats;
+
+static u8 zero_stats;
+
+static inline void check_zero(void)
+{
+ if (unlikely(zero_stats)) {
+ memset(&mc_stats, 0, sizeof(mc_stats));
+ zero_stats = 0;
+ }
+}
+
+static void mc_add_stats(const struct mc_buffer *mc)
+{
+ int i;
+
+ check_zero();
+
+ mc_stats.issued++;
+ mc_stats.hypercalls += mc->mcidx;
+ mc_stats.arg_total += mc->argidx;
+
+ mc_stats.histo[mc->mcidx]++;
+ for(i = 0; i < mc->mcidx; i++) {
+ unsigned op = mc->entries[i].op;
+ if (op < NHYPERCALLS)
+ mc_stats.histo_hypercalls[op]++;
+ }
+}
+
+static void mc_stats_flush(enum flush_reasons idx)
+{
+ check_zero();
+
+ mc_stats.flush[idx]++;
+}
+
+#else /* !CONFIG_XEN_DEBUG_FS */
+
+static inline void mc_add_stats(const struct mc_buffer *mc)
+{
+}
+
+static inline void mc_stats_flush(enum flush_reasons idx)
+{
+}
+#endif /* CONFIG_XEN_DEBUG_FS */
+
void xen_mc_flush(void)
{
struct mc_buffer *b = &__get_cpu_var(mc_buffer);
something in the middle */
local_irq_save(flags);
+ mc_add_stats(b);
+
if (b->mcidx) {
#if MC_DEBUG
memcpy(b->debug, b->entries,
if (b->mcidx == MC_BATCH ||
(argidx + args) > MC_ARGS) {
+ mc_stats_flush(b->mcidx == MC_BATCH ? FL_SLOTS : FL_ARGS);
xen_mc_flush();
argidx = roundup(b->argidx, sizeof(u64));
}
struct mc_buffer *b = &__get_cpu_var(mc_buffer);
struct callback *cb;
- if (b->cbidx == MC_BATCH)
+ if (b->cbidx == MC_BATCH) {
+ mc_stats_flush(FL_CALLBACKS);
xen_mc_flush();
+ }
cb = &b->callbacks[b->cbidx++];
cb->fn = fn;
cb->data = data;
}
+
+#ifdef CONFIG_XEN_DEBUG_FS
+
+static struct dentry *d_mc_debug;
+
+static int __init xen_mc_debugfs(void)
+{
+ struct dentry *d_xen = xen_init_debugfs();
+
+ if (d_xen == NULL)
+ return -ENOMEM;
+
+ d_mc_debug = debugfs_create_dir("multicalls", d_xen);
+
+ debugfs_create_u8("zero_stats", 0644, d_mc_debug, &zero_stats);
+
+ debugfs_create_u32("batches", 0444, d_mc_debug, &mc_stats.issued);
+ debugfs_create_u32("hypercalls", 0444, d_mc_debug, &mc_stats.hypercalls);
+ debugfs_create_u32("arg_total", 0444, d_mc_debug, &mc_stats.arg_total);
+
+ xen_debugfs_create_u32_array("batch_histo", 0444, d_mc_debug,
+ mc_stats.histo, MC_BATCH);
+ xen_debugfs_create_u32_array("hypercall_histo", 0444, d_mc_debug,
+ mc_stats.histo_hypercalls, NHYPERCALLS);
+ xen_debugfs_create_u32_array("flush_reasons", 0444, d_mc_debug,
+ mc_stats.flush, FL_N_REASONS);
+
+ return 0;
+}
+fs_initcall(xen_mc_debugfs);
+
+#endif /* CONFIG_XEN_DEBUG_FS */
* useful topology information for the kernel to make use of. As a
* result, all CPUs are treated as if they're single-core and
* single-threaded.
- *
- * This does not handle HOTPLUG_CPU yet.
*/
#include <linux/sched.h>
-#include <linux/kernel_stat.h>
#include <linux/err.h>
#include <linux/smp.h>
#include "xen-ops.h"
#include "mmu.h"
-static void __cpuinit xen_init_lock_cpu(int cpu);
-
cpumask_t xen_cpu_initialized_map;
static DEFINE_PER_CPU(int, resched_irq);
return IRQ_HANDLED;
}
-static __cpuinit void cpu_bringup_and_idle(void)
+static __cpuinit void cpu_bringup(void)
{
int cpu = smp_processor_id();
cpu_init();
+ touch_softlockup_watchdog();
preempt_disable();
xen_enable_sysenter();
local_irq_enable();
wmb(); /* make sure everything is out */
+}
+
+static __cpuinit void cpu_bringup_and_idle(void)
+{
+ cpu_bringup();
cpu_idle();
}
cpu_set(cpu, cpu_present_map);
}
-
- //init_xenbus_allowed_cpumask();
}
static __cpuinit int
struct task_struct *idle = idle_task(cpu);
int rc;
-#if 0
- rc = cpu_up_check(cpu);
- if (rc)
- return rc;
-#endif
-
#ifdef CONFIG_X86_64
/* Allocate node local memory for AP pdas */
WARN_ON(cpu == 0);
{
}
+#ifdef CONFIG_HOTPLUG_CPU
+static int xen_cpu_disable(void)
+{
+ unsigned int cpu = smp_processor_id();
+ if (cpu == 0)
+ return -EBUSY;
+
+ cpu_disable_common();
+
+ load_cr3(swapper_pg_dir);
+ return 0;
+}
+
+static void xen_cpu_die(unsigned int cpu)
+{
+ while (HYPERVISOR_vcpu_op(VCPUOP_is_up, cpu, NULL)) {
+ current->state = TASK_UNINTERRUPTIBLE;
+ schedule_timeout(HZ/10);
+ }
+ unbind_from_irqhandler(per_cpu(resched_irq, cpu), NULL);
+ unbind_from_irqhandler(per_cpu(callfunc_irq, cpu), NULL);
+ unbind_from_irqhandler(per_cpu(debug_irq, cpu), NULL);
+ unbind_from_irqhandler(per_cpu(callfuncsingle_irq, cpu), NULL);
+ xen_uninit_lock_cpu(cpu);
+ xen_teardown_timer(cpu);
+
+ if (num_online_cpus() == 1)
+ alternatives_smp_switch(0);
+}
+
+static void xen_play_dead(void)
+{
+ play_dead_common();
+ HYPERVISOR_vcpu_op(VCPUOP_down, smp_processor_id(), NULL);
+ cpu_bringup();
+}
+
+#else /* !CONFIG_HOTPLUG_CPU */
+static int xen_cpu_disable(void)
+{
+ return -ENOSYS;
+}
+
+static void xen_cpu_die(unsigned int cpu)
+{
+ BUG();
+}
+
+static void xen_play_dead(void)
+{
+ BUG();
+}
+
+#endif
static void stop_self(void *v)
{
int cpu = smp_processor_id();
return IRQ_HANDLED;
}
-struct xen_spinlock {
- unsigned char lock; /* 0 -> free; 1 -> locked */
- unsigned short spinners; /* count of waiting cpus */
-};
-
-static int xen_spin_is_locked(struct raw_spinlock *lock)
-{
- struct xen_spinlock *xl = (struct xen_spinlock *)lock;
-
- return xl->lock != 0;
-}
-
-static int xen_spin_is_contended(struct raw_spinlock *lock)
-{
- struct xen_spinlock *xl = (struct xen_spinlock *)lock;
-
- /* Not strictly true; this is only the count of contended
- lock-takers entering the slow path. */
- return xl->spinners != 0;
-}
-
-static int xen_spin_trylock(struct raw_spinlock *lock)
-{
- struct xen_spinlock *xl = (struct xen_spinlock *)lock;
- u8 old = 1;
-
- asm("xchgb %b0,%1"
- : "+q" (old), "+m" (xl->lock) : : "memory");
-
- return old == 0;
-}
-
-static DEFINE_PER_CPU(int, lock_kicker_irq) = -1;
-static DEFINE_PER_CPU(struct xen_spinlock *, lock_spinners);
-
-static inline void spinning_lock(struct xen_spinlock *xl)
-{
- __get_cpu_var(lock_spinners) = xl;
- wmb(); /* set lock of interest before count */
- asm(LOCK_PREFIX " incw %0"
- : "+m" (xl->spinners) : : "memory");
-}
-
-static inline void unspinning_lock(struct xen_spinlock *xl)
-{
- asm(LOCK_PREFIX " decw %0"
- : "+m" (xl->spinners) : : "memory");
- wmb(); /* decrement count before clearing lock */
- __get_cpu_var(lock_spinners) = NULL;
-}
-
-static noinline int xen_spin_lock_slow(struct raw_spinlock *lock)
-{
- struct xen_spinlock *xl = (struct xen_spinlock *)lock;
- int irq = __get_cpu_var(lock_kicker_irq);
- int ret;
-
- /* If kicker interrupts not initialized yet, just spin */
- if (irq == -1)
- return 0;
-
- /* announce we're spinning */
- spinning_lock(xl);
-
- /* clear pending */
- xen_clear_irq_pending(irq);
-
- /* check again make sure it didn't become free while
- we weren't looking */
- ret = xen_spin_trylock(lock);
- if (ret)
- goto out;
-
- /* block until irq becomes pending */
- xen_poll_irq(irq);
- kstat_this_cpu.irqs[irq]++;
-
-out:
- unspinning_lock(xl);
- return ret;
-}
-
-static void xen_spin_lock(struct raw_spinlock *lock)
-{
- struct xen_spinlock *xl = (struct xen_spinlock *)lock;
- int timeout;
- u8 oldval;
-
- do {
- timeout = 1 << 10;
-
- asm("1: xchgb %1,%0\n"
- " testb %1,%1\n"
- " jz 3f\n"
- "2: rep;nop\n"
- " cmpb $0,%0\n"
- " je 1b\n"
- " dec %2\n"
- " jnz 2b\n"
- "3:\n"
- : "+m" (xl->lock), "=q" (oldval), "+r" (timeout)
- : "1" (1)
- : "memory");
-
- } while (unlikely(oldval != 0 && !xen_spin_lock_slow(lock)));
-}
-
-static noinline void xen_spin_unlock_slow(struct xen_spinlock *xl)
-{
- int cpu;
-
- for_each_online_cpu(cpu) {
- /* XXX should mix up next cpu selection */
- if (per_cpu(lock_spinners, cpu) == xl) {
- xen_send_IPI_one(cpu, XEN_SPIN_UNLOCK_VECTOR);
- break;
- }
- }
-}
-
-static void xen_spin_unlock(struct raw_spinlock *lock)
-{
- struct xen_spinlock *xl = (struct xen_spinlock *)lock;
-
- smp_wmb(); /* make sure no writes get moved after unlock */
- xl->lock = 0; /* release lock */
-
- /* make sure unlock happens before kick */
- barrier();
-
- if (unlikely(xl->spinners))
- xen_spin_unlock_slow(xl);
-}
-
-static __cpuinit void xen_init_lock_cpu(int cpu)
-{
- int irq;
- const char *name;
-
- name = kasprintf(GFP_KERNEL, "spinlock%d", cpu);
- irq = bind_ipi_to_irqhandler(XEN_SPIN_UNLOCK_VECTOR,
- cpu,
- xen_reschedule_interrupt,
- IRQF_DISABLED|IRQF_PERCPU|IRQF_NOBALANCING,
- name,
- NULL);
-
- if (irq >= 0) {
- disable_irq(irq); /* make sure it's never delivered */
- per_cpu(lock_kicker_irq, cpu) = irq;
- }
-
- printk("cpu %d spinlock event irq %d\n", cpu, irq);
-}
-
-static void __init xen_init_spinlocks(void)
-{
- pv_lock_ops.spin_is_locked = xen_spin_is_locked;
- pv_lock_ops.spin_is_contended = xen_spin_is_contended;
- pv_lock_ops.spin_lock = xen_spin_lock;
- pv_lock_ops.spin_trylock = xen_spin_trylock;
- pv_lock_ops.spin_unlock = xen_spin_unlock;
-}
-
static const struct smp_ops xen_smp_ops __initdata = {
.smp_prepare_boot_cpu = xen_smp_prepare_boot_cpu,
.smp_prepare_cpus = xen_smp_prepare_cpus,
- .cpu_up = xen_cpu_up,
.smp_cpus_done = xen_smp_cpus_done,
+ .cpu_up = xen_cpu_up,
+ .cpu_die = xen_cpu_die,
+ .cpu_disable = xen_cpu_disable,
+ .play_dead = xen_play_dead,
+
.smp_send_stop = xen_smp_send_stop,
.smp_send_reschedule = xen_smp_send_reschedule,
--- /dev/null
+/*
+ * Split spinlock implementation out into its own file, so it can be
+ * compiled in a FTRACE-compatible way.
+ */
+#include <linux/kernel_stat.h>
+#include <linux/spinlock.h>
+#include <linux/debugfs.h>
+#include <linux/log2.h>
+
+#include <asm/paravirt.h>
+
+#include <xen/interface/xen.h>
+#include <xen/events.h>
+
+#include "xen-ops.h"
+#include "debugfs.h"
+
+#ifdef CONFIG_XEN_DEBUG_FS
+static struct xen_spinlock_stats
+{
+ u64 taken;
+ u32 taken_slow;
+ u32 taken_slow_nested;
+ u32 taken_slow_pickup;
+ u32 taken_slow_spurious;
+ u32 taken_slow_irqenable;
+
+ u64 released;
+ u32 released_slow;
+ u32 released_slow_kicked;
+
+#define HISTO_BUCKETS 30
+ u32 histo_spin_total[HISTO_BUCKETS+1];
+ u32 histo_spin_spinning[HISTO_BUCKETS+1];
+ u32 histo_spin_blocked[HISTO_BUCKETS+1];
+
+ u64 time_total;
+ u64 time_spinning;
+ u64 time_blocked;
+} spinlock_stats;
+
+static u8 zero_stats;
+
+static unsigned lock_timeout = 1 << 10;
+#define TIMEOUT lock_timeout
+
+static inline void check_zero(void)
+{
+ if (unlikely(zero_stats)) {
+ memset(&spinlock_stats, 0, sizeof(spinlock_stats));
+ zero_stats = 0;
+ }
+}
+
+#define ADD_STATS(elem, val) \
+ do { check_zero(); spinlock_stats.elem += (val); } while(0)
+
+static inline u64 spin_time_start(void)
+{
+ return xen_clocksource_read();
+}
+
+static void __spin_time_accum(u64 delta, u32 *array)
+{
+ unsigned index = ilog2(delta);
+
+ check_zero();
+
+ if (index < HISTO_BUCKETS)
+ array[index]++;
+ else
+ array[HISTO_BUCKETS]++;
+}
+
+static inline void spin_time_accum_spinning(u64 start)
+{
+ u32 delta = xen_clocksource_read() - start;
+
+ __spin_time_accum(delta, spinlock_stats.histo_spin_spinning);
+ spinlock_stats.time_spinning += delta;
+}
+
+static inline void spin_time_accum_total(u64 start)
+{
+ u32 delta = xen_clocksource_read() - start;
+
+ __spin_time_accum(delta, spinlock_stats.histo_spin_total);
+ spinlock_stats.time_total += delta;
+}
+
+static inline void spin_time_accum_blocked(u64 start)
+{
+ u32 delta = xen_clocksource_read() - start;
+
+ __spin_time_accum(delta, spinlock_stats.histo_spin_blocked);
+ spinlock_stats.time_blocked += delta;
+}
+#else /* !CONFIG_XEN_DEBUG_FS */
+#define TIMEOUT (1 << 10)
+#define ADD_STATS(elem, val) do { (void)(val); } while(0)
+
+static inline u64 spin_time_start(void)
+{
+ return 0;
+}
+
+static inline void spin_time_accum_total(u64 start)
+{
+}
+static inline void spin_time_accum_spinning(u64 start)
+{
+}
+static inline void spin_time_accum_blocked(u64 start)
+{
+}
+#endif /* CONFIG_XEN_DEBUG_FS */
+
+struct xen_spinlock {
+ unsigned char lock; /* 0 -> free; 1 -> locked */
+ unsigned short spinners; /* count of waiting cpus */
+};
+
+static int xen_spin_is_locked(struct raw_spinlock *lock)
+{
+ struct xen_spinlock *xl = (struct xen_spinlock *)lock;
+
+ return xl->lock != 0;
+}
+
+static int xen_spin_is_contended(struct raw_spinlock *lock)
+{
+ struct xen_spinlock *xl = (struct xen_spinlock *)lock;
+
+ /* Not strictly true; this is only the count of contended
+ lock-takers entering the slow path. */
+ return xl->spinners != 0;
+}
+
+static int xen_spin_trylock(struct raw_spinlock *lock)
+{
+ struct xen_spinlock *xl = (struct xen_spinlock *)lock;
+ u8 old = 1;
+
+ asm("xchgb %b0,%1"
+ : "+q" (old), "+m" (xl->lock) : : "memory");
+
+ return old == 0;
+}
+
+static DEFINE_PER_CPU(int, lock_kicker_irq) = -1;
+static DEFINE_PER_CPU(struct xen_spinlock *, lock_spinners);
+
+/*
+ * Mark a cpu as interested in a lock. Returns the CPU's previous
+ * lock of interest, in case we got preempted by an interrupt.
+ */
+static inline struct xen_spinlock *spinning_lock(struct xen_spinlock *xl)
+{
+ struct xen_spinlock *prev;
+
+ prev = __get_cpu_var(lock_spinners);
+ __get_cpu_var(lock_spinners) = xl;
+
+ wmb(); /* set lock of interest before count */
+
+ asm(LOCK_PREFIX " incw %0"
+ : "+m" (xl->spinners) : : "memory");
+
+ return prev;
+}
+
+/*
+ * Mark a cpu as no longer interested in a lock. Restores previous
+ * lock of interest (NULL for none).
+ */
+static inline void unspinning_lock(struct xen_spinlock *xl, struct xen_spinlock *prev)
+{
+ asm(LOCK_PREFIX " decw %0"
+ : "+m" (xl->spinners) : : "memory");
+ wmb(); /* decrement count before restoring lock */
+ __get_cpu_var(lock_spinners) = prev;
+}
+
+static noinline int xen_spin_lock_slow(struct raw_spinlock *lock, bool irq_enable)
+{
+ struct xen_spinlock *xl = (struct xen_spinlock *)lock;
+ struct xen_spinlock *prev;
+ int irq = __get_cpu_var(lock_kicker_irq);
+ int ret;
+ unsigned long flags;
+ u64 start;
+
+ /* If kicker interrupts not initialized yet, just spin */
+ if (irq == -1)
+ return 0;
+
+ start = spin_time_start();
+
+ /* announce we're spinning */
+ prev = spinning_lock(xl);
+
+ flags = __raw_local_save_flags();
+ if (irq_enable) {
+ ADD_STATS(taken_slow_irqenable, 1);
+ raw_local_irq_enable();
+ }
+
+ ADD_STATS(taken_slow, 1);
+ ADD_STATS(taken_slow_nested, prev != NULL);
+
+ do {
+ /* clear pending */
+ xen_clear_irq_pending(irq);
+
+ /* check again make sure it didn't become free while
+ we weren't looking */
+ ret = xen_spin_trylock(lock);
+ if (ret) {
+ ADD_STATS(taken_slow_pickup, 1);
+
+ /*
+ * If we interrupted another spinlock while it
+ * was blocking, make sure it doesn't block
+ * without rechecking the lock.
+ */
+ if (prev != NULL)
+ xen_set_irq_pending(irq);
+ goto out;
+ }
+
+ /*
+ * Block until irq becomes pending. If we're
+ * interrupted at this point (after the trylock but
+ * before entering the block), then the nested lock
+ * handler guarantees that the irq will be left
+ * pending if there's any chance the lock became free;
+ * xen_poll_irq() returns immediately if the irq is
+ * pending.
+ */
+ xen_poll_irq(irq);
+ ADD_STATS(taken_slow_spurious, !xen_test_irq_pending(irq));
+ } while (!xen_test_irq_pending(irq)); /* check for spurious wakeups */
+
+ kstat_this_cpu.irqs[irq]++;
+
+out:
+ raw_local_irq_restore(flags);
+ unspinning_lock(xl, prev);
+ spin_time_accum_blocked(start);
+
+ return ret;
+}
+
+static inline void __xen_spin_lock(struct raw_spinlock *lock, bool irq_enable)
+{
+ struct xen_spinlock *xl = (struct xen_spinlock *)lock;
+ unsigned timeout;
+ u8 oldval;
+ u64 start_spin;
+
+ ADD_STATS(taken, 1);
+
+ start_spin = spin_time_start();
+
+ do {
+ u64 start_spin_fast = spin_time_start();
+
+ timeout = TIMEOUT;
+
+ asm("1: xchgb %1,%0\n"
+ " testb %1,%1\n"
+ " jz 3f\n"
+ "2: rep;nop\n"
+ " cmpb $0,%0\n"
+ " je 1b\n"
+ " dec %2\n"
+ " jnz 2b\n"
+ "3:\n"
+ : "+m" (xl->lock), "=q" (oldval), "+r" (timeout)
+ : "1" (1)
+ : "memory");
+
+ spin_time_accum_spinning(start_spin_fast);
+
+ } while (unlikely(oldval != 0 &&
+ (TIMEOUT == ~0 || !xen_spin_lock_slow(lock, irq_enable))));
+
+ spin_time_accum_total(start_spin);
+}
+
+static void xen_spin_lock(struct raw_spinlock *lock)
+{
+ __xen_spin_lock(lock, false);
+}
+
+static void xen_spin_lock_flags(struct raw_spinlock *lock, unsigned long flags)
+{
+ __xen_spin_lock(lock, !raw_irqs_disabled_flags(flags));
+}
+
+static noinline void xen_spin_unlock_slow(struct xen_spinlock *xl)
+{
+ int cpu;
+
+ ADD_STATS(released_slow, 1);
+
+ for_each_online_cpu(cpu) {
+ /* XXX should mix up next cpu selection */
+ if (per_cpu(lock_spinners, cpu) == xl) {
+ ADD_STATS(released_slow_kicked, 1);
+ xen_send_IPI_one(cpu, XEN_SPIN_UNLOCK_VECTOR);
+ break;
+ }
+ }
+}
+
+static void xen_spin_unlock(struct raw_spinlock *lock)
+{
+ struct xen_spinlock *xl = (struct xen_spinlock *)lock;
+
+ ADD_STATS(released, 1);
+
+ smp_wmb(); /* make sure no writes get moved after unlock */
+ xl->lock = 0; /* release lock */
+
+ /* make sure unlock happens before kick */
+ barrier();
+
+ if (unlikely(xl->spinners))
+ xen_spin_unlock_slow(xl);
+}
+
+static irqreturn_t dummy_handler(int irq, void *dev_id)
+{
+ BUG();
+ return IRQ_HANDLED;
+}
+
+void __cpuinit xen_init_lock_cpu(int cpu)
+{
+ int irq;
+ const char *name;
+
+ name = kasprintf(GFP_KERNEL, "spinlock%d", cpu);
+ irq = bind_ipi_to_irqhandler(XEN_SPIN_UNLOCK_VECTOR,
+ cpu,
+ dummy_handler,
+ IRQF_DISABLED|IRQF_PERCPU|IRQF_NOBALANCING,
+ name,
+ NULL);
+
+ if (irq >= 0) {
+ disable_irq(irq); /* make sure it's never delivered */
+ per_cpu(lock_kicker_irq, cpu) = irq;
+ }
+
+ printk("cpu %d spinlock event irq %d\n", cpu, irq);
+}
+
+void xen_uninit_lock_cpu(int cpu)
+{
+ unbind_from_irqhandler(per_cpu(lock_kicker_irq, cpu), NULL);
+}
+
+void __init xen_init_spinlocks(void)
+{
+ pv_lock_ops.spin_is_locked = xen_spin_is_locked;
+ pv_lock_ops.spin_is_contended = xen_spin_is_contended;
+ pv_lock_ops.spin_lock = xen_spin_lock;
+ pv_lock_ops.spin_lock_flags = xen_spin_lock_flags;
+ pv_lock_ops.spin_trylock = xen_spin_trylock;
+ pv_lock_ops.spin_unlock = xen_spin_unlock;
+}
+
+#ifdef CONFIG_XEN_DEBUG_FS
+
+static struct dentry *d_spin_debug;
+
+static int __init xen_spinlock_debugfs(void)
+{
+ struct dentry *d_xen = xen_init_debugfs();
+
+ if (d_xen == NULL)
+ return -ENOMEM;
+
+ d_spin_debug = debugfs_create_dir("spinlocks", d_xen);
+
+ debugfs_create_u8("zero_stats", 0644, d_spin_debug, &zero_stats);
+
+ debugfs_create_u32("timeout", 0644, d_spin_debug, &lock_timeout);
+
+ debugfs_create_u64("taken", 0444, d_spin_debug, &spinlock_stats.taken);
+ debugfs_create_u32("taken_slow", 0444, d_spin_debug,
+ &spinlock_stats.taken_slow);
+ debugfs_create_u32("taken_slow_nested", 0444, d_spin_debug,
+ &spinlock_stats.taken_slow_nested);
+ debugfs_create_u32("taken_slow_pickup", 0444, d_spin_debug,
+ &spinlock_stats.taken_slow_pickup);
+ debugfs_create_u32("taken_slow_spurious", 0444, d_spin_debug,
+ &spinlock_stats.taken_slow_spurious);
+ debugfs_create_u32("taken_slow_irqenable", 0444, d_spin_debug,
+ &spinlock_stats.taken_slow_irqenable);
+
+ debugfs_create_u64("released", 0444, d_spin_debug, &spinlock_stats.released);
+ debugfs_create_u32("released_slow", 0444, d_spin_debug,
+ &spinlock_stats.released_slow);
+ debugfs_create_u32("released_slow_kicked", 0444, d_spin_debug,
+ &spinlock_stats.released_slow_kicked);
+
+ debugfs_create_u64("time_spinning", 0444, d_spin_debug,
+ &spinlock_stats.time_spinning);
+ debugfs_create_u64("time_blocked", 0444, d_spin_debug,
+ &spinlock_stats.time_blocked);
+ debugfs_create_u64("time_total", 0444, d_spin_debug,
+ &spinlock_stats.time_total);
+
+ xen_debugfs_create_u32_array("histo_total", 0444, d_spin_debug,
+ spinlock_stats.histo_spin_total, HISTO_BUCKETS + 1);
+ xen_debugfs_create_u32_array("histo_spinning", 0444, d_spin_debug,
+ spinlock_stats.histo_spin_spinning, HISTO_BUCKETS + 1);
+ xen_debugfs_create_u32_array("histo_blocked", 0444, d_spin_debug,
+ spinlock_stats.histo_spin_blocked, HISTO_BUCKETS + 1);
+
+ return 0;
+}
+fs_initcall(xen_spinlock_debugfs);
+
+#endif /* CONFIG_XEN_DEBUG_FS */
#define TIMER_SLOP 100000
#define NS_PER_TICK (1000000000LL / HZ)
-static cycle_t xen_clocksource_read(void);
-
/* runstate info updated by Xen */
static DEFINE_PER_CPU(struct vcpu_runstate_info, runstate);
return xen_khz;
}
-static cycle_t xen_clocksource_read(void)
+cycle_t xen_clocksource_read(void)
{
struct pvclock_vcpu_time_info *src;
cycle_t ret;
setup_runstate_info(cpu);
}
+void xen_teardown_timer(int cpu)
+{
+ struct clock_event_device *evt;
+ BUG_ON(cpu == 0);
+ evt = &per_cpu(xen_clock_events, cpu);
+ unbind_from_irqhandler(evt->irq, NULL);
+}
+
void xen_setup_cpu_clockevents(void)
{
BUG_ON(preemptible());
push %eax
push %ecx
push %edx
- call force_evtchn_callback
+ call xen_force_evtchn_callback
pop %edx
pop %ecx
pop %eax
/* Pseudo-flag used for virtual NMI, which we don't implement yet */
#define XEN_EFLAGS_NMI 0x80000000
-#if 0
-#include <asm/percpu.h>
+#if 1
+/*
+ x86-64 does not yet support direct access to percpu variables
+ via a segment override, so we just need to make sure this code
+ never gets used
+ */
+#define BUG ud2a
+#define PER_CPU_VAR(var, off) 0xdeadbeef
+#endif
/*
Enable events. This clears the event mask and tests the pending
events, then enter the hypervisor to get them handled.
*/
ENTRY(xen_irq_enable_direct)
+ BUG
+
/* Unmask events */
movb $0, PER_CPU_VAR(xen_vcpu_info, XEN_vcpu_info_mask)
non-zero.
*/
ENTRY(xen_irq_disable_direct)
+ BUG
+
movb $1, PER_CPU_VAR(xen_vcpu_info, XEN_vcpu_info_mask)
ENDPATCH(xen_irq_disable_direct)
ret
Xen and x86 use opposite senses (mask vs enable).
*/
ENTRY(xen_save_fl_direct)
+ BUG
+
testb $0xff, PER_CPU_VAR(xen_vcpu_info, XEN_vcpu_info_mask)
setz %ah
addb %ah,%ah
if so.
*/
ENTRY(xen_restore_fl_direct)
+ BUG
+
testb $X86_EFLAGS_IF>>8, %ah
setz PER_CPU_VAR(xen_vcpu_info, XEN_vcpu_info_mask)
/* Preempt here doesn't matter because that will deal with
push %r9
push %r10
push %r11
- call force_evtchn_callback
+ call xen_force_evtchn_callback
pop %r11
pop %r10
pop %r9
pop %rcx
pop %rax
ret
-#endif
ENTRY(xen_adjust_exception_frame)
mov 8+0(%rsp),%rcx
#define XEN_OPS_H
#include <linux/init.h>
+#include <linux/clocksource.h>
#include <linux/irqreturn.h>
#include <xen/xen-ops.h>
void __init xen_build_dynamic_phys_to_machine(void);
+void xen_init_irq_ops(void);
void xen_setup_timer(int cpu);
+void xen_teardown_timer(int cpu);
+cycle_t xen_clocksource_read(void);
void xen_setup_cpu_clockevents(void);
unsigned long xen_tsc_khz(void);
void __init xen_time_init(void);
#ifdef CONFIG_SMP
void xen_smp_init(void);
+void __init xen_init_spinlocks(void);
+__cpuinit void xen_init_lock_cpu(int cpu);
+void xen_uninit_lock_cpu(int cpu);
+
extern cpumask_t xen_cpu_initialized_map;
#else
static inline void xen_smp_init(void) {}
static int __init xlblk_init(void)
{
- if (!is_running_on_xen())
+ if (!xen_domain())
return -ENODEV;
if (register_blkdev(XENVBD_MAJOR, DEV_NAME)) {
{
struct hvc_struct *hp;
- if (!is_running_on_xen() ||
- is_initial_xendomain() ||
+ if (!xen_pv_domain() ||
+ xen_initial_domain() ||
!xen_start_info->console.domU.evtchn)
return -ENODEV;
static int xen_cons_init(void)
{
- if (!is_running_on_xen())
+ if (!xen_pv_domain())
return 0;
hvc_instantiate(HVC_COOKIE, 0, &hvc_ops);
static int __init xenkbd_init(void)
{
- if (!is_running_on_xen())
+ if (!xen_domain())
return -ENODEV;
/* Nothing to do if running in dom0. */
- if (is_initial_xendomain())
+ if (xen_initial_domain())
return -ENODEV;
return xenbus_register_frontend(&xenkbd);
static int __init netif_init(void)
{
- if (!is_running_on_xen())
+ if (!xen_domain())
return -ENODEV;
- if (is_initial_xendomain())
+ if (xen_initial_domain())
return 0;
printk(KERN_INFO "Initialising Xen virtual ethernet driver.\n");
static void __exit netif_exit(void)
{
- if (is_initial_xendomain())
+ if (xen_initial_domain())
return;
xenbus_unregister_driver(&netfront);
static int __init xenfb_init(void)
{
- if (!is_running_on_xen())
+ if (!xen_domain())
return -ENODEV;
/* Nothing to do if running in dom0. */
- if (is_initial_xendomain())
+ if (xen_initial_domain())
return -ENODEV;
return xenbus_register_frontend(&xenfb);
obj-y += grant-table.o features.o events.o manage.o
obj-y += xenbus/
+obj-$(CONFIG_HOTPLUG_CPU) += cpu_hotplug.o
obj-$(CONFIG_XEN_XENCOMM) += xencomm.o
obj-$(CONFIG_XEN_BALLOON) += balloon.o
#include <asm/tlb.h>
#include <xen/interface/memory.h>
-#include <xen/balloon.h>
#include <xen/xenbus.h>
#include <xen/features.h>
#include <xen/page.h>
}
set_xen_guest_handle(reservation.extent_start, frame_list);
- reservation.nr_extents = nr_pages;
- rc = HYPERVISOR_memory_op(
- XENMEM_populate_physmap, &reservation);
+ reservation.nr_extents = nr_pages;
+ rc = HYPERVISOR_memory_op(XENMEM_populate_physmap, &reservation);
if (rc < nr_pages) {
if (rc > 0) {
int ret;
/* We hit the Xen hard limit: reprobe. */
reservation.nr_extents = rc;
ret = HYPERVISOR_memory_op(XENMEM_decrease_reservation,
- &reservation);
+ &reservation);
BUG_ON(ret != rc);
}
if (rc >= 0)
unsigned long pfn;
struct page *page;
- if (!is_running_on_xen())
+ if (!xen_pv_domain())
return -ENODEV;
pr_info("xen_balloon: Initialising balloon driver.\n");
module_exit(balloon_exit);
-static void balloon_update_driver_allowance(long delta)
-{
- unsigned long flags;
-
- spin_lock_irqsave(&balloon_lock, flags);
- balloon_stats.driver_pages += delta;
- spin_unlock_irqrestore(&balloon_lock, flags);
-}
-
-static int dealloc_pte_fn(
- pte_t *pte, struct page *pmd_page, unsigned long addr, void *data)
-{
- unsigned long mfn = pte_mfn(*pte);
- int ret;
- struct xen_memory_reservation reservation = {
- .nr_extents = 1,
- .extent_order = 0,
- .domid = DOMID_SELF
- };
- set_xen_guest_handle(reservation.extent_start, &mfn);
- set_pte_at(&init_mm, addr, pte, __pte_ma(0ull));
- set_phys_to_machine(__pa(addr) >> PAGE_SHIFT, INVALID_P2M_ENTRY);
- ret = HYPERVISOR_memory_op(XENMEM_decrease_reservation, &reservation);
- BUG_ON(ret != 1);
- return 0;
-}
-
-static struct page **alloc_empty_pages_and_pagevec(int nr_pages)
-{
- unsigned long vaddr, flags;
- struct page *page, **pagevec;
- int i, ret;
-
- pagevec = kmalloc(sizeof(page) * nr_pages, GFP_KERNEL);
- if (pagevec == NULL)
- return NULL;
-
- for (i = 0; i < nr_pages; i++) {
- page = pagevec[i] = alloc_page(GFP_KERNEL);
- if (page == NULL)
- goto err;
-
- vaddr = (unsigned long)page_address(page);
-
- scrub_page(page);
-
- spin_lock_irqsave(&balloon_lock, flags);
-
- if (xen_feature(XENFEAT_auto_translated_physmap)) {
- unsigned long gmfn = page_to_pfn(page);
- struct xen_memory_reservation reservation = {
- .nr_extents = 1,
- .extent_order = 0,
- .domid = DOMID_SELF
- };
- set_xen_guest_handle(reservation.extent_start, &gmfn);
- ret = HYPERVISOR_memory_op(XENMEM_decrease_reservation,
- &reservation);
- if (ret == 1)
- ret = 0; /* success */
- } else {
- ret = apply_to_page_range(&init_mm, vaddr, PAGE_SIZE,
- dealloc_pte_fn, NULL);
- }
-
- if (ret != 0) {
- spin_unlock_irqrestore(&balloon_lock, flags);
- __free_page(page);
- goto err;
- }
-
- totalram_pages = --balloon_stats.current_pages;
-
- spin_unlock_irqrestore(&balloon_lock, flags);
- }
-
- out:
- schedule_work(&balloon_worker);
- flush_tlb_all();
- return pagevec;
-
- err:
- spin_lock_irqsave(&balloon_lock, flags);
- while (--i >= 0)
- balloon_append(pagevec[i]);
- spin_unlock_irqrestore(&balloon_lock, flags);
- kfree(pagevec);
- pagevec = NULL;
- goto out;
-}
-
-static void free_empty_pages_and_pagevec(struct page **pagevec, int nr_pages)
-{
- unsigned long flags;
- int i;
-
- if (pagevec == NULL)
- return;
-
- spin_lock_irqsave(&balloon_lock, flags);
- for (i = 0; i < nr_pages; i++) {
- BUG_ON(page_count(pagevec[i]) != 1);
- balloon_append(pagevec[i]);
- }
- spin_unlock_irqrestore(&balloon_lock, flags);
-
- kfree(pagevec);
-
- schedule_work(&balloon_worker);
-}
-
-static void balloon_release_driver_page(struct page *page)
-{
- unsigned long flags;
-
- spin_lock_irqsave(&balloon_lock, flags);
- balloon_append(page);
- balloon_stats.driver_pages--;
- spin_unlock_irqrestore(&balloon_lock, flags);
-
- schedule_work(&balloon_worker);
-}
-
-
-#define BALLOON_SHOW(name, format, args...) \
- static ssize_t show_##name(struct sys_device *dev, \
- char *buf) \
- { \
- return sprintf(buf, format, ##args); \
- } \
+#define BALLOON_SHOW(name, format, args...) \
+ static ssize_t show_##name(struct sys_device *dev, \
+ struct sysdev_attribute *attr, \
+ char *buf) \
+ { \
+ return sprintf(buf, format, ##args); \
+ } \
static SYSDEV_ATTR(name, S_IRUGO, show_##name, NULL)
BALLOON_SHOW(current_kb, "%lu\n", PAGES2KB(balloon_stats.current_pages));
(balloon_stats.hard_limit!=~0UL) ? PAGES2KB(balloon_stats.hard_limit) : 0);
BALLOON_SHOW(driver_kb, "%lu\n", PAGES2KB(balloon_stats.driver_pages));
-static ssize_t show_target_kb(struct sys_device *dev, char *buf)
+static ssize_t show_target_kb(struct sys_device *dev, struct sysdev_attribute *attr,
+ char *buf)
{
return sprintf(buf, "%lu\n", PAGES2KB(balloon_stats.target_pages));
}
const char *buf,
size_t count)
{
- char memstring[64], *endchar;
+ char *endchar;
unsigned long long target_bytes;
if (!capable(CAP_SYS_ADMIN))
return -EPERM;
- if (count <= 1)
- return -EBADMSG; /* runt */
- if (count > sizeof(memstring))
- return -EFBIG; /* too long */
- strcpy(memstring, buf);
+ target_bytes = memparse(buf, &endchar);
- target_bytes = memparse(memstring, &endchar);
balloon_set_new_target(target_bytes >> PAGE_SHIFT);
return count;
return error;
}
-static void unregister_balloon(struct sys_device *sysdev)
-{
- int i;
-
- sysfs_remove_group(&sysdev->kobj, &balloon_info_group);
- for (i = 0; i < ARRAY_SIZE(balloon_attrs); i++)
- sysdev_remove_file(sysdev, balloon_attrs[i]);
- sysdev_unregister(sysdev);
- sysdev_class_unregister(&balloon_sysdev_class);
-}
-
-static void balloon_sysfs_exit(void)
-{
- unregister_balloon(&balloon_sysdev);
-}
-
MODULE_LICENSE("GPL");
--- /dev/null
+#include <linux/notifier.h>
+
+#include <xen/xenbus.h>
+
+#include <asm-x86/xen/hypervisor.h>
+#include <asm/cpu.h>
+
+static void enable_hotplug_cpu(int cpu)
+{
+ if (!cpu_present(cpu))
+ arch_register_cpu(cpu);
+
+ cpu_set(cpu, cpu_present_map);
+}
+
+static void disable_hotplug_cpu(int cpu)
+{
+ if (cpu_present(cpu))
+ arch_unregister_cpu(cpu);
+
+ cpu_clear(cpu, cpu_present_map);
+}
+
+static void vcpu_hotplug(unsigned int cpu)
+{
+ int err;
+ char dir[32], state[32];
+
+ if (!cpu_possible(cpu))
+ return;
+
+ sprintf(dir, "cpu/%u", cpu);
+ err = xenbus_scanf(XBT_NIL, dir, "availability", "%s", state);
+ if (err != 1) {
+ printk(KERN_ERR "XENBUS: Unable to read cpu state\n");
+ return;
+ }
+
+ if (strcmp(state, "online") == 0) {
+ enable_hotplug_cpu(cpu);
+ } else if (strcmp(state, "offline") == 0) {
+ (void)cpu_down(cpu);
+ disable_hotplug_cpu(cpu);
+ } else {
+ printk(KERN_ERR "XENBUS: unknown state(%s) on CPU%d\n",
+ state, cpu);
+ }
+}
+
+static void handle_vcpu_hotplug_event(struct xenbus_watch *watch,
+ const char **vec, unsigned int len)
+{
+ unsigned int cpu;
+ char *cpustr;
+ const char *node = vec[XS_WATCH_PATH];
+
+ cpustr = strstr(node, "cpu/");
+ if (cpustr != NULL) {
+ sscanf(cpustr, "cpu/%u", &cpu);
+ vcpu_hotplug(cpu);
+ }
+}
+
+static int setup_cpu_watcher(struct notifier_block *notifier,
+ unsigned long event, void *data)
+{
+ static struct xenbus_watch cpu_watch = {
+ .node = "cpu",
+ .callback = handle_vcpu_hotplug_event};
+
+ (void)register_xenbus_watch(&cpu_watch);
+
+ return NOTIFY_DONE;
+}
+
+static int __init setup_vcpu_hotplug_event(void)
+{
+ static struct notifier_block xsn_cpu = {
+ .notifier_call = setup_cpu_watcher };
+
+ if (!xen_pv_domain())
+ return -ENODEV;
+
+ register_xenstore_notifier(&xsn_cpu);
+
+ return 0;
+}
+
+arch_initcall(setup_vcpu_hotplug_event);
+
/* Xen will never allocate port zero for any purpose. */
#define VALID_EVTCHN(chn) ((chn) != 0)
-/*
- * Force a proper event-channel callback from Xen after clearing the
- * callback mask. We do this in a very simple manner, by making a call
- * down into Xen. The pending flag will be checked by Xen on return.
- */
-void force_evtchn_callback(void)
-{
- (void)HYPERVISOR_xen_version(0, NULL);
-}
-EXPORT_SYMBOL_GPL(force_evtchn_callback);
-
static struct irq_chip xen_dynamic_chip;
/* Constructor for packed IRQ information. */
sync_set_bit(port, &s->evtchn_pending[0]);
}
+static inline int test_evtchn(int port)
+{
+ struct shared_info *s = HYPERVISOR_shared_info;
+ return sync_test_bit(port, &s->evtchn_pending[0]);
+}
+
/**
* notify_remote_via_irq - send event to remote end of event channel via irq
per_cpu(virq_to_irq, cpu_from_evtchn(evtchn))
[index_from_irq(irq)] = -1;
break;
+ case IRQT_IPI:
+ per_cpu(ipi_to_irq, cpu_from_evtchn(evtchn))
+ [index_from_irq(irq)] = -1;
+ break;
default:
break;
}
clear_evtchn(evtchn);
}
+void xen_set_irq_pending(int irq)
+{
+ int evtchn = evtchn_from_irq(irq);
+
+ if (VALID_EVTCHN(evtchn))
+ set_evtchn(evtchn);
+}
+
+bool xen_test_irq_pending(int irq)
+{
+ int evtchn = evtchn_from_irq(irq);
+ bool ret = false;
+
+ if (VALID_EVTCHN(evtchn))
+ ret = test_evtchn(evtchn);
+
+ return ret;
+}
+
/* Poll waiting for an irq to become pending. In the usual case, the
irq will be disabled so it won't deliver an interrupt. */
void xen_poll_irq(int irq)
unsigned int max_nr_glist_frames, nr_glist_frames;
unsigned int nr_init_grefs;
- if (!is_running_on_xen())
+ if (!xen_domain())
return -ENODEV;
nr_grant_frames = 1;
DPRINTK("");
err = -ENODEV;
- if (!is_running_on_xen())
+ if (!xen_domain())
goto out_error;
/* Register ourselves with the kernel bus subsystem */
/*
* Domain0 doesn't have a store_evtchn or store_mfn yet.
*/
- if (is_initial_xendomain()) {
+ if (xen_initial_domain()) {
/* dom0 not yet supported */
} else {
xenstored_ready = 1;
goto out_unreg_back;
}
- if (!is_initial_xendomain())
+ if (!xen_initial_domain())
xenbus_probe(NULL);
return 0;
unsigned long timeout = jiffies + 10*HZ;
struct device_driver *drv = xendrv ? &xendrv->driver : NULL;
- if (!ready_to_wait_for_devices || !is_running_on_xen())
+ if (!ready_to_wait_for_devices || !xen_domain())
return;
while (exists_disconnected_device(drv)) {
*/
#define TRAP_BRKPT (__SI_FAULT|1) /* process breakpoint */
#define TRAP_TRACE (__SI_FAULT|2) /* process trace trap */
+#define TRAP_BRANCH (__SI_FAULT|3) /* process taken branch trap */
+#define TRAP_HWBKPT (__SI_FAULT|4) /* hardware breakpoint/watchpoint */
#define NSIGTRAP 2
/*
#include <asm-generic/siginfo.h>
-/*
- * SIGTRAP si_codes
- */
-#define TRAP_BRANCH (__SI_FAULT|3) /* process taken branch trap */
-#define TRAP_HWBKPT (__SI_FAULT|4) /* hardware breakpoint or watchpoint */
#undef NSIGTRAP
#define NSIGTRAP 4
desc->d = info->seg_32bit;
desc->g = info->limit_in_pages;
desc->base2 = (info->base_addr & 0xff000000) >> 24;
+ /*
+ * Don't allow setting of the lm bit. It is useless anyway
+ * because 64bit system calls require __USER_CS:
+ */
+ desc->l = 0;
}
extern struct desc_ptr idt_descr;
native_write_gdt_entry(dt, entry, desc, type)
#define write_idt_entry(dt, entry, g) \
native_write_idt_entry(dt, entry, g)
-#endif
+
+static inline void paravirt_alloc_ldt(struct desc_struct *ldt, unsigned entries)
+{
+}
+
+static inline void paravirt_free_ldt(struct desc_struct *ldt, unsigned entries)
+{
+}
+#endif /* CONFIG_PARAVIRT */
static inline void native_write_idt_entry(gate_desc *idt, int entry,
const gate_desc *gate)
int entrynum, const void *desc, int size);
void (*write_idt_entry)(gate_desc *,
int entrynum, const gate_desc *gate);
+ void (*alloc_ldt)(struct desc_struct *ldt, unsigned entries);
+ void (*free_ldt)(struct desc_struct *ldt, unsigned entries);
+
void (*load_sp0)(struct tss_struct *tss, struct thread_struct *t);
void (*set_iopl_mask)(unsigned mask);
int (*spin_is_locked)(struct raw_spinlock *lock);
int (*spin_is_contended)(struct raw_spinlock *lock);
void (*spin_lock)(struct raw_spinlock *lock);
+ void (*spin_lock_flags)(struct raw_spinlock *lock, unsigned long flags);
int (*spin_trylock)(struct raw_spinlock *lock);
void (*spin_unlock)(struct raw_spinlock *lock);
};
(aux) = __aux; \
} while (0)
+static inline void paravirt_alloc_ldt(struct desc_struct *ldt, unsigned entries)
+{
+ PVOP_VCALL2(pv_cpu_ops.alloc_ldt, ldt, entries);
+}
+
+static inline void paravirt_free_ldt(struct desc_struct *ldt, unsigned entries)
+{
+ PVOP_VCALL2(pv_cpu_ops.free_ldt, ldt, entries);
+}
+
static inline void load_TR_desc(void)
{
PVOP_VCALL0(pv_cpu_ops.load_tr_desc);
PVOP_VCALL1(pv_lock_ops.spin_lock, lock);
}
+static __always_inline void __raw_spin_lock_flags(struct raw_spinlock *lock,
+ unsigned long flags)
+{
+ PVOP_VCALL2(pv_lock_ops.spin_lock_flags, lock, flags);
+}
+
static __always_inline int __raw_spin_trylock(struct raw_spinlock *lock)
{
return PVOP_CALL1(int, pv_lock_ops.spin_trylock, lock);
#ifdef CONFIG_X86_32
extern void send_sigtrap(struct task_struct *tsk, struct pt_regs *regs,
- int error_code);
-#else
-void signal_fault(struct pt_regs *regs, void __user *frame, char *where);
+ int error_code, int si_code);
#endif
+void signal_fault(struct pt_regs *regs, void __user *frame, char *where);
+
extern long syscall_trace_enter(struct pt_regs *);
extern void syscall_trace_leave(struct pt_regs *);
struct smp_ops {
void (*smp_prepare_boot_cpu)(void);
void (*smp_prepare_cpus)(unsigned max_cpus);
- int (*cpu_up)(unsigned cpu);
void (*smp_cpus_done)(unsigned max_cpus);
void (*smp_send_stop)(void);
void (*smp_send_reschedule)(int cpu);
+ int (*cpu_up)(unsigned cpu);
+ int (*cpu_disable)(void);
+ void (*cpu_die)(unsigned int cpu);
+ void (*play_dead)(void);
+
void (*send_call_func_ipi)(cpumask_t mask);
void (*send_call_func_single_ipi)(int cpu);
};
return smp_ops.cpu_up(cpu);
}
+static inline int __cpu_disable(void)
+{
+ return smp_ops.cpu_disable();
+}
+
+static inline void __cpu_die(unsigned int cpu)
+{
+ smp_ops.cpu_die(cpu);
+}
+
+static inline void play_dead(void)
+{
+ smp_ops.play_dead();
+}
+
static inline void smp_send_reschedule(int cpu)
{
smp_ops.smp_send_reschedule(cpu);
smp_ops.send_call_func_ipi(mask);
}
+void cpu_disable_common(void);
void native_smp_prepare_boot_cpu(void);
void native_smp_prepare_cpus(unsigned int max_cpus);
void native_smp_cpus_done(unsigned int max_cpus);
int native_cpu_up(unsigned int cpunum);
+int native_cpu_disable(void);
+void native_cpu_die(unsigned int cpu);
+void native_play_dead(void);
+void play_dead_common(void);
+
void native_send_call_func_ipi(cpumask_t mask);
void native_send_call_func_single_ipi(int cpu);
-extern int __cpu_disable(void);
-extern void __cpu_die(unsigned int cpu);
-
void smp_store_cpu_info(int id);
#define cpu_physical_id(cpu) per_cpu(x86_cpu_to_apicid, cpu)
#endif /* CONFIG_X86_LOCAL_APIC */
-#ifdef CONFIG_HOTPLUG_CPU
-extern void cpu_uninit(void);
-#endif
-
#endif /* __ASSEMBLY__ */
#endif /* ASM_X86__SMP_H */
return (((tmp >> TICKET_SHIFT) - tmp) & ((1 << TICKET_SHIFT) - 1)) > 1;
}
-#define __raw_spin_lock_flags(lock, flags) __raw_spin_lock(lock)
-
#ifdef CONFIG_PARAVIRT
/*
* Define virtualization-friendly old-style lock byte lock, for use in
{
__ticket_spin_unlock(lock);
}
+
+static __always_inline void __raw_spin_lock_flags(raw_spinlock_t *lock,
+ unsigned long flags)
+{
+ __raw_spin_lock(lock);
+}
+
#endif /* CONFIG_PARAVIRT */
static inline void __raw_spin_unlock_wait(raw_spinlock_t *lock)
{
}
+static inline void reset_lazy_tlbstate(void)
+{
+}
+
#else /* SMP */
#include <asm/smp.h>
char __cacheline_padding[L1_CACHE_BYTES-8];
};
DECLARE_PER_CPU(struct tlb_state, cpu_tlbstate);
+
+void reset_lazy_tlbstate(void);
+#else
+static inline void reset_lazy_tlbstate(void)
+{
+}
#endif
#endif /* SMP */
#ifndef ASM_X86__TRAPS_H
#define ASM_X86__TRAPS_H
+#include <asm/debugreg.h>
+
/* Common in X86_32 and X86_64 */
asmlinkage void divide_error(void);
asmlinkage void debug(void);
void do_general_protection(struct pt_regs *, long);
void do_nmi(struct pt_regs *, long);
+static inline int get_si_code(unsigned long condition)
+{
+ if (condition & DR_STEP)
+ return TRAP_TRACE;
+ else if (condition & (DR_TRAP0|DR_TRAP1|DR_TRAP2|DR_TRAP3))
+ return TRAP_HWBKPT;
+ else
+ return TRAP_BRKPT;
+}
+
extern int panic_on_unrecovered_nmi;
extern int kstack_depth_to_print;
/* arch/i386/kernel/setup.c */
extern struct shared_info *HYPERVISOR_shared_info;
extern struct start_info *xen_start_info;
-#define is_initial_xendomain() (xen_start_info->flags & SIF_INITDOMAIN)
/* arch/i386/mach-xen/evtchn.c */
/* Force a proper event-channel callback from Xen. */
#define MULTI_UVMFLAGS_INDEX 3
#define MULTI_UVMDOMID_INDEX 4
-#define is_running_on_xen() (xen_start_info ? 1 : 0)
+enum xen_domain_type {
+ XEN_NATIVE,
+ XEN_PV_DOMAIN,
+ XEN_HVM_DOMAIN,
+};
+
+extern enum xen_domain_type xen_domain_type;
+
+#define xen_domain() (xen_domain_type != XEN_NATIVE)
+#define xen_pv_domain() (xen_domain_type == XEN_PV_DOMAIN)
+#define xen_initial_domain() (xen_pv_domain() && xen_start_info->flags & SIF_INITDOMAIN)
+#define xen_hvm_domain() (xen_domain_type == XEN_HVM_DOMAIN)
#endif /* ASM_X86__XEN__HYPERVISOR_H */
extern int get_option(char **str, int *pint);
extern char *get_options(const char *str, int nints, int *ints);
-extern unsigned long long memparse(char *ptr, char **retptr);
+extern unsigned long long memparse(const char *ptr, char **retptr);
extern int core_kernel_text(unsigned long addr);
extern int __kernel_text_address(unsigned long addr);
}
#endif /* CONFIG_MMU && !__ARCH_HAS_4LEVEL_HACK */
-#if NR_CPUS >= CONFIG_SPLIT_PTLOCK_CPUS
+#if USE_SPLIT_PTLOCKS
/*
* We tuck a spinlock to guard each pagetable page into its struct page,
* at page->private, with BUILD_BUG_ON to make sure that this will not
} while (0)
#define pte_lock_deinit(page) ((page)->mapping = NULL)
#define pte_lockptr(mm, pmd) ({(void)(mm); __pte_lockptr(pmd_page(*(pmd)));})
-#else
+#else /* !USE_SPLIT_PTLOCKS */
/*
* We use mm->page_table_lock to guard all pagetable pages of the mm.
*/
#define pte_lock_init(page) do {} while (0)
#define pte_lock_deinit(page) do {} while (0)
#define pte_lockptr(mm, pmd) ({(void)(pmd); &(mm)->page_table_lock;})
-#endif /* NR_CPUS < CONFIG_SPLIT_PTLOCK_CPUS */
+#endif /* USE_SPLIT_PTLOCKS */
static inline void pgtable_page_ctor(struct page *page)
{
struct address_space;
-#if NR_CPUS >= CONFIG_SPLIT_PTLOCK_CPUS
+#define USE_SPLIT_PTLOCKS (NR_CPUS >= CONFIG_SPLIT_PTLOCK_CPUS)
+
+#if USE_SPLIT_PTLOCKS
typedef atomic_long_t mm_counter_t;
-#else /* NR_CPUS < CONFIG_SPLIT_PTLOCK_CPUS */
+#else /* !USE_SPLIT_PTLOCKS */
typedef unsigned long mm_counter_t;
-#endif /* NR_CPUS < CONFIG_SPLIT_PTLOCK_CPUS */
+#endif /* !USE_SPLIT_PTLOCKS */
/*
* Each physical page in the system has a struct page associated with
* see PAGE_MAPPING_ANON below.
*/
};
-#if NR_CPUS >= CONFIG_SPLIT_PTLOCK_CPUS
+#if USE_SPLIT_PTLOCKS
spinlock_t ptl;
#endif
struct kmem_cache *slab; /* SLUB: Pointer to slab */
extern void arch_unmap_area(struct mm_struct *, unsigned long);
extern void arch_unmap_area_topdown(struct mm_struct *, unsigned long);
-#if NR_CPUS >= CONFIG_SPLIT_PTLOCK_CPUS
+#if USE_SPLIT_PTLOCKS
/*
* The mm counters are not protected by its page_table_lock,
* so must be incremented atomically.
#define inc_mm_counter(mm, member) atomic_long_inc(&(mm)->_##member)
#define dec_mm_counter(mm, member) atomic_long_dec(&(mm)->_##member)
-#else /* NR_CPUS < CONFIG_SPLIT_PTLOCK_CPUS */
+#else /* !USE_SPLIT_PTLOCKS */
/*
* The mm counters are protected by its page_table_lock,
* so can be incremented directly.
#define inc_mm_counter(mm, member) (mm)->_##member++
#define dec_mm_counter(mm, member) (mm)->_##member--
-#endif /* NR_CPUS < CONFIG_SPLIT_PTLOCK_CPUS */
+#endif /* !USE_SPLIT_PTLOCKS */
#define get_mm_rss(mm) \
(get_mm_counter(mm, file_rss) + get_mm_counter(mm, anon_rss))
+++ /dev/null
-/******************************************************************************
- * balloon.h
- *
- * Xen balloon driver - enables returning/claiming memory to/from Xen.
- *
- * Copyright (c) 2003, B Dragovic
- * Copyright (c) 2003-2004, M Williamson, K Fraser
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License version 2
- * as published by the Free Software Foundation; or, when distributed
- * separately from the Linux kernel or incorporated into other
- * software packages, subject to the following license:
- *
- * Permission is hereby granted, free of charge, to any person obtaining a copy
- * of this source file (the "Software"), to deal in the Software without
- * restriction, including without limitation the rights to use, copy, modify,
- * merge, publish, distribute, sublicense, and/or sell copies of the Software,
- * and to permit persons to whom the Software is furnished to do so, subject to
- * the following conditions:
- *
- * The above copyright notice and this permission notice shall be included in
- * all copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
- * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
- * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
- * IN THE SOFTWARE.
- */
-
-#ifndef __XEN_BALLOON_H__
-#define __XEN_BALLOON_H__
-
-#include <linux/spinlock.h>
-
-#if 0
-/*
- * Inform the balloon driver that it should allow some slop for device-driver
- * memory activities.
- */
-void balloon_update_driver_allowance(long delta);
-
-/* Allocate/free a set of empty pages in low memory (i.e., no RAM mapped). */
-struct page **alloc_empty_pages_and_pagevec(int nr_pages);
-void free_empty_pages_and_pagevec(struct page **pagevec, int nr_pages);
-
-void balloon_release_driver_page(struct page *page);
-
-/*
- * Prevent the balloon driver from changing the memory reservation during
- * a driver critical region.
- */
-extern spinlock_t balloon_lock;
-#define balloon_lock(__flags) spin_lock_irqsave(&balloon_lock, __flags)
-#define balloon_unlock(__flags) spin_unlock_irqrestore(&balloon_lock, __flags)
-#endif
-
-#endif /* __XEN_BALLOON_H__ */
/* Clear an irq's pending state, in preparation for polling on it */
void xen_clear_irq_pending(int irq);
+void xen_set_irq_pending(int irq);
+bool xen_test_irq_pending(int irq);
/* Poll waiting for an irq to become pending. In the usual case, the
irq will be disabled so it won't deliver an interrupt. */
* megabyte, or one gigabyte, respectively.
*/
-unsigned long long memparse(char *ptr, char **retptr)
+unsigned long long memparse(const char *ptr, char **retptr)
{
char *endptr; /* local pointer to end of parsed string */
projects / linux-2.6-omap-h63xx.git / commitdiff