xen: setup percpu data pointers

We need to access percpu data fairly early, so set up the percpu
registers as soon as possible.  We only need to load the appropriate
segment register.  We already have a GDT, but its hard to change it
early because we need to manipulate the pagetable to do so, and that
hasn't been set up yet.

Also, set the kernel stack when bringing up secondary CPUs.  If we
don't they all end up sharing the same stack...

Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>

diff --git a/arch/x86/xen/enlighten.c b/arch/x86/xen/enlighten.c
index cd022c43dfbc7d637d00d580c3431bd24dd1f0a2..aed7ceeb4b65d10091dbc59a51598a80c7141ead 100644 (file)
--- a/arch/x86/xen/enlighten.c
+++ b/arch/x86/xen/enlighten.c
@@ -66,6 +66,8 @@ EXPORT_SYMBOL_GPL(xen_start_info);
 
 struct shared_info xen_dummy_shared_info;
 
+void *xen_initial_gdt;
+
 /*
  * Point at some empty memory to start with. We map the real shared_info
  * page as soon as fixmap is up and running.
@@ -917,8 +919,19 @@ asmlinkage void __init xen_start_kernel(void)
        have_vcpu_info_placement = 0;
 #endif
 
-       /* setup percpu state */
+#ifdef CONFIG_X86_64
+       /*
+        * Setup percpu state.  We only need to do this for 64-bit
+        * because 32-bit already has %fs set properly.
+        */
        load_percpu_segment(0);
+#endif
+       /*
+        * The only reliable way to retain the initial address of the
+        * percpu gdt_page is to remember it here, so we can go and
+        * mark it RW later, when the initial percpu area is freed.
+        */
+       xen_initial_gdt = &per_cpu(gdt_page, 0);
 
        xen_smp_init();
 

diff --git a/arch/x86/xen/smp.c b/arch/x86/xen/smp.c
index 88d5d5ec6bebbe01d913597c4e50f9aecc38a73b..035582ae815dcaa581f2931d93b0fb88394dacb0 100644 (file)
--- a/arch/x86/xen/smp.c
+++ b/arch/x86/xen/smp.c
@@ -170,8 +170,7 @@ static void __init xen_smp_prepare_boot_cpu(void)
 
        /* We've switched to the "real" per-cpu gdt, so make sure the
           old memory can be recycled */
-       make_lowmem_page_readwrite(__per_cpu_load +
-                                  (unsigned long)&per_cpu_var(gdt_page));
+       make_lowmem_page_readwrite(xen_initial_gdt);
 
        xen_setup_vcpu_info_placement();
 }
@@ -287,6 +286,9 @@ static int __cpuinit xen_cpu_up(unsigned int cpu)
        irq_ctx_init(cpu);
 #else
        clear_tsk_thread_flag(idle, TIF_FORK);
+       per_cpu(kernel_stack, cpu) =
+               (unsigned long)task_stack_page(idle) -
+               KERNEL_STACK_OFFSET + THREAD_SIZE;
 #endif
        xen_setup_timer(cpu);
        xen_init_lock_cpu(cpu);

diff --git a/arch/x86/xen/xen-ops.h b/arch/x86/xen/xen-ops.h
index 11913fc94c14f2ae2d6566fb0f309396f4d51827..2f5ef2632ea23bc29d698d043738c1d90545d467 100644 (file)
--- a/arch/x86/xen/xen-ops.h
+++ b/arch/x86/xen/xen-ops.h
@@ -10,6 +10,8 @@
 extern const char xen_hypervisor_callback[];
 extern const char xen_failsafe_callback[];
 
+extern void *xen_initial_gdt;
+
 struct trap_info;
 void xen_copy_trap_info(struct trap_info *traps);