Merge branch 'linus' into x86/cleanups

[linux-2.6-omap-h63xx.git] / arch / x86 / kernel / reboot.c

diff --git a/arch/x86/kernel/reboot.c b/arch/x86/kernel/reboot.c
index a90913cccfb7a1f577b78e30e0ade0ec9557c159..bf088c61fa40c07fc8616505a8cee640b8f35e1d 100644 (file)
--- a/arch/x86/kernel/reboot.c
+++ b/arch/x86/kernel/reboot.c
@@ -13,6 +13,7 @@
 #include <asm/reboot_fixups.h>
 #include <asm/reboot.h>
 #include <asm/pci_x86.h>
+#include <asm/virtext.h>
 
 #ifdef CONFIG_X86_32
 # include <linux/dmi.h>
@@ -39,6 +40,12 @@ int reboot_force;
 static int reboot_cpu = -1;
 #endif
 
+/* This is set if we need to go through the 'emergency' path.
+ * When machine_emergency_restart() is called, we may be on
+ * an inconsistent state and won't be able to do a clean cleanup
+ */
+static int reboot_emergency;
+
 /* This is set by the PCI code if either type 1 or type 2 PCI is detected */
 bool port_cf9_safe = false;
 
@@ -368,6 +375,48 @@ static inline void kb_wait(void)
        }
 }
 
+static void vmxoff_nmi(int cpu, struct die_args *args)
+{
+       cpu_emergency_vmxoff();
+}
+
+/* Use NMIs as IPIs to tell all CPUs to disable virtualization
+ */
+static void emergency_vmx_disable_all(void)
+{
+       /* Just make sure we won't change CPUs while doing this */
+       local_irq_disable();
+
+       /* We need to disable VMX on all CPUs before rebooting, otherwise
+        * we risk hanging up the machine, because the CPU ignore INIT
+        * signals when VMX is enabled.
+        *
+        * We can't take any locks and we may be on an inconsistent
+        * state, so we use NMIs as IPIs to tell the other CPUs to disable
+        * VMX and halt.
+        *
+        * For safety, we will avoid running the nmi_shootdown_cpus()
+        * stuff unnecessarily, but we don't have a way to check
+        * if other CPUs have VMX enabled. So we will call it only if the
+        * CPU we are running on has VMX enabled.
+        *
+        * We will miss cases where VMX is not enabled on all CPUs. This
+        * shouldn't do much harm because KVM always enable VMX on all
+        * CPUs anyway. But we can miss it on the small window where KVM
+        * is still enabling VMX.
+        */
+       if (cpu_has_vmx() && cpu_vmx_enabled()) {
+               /* Disable VMX on this CPU.
+                */
+               cpu_vmxoff();
+
+               /* Halt and disable VMX on the other CPUs */
+               nmi_shootdown_cpus(vmxoff_nmi);
+
+       }
+}
+
+
 void __attribute__((weak)) mach_reboot_fixups(void)
 {
 }
@@ -376,6 +425,9 @@ static void native_machine_emergency_restart(void)
 {
        int i;
 
+       if (reboot_emergency)
+               emergency_vmx_disable_all();
+
        /* Tell the BIOS if we want cold or warm reboot */
        *((unsigned short *)__va(0x472)) = reboot_mode;
 
@@ -482,13 +534,19 @@ void native_machine_shutdown(void)
 #endif
 }
 
+static void __machine_emergency_restart(int emergency)
+{
+       reboot_emergency = emergency;
+       machine_ops.emergency_restart();
+}
+
 static void native_machine_restart(char *__unused)
 {
        printk("machine restart\n");
 
        if (!reboot_force)
                machine_shutdown();
-       machine_emergency_restart();
+       __machine_emergency_restart(0);
 }
 
 static void native_machine_halt(void)
@@ -532,7 +590,7 @@ void machine_shutdown(void)
 
 void machine_emergency_restart(void)
 {
-       machine_ops.emergency_restart();
+       __machine_emergency_restart(1);
 }
 
 void machine_restart(char *cmd)
@@ -592,10 +650,7 @@ static int crash_nmi_callback(struct notifier_block *self,
 
 static void smp_send_nmi_allbutself(void)
 {
-       cpumask_t mask = cpu_online_map;
-       cpu_clear(safe_smp_processor_id(), mask);
-       if (!cpus_empty(mask))
-               send_IPI_mask(mask, NMI_VECTOR);
+       send_IPI_allbutself(NMI_VECTOR);
 }
 
 static struct notifier_block crash_nmi_nb = {