path: root/arch/x86/kernel
diff options
authorAvi Kivity <avi@qumranet.com>2008-08-25 13:11:27 +0300
committerIngo Molnar <mingo@elte.hu>2008-08-25 12:31:32 +0200
commitc7ffa6c26277b403920e2255d10df849bd613380 (patch)
treeeb28459e83c926a44451b2303d5bce42f21fd54c /arch/x86/kernel
parent83097aca8567a0bd593534853b71fe0fa9a75d69 (diff)
x86: default to reboot via ACPI
Triple-fault and keyboard reset may assert INIT instead of RESET; however INIT is blocked when Intel VT is enabled. This leads to a partially reset machine when invoking emergency_restart via sysrq-b: the processor is still working but other parts of the system are dead. Default to rebooting via ACPI, which correctly asserts RESET and reboots the machine. This is safe since we will fall back to keyboard reset and triple fault if acpi is not enabled or if the reset is not successful. Signed-off-by: Avi Kivity <avi@qumranet.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch/x86/kernel')
1 files changed, 5 insertions, 1 deletions
diff --git a/arch/x86/kernel/reboot.c b/arch/x86/kernel/reboot.c
index 724adfc63cb..f4c93f1cfc1 100644
--- a/arch/x86/kernel/reboot.c
+++ b/arch/x86/kernel/reboot.c
@@ -29,7 +29,11 @@ EXPORT_SYMBOL(pm_power_off);
static const struct desc_ptr no_idt = {};
static int reboot_mode;
-enum reboot_type reboot_type = BOOT_KBD;
+ * Keyboard reset and triple fault may result in INIT, not RESET, which
+ * doesn't work when we're in vmx root mode. Try ACPI first.
+ */
+enum reboot_type reboot_type = BOOT_ACPI;
int reboot_force;
#if defined(CONFIG_X86_32) && defined(CONFIG_SMP)