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Subject:	[Xen-changelog] [xen-unstable] x86: Check for MWAIT in CPUID before using it in ACPI idle code.
From:	Xen patchbot-unstable <patchbot-unstable@xxxxxxxxxxxxxxxxxxx>
Date:	Tue, 23 Nov 2010 04:15:20 -0800
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# HG changeset patch
# User Keir Fraser <keir@xxxxxxx>
# Date 1290453180 0
# Node ID 0cc4ed1ce1f34ce442ed4da106e555931c895395
# Parent  899131a8f9d2b99acc4bbe18593952d30446e71b
x86: Check for MWAIT in CPUID before using it in ACPI idle code.

Signed-off-by: Keir Fraser <keir@xxxxxxx>
---
 xen/arch/x86/acpi/cpu_idle.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletion(-)

diff -r 899131a8f9d2 -r 0cc4ed1ce1f3 xen/arch/x86/acpi/cpu_idle.c
--- a/xen/arch/x86/acpi/cpu_idle.c      Mon Nov 22 08:29:03 2010 +0000
+++ b/xen/arch/x86/acpi/cpu_idle.c      Mon Nov 22 19:13:00 2010 +0000
@@ -841,7 +841,8 @@ static void set_cx(
     {
     case ACPI_ADR_SPACE_FIXED_HARDWARE:
         if ( xen_cx->reg.bit_width == VENDOR_INTEL &&
-             xen_cx->reg.bit_offset == NATIVE_CSTATE_BEYOND_HALT )
+             xen_cx->reg.bit_offset == NATIVE_CSTATE_BEYOND_HALT &&
+             boot_cpu_has(X86_FEATURE_MWAIT) )
             cx->entry_method = ACPI_CSTATE_EM_FFH;
         else
             cx->entry_method = ACPI_CSTATE_EM_HALT;

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