[Qemu-devel] [PATCH] target-i386: Do not announce extended mwait features

[Adam Lackorzynski]

CPUID claims that extended monitor/mwait features are available but the
mwait helper instantly raises a GPF if they are used. Thus do not announce
that the extension are available.

Signed-off-by: Adam Lackorzynski <address@hidden>
---
 target-i386/cpuid.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/target-i386/cpuid.c b/target-i386/cpuid.c
index 5382a28..28275a6 100644
--- a/target-i386/cpuid.c
+++ b/target-i386/cpuid.c
@@ -1104,7 +1104,7 @@ void cpu_x86_cpuid(CPUX86State *env, uint32_t index, 
uint32_t count,
         /* mwait info: needed for Core compatibility */
         *eax = 0; /* Smallest monitor-line size in bytes */
         *ebx = 0; /* Largest monitor-line size in bytes */
-        *ecx = CPUID_MWAIT_EMX | CPUID_MWAIT_IBE;
+        *ecx = 0; /* Supported extensions */
         *edx = 0;
         break;
     case 6:
-- 
1.7.4.1