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


From: Alexander Graf
Subject: Re: [Qemu-devel] [PATCH] target-i386: Do not announce extended mwait features
Date: Wed, 16 Mar 2011 18:19:30 +0100
User-agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.2.13) Gecko/20101206 SUSE/3.1.7 Thunderbird/3.1.7

On 03/16/2011 03:25 PM, Adam Lackorzynski wrote:
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.

Would be better to just implement mwait, no?


Alex

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:




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