Patchwork [5/9] target-i386: check/enforce: Check all CPUID.80000001H.EDX bits

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Submitter Eduardo Habkost
Date Jan. 4, 2013, 3:37 p.m.
Message ID <1357313864-31026-6-git-send-email-ehabkost@redhat.com>
Download mbox | patch
Permalink /patch/209487/
State New
Headers show

Comments

Eduardo Habkost - Jan. 4, 2013, 3:37 p.m.
I have no idea why PPRO_FEATURES was being ignored on the check of the
CPUID.80000001H.EDX bits. I believe it was a mistake, and it was
supposed to be ~(PPRO_FEATURES & CPUID_EXT2_AMD_ALIASES) or just
~CPUID_EXT2_AMD_ALIASES, because some time ago kvm_cpu_fill_host() used
the CPUID instruction directly (instead of
kvm_arch_get_supported_cpuid()).

But now kvm_cpu_fill_host() use kvm_arch_get_supported_cpuid(), and
kvm_arch_get_supported_cpuid() returns all supported bits for
CPUID.80000001H.EDX, even the AMD aliases (that are explicitly copied
from CPUID.01H.EDX), so we can make the code check/enforce all the
CPUID.80000001H.EDX bits.

Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
---
 target-i386/cpu.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

Patch

diff --git a/target-i386/cpu.c b/target-i386/cpu.c
index f1a21cf..13075c7 100644
--- a/target-i386/cpu.c
+++ b/target-i386/cpu.c
@@ -967,7 +967,7 @@  static int kvm_check_features_against_host(x86_def_t *guest_def)
         {&guest_def->ext_features, &host_def.ext_features,
             ~0, ext_feature_name, 0x00000001, R_ECX},
         {&guest_def->ext2_features, &host_def.ext2_features,
-            ~PPRO_FEATURES, ext2_feature_name, 0x80000001, R_EDX},
+            ~0, ext2_feature_name, 0x80000001, R_EDX},
         {&guest_def->ext3_features, &host_def.ext3_features,
             ~CPUID_EXT3_SVM, ext3_feature_name, 0x80000001, R_ECX}};