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| author | Avi Kivity <avi@redhat.com> | 2010-11-09 16:15:43 +0200 |
|---|---|---|
| committer | Avi Kivity <avi@redhat.com> | 2011-01-12 11:29:17 +0200 |
| commit | 945ee35e0764a834bc5bc5d572085d5b6409902a (patch) | |
| tree | e2ecb853b8bca8a20261bd652fa71d05309da226 /arch/x86/kvm/x86.c | |
| parent | 2a6b20b83d1d37db57a9c25d99dc78454ad0747b (diff) | |
| download | lwn-945ee35e0764a834bc5bc5d572085d5b6409902a.tar.gz lwn-945ee35e0764a834bc5bc5d572085d5b6409902a.zip | |
KVM: Mask KVM_GET_SUPPORTED_CPUID data with Linux cpuid info
This allows Linux to mask cpuid bits if, for example, nx is enabled on only
some cpus.
Signed-off-by: Avi Kivity <avi@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Diffstat (limited to 'arch/x86/kvm/x86.c')
| -rw-r--r-- | arch/x86/kvm/x86.c | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index c673e726fbdb..651cf9004fbe 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -2227,6 +2227,11 @@ out: return r; } +static void cpuid_mask(u32 *word, int wordnum) +{ + *word &= boot_cpu_data.x86_capability[wordnum]; +} + static void do_cpuid_1_ent(struct kvm_cpuid_entry2 *entry, u32 function, u32 index) { @@ -2301,7 +2306,9 @@ static void do_cpuid_ent(struct kvm_cpuid_entry2 *entry, u32 function, break; case 1: entry->edx &= kvm_supported_word0_x86_features; + cpuid_mask(&entry->edx, 0); entry->ecx &= kvm_supported_word4_x86_features; + cpuid_mask(&entry->ecx, 4); /* we support x2apic emulation even if host does not support * it since we emulate x2apic in software */ entry->ecx |= F(X2APIC); @@ -2392,7 +2399,9 @@ static void do_cpuid_ent(struct kvm_cpuid_entry2 *entry, u32 function, break; case 0x80000001: entry->edx &= kvm_supported_word1_x86_features; + cpuid_mask(&entry->edx, 1); entry->ecx &= kvm_supported_word6_x86_features; + cpuid_mask(&entry->ecx, 6); break; } |