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KVM: x86: mask unsupported XSAVE entries from leaf 0Dh index 0

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XSAVE entries that KVM does not support are reported by
KVM_GET_SUPPORTED_CPUID for leaf 0Dh index 0 if the host supports them;
they should be left out unless there is also hypervisor support for them.

Sub-leafs are correctly handled in supported_xcr0_bit, fix index 0
to match.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Gleb Natapov <gleb@redhat.com>
This commit is contained in:
Paolo Bonzini 2013-10-02 16:06:14 +02:00 committed by Gleb Natapov
parent 29242cb5c6
commit 647e23bb33
2 changed files with 4 additions and 1 deletions
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4
arch/x86/kvm/cpuid.c
View File

@ -182,7 +182,7 @@ static bool supported_xcr0_bit(unsigned bit)
{
u64 mask = ((u64)1 << bit);
return mask & (XSTATE_FP | XSTATE_SSE | XSTATE_YMM) & host_xcr0;
return mask & KVM_SUPPORTED_XCR0 & host_xcr0;
}
#define F(x) bit(X86_FEATURE_##x)
@ -383,6 +383,8 @@ static int do_cpuid_ent(struct kvm_cpuid_entry2 *entry, u32 function,
case 0xd: {
int idx, i;
entry->eax &= host_xcr0 & KVM_SUPPORTED_XCR0;
entry->edx &= (host_xcr0 & KVM_SUPPORTED_XCR0) >> 32;
entry->flags |= KVM_CPUID_FLAG_SIGNIFCANT_INDEX;
for (idx = 1, i = 1; idx < 64; ++idx) {
if (*nent >= maxnent)

1
arch/x86/kvm/x86.h
View File

@ -122,6 +122,7 @@ int kvm_write_guest_virt_system(struct x86_emulate_ctxt *ctxt,
gva_t addr, void *val, unsigned int bytes,
struct x86_exception *exception);
#define KVM_SUPPORTED_XCR0 (XSTATE_FP | XSTATE_SSE | XSTATE_YMM)
extern u64 host_xcr0;
extern struct static_key kvm_no_apic_vcpu;