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Commit 46781eae authored by Suravee Suthikulpanit's avatar Suravee Suthikulpanit Committed by Paolo Bonzini
Browse files

svm: Do not expose x2APIC when enable AVIC 



Since AVIC only virtualizes xAPIC hardware for the guest, this patch
disable x2APIC support in guest CPUID.

Signed-off-by: default avatarSuravee Suthikulpanit <suravee.suthikulpanit@amd.com>
Signed-off-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
parent be8ca170

arch/x86/kvm/svm.c

+12 −0
Original line number Diff line number Diff line
@@ -4572,14 +4572,26 @@ static u64 svm_get_mt_mask(struct kvm_vcpu *vcpu, gfn_t gfn, bool is_mmio) 
static void svm_cpuid_update(struct kvm_vcpu *vcpu)

{

	struct vcpu_svm *svm = to_svm(vcpu);

	struct kvm_cpuid_entry2 *entry;



	/* Update nrips enabled cache */

	svm->nrips_enabled = !!guest_cpuid_has_nrips(&svm->vcpu);



	if (!kvm_vcpu_apicv_active(vcpu))

		return;



	entry = kvm_find_cpuid_entry(vcpu, 1, 0);

	if (entry)

		entry->ecx &= ~bit(X86_FEATURE_X2APIC);

}



static void svm_set_supported_cpuid(u32 func, struct kvm_cpuid_entry2 *entry)

{

	switch (func) {

	case 0x1:

		if (avic)

			entry->ecx &= ~bit(X86_FEATURE_X2APIC);

		break;

	case 0x80000001:

		if (nested)

			entry->ecx |= (1 << 2); /* Set SVM bit */