diff options
| author | Suravee Suthikulpanit <suravee.suthikulpanit@amd.com> | 2022-05-19 13:27:05 +0300 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2022-06-24 19:51:00 +0300 |
| commit | 0e311d33bfbef86da130674e8528cc23e6acfe16 (patch) | |
| tree | d403f50e8ef865cf7bb412dcbb2ce1a244fcf392 /arch/x86/kvm/svm/svm.c | |
| parent | c0caeee65af3944b7b8abbf566e7cc1fae15c775 (diff) | |
KVM: SVM: Introduce hybrid-AVIC mode
Currently, AVIC is inhibited when booting a VM w/ x2APIC support.
because AVIC cannot virtualize x2APIC MSR register accesses.
However, the AVIC doorbell can be used to accelerate interrupt
injection into a running vCPU, while all guest accesses to x2APIC MSRs
will be intercepted and emulated by KVM.
With hybrid-AVIC support, the APICV_INHIBIT_REASON_X2APIC is
no longer enforced.
Suggested-by: Maxim Levitsky <mlevitsk@redhat.com>
Reviewed-by: Maxim Levitsky <mlevitsk@redhat.com>
Signed-off-by: Suravee Suthikulpanit <suravee.suthikulpanit@amd.com>
Message-Id: <20220519102709.24125-14-suravee.suthikulpanit@amd.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'arch/x86/kvm/svm/svm.c')
| -rw-r--r-- | arch/x86/kvm/svm/svm.c | 9 |
1 files changed, 0 insertions, 9 deletions
diff --git a/arch/x86/kvm/svm/svm.c b/arch/x86/kvm/svm/svm.c index 491e4d549e2f..bb0457c1e41c 100644 --- a/arch/x86/kvm/svm/svm.c +++ b/arch/x86/kvm/svm/svm.c @@ -4160,7 +4160,6 @@ static void svm_vcpu_after_set_cpuid(struct kvm_vcpu *vcpu) { struct vcpu_svm *svm = to_svm(vcpu); struct kvm_cpuid_entry2 *best; - struct kvm *kvm = vcpu->kvm; vcpu->arch.xsaves_enabled = guest_cpuid_has(vcpu, X86_FEATURE_XSAVE) && boot_cpu_has(X86_FEATURE_XSAVE) && @@ -4192,14 +4191,6 @@ static void svm_vcpu_after_set_cpuid(struct kvm_vcpu *vcpu) vcpu->arch.reserved_gpa_bits &= ~(1UL << (best->ebx & 0x3f)); } - if (kvm_vcpu_apicv_active(vcpu)) { - /* - * AVIC does not work with an x2APIC mode guest. If the X2APIC feature - * is exposed to the guest, disable AVIC. - */ - if (guest_cpuid_has(vcpu, X86_FEATURE_X2APIC)) - kvm_set_apicv_inhibit(kvm, APICV_INHIBIT_REASON_X2APIC); - } init_vmcb_after_set_cpuid(vcpu); } |