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| author | Maxim Levitsky <mlevitsk@redhat.com> | 2022-03-22 20:40:50 +0300 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2022-04-02 12:41:24 +0300 |
| commit | f44509f849fe55bbd81bd3f099b9aecd19002243 (patch) | |
| tree | 5a8627eafcc467f8a29bf64a308a540352748813 /arch/x86/kvm/svm/avic.c | |
| parent | d5fa597ed87047117dc62ce1d38ba1d007442359 (diff) | |
| download | linux-f44509f849fe55bbd81bd3f099b9aecd19002243.tar.xz | |
KVM: x86: SVM: allow AVIC to co-exist with a nested guest running
Inhibit the AVIC of the vCPU that is running nested for the duration of the
nested run, so that all interrupts arriving from both its vCPU siblings
and from KVM are delivered using normal IPIs and cause that vCPU to vmexit.
Note that unlike normal AVIC inhibition, there is no need to
update the AVIC mmio memslot, because the nested guest uses its
own set of paging tables.
That also means that AVIC doesn't need to be inhibited VM wide.
Signed-off-by: Maxim Levitsky <mlevitsk@redhat.com>
Message-Id: <20220322174050.241850-7-mlevitsk@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'arch/x86/kvm/svm/avic.c')
| -rw-r--r-- | arch/x86/kvm/svm/avic.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/arch/x86/kvm/svm/avic.c b/arch/x86/kvm/svm/avic.c index b7dabc01d644..6c81abe3153b 100644 --- a/arch/x86/kvm/svm/avic.c +++ b/arch/x86/kvm/svm/avic.c @@ -356,6 +356,13 @@ int avic_incomplete_ipi_interception(struct kvm_vcpu *vcpu) return 1; } +unsigned long avic_vcpu_get_apicv_inhibit_reasons(struct kvm_vcpu *vcpu) +{ + if (is_guest_mode(vcpu)) + return APICV_INHIBIT_REASON_NESTED; + return 0; +} + static u32 *avic_get_logical_id_entry(struct kvm_vcpu *vcpu, u32 ldr, bool flat) { struct kvm_svm *kvm_svm = to_kvm_svm(vcpu->kvm); |