KVM: x86: SVM: allow AVIC to co-exist with a nested guest running

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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>

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Maxim Levitsky 2022-03-22 19:40:50 +02:00 • committed by Paolo Bonzini

parent d5fa597ed8

commit f44509f849

4 changed files with 37 additions and 17 deletions

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7

arch/x86/kvm/svm/avic.c

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16

arch/x86/kvm/svm/nested.c

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arch/x86/kvm/svm/svm.c

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arch/x86/kvm/svm/svm.h

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