KVM: x86: nSVM: implement nested vGIF

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In case L1 enables vGIF for L2, the L2 cannot affect L1's GIF, regardless
of STGI/CLGI intercepts, and since VM entry enables GIF, this means
that L1's GIF is always 1 while L2 is running.

Thus in this case leave L1's vGIF in vmcb01, while letting L2
control the vGIF thus implementing nested vGIF.

Also allow KVM to toggle L1's GIF during nested entry/exit
by always using vmcb01.

Signed-off-by: Maxim Levitsky <mlevitsk@redhat.com>
Message-Id: <20220322174050.241850-5-mlevitsk@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

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Maxim Levitsky 2022-03-22 19:40:48 +02:00 • committed by Paolo Bonzini

parent 74fd41ed16

commit 0b34966218

3 changed files with 45 additions and 10 deletions

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15

arch/x86/kvm/svm/nested.c

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5

arch/x86/kvm/svm/svm.c

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35

arch/x86/kvm/svm/svm.h

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