KVM: x86: nSVM: support PAUSE filtering when L0 doesn't intercept PAUSE

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Expose the pause filtering and threshold in the guest CPUID
and support PAUSE filtering when possible:

- If the L0 doesn't intercept PAUSE (cpu_pm=on), then allow L1 to
  have full control over PAUSE filtering.

- if the L1 doesn't intercept PAUSE, use host values and update
  the adaptive count/threshold even when running nested.

- Otherwise always exit to L1; it is not really possible to merge
  the fields correctly.  It is expected that in this case, userspace
  will not enable this feature in the guest CPUID, to avoid having the
  guest update both fields pointlessly.

Signed-off-by: Maxim Levitsky <mlevitsk@redhat.com>
Message-Id: <20220322174050.241850-4-mlevitsk@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

...

This commit is contained in:

Maxim Levitsky 2022-03-22 19:40:47 +02:00 • committed by Paolo Bonzini

parent d20c796ca3

commit 74fd41ed16

3 changed files with 47 additions and 3 deletions

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26

arch/x86/kvm/svm/nested.c

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22

arch/x86/kvm/svm/svm.c

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2

arch/x86/kvm/svm/svm.h

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