KVM: x86: nSVM: optimize svm_set_x2apic_msr_interception

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- Avoid toggling the x2apic msr interception if it is already up to date.

- Avoid touching L0 msr bitmap when AVIC is inhibited on entry to
  the guest mode, because in this case the guest usually uses its
  own msr bitmap.

  Later on VM exit, the 1st optimization will allow KVM to skip
  touching the L0 msr bitmap as well.

Reviewed-by: Suravee Suthikulpanit <suravee.suthikulpanit@amd.com>
Tested-by: Suravee Suthikulpanit <suravee.suthikulpanit@amd.com>
Signed-off-by: Maxim Levitsky <mlevitsk@redhat.com>
Message-Id: <20220519102709.24125-18-suravee.suthikulpanit@amd.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

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Maxim Levitsky 2022-05-19 05:27:09 -05:00 • committed by Paolo Bonzini

parent 39b6b8c35c

commit 091abbf578

3 changed files with 17 additions and 0 deletions

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8

arch/x86/kvm/svm/avic.c

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7

arch/x86/kvm/svm/svm.c

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2

arch/x86/kvm/svm/svm.h

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