KVM: SVM: Introduce hybrid-AVIC mode

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Currently, AVIC is inhibited when booting a VM w/ x2APIC support.
because AVIC cannot virtualize x2APIC MSR register accesses.
However, the AVIC doorbell can be used to accelerate interrupt
injection into a running vCPU, while all guest accesses to x2APIC MSRs
will be intercepted and emulated by KVM.

With hybrid-AVIC support, the APICV_INHIBIT_REASON_X2APIC is
no longer enforced.

Suggested-by: Maxim Levitsky <mlevitsk@redhat.com>
Reviewed-by: Maxim Levitsky <mlevitsk@redhat.com>
Signed-off-by: Suravee Suthikulpanit <suravee.suthikulpanit@amd.com>
Message-Id: <20220519102709.24125-14-suravee.suthikulpanit@amd.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

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This commit is contained in:

Suravee Suthikulpanit 2022-05-19 05:27:05 -05:00 • committed by Paolo Bonzini

parent c0caeee65a

commit 0e311d33bf

3 changed files with 11 additions and 16 deletions

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5

arch/x86/include/asm/kvm_host.h

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13

arch/x86/kvm/svm/avic.c

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9

arch/x86/kvm/svm/svm.c

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