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| author | Sean Christopherson <seanjc@google.com> | 2023-01-06 01:12:57 +0000 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2023-01-13 10:45:31 -0500 |
| commit | 9a364857ab4f8d59d417eca88a39ddf9b308237b (patch) | |
| tree | f1c7856eb08e3fe08e383292e629bba71256eb7b /arch/x86/kvm/svm | |
| parent | 5063c41bebac8d18a83ac7b5d54782d73a9ab5f7 (diff) | |
| download | linux-stable-9a364857ab4f8d59d417eca88a39ddf9b308237b.tar.gz linux-stable-9a364857ab4f8d59d417eca88a39ddf9b308237b.tar.bz2 linux-stable-9a364857ab4f8d59d417eca88a39ddf9b308237b.zip | |
KVM: SVM: Inhibit AVIC if vCPUs are aliased in logical mode
Inhibit SVM's AVIC if multiple vCPUs are aliased to the same logical ID.
Architecturally, all CPUs whose logical ID matches the MDA are supposed
to receive the interrupt; overwriting existing entries in AVIC's
logical=>physical map can result in missed IPIs.
Fixes: 18f40c53e10f ("svm: Add VMEXIT handlers for AVIC")
Reviewed-by: Maxim Levitsky <mlevitsk@redhat.com>
Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-Id: <20230106011306.85230-25-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'arch/x86/kvm/svm')
| -rw-r--r-- | arch/x86/kvm/svm/avic.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/arch/x86/kvm/svm/avic.c b/arch/x86/kvm/svm/avic.c index d1ac19f053ce..1fd473a57159 100644 --- a/arch/x86/kvm/svm/avic.c +++ b/arch/x86/kvm/svm/avic.c @@ -967,7 +967,8 @@ bool avic_check_apicv_inhibit_reasons(enum kvm_apicv_inhibit reason) BIT(APICV_INHIBIT_REASON_SEV) | BIT(APICV_INHIBIT_REASON_PHYSICAL_ID_ALIASED) | BIT(APICV_INHIBIT_REASON_APIC_ID_MODIFIED) | - BIT(APICV_INHIBIT_REASON_APIC_BASE_MODIFIED); + BIT(APICV_INHIBIT_REASON_APIC_BASE_MODIFIED) | + BIT(APICV_INHIBIT_REASON_LOGICAL_ID_ALIASED); return supported & BIT(reason); } |