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| author | Sean Christopherson <seanjc@google.com> | 2023-01-06 02:13:02 +0100 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2023-01-13 16:45:34 +0100 |
| commit | a790e338c7c4971f83e680e59a91d1b91263c8f7 (patch) | |
| tree | c48722b803ad76b3c15f5a0a615c7cbf18dead48 /arch/x86/kvm/svm/avic.c | |
| parent | KVM: SVM: Handle multiple logical targets in AVIC kick fastpath (diff) | |
| download | linux-a790e338c7c4971f83e680e59a91d1b91263c8f7.tar.xz linux-a790e338c7c4971f83e680e59a91d1b91263c8f7.zip | |
KVM: SVM: Ignore writes to Remote Read Data on AVIC write traps
Drop writes to APIC_RRR, a.k.a. Remote Read Data Register, on AVIC
unaccelerated write traps. The register is read-only and isn't emulated
by KVM. Sending the register through kvm_apic_write_nodecode() will
result in screaming when x2APIC is enabled due to the unexpected failure
to retrieve the MSR (KVM expects that only "legal" accesses will trap).
Fixes: 4d1d7942e36a ("KVM: SVM: Introduce logic to (de)activate x2AVIC mode")
Signed-off-by: Sean Christopherson <seanjc@google.com>
Reviewed-by: Maxim Levitsky <mlevitsk@redhat.com>
Message-Id: <20230106011306.85230-30-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to '')
| -rw-r--r-- | arch/x86/kvm/svm/avic.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/arch/x86/kvm/svm/avic.c b/arch/x86/kvm/svm/avic.c index 2c6737f72bd4..ff08732469cb 100644 --- a/arch/x86/kvm/svm/avic.c +++ b/arch/x86/kvm/svm/avic.c @@ -628,6 +628,9 @@ static int avic_unaccel_trap_write(struct kvm_vcpu *vcpu) case APIC_DFR: avic_handle_dfr_update(vcpu); break; + case APIC_RRR: + /* Ignore writes to Read Remote Data, it's read-only. */ + return 1; default: break; } |