diff options
| author | Suravee Suthikulpanit <suravee.suthikulpanit@amd.com> | 2022-05-19 12:26:58 +0200 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2022-06-24 18:45:29 +0200 |
| commit | ab1b1dc131cd7da4c66758e711c0f69da3633561 (patch) | |
| tree | 0dcd4030476225d4dbb3e304782fecbc154e845c | |
| parent | KVM: SVM: Update avic_kick_target_vcpus to support 32-bit APIC ID (diff) | |
| download | linux-ab1b1dc131cd7da4c66758e711c0f69da3633561.tar.xz linux-ab1b1dc131cd7da4c66758e711c0f69da3633561.zip | |
KVM: SVM: Do not support updating APIC ID when in x2APIC mode
In X2APIC mode, the Logical Destination Register is read-only,
which provides a fixed mapping between the logical and physical
APIC IDs. Therefore, there is no Logical APIC ID table in X2AVIC
and the processor uses the X2APIC ID in the backing page to create
a vCPU’s logical ID.
In addition, KVM does not support updating APIC ID in x2APIC mode,
which means AVIC does not need to handle this case.
Therefore, check x2APIC mode when handling physical and logical
APIC ID update, and when invalidating logical APIC ID table.
Reviewed-by: Maxim Levitsky <mlevitsk@redhat.com>
Suggested-by: Maxim Levitsky <mlevitsk@redhat.com>
Signed-off-by: Suravee Suthikulpanit <suravee.suthikulpanit@amd.com>
Message-Id: <20220519102709.24125-7-suravee.suthikulpanit@amd.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
| -rw-r--r-- | arch/x86/kvm/svm/avic.c | 11 |
1 files changed, 10 insertions, 1 deletions
diff --git a/arch/x86/kvm/svm/avic.c b/arch/x86/kvm/svm/avic.c index 8b8a221cd635..cc4da232040c 100644 --- a/arch/x86/kvm/svm/avic.c +++ b/arch/x86/kvm/svm/avic.c @@ -526,8 +526,13 @@ static void avic_invalidate_logical_id_entry(struct kvm_vcpu *vcpu) { struct vcpu_svm *svm = to_svm(vcpu); bool flat = svm->dfr_reg == APIC_DFR_FLAT; - u32 *entry = avic_get_logical_id_entry(vcpu, svm->ldr_reg, flat); + u32 *entry; + /* Note: x2AVIC does not use logical APIC ID table */ + if (apic_x2apic_mode(vcpu->arch.apic)) + return; + + entry = avic_get_logical_id_entry(vcpu, svm->ldr_reg, flat); if (entry) clear_bit(AVIC_LOGICAL_ID_ENTRY_VALID_BIT, (unsigned long *)entry); } @@ -539,6 +544,10 @@ static int avic_handle_ldr_update(struct kvm_vcpu *vcpu) u32 ldr = kvm_lapic_get_reg(vcpu->arch.apic, APIC_LDR); u32 id = kvm_xapic_id(vcpu->arch.apic); + /* AVIC does not support LDR update for x2APIC */ + if (apic_x2apic_mode(vcpu->arch.apic)) + return 0; + if (ldr == svm->ldr_reg) return 0; |