diff options
| author | Suravee Suthikulpanit <suravee.suthikulpanit@amd.com> | 2022-05-19 13:27:03 +0300 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2022-06-24 19:50:35 +0300 |
| commit | 4d1d7942e36add0aa741a62d0c8e3aba2d5b3ab1 (patch) | |
| tree | e91064793b187eeea8feaf28d053dec2855eb007 /arch/x86/kvm/svm/svm.c | |
| parent | 7a8f7c1f3434afc94b6895eff713e0fcea01e3b4 (diff) | |
KVM: SVM: Introduce logic to (de)activate x2AVIC mode
Introduce logic to (de)activate AVIC, which also allows
switching between AVIC to x2AVIC mode at runtime.
When an AVIC-enabled guest switches from APIC to x2APIC mode,
the SVM driver needs to perform the following steps:
1. Set the x2APIC mode bit for AVIC in VMCB along with the maximum
APIC ID support for each mode accodingly.
2. Disable x2APIC MSRs interception in order to allow the hardware
to virtualize x2APIC MSRs accesses.
Reported-by: kernel test robot <lkp@intel.com>
Reviewed-by: Maxim Levitsky <mlevitsk@redhat.com>
Signed-off-by: Suravee Suthikulpanit <suravee.suthikulpanit@amd.com>
Message-Id: <20220519102709.24125-12-suravee.suthikulpanit@amd.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'arch/x86/kvm/svm/svm.c')
| -rw-r--r-- | arch/x86/kvm/svm/svm.c | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/arch/x86/kvm/svm/svm.c b/arch/x86/kvm/svm/svm.c index 67ba0d3a7f62..491e4d549e2f 100644 --- a/arch/x86/kvm/svm/svm.c +++ b/arch/x86/kvm/svm/svm.c @@ -805,6 +805,24 @@ void svm_vcpu_init_msrpm(struct kvm_vcpu *vcpu, u32 *msrpm) } } +void svm_set_x2apic_msr_interception(struct vcpu_svm *svm, bool intercept) +{ + int i; + + if (avic_mode != AVIC_MODE_X2 || + !apic_x2apic_mode(svm->vcpu.arch.apic)) + return; + + for (i = 0; i < MAX_DIRECT_ACCESS_MSRS; i++) { + int index = direct_access_msrs[i].index; + + if ((index < APIC_BASE_MSR) || + (index > APIC_BASE_MSR + 0xff)) + continue; + set_msr_interception(&svm->vcpu, svm->msrpm, index, + !intercept, !intercept); + } +} void svm_vcpu_free_msrpm(u32 *msrpm) { |