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    SubjectRe: [PATCH v2 09/15] svm: Add support for activate/deactivate AVIC at runtime
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    On 15.08.19 18:25, Suthikulpanit, Suravee wrote:
    > Add necessary logics for supporting activate/deactivate AVIC at runtime.
    >
    > Signed-off-by: Suravee Suthikulpanit <suravee.suthikulpanit@amd.com>
    > ---
    > arch/x86/kvm/svm.c | 27 +++++++++++++++++++++++++--
    > 1 file changed, 25 insertions(+), 2 deletions(-)
    >
    > diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
    > index 47f2439..cfa4b13 100644
    > --- a/arch/x86/kvm/svm.c
    > +++ b/arch/x86/kvm/svm.c
    > @@ -385,6 +385,7 @@ struct amd_svm_iommu_ir {
    > static void svm_flush_tlb(struct kvm_vcpu *vcpu, bool invalidate_gpa);
    > static void svm_complete_interrupts(struct vcpu_svm *svm);
    > static bool svm_get_enable_apicv(struct kvm *kvm);
    > +static inline void avic_post_state_restore(struct kvm_vcpu *vcpu);
    >
    > static int nested_svm_exit_handled(struct vcpu_svm *svm);
    > static int nested_svm_intercept(struct vcpu_svm *svm);
    > @@ -2343,6 +2344,10 @@ static void svm_vcpu_blocking(struct kvm_vcpu *vcpu)
    >
    > static void svm_vcpu_unblocking(struct kvm_vcpu *vcpu)
    > {
    > + if (kvm_check_request(KVM_REQ_APICV_ACTIVATE, vcpu))
    > + kvm_vcpu_activate_apicv(vcpu);
    > + if (kvm_check_request(KVM_REQ_APICV_DEACTIVATE, vcpu))
    > + kvm_vcpu_deactivate_apicv(vcpu);
    > avic_set_running(vcpu, true);
    > }
    >
    > @@ -5182,10 +5187,19 @@ static void svm_refresh_apicv_exec_ctrl(struct kvm_vcpu *vcpu)
    > struct vcpu_svm *svm = to_svm(vcpu);
    > struct vmcb *vmcb = svm->vmcb;
    >
    > - if (kvm_vcpu_apicv_active(vcpu))
    > + if (kvm_vcpu_apicv_active(vcpu)) {
    > + /**
    > + * During AVIC temporary deactivation, guest could update
    > + * APIC ID, DFR and LDR registers, which would not be trapped
    > + * by avic_unaccelerated_ccess_interception(). In this case,

    typo

    Alex

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