Re: [PATCH v2 09/15] svm: Add support for activate/deactivate AVIC at runtime

[Alexander Graf <graf@amazon.com>]

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