linux-kernel - Re: [PATCH 2/8] KVM: x86: SVM: use vmcb01 in avic_init_vmcb and init

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Date:   Sun, 27 Mar 2022 18:15:30 +0300
From:   Maxim Levitsky <mlevitsk@...hat.com>
To:     Paolo Bonzini <pbonzini@...hat.com>, kvm@...r.kernel.org
Cc:     Jim Mattson <jmattson@...gle.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Borislav Petkov <bp@...en8.de>, Joerg Roedel <joro@...tes.org>,
        Ingo Molnar <mingo@...hat.com>,
        Suravee Suthikulpanit <suravee.suthikulpanit@....com>,
        x86@...nel.org, "H. Peter Anvin" <hpa@...or.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        linux-kernel@...r.kernel.org,
        Sean Christopherson <seanjc@...gle.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH 2/8] KVM: x86: SVM: use vmcb01 in avic_init_vmcb and
 init_vmcb

On Thu, 2022-03-24 at 19:12 +0100, Paolo Bonzini wrote:
> On 3/22/22 18:24, Maxim Levitsky wrote:
> >   
> >   void avic_init_vmcb(struct vcpu_svm *svm)
> >   {
> > -	struct vmcb *vmcb = svm->vmcb;
> > +	struct vmcb *vmcb = svm->vmcb01.ptr;
> >   	struct kvm_svm *kvm_svm = to_kvm_svm(svm->vcpu.kvm);
> >   	phys_addr_t bpa = __sme_set(page_to_phys(svm->avic_backing_page));
> >   	phys_addr_t lpa = __sme_set(page_to_phys(kvm_svm->avic_logical_id_table_page));
> 
> Let's do this for consistency with e.g. svm_hv_init_vmcb:
> 
> diff --git a/arch/x86/kvm/svm/avic.c b/arch/x86/kvm/svm/avic.c
> index b39fe614467a..ab202158137d 100644
> --- a/arch/x86/kvm/svm/avic.c
> +++ b/arch/x86/kvm/svm/avic.c
> @@ -165,9 +165,8 @@ int avic_vm_init(struct kvm *kvm)
>   	return err;
>   }
>   
> -void avic_init_vmcb(struct vcpu_svm *svm)
> +void avic_init_vmcb(struct vcpu_svm *svm, struct vmcb *vmcb)
>   {
> -	struct vmcb *vmcb = svm->vmcb01.ptr;
>   	struct kvm_svm *kvm_svm = to_kvm_svm(svm->vcpu.kvm);
>   	phys_addr_t bpa = __sme_set(page_to_phys(svm->avic_backing_page));
>   	phys_addr_t lpa = __sme_set(page_to_phys(kvm_svm->avic_logical_id_table_page));
> diff --git a/arch/x86/kvm/svm/svm.c b/arch/x86/kvm/svm/svm.c
> index cc02506b7a19..ced8edad0c87 100644
> --- a/arch/x86/kvm/svm/svm.c
> +++ b/arch/x86/kvm/svm/svm.c
> @@ -1123,7 +1123,7 @@ static void init_vmcb(struct kvm_vcpu *vcpu)
>   		set_msr_interception(vcpu, svm->msrpm, MSR_IA32_SPEC_CTRL, 1, 1);
>   
>   	if (kvm_vcpu_apicv_active(vcpu))
> -		avic_init_vmcb(svm);
> +		avic_init_vmcb(svm, vmcb);
>   
>   	if (vgif) {
>   		svm_clr_intercept(svm, INTERCEPT_STGI);
> diff --git a/arch/x86/kvm/svm/svm.h b/arch/x86/kvm/svm/svm.h
> index d07a5b88ea96..bbac6c24a8b8 100644
> --- a/arch/x86/kvm/svm/svm.h
> +++ b/arch/x86/kvm/svm/svm.h
> @@ -591,7 +591,7 @@ extern struct kvm_x86_nested_ops svm_nested_ops;
>   int avic_ga_log_notifier(u32 ga_tag);
>   void avic_vm_destroy(struct kvm *kvm);
>   int avic_vm_init(struct kvm *kvm);
> -void avic_init_vmcb(struct vcpu_svm *svm);
> +void avic_init_vmcb(struct vcpu_svm *svm, struct vmcb *vmcb);
>   int avic_incomplete_ipi_interception(struct kvm_vcpu *vcpu);
>   int avic_unaccelerated_access_interception(struct kvm_vcpu *vcpu);
>   int avic_init_vcpu(struct vcpu_svm *svm);
> 

This is a very good idea, I will do this in the 
next version of the patches.

Best regards,
	Maxim Levitsky