linux-kernel - Re: [PATCH 2/8] KVM: nSVM: rename nested 'vmcb' to vmcb

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Date:   Thu, 20 Aug 2020 11:56:33 +0200
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     Maxim Levitsky <mlevitsk@...hat.com>, kvm@...r.kernel.org
Cc:     Jim Mattson <jmattson@...gle.com>, Joerg Roedel <joro@...tes.org>,
        Borislav Petkov <bp@...en8.de>,
        Thomas Gleixner <tglx@...utronix.de>,
        "H. Peter Anvin" <hpa@...or.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        "open list:X86 ARCHITECTURE (32-BIT AND 64-BIT)" 
        <linux-kernel@...r.kernel.org>,
        "maintainer:X86 ARCHITECTURE (32-BIT AND 64-BIT)" <x86@...nel.org>,
        Ingo Molnar <mingo@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Sean Christopherson <sean.j.christopherson@...el.com>
Subject: Re: [PATCH 2/8] KVM: nSVM: rename nested 'vmcb' to vmcb_gpa in few
 places

On 20/08/20 11:13, Maxim Levitsky wrote:
> No functional changes.
> 
> Signed-off-by: Maxim Levitsky <mlevitsk@...hat.com>
> ---
>  arch/x86/kvm/svm/nested.c | 10 +++++-----
>  arch/x86/kvm/svm/svm.c    | 13 +++++++------
>  arch/x86/kvm/svm/svm.h    |  2 +-
>  3 files changed, 13 insertions(+), 12 deletions(-)
> 
> diff --git a/arch/x86/kvm/svm/nested.c b/arch/x86/kvm/svm/nested.c
> index fb68467e6049..d9755eab2199 100644
> --- a/arch/x86/kvm/svm/nested.c
> +++ b/arch/x86/kvm/svm/nested.c
> @@ -431,7 +431,7 @@ int enter_svm_guest_mode(struct vcpu_svm *svm, u64 vmcb_gpa,
>  {
>  	int ret;
>  
> -	svm->nested.vmcb = vmcb_gpa;
> +	svm->nested.vmcb_gpa = vmcb_gpa;
>  	load_nested_vmcb_control(svm, &nested_vmcb->control);
>  	nested_prepare_vmcb_save(svm, nested_vmcb);
>  	nested_prepare_vmcb_control(svm);
> @@ -568,7 +568,7 @@ int nested_svm_vmexit(struct vcpu_svm *svm)
>  	struct vmcb *vmcb = svm->vmcb;
>  	struct kvm_host_map map;
>  
> -	rc = kvm_vcpu_map(&svm->vcpu, gpa_to_gfn(svm->nested.vmcb), &map);
> +	rc = kvm_vcpu_map(&svm->vcpu, gpa_to_gfn(svm->nested.vmcb_gpa), &map);
>  	if (rc) {
>  		if (rc == -EINVAL)
>  			kvm_inject_gp(&svm->vcpu, 0);
> @@ -579,7 +579,7 @@ int nested_svm_vmexit(struct vcpu_svm *svm)
>  
>  	/* Exit Guest-Mode */
>  	leave_guest_mode(&svm->vcpu);
> -	svm->nested.vmcb = 0;
> +	svm->nested.vmcb_gpa = 0;
>  	WARN_ON_ONCE(svm->nested.nested_run_pending);
>  
>  	/* in case we halted in L2 */
> @@ -1018,7 +1018,7 @@ static int svm_get_nested_state(struct kvm_vcpu *vcpu,
>  
>  	/* First fill in the header and copy it out.  */
>  	if (is_guest_mode(vcpu)) {
> -		kvm_state.hdr.svm.vmcb_pa = svm->nested.vmcb;
> +		kvm_state.hdr.svm.vmcb_pa = svm->nested.vmcb_gpa;
>  		kvm_state.size += KVM_STATE_NESTED_SVM_VMCB_SIZE;
>  		kvm_state.flags |= KVM_STATE_NESTED_GUEST_MODE;
>  
> @@ -1128,7 +1128,7 @@ static int svm_set_nested_state(struct kvm_vcpu *vcpu,
>  	copy_vmcb_control_area(&hsave->control, &svm->vmcb->control);
>  	hsave->save = save;
>  
> -	svm->nested.vmcb = kvm_state->hdr.svm.vmcb_pa;
> +	svm->nested.vmcb_gpa = kvm_state->hdr.svm.vmcb_pa;
>  	load_nested_vmcb_control(svm, &ctl);
>  	nested_prepare_vmcb_control(svm);
>  
> diff --git a/arch/x86/kvm/svm/svm.c b/arch/x86/kvm/svm/svm.c
> index 562a79e3e63a..4338d2a2596e 100644
> --- a/arch/x86/kvm/svm/svm.c
> +++ b/arch/x86/kvm/svm/svm.c
> @@ -1102,7 +1102,7 @@ static void init_vmcb(struct vcpu_svm *svm)
>  	}
>  	svm->asid_generation = 0;
>  
> -	svm->nested.vmcb = 0;
> +	svm->nested.vmcb_gpa = 0;
>  	svm->vcpu.arch.hflags = 0;
>  
>  	if (!kvm_pause_in_guest(svm->vcpu.kvm)) {
> @@ -3884,7 +3884,7 @@ static int svm_pre_enter_smm(struct kvm_vcpu *vcpu, char *smstate)
>  		/* FED8h - SVM Guest */
>  		put_smstate(u64, smstate, 0x7ed8, 1);
>  		/* FEE0h - SVM Guest VMCB Physical Address */
> -		put_smstate(u64, smstate, 0x7ee0, svm->nested.vmcb);
> +		put_smstate(u64, smstate, 0x7ee0, svm->nested.vmcb_gpa);
>  
>  		svm->vmcb->save.rax = vcpu->arch.regs[VCPU_REGS_RAX];
>  		svm->vmcb->save.rsp = vcpu->arch.regs[VCPU_REGS_RSP];
> @@ -3903,17 +3903,18 @@ static int svm_pre_leave_smm(struct kvm_vcpu *vcpu, const char *smstate)
>  	struct vmcb *nested_vmcb;
>  	struct kvm_host_map map;
>  	u64 guest;
> -	u64 vmcb;
> +	u64 vmcb_gpa;
>  	int ret = 0;
>  
>  	guest = GET_SMSTATE(u64, smstate, 0x7ed8);
> -	vmcb = GET_SMSTATE(u64, smstate, 0x7ee0);
> +	vmcb_gpa = GET_SMSTATE(u64, smstate, 0x7ee0);
>  
>  	if (guest) {
> -		if (kvm_vcpu_map(&svm->vcpu, gpa_to_gfn(vmcb), &map) == -EINVAL)
> +		if (kvm_vcpu_map(&svm->vcpu, gpa_to_gfn(vmcb_gpa), &map) == -EINVAL)
>  			return 1;
> +
>  		nested_vmcb = map.hva;
> -		ret = enter_svm_guest_mode(svm, vmcb, nested_vmcb);
> +		ret = enter_svm_guest_mode(svm, vmcb_gpa, nested_vmcb);
>  		kvm_vcpu_unmap(&svm->vcpu, &map, true);
>  	}
>  
> diff --git a/arch/x86/kvm/svm/svm.h b/arch/x86/kvm/svm/svm.h
> index a798e1731709..03f2f082ef10 100644
> --- a/arch/x86/kvm/svm/svm.h
> +++ b/arch/x86/kvm/svm/svm.h
> @@ -85,7 +85,7 @@ struct svm_nested_state {
>  	struct vmcb *hsave;
>  	u64 hsave_msr;
>  	u64 vm_cr_msr;
> -	u64 vmcb;
> +	u64 vmcb_gpa;
>  	u32 host_intercept_exceptions;
>  
>  	/* These are the merged vectors */
> 

Please use vmcb12_gpa, and svm->nested.vmcb12 for the VMCB in patch 6.

(You probably also what to have local variables named vmcb12 in patch 6
to avoid too-long lines).

Paolo