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KVM: SVM: Drop vcpu_svm.vmcb_pa

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Remove vmcb_pa from vcpu_svm and simply read current_vmcb->pa directly in
the one path where it is consumed.  Unlike svm->vmcb, use of the current
vmcb's address is very limited, as evidenced by the fact that its use
can be trimmed to a single dereference.

Opportunistically add a comment about using vmcb01 for VMLOAD/VMSAVE, at
first glance using vmcb01 instead of vmcb_pa looks wrong.

No functional change intended.

Cc: Maxim Levitsky <mlevitsk@redhat.com>
Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-Id: <20210406171811.4043363-3-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Sean Christopherson 2021-04-06 10:18:09 -07:00 committed by Paolo Bonzini
parent 17e5e964ee
commit d1788191fd
2 changed files with 9 additions and 4 deletions
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12
arch/x86/kvm/svm/svm.c
View file

@ -1310,7 +1310,6 @@ void svm_switch_vmcb(struct vcpu_svm *svm, struct kvm_vmcb_info *target_vmcb)
{
svm->current_vmcb = target_vmcb;
svm->vmcb = target_vmcb->ptr;
svm->vmcb_pa = target_vmcb->pa;
}
static int svm_create_vcpu(struct kvm_vcpu *vcpu)
@ -3704,6 +3703,7 @@ static fastpath_t svm_exit_handlers_fastpath(struct kvm_vcpu *vcpu)
static noinstr void svm_vcpu_enter_exit(struct kvm_vcpu *vcpu)
{
struct vcpu_svm *svm = to_svm(vcpu);
unsigned long vmcb_pa = svm->current_vmcb->pa;
/*
* VMENTER enables interrupts (host state), but the kernel state is
@ -3726,12 +3726,18 @@ static noinstr void svm_vcpu_enter_exit(struct kvm_vcpu *vcpu)
lockdep_hardirqs_on(CALLER_ADDR0);
if (sev_es_guest(vcpu->kvm)) {
__svm_sev_es_vcpu_run(svm->vmcb_pa);
__svm_sev_es_vcpu_run(vmcb_pa);
} else {
struct svm_cpu_data *sd = per_cpu(svm_data, vcpu->cpu);
/*
* Use a single vmcb (vmcb01 because it's always valid) for
* context switching guest state via VMLOAD/VMSAVE, that way
* the state doesn't need to be copied between vmcb01 and
* vmcb02 when switching vmcbs for nested virtualization.
*/
vmload(svm->vmcb01.pa);
__svm_vcpu_run(svm->vmcb_pa, (unsigned long *)&vcpu->arch.regs);
__svm_vcpu_run(vmcb_pa, (unsigned long *)&vcpu->arch.regs);
vmsave(svm->vmcb01.pa);
vmload(__sme_page_pa(sd->save_area));

1
arch/x86/kvm/svm/svm.h
View file

@ -111,7 +111,6 @@ struct svm_nested_state {
struct vcpu_svm {
struct kvm_vcpu vcpu;
struct vmcb *vmcb;
unsigned long vmcb_pa;
struct kvm_vmcb_info vmcb01;
struct kvm_vmcb_info *current_vmcb;
struct svm_cpu_data *svm_data;