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KVM: SVM: optimize nested vmrun 

Only copy the necessary parts of the vmcb save area on vmrun and save
precious time.

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
Acked-by: Alexander Graf <agraf@suse.de>
Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Joerg Roedel 2009-08-07 11:49:30 +02:00 committed by Avi Kivity
parent 33740e4009
commit defbba5660
1 changed files with 21 additions and 7 deletions
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28
arch/x86/kvm/svm.c
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@ -1681,6 +1681,7 @@ static int nested_svm_vmrun(struct vcpu_svm *svm, void *arg1,
{
struct vmcb *nested_vmcb = (struct vmcb *)arg1;
struct vmcb *hsave = svm->hsave;
struct vmcb *vmcb = svm->vmcb;
/* nested_vmcb is our indicator if nested SVM is activated */
svm->nested_vmcb = svm->vmcb->save.rax;
@ -1691,12 +1692,25 @@ static int nested_svm_vmrun(struct vcpu_svm *svm, void *arg1,
/* Save the old vmcb, so we don't need to pick what we save, but
can restore everything when a VMEXIT occurs */
memcpy(hsave, svm->vmcb, sizeof(struct vmcb));
/* We need to remember the original CR3 in the SPT case */
if (!npt_enabled)
hsave->save.cr3 = svm->vcpu.arch.cr3;
hsave->save.cr4 = svm->vcpu.arch.cr4;
hsave->save.rip = svm->next_rip;
hsave->save.es = vmcb->save.es;
hsave->save.cs = vmcb->save.cs;
hsave->save.ss = vmcb->save.ss;
hsave->save.ds = vmcb->save.ds;
hsave->save.gdtr = vmcb->save.gdtr;
hsave->save.idtr = vmcb->save.idtr;
hsave->save.efer = svm->vcpu.arch.shadow_efer;
hsave->save.cr0 = svm->vcpu.arch.cr0;
hsave->save.cr4 = svm->vcpu.arch.cr4;
hsave->save.rflags = vmcb->save.rflags;
hsave->save.rip = svm->next_rip;
hsave->save.rsp = vmcb->save.rsp;
hsave->save.rax = vmcb->save.rax;
if (npt_enabled)
hsave->save.cr3 = vmcb->save.cr3;
else
hsave->save.cr3 = svm->vcpu.arch.cr3;
hsave->control = vmcb->control;
if (svm->vmcb->save.rflags & X86_EFLAGS_IF)
svm->vcpu.arch.hflags |= HF_HIF_MASK;
@ -1721,7 +1735,7 @@ static int nested_svm_vmrun(struct vcpu_svm *svm, void *arg1,
kvm_set_cr3(&svm->vcpu, nested_vmcb->save.cr3);
kvm_mmu_reset_context(&svm->vcpu);
}
svm->vmcb->save.cr2 = nested_vmcb->save.cr2;
svm->vmcb->save.cr2 = svm->vcpu.arch.cr2 = nested_vmcb->save.cr2;
kvm_register_write(&svm->vcpu, VCPU_REGS_RAX, nested_vmcb->save.rax);
kvm_register_write(&svm->vcpu, VCPU_REGS_RSP, nested_vmcb->save.rsp);
kvm_register_write(&svm->vcpu, VCPU_REGS_RIP, nested_vmcb->save.rip);