diff mbox

[04/12] kvm/svm: optimize nested vmrun

Message ID 1248872192-30881-5-git-send-email-joerg.roedel@amd.com (mailing list archive)
State New, archived
Headers show

Commit Message

Joerg Roedel July 29, 2009, 12:56 p.m. UTC 
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>
---
 arch/x86/kvm/svm.c |   26 ++++++++++++++++++++------
 1 files changed, 20 insertions(+), 6 deletions(-)

Comments

Alexander Graf July 29, 2009, 1:27 p.m. UTC | #1 
Joerg Roedel wrote:
> 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>

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diff mbox

Patch

diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
index 3e794f0..b85da3f 100644
--- a/arch/x86/kvm/svm.c
+++ b/arch/x86/kvm/svm.c
@@ -1688,6 +1688,7 @@  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;
@@ -1698,12 +1699,25 @@  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;