lkml.org 
[lkml]   [2009]   [Jul]   [29]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH 04/12] kvm/svm: optimize nested vmrun
Date
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(-)

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;
--
1.6.3.3



\
 
 \ /
  Last update: 2009-07-29 15:03    [W:0.183 / U:0.144 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site