linux-kernel - [PATCH 2/7] KVM: SVM: Use host_vmcb

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Date:	Wed, 13 Jul 2011 17:32:20 +0200
From:	Joerg Roedel <joerg.roedel@....com>
To:	Avi Kivity <avi@...hat.com>, Marcelo Tosatti <mtosatti@...hat.com>
CC:	<kvm@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	Joerg Roedel <joerg.roedel@....com>
Subject: [PATCH 2/7] KVM: SVM: Use host_vmcb_pa for vmload and vmsave

This saves copying over the vmload/vmsave switched part from
the host to the guest vmcb later.

Signed-off-by: Joerg Roedel <joerg.roedel@....com>
---
 arch/x86/kvm/svm.c |    7 ++++++-
 1 files changed, 6 insertions(+), 1 deletions(-)

diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
index 3d5990f..dc703ac 100644
--- a/arch/x86/kvm/svm.c
+++ b/arch/x86/kvm/svm.c
@@ -3704,9 +3704,13 @@ static void svm_vcpu_run(struct kvm_vcpu *vcpu)
 
 		/* Enter guest mode */
 		"push %%"R"ax \n\t"
-		"mov %c[vmcb](%[svm]), %%"R"ax \n\t"
+		"mov %c[host_vmcb](%[svm]), %%"R"ax \n\t"
 		__ex(SVM_VMLOAD) "\n\t"
+		"mov (%%"R"sp), %%"R"ax\n\t"
+		"mov %c[vmcb](%[svm]), %%"R"ax \n\t"
 		__ex(SVM_VMRUN) "\n\t"
+		"mov (%%"R"sp), %%"R"ax\n\t"
+		"mov %c[host_vmcb](%[svm]), %%"R"ax \n\t"
 		__ex(SVM_VMSAVE) "\n\t"
 		"pop %%"R"ax \n\t"
 
@@ -3731,6 +3735,7 @@ static void svm_vcpu_run(struct kvm_vcpu *vcpu)
 		:
 		: [svm]"a"(svm),
 		  [vmcb]"i"(offsetof(struct vcpu_svm, vmcb_pa)),
+		  [host_vmcb]"i"(offsetof(struct vcpu_svm, host_vmcb_pa)),
 		  [rbx]"i"(offsetof(struct vcpu_svm, vcpu.arch.regs[VCPU_REGS_RBX])),
 		  [rcx]"i"(offsetof(struct vcpu_svm, vcpu.arch.regs[VCPU_REGS_RCX])),
 		  [rdx]"i"(offsetof(struct vcpu_svm, vcpu.arch.regs[VCPU_REGS_RDX])),
-- 
1.7.4.1


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