linux-kernel - [PATCH 1/7] KVM: SVM: Keep seperate pointer to host-vmcb

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Date:	Wed, 13 Jul 2011 17:32:19 +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 <joro@...tes.org>
Subject: [PATCH 1/7] KVM: SVM: Keep seperate pointer to host-vmcb

From: Joerg Roedel <joro@...tes.org>

This patch introduces a new pointer which always points to
the VMCB used for running the L1 guest.

Signed-off-by: Joerg Roedel <joro@...tes.org>
---
 arch/x86/kvm/svm.c |    6 +++++-
 1 files changed, 5 insertions(+), 1 deletions(-)

diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
index 475d1c9..3d5990f 100644
--- a/arch/x86/kvm/svm.c
+++ b/arch/x86/kvm/svm.c
@@ -113,7 +113,9 @@ static u32 msrpm_offsets[MSRPM_OFFSETS] __read_mostly;
 struct vcpu_svm {
 	struct kvm_vcpu vcpu;
 	struct vmcb *vmcb;
+	struct vmcb *host_vmcb;
 	unsigned long vmcb_pa;
+	unsigned long host_vmcb_pa;
 	struct svm_cpu_data *svm_data;
 	uint64_t asid_generation;
 	uint64_t sysenter_esp;
@@ -1171,9 +1173,11 @@ static struct kvm_vcpu *svm_create_vcpu(struct kvm *kvm, unsigned int id)
 	svm->nested.msrpm = page_address(nested_msrpm_pages);
 	svm_vcpu_init_msrpm(svm->nested.msrpm);
 
-	svm->vmcb = page_address(page);
+	svm->host_vmcb = page_address(page);
+	svm->vmcb = svm->host_vmcb;
 	clear_page(svm->vmcb);
 	svm->vmcb_pa = page_to_pfn(page) << PAGE_SHIFT;
+	svm->host_vmcb_pa = page_to_pfn(page) << PAGE_SHIFT;
 	svm->asid_generation = 0;
 	init_vmcb(svm);
 	kvm_write_tsc(&svm->vcpu, 0);
-- 
1.7.4.1


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