linux-kernel - [PATCH 03/18] KVM: MMU: Make set_cr3 a function pointer in kvm

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Date:	Wed, 3 Mar 2010 20:12:06 +0100
From:	Joerg Roedel <joerg.roedel@....com>
To:	Avi Kivity <avi@...hat.com>, Marcelo Tosatti <mtosatti@...hat.com>
CC:	Alexander Graf <agraf@...e.de>, kvm@...r.kernel.org,
	linux-kernel@...r.kernel.org, Joerg Roedel <joerg.roedel@....com>
Subject: [PATCH 03/18] KVM: MMU: Make set_cr3 a function pointer in kvm_mmu

This is necessary to implement Nested Nested Paging. As a
side effect this allows some cleanups in the SVM nested
paging code.

Signed-off-by: Joerg Roedel <joerg.roedel@....com>
---
 arch/x86/include/asm/kvm_host.h |    1 +
 arch/x86/kvm/mmu.c              |    4 +++-
 2 files changed, 4 insertions(+), 1 deletions(-)

diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index e7bef19..887a1f7 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -241,6 +241,7 @@ struct kvm_pio_request {
  */
 struct kvm_mmu {
 	void (*new_cr3)(struct kvm_vcpu *vcpu);
+	void (*set_cr3)(struct kvm_vcpu *vcpu, unsigned long root);
 	int (*page_fault)(struct kvm_vcpu *vcpu, gva_t gva, u32 err);
 	void (*free)(struct kvm_vcpu *vcpu);
 	gpa_t (*gva_to_gpa)(struct kvm_vcpu *vcpu, gva_t gva, u32 access,
diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c
index 5c66c99..ec3da11 100644
--- a/arch/x86/kvm/mmu.c
+++ b/arch/x86/kvm/mmu.c
@@ -2398,6 +2398,7 @@ static int init_kvm_tdp_mmu(struct kvm_vcpu *vcpu)
 	context->shadow_root_level = kvm_x86_ops->get_tdp_level();
 	context->root_hpa = INVALID_PAGE;
 	vcpu->arch.mmu.tdp_enabled = true;
+	vcpu->arch.mmu.set_cr3 = kvm_x86_ops->set_cr3;
 
 	if (!is_paging(vcpu)) {
 		context->gva_to_gpa = nonpaging_gva_to_gpa;
@@ -2437,6 +2438,7 @@ static int init_kvm_softmmu(struct kvm_vcpu *vcpu)
 
 	vcpu->arch.mmu.base_role.glevels = vcpu->arch.mmu.root_level;
 	vcpu->arch.mmu.tdp_enabled       = false;
+	vcpu->arch.mmu.set_cr3           = kvm_x86_ops->set_cr3;
 
 	return r;
 }
@@ -2482,7 +2484,7 @@ int kvm_mmu_load(struct kvm_vcpu *vcpu)
 	if (r)
 		goto out;
 	/* set_cr3() should ensure TLB has been flushed */
-	kvm_x86_ops->set_cr3(vcpu, vcpu->arch.mmu.root_hpa);
+	vcpu->arch.mmu.set_cr3(vcpu, vcpu->arch.mmu.root_hpa);
 out:
 	return r;
 }
-- 
1.7.0


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