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From: Joerg Roedel on 3 Mar 2010 14:20
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(a)amd.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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Prev: [BUG #15248] Please apply the suggested fix
Next: [PATCH 18/18] KVM: X86: Add KVM_CAP_SVM_CPUID_FIXED