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Subject[PATCH 07/22] KVM: SVM: Implement MMU helper functions for Nested Nested Paging
Date
This patch adds the helper functions which will be used in
the mmu context for handling nested nested page faults.

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
---
arch/x86/kvm/svm.c | 33 +++++++++++++++++++++++++++++++++
1 files changed, 33 insertions(+), 0 deletions(-)
diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
index 4aae4be..e31f601 100644
--- a/arch/x86/kvm/svm.c
+++ b/arch/x86/kvm/svm.c
@@ -92,6 +92,9 @@ struct nested_state {
u32 intercept_exceptions;
u64 intercept;

+ /* Nested Paging related state */
+ u64 nested_cr3;
+
};

#define MSRPM_OFFSETS 16
@@ -1490,6 +1493,36 @@ static int vmmcall_interception(struct vcpu_svm *svm)
return 1;
}

+static unsigned long nested_svm_get_tdp_cr3(struct kvm_vcpu *vcpu)
+{
+ struct vcpu_svm *svm = to_svm(vcpu);
+
+ return svm->nested.nested_cr3;
+}
+
+static void nested_svm_set_tdp_cr3(struct kvm_vcpu *vcpu,
+ unsigned long root)
+{
+ struct vcpu_svm *svm = to_svm(vcpu);
+
+ svm->vmcb->control.nested_cr3 = root;
+ force_new_asid(vcpu);
+}
+
+static void nested_svm_inject_npf_exit(struct kvm_vcpu *vcpu,
+ unsigned long addr,
+ u32 error_code)
+{
+ struct vcpu_svm *svm = to_svm(vcpu);
+
+ svm->vmcb->control.exit_code = SVM_EXIT_NPF;
+ svm->vmcb->control.exit_code_hi = 0;
+ svm->vmcb->control.exit_info_1 = error_code;
+ svm->vmcb->control.exit_info_2 = addr;
+
+ nested_svm_vmexit(svm);
+}
+
static int nested_svm_check_permissions(struct vcpu_svm *svm)
{
if (!(svm->vcpu.arch.efer & EFER_SVME)
--
1.7.0.4



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