Commit 5bd2edc3 authored by Joerg Roedel's avatar Joerg Roedel Committed by Avi Kivity
Browse files

KVM: SVM: Implement MMU helper functions for Nested Nested Paging 



This patch adds the helper functions which will be used in
the mmu context for handling nested nested page faults.

Signed-off-by: default avatarJoerg Roedel <joerg.roedel@amd.com>
Signed-off-by: default avatarAvi Kivity <avi@redhat.com>
parent 2d48a985

arch/x86/kvm/svm.c

+30 −0
Original line number Diff line number Diff line
@@ -104,6 +104,8 @@ struct nested_state { 
	u32 intercept_exceptions;

	u64 intercept;



	/* Nested Paging related state */

	u64 nested_cr3;

};



#define MSRPM_OFFSETS	16
@@ -1600,6 +1602,34 @@ 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)

{

	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 = vcpu->arch.fault.error_code;

	svm->vmcb->control.exit_info_2 = vcpu->arch.fault.address;



	nested_svm_vmexit(svm);

}



static int nested_svm_check_permissions(struct vcpu_svm *svm)

{

	if (!(svm->vcpu.arch.efer & EFER_SVME)