KVM: MMU: Introduce inject_page_fault function pointer

This patch introduces an inject_page_fault function pointer
into struct kvm_mmu which will be used to inject a page
fault. This will be used later when Nested Nested Paging is
implemented.
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
Signed-off-by: Avi Kivity <avi@redhat.com>

arch/x86/include/asm/kvm_host.h

@@ -239,6 +239,9 @@ struct kvm_mmu {
 	void (*set_cr3)(struct kvm_vcpu *vcpu, unsigned long root);
 	unsigned long (*get_cr3)(struct kvm_vcpu *vcpu);
 	int (*page_fault)(struct kvm_vcpu *vcpu, gva_t gva, u32 err);
+	void (*inject_page_fault)(struct kvm_vcpu *vcpu,
+				  unsigned long addr,
+				  u32 error_code);
 	void (*free)(struct kvm_vcpu *vcpu);
 	gpa_t (*gva_to_gpa)(struct kvm_vcpu *vcpu, gva_t gva, u32 access,
 			    u32 *error);

arch/x86/kvm/mmu.c

@@ -2571,7 +2571,7 @@ static void inject_page_fault(struct kvm_vcpu *vcpu,
 			      u64 addr,
 			      u32 err_code)
 {
-	kvm_inject_page_fault(vcpu, addr, err_code);
+	vcpu->arch.mmu.inject_page_fault(vcpu, addr, err_code);
 }
 
 static void paging_free(struct kvm_vcpu *vcpu)
@@ -2721,6 +2721,7 @@ static int init_kvm_tdp_mmu(struct kvm_vcpu *vcpu)
 	context->direct_map = true;
 	context->set_cr3 = kvm_x86_ops->set_tdp_cr3;
 	context->get_cr3 = get_cr3;
+	context->inject_page_fault = kvm_inject_page_fault;
 
 	if (!is_paging(vcpu)) {
 		context->gva_to_gpa = nonpaging_gva_to_gpa;
@@ -2762,6 +2763,7 @@ static int init_kvm_softmmu(struct kvm_vcpu *vcpu)
 	vcpu->arch.mmu.base_role.cr0_wp  = is_write_protection(vcpu);
 	vcpu->arch.mmu.set_cr3           = kvm_x86_ops->set_cr3;
 	vcpu->arch.mmu.get_cr3           = get_cr3;
+	vcpu->arch.mmu.inject_page_fault = kvm_inject_page_fault;
 
 	return r;
 }