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@amd.com>
Signed-off-by: Avi Kivity <avi@redhat.com>

2 files changed, 5 insertions, 2 deletions

diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index 80ef28bddcc3..53cedede88fa 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -236,6 +236,7 @@ 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 5c28e979d730..c8acb9609ca4 100644
--- a/arch/x86/kvm/mmu.c
+++ b/arch/x86/kvm/mmu.c
@@ -2714,6 +2714,7 @@ 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;
         context->direct_map = true;
+        context->set_cr3 = kvm_x86_ops->set_cr3;
 
         if (!is_paging(vcpu)) {
                 context->gva_to_gpa = nonpaging_gva_to_gpa;
@@ -2752,7 +2753,8 @@ static int init_kvm_softmmu(struct kvm_vcpu *vcpu)
                 r = paging32_init_context(vcpu);
 
         vcpu->arch.mmu.base_role.cr4_pae = !!is_pae(vcpu);
-        vcpu->arch.mmu.base_role.cr0_wp = is_write_protection(vcpu);
+        vcpu->arch.mmu.base_role.cr0_wp  = is_write_protection(vcpu);
+        vcpu->arch.mmu.set_cr3           = kvm_x86_ops->set_cr3;
 
         return r;
 }
@@ -2796,7 +2798,7 @@ 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;
 }