KVM: MMU: Implement nested gva_to_gpa functions

This patch adds the functions to do a nested l2_gva to
l1_gpa page table walk.

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
Signed-off-by: Avi Kivity <avi@redhat.com>

1 files changed, 10 insertions, 0 deletions

diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index 1b3eb8a0a1bc..8ec3547c433d 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -296,6 +296,16 @@ struct kvm_vcpu_arch {
         struct kvm_mmu mmu;
 
         /*
+         * Paging state of an L2 guest (used for nested npt)
+         *
+         * This context will save all necessary information to walk page tables
+         * of the an L2 guest. This context is only initialized for page table
+         * walking and not for faulting since we never handle l2 page faults on
+         * the host.
+         */
+        struct kvm_mmu nested_mmu;
+
+        /*
          * Pointer to the mmu context currently used for
          * gva_to_gpa translations.
          */