KVM: MMU: Disassociate direct maps from guest levels

Direct maps are linear translations for a section of memory, used for
real mode or with large pages.  As such, they are independent of the guest
levels.

Teach the mmu about this by making page->role.glevels = 0 for direct maps.
This allows direct maps to be shared among real mode and the various paging
modes.

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

1 files changed, 2 insertions, 0 deletions

diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c
index 83d2ebce9ea9..1cc60d3f445b 100644
--- a/arch/x86/kvm/mmu.c
+++ b/arch/x86/kvm/mmu.c
@@ -1329,6 +1329,8 @@ static struct kvm_mmu_page *kvm_mmu_get_page(struct kvm_vcpu *vcpu,
         role = vcpu->arch.mmu.base_role;
         role.level = level;
         role.direct = direct;
+        if (role.direct)
+                role.glevels = 0;
         role.access = access;
         if (vcpu->arch.mmu.root_level <= PT32_ROOT_LEVEL) {
                 quadrant = gaddr >> (PAGE_SHIFT + (PT64_PT_BITS * level));