KVM: MMU: Disassociate direct maps from guest levels
authorAvi Kivity <avi@redhat.com>
Sun, 14 Mar 2010 08:16:40 +0000 (10:16 +0200)
committerAvi Kivity <avi@redhat.com>
Mon, 17 May 2010 09:16:44 +0000 (12:16 +0300)
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>
arch/x86/kvm/mmu.c

index 83d2ebce9ea983b58e8d335ee4f658932651271d..1cc60d3f445b9b2968c2f848e6fe4d591c34bc0d 100644 (file)
@@ -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));