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KVM: MMU: Disassociate direct maps from guest levels

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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>
This commit is contained in:
Avi Kivity 2010-03-14 10:16:40 +02:00
parent f815bce894
commit 84b0c8c6a6
1 changed files with 2 additions and 0 deletions
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2
arch/x86/kvm/mmu.c
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@ -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));