On Sun, Mar 14, 2010 at 10:22:52AM +0200, Avi Kivity wrote:
> 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@xxxxxxxxxx>
> ---
> arch/x86/kvm/mmu.c | 2 ++
> 1 files changed, 2 insertions(+), 0 deletions(-)
>
> diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c
> index b137515..a984bc1 100644
> --- a/arch/x86/kvm/mmu.c
> +++ b/arch/x86/kvm/mmu.c
> @@ -1328,6 +1328,8 @@ 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));
> --
> 1.7.0.2
Isnt this what happens already, since for tdp base_role.glevels is not
initialized?
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