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KVM: MMU: Allow spte.w=1 for gpte.w=0 and cr0.wp=0 only in shadow mode

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When tdp is enabled, the guest's cr0.wp shouldn't have any effect on spte
permissions.

Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Avi Kivity 2010-05-27 14:22:51 +03:00
parent 10ab25cd6b
commit 8184dd38e2
1 changed files with 2 additions and 1 deletions
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3
arch/x86/kvm/mmu.c
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@ -1882,7 +1882,8 @@ static int set_spte(struct kvm_vcpu *vcpu, u64 *sptep,
spte |= (u64)pfn << PAGE_SHIFT; spte |= (u64)pfn << PAGE_SHIFT;
if ((pte_access & ACC_WRITE_MASK) if ((pte_access & ACC_WRITE_MASK)
|| (write_fault && !is_write_protection(vcpu) && !user_fault)) { || (!tdp_enabled && write_fault && !is_write_protection(vcpu)
&& !user_fault)) {
if (level > PT_PAGE_TABLE_LEVEL && if (level > PT_PAGE_TABLE_LEVEL &&
has_wrprotected_page(vcpu->kvm, gfn, level)) { has_wrprotected_page(vcpu->kvm, gfn, level)) {