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kvm: mmu: don't set the present bit unconditionally

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To support execute only mappings on behalf of L1
hypervisors, we need to teach set_spte() to honor all three of
L1's XWR bits.  As a start, add a new variable "shadow_present_mask"
that will be set for non-EPT shadow paging and clear for EPT.

Signed-off-by: Bandan Das <bsd@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Bandan Das
2016-07-12 18:18:49 -04:00
committed by Paolo Bonzini
parent 812f30b234
commit ffb128c89b
4 changed files with 11 additions and 9 deletions
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arch/x86/include/asm/kvm_host.h
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@@ -1031,7 +1031,7 @@ void kvm_mmu_setup(struct kvm_vcpu *vcpu);
void kvm_mmu_init_vm(struct kvm *kvm);
void kvm_mmu_uninit_vm(struct kvm *kvm);
void kvm_mmu_set_mask_ptes(u64 user_mask, u64 accessed_mask,
u64 dirty_mask, u64 nx_mask, u64 x_mask);
u64 dirty_mask, u64 nx_mask, u64 x_mask, u64 p_mask);
void kvm_mmu_reset_context(struct kvm_vcpu *vcpu);
void kvm_mmu_slot_remove_write_access(struct kvm *kvm,