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KVM: MMU: shadow nested paging does not have PKU

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commit 28f091bc2f upstream.

Initialize the mask for PKU permissions as if CR4.PKE=0, avoiding
incorrect interpretations of the nested hypervisor's page tables.

Cc: stable@vger.kernel.org
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Paolo Bonzini
2021-11-22 13:01:37 -05:00
committed by Greg Kroah-Hartman
parent 9325b1dbdb
commit 87d9c628be
1 changed files with 2 additions and 2 deletions
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4
arch/x86/kvm/mmu/mmu.c
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@@ -4852,7 +4852,7 @@ void kvm_init_shadow_npt_mmu(struct kvm_vcpu *vcpu, unsigned long cr0,
struct kvm_mmu *context = &vcpu->arch.guest_mmu;
struct kvm_mmu_role_regs regs = {
.cr0 = cr0,
.cr4 = cr4,
.cr4 = cr4 & ~X86_CR4_PKE,
.efer = efer,
};
union kvm_mmu_role new_role;
@@ -4916,7 +4916,7 @@ void kvm_init_shadow_ept_mmu(struct kvm_vcpu *vcpu, bool execonly,
context->direct_map = false;
update_permission_bitmask(context, true);
update_pkru_bitmask(context);
context->pkru_mask = 0;
reset_rsvds_bits_mask_ept(vcpu, context, execonly);
reset_ept_shadow_zero_bits_mask(vcpu, context, execonly);
}