KVM: MMU: fix reserved bit check for ept=0/CR0.WP=0/CR4.SMEP=1/EFER.NX=0
KVM has special logic to handle pages with pte.u=1 and pte.w=0 when
CR0.WP=1. These pages' SPTEs flip continuously between two states:
U=1/W=0 (user and supervisor reads allowed, supervisor writes not allowed)
and U=0/W=1 (supervisor reads and writes allowed, user writes not allowed).
When SMEP is in effect, however, U=0 will enable kernel execution of
this page. To avoid this, KVM also sets NX=1 in the shadow PTE together
with U=0, making the two states U=1/W=0/NX=gpte.NX and U=0/W=1/NX=1.
When guest EFER has the NX bit cleared, the reserved bit check thinks
that the latter state is invalid; teach it that the smep_andnot_wp case
will also use the NX bit of SPTEs.
Cc: stable@vger.kernel.org
Reviewed-by: Xiao Guangrong <guangrong.xiao@linux.inel.com>
Fixes: c258b62b26
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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@ -3721,13 +3721,15 @@ static void reset_rsvds_bits_mask_ept(struct kvm_vcpu *vcpu,
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void
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reset_shadow_zero_bits_mask(struct kvm_vcpu *vcpu, struct kvm_mmu *context)
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{
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bool uses_nx = context->nx || context->base_role.smep_andnot_wp;
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/*
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* Passing "true" to the last argument is okay; it adds a check
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* on bit 8 of the SPTEs which KVM doesn't use anyway.
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*/
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__reset_rsvds_bits_mask(vcpu, &context->shadow_zero_check,
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boot_cpu_data.x86_phys_bits,
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context->shadow_root_level, context->nx,
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context->shadow_root_level, uses_nx,
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guest_cpuid_has_gbpages(vcpu), is_pse(vcpu),
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true);
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}
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