KVM: Make EFER reads safe when EFER does not exist
Some processors don't have EFER; don't oops if userspace wants us to read EFER when we check NX. Cc: stable@kernel.org Signed-off-by: Avi Kivity <avi@redhat.com>
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@ -1121,9 +1121,9 @@ void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu)
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static int is_efer_nx(void)
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{
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u64 efer;
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unsigned long long efer = 0;
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rdmsrl(MSR_EFER, efer);
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rdmsrl_safe(MSR_EFER, &efer);
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return efer & EFER_NX;
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}
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