On 24.08.2017 12:12, Paolo Bonzini wrote: > If the host has protection keys disabled, we cannot read and write the > guest PKRU---RDPKRU and WRPKRU fail with #GP(0) if CR4.PKE=0. Block > the PKU cpuid bit in that case. > > This ensures that guest_CR4.PKE=1 implies host_CR4.PKE=1. > > Fixes: 1be0e61c1f255faaeab04a390e00c8b9b9042870 > Signed-off-by: Paolo Bonzini <pbonz...@redhat.com> > --- > arch/x86/kvm/cpuid.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/arch/x86/kvm/cpuid.c b/arch/x86/kvm/cpuid.c > index 59ca2eea522c..19adbb418443 100644 > --- a/arch/x86/kvm/cpuid.c > +++ b/arch/x86/kvm/cpuid.c > @@ -469,7 +469,7 @@ static inline int __do_cpuid_ent(struct kvm_cpuid_entry2 > *entry, u32 function, > entry->ecx &= kvm_cpuid_7_0_ecx_x86_features; > cpuid_mask(&entry->ecx, CPUID_7_ECX); > /* PKU is not yet implemented for shadow paging. */ > - if (!tdp_enabled) > + if (!tdp_enabled || !boot_cpu_has(X86_FEATURE_OSPKE)) > entry->ecx &= ~F(PKU); > entry->edx &= kvm_cpuid_7_0_edx_x86_features; > entry->edx &= get_scattered_cpuid_leaf(7, 0, CPUID_EDX); >
Reviewed-by: David Hildenbrand <da...@redhat.com> -- Thanks, David
