KVM: x86: block guest protection keys unless the host has them enabled

commit c469268cd523245cc58255f6696e0c295485cb0b upstream.

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
Reviewed-by: David Hildenbrand <david@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/arch/x86/kvm/cpuid.c b/arch/x86/kvm/cpuid.c
index 649d8f2c1e40426f8efa2aa0ab5b483a7365c62a..91af75e37306819f3897a95373ac51aecd73b01d 100644 (file)
--- a/arch/x86/kvm/cpuid.c
+++ b/arch/x86/kvm/cpuid.c
@@ -456,7 +456,7 @@ 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);
                } else {
                        entry->ebx = 0;