KVM: x86: Allow ARAT CPU feature

There is no reason to deny this feature to guests. We are emulating the
APIC timer, thus are exposing it without stops in power-saving states.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

diff --git a/arch/x86/kvm/cpuid.c b/arch/x86/kvm/cpuid.c
index 92a74a0428aa06f2568e17fb8cd1eaa472c850cb..9dadf8d67873b85433df57f50baf4e602bbcc44b 100644 (file)
--- a/arch/x86/kvm/cpuid.c
+++ b/arch/x86/kvm/cpuid.c
@@ -415,6 +415,12 @@ static inline int __do_cpuid_ent(struct kvm_cpuid_entry2 *entry, u32 function,
                }
                break;
        }
+       case 6: /* Thermal management */
+               entry->eax = 0x4; /* allow ARAT */
+               entry->ebx = 0;
+               entry->ecx = 0;
+               entry->edx = 0;
+               break;
        case 7: {
                entry->flags |= KVM_CPUID_FLAG_SIGNIFCANT_INDEX;
                /* Mask ebx against host capability word 9 */
@@ -591,7 +597,6 @@ static inline int __do_cpuid_ent(struct kvm_cpuid_entry2 *entry, u32 function,
                break;
        case 3: /* Processor serial number */
        case 5: /* MONITOR/MWAIT */
-       case 6: /* Thermal management */
        case 0xC0000002:
        case 0xC0000003:
        case 0xC0000004: