KVM: x86: Tell the guest we'll warn it about tsc stability

This patch puts up the flag that tells the guest that we'll warn it
about the tsc being trustworthy or not. By now, we also say
it is not.

Signed-off-by: Glauber Costa <glommer@redhat.com>
Acked-by: Zachary Amsden <zamsden@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 419c4512e270d1476e5ac4646eb30d75db8aea4a..474a27fc42df252aac95cf07835b017393ba7179 100644 (file)
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -857,6 +857,8 @@ static void kvm_write_guest_time(struct kvm_vcpu *v)
        vcpu->hv_clock.system_time = ts.tv_nsec +
                                     (NSEC_PER_SEC * (u64)ts.tv_sec) + v->kvm->arch.kvmclock_offset;
 
+       vcpu->hv_clock.flags = 0;
+
        /*
         * The interface expects us to write an even number signaling that the
         * update is finished. Since the guest won't see the intermediate
@@ -1984,7 +1986,8 @@ static void do_cpuid_ent(struct kvm_cpuid_entry2 *entry, u32 function,
        case KVM_CPUID_FEATURES:
                entry->eax = (1 << KVM_FEATURE_CLOCKSOURCE) |
                             (1 << KVM_FEATURE_NOP_IO_DELAY) |
-                            (1 << KVM_FEATURE_CLOCKSOURCE2);
+                            (1 << KVM_FEATURE_CLOCKSOURCE2) |
+                            (1 << KVM_FEATURE_CLOCKSOURCE_STABLE_BIT);
                entry->ebx = 0;
                entry->ecx = 0;
                entry->edx = 0;