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    Subject[PATCH 06/18] Warn about unstable TSC
    Date
    If creating an SMP guest with unstable host TSC, issue a warning

    Signed-off-by: Zachary Amsden <zamsden@redhat.com>
    ---
    arch/x86/kvm/x86.c | 4 ++++
    1 files changed, 4 insertions(+), 0 deletions(-)

    diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
    index 273dd7d..045b2d6 100644
    --- a/arch/x86/kvm/x86.c
    +++ b/arch/x86/kvm/x86.c
    @@ -5458,6 +5458,10 @@ void kvm_arch_vcpu_free(struct kvm_vcpu *vcpu)
    struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm,
    unsigned int id)
    {
    + if (check_tsc_unstable() && id != 0)
    + printk_once(KERN_WARNING
    + "kvm: SMP vm created on host with unstable TSC; "
    + "guest TSC will not be reliable\n");
    return kvm_x86_ops->vcpu_create(kvm, id);
    }

    --
    1.7.1


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