Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756629Ab0GMCZ6 (ORCPT ); Mon, 12 Jul 2010 22:25:58 -0400 Received: from mx1.redhat.com ([209.132.183.28]:16482 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756520Ab0GMCZy (ORCPT ); Mon, 12 Jul 2010 22:25:54 -0400 From: Zachary Amsden To: KVM , Avi Kivity , Marcelo Tosatti , Glauber Costa Cc: Linux-kernel , Zachary Amsden , Avi Kivity , Marcelo Tosatti , Glauber Costa Subject: [PATCH 05/18] Warn about unstable TSC Date: Mon, 12 Jul 2010 16:25:25 -1000 Message-Id: <1278987938-23873-6-git-send-email-zamsden@redhat.com> In-Reply-To: <1278987938-23873-1-git-send-email-zamsden@redhat.com> References: <1278987938-23873-1-git-send-email-zamsden@redhat.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 955 Lines: 30 If creating an SMP guest with unstable host TSC, issue a warning Signed-off-by: Zachary Amsden --- 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 2d5b97a..36ef649 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -5449,6 +5449,10 @@ 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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/