From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1945968AbbEWUHO (ORCPT ); Sat, 23 May 2015 16:07:14 -0400 Received: from mx1.redhat.com ([209.132.183.28]:48565 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932279AbbEWUHM (ORCPT ); Sat, 23 May 2015 16:07:12 -0400 Date: Sat, 23 May 2015 17:06:29 -0300 From: Marcelo Tosatti To: Owen Hofmann , Paolo Bonzini Cc: KVM General , Paolo Bonzini , LKML , Sasha Levin Subject: [PATCH v2] KVM: x86: zero kvmclock_offset when vcpu0 initializes kvmclock system MSR Message-ID: <20150523200629.GA18207@amt.cnet> References: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.21 (2010-09-15) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Initialize kvmclock base, on kvmclock system MSR write time, so that the guest sees kvmclock counting from zero. This matches baremetal behaviour when kvmclock in guest sets sched clock stable. Signed-off-by: Marcelo Tosatti diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index cc2c759..ea40d24 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -2188,6 +2188,8 @@ int kvm_set_msr_common(struct kvm_vcpu *vcpu, struct msr_data *msr_info) &vcpu->requests); ka->boot_vcpu_runs_old_kvmclock = tmp; + + ka->kvmclock_offset = -get_kernel_ns(); } vcpu->arch.time = data;