From mboxrd@z Thu Jan 1 00:00:00 1970 From: Denis Plotnikov Subject: [PATCH v2 04/11] TSC: write cycles stamp value to input pointer Date: Fri, 21 Jul 2017 18:45:11 +0300 Message-ID: <1500651918-14156-5-git-send-email-dplotnikov@virtuozzo.com> References: <1500651918-14156-1-git-send-email-dplotnikov@virtuozzo.com> Cc: pbonzini@redhat.com, den@virtuozzo.com, rkagan@virtuozzo.com To: kvm@vger.kernel.org, rkrcmar@redhat.com Return-path: Received: from mailhub.sw.ru ([195.214.232.25]:3759 "EHLO relay.sw.ru" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754489AbdGUPpf (ORCPT ); Fri, 21 Jul 2017 11:45:35 -0400 In-Reply-To: <1500651918-14156-1-git-send-email-dplotnikov@virtuozzo.com> Sender: kvm-owner@vger.kernel.org List-ID: This allows to get cycles stamp used for time calculation when clocksource is tsc Signed-off-by: Denis Plotnikov --- arch/x86/kernel/tsc.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/arch/x86/kernel/tsc.c b/arch/x86/kernel/tsc.c index b475f6c..5411b18 100644 --- a/arch/x86/kernel/tsc.c +++ b/arch/x86/kernel/tsc.c @@ -1112,7 +1112,11 @@ static void tsc_resume(struct clocksource *cs) */ static u64 read_tsc(struct clocksource *cs, u64 *cycles_stamp) { - return (u64)rdtsc_ordered(); + u64 tsc = rdtsc_ordered(); + + if (cycles_stamp) + *cycles_stamp = tsc; + return tsc; } static void tsc_cs_mark_unstable(struct clocksource *cs) -- 2.7.4