From: Denis Plotnikov <dplotnikov@virtuozzo.com>
To: kvm@vger.kernel.org, rkrcmar@redhat.com
Cc: pbonzini@redhat.com, den@virtuozzo.com, rkagan@virtuozzo.com
Subject: [PATCH v2 04/11] TSC: write cycles stamp value to input pointer
Date: Fri, 21 Jul 2017 18:45:11 +0300 [thread overview]
Message-ID: <1500651918-14156-5-git-send-email-dplotnikov@virtuozzo.com> (raw)
In-Reply-To: <1500651918-14156-1-git-send-email-dplotnikov@virtuozzo.com>
This allows to get cycles stamp used for time calculation when
clocksource is tsc
Signed-off-by: Denis Plotnikov <dplotnikov@virtuozzo.com>
---
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
next prev parent reply other threads:[~2017-07-21 15:45 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-07-21 15:45 [PATCH v2 00/11] make L2's kvm-clock stable, get rid of pvclock_gtod Denis Plotnikov
2017-07-21 15:45 ` [PATCH v2 01/11] timekeeper: change interface of clocksource reding functions Denis Plotnikov
2017-07-23 4:24 ` kbuild test robot
2017-07-21 15:45 ` [PATCH v2 02/11] pvclock: write cycle stamp value if a pointer given Denis Plotnikov
2017-07-21 15:45 ` [PATCH v2 03/11] kvmclock: pass cycles pointer to the changed pvclock interface Denis Plotnikov
2017-07-21 15:45 ` Denis Plotnikov [this message]
2017-07-21 15:45 ` [PATCH v2 05/11] timekeeping: change ktime_get_with_offset interface to accept cycles pointer Denis Plotnikov
2017-07-21 15:45 ` [PATCH v2 06/11] timekeeping: add functions returning cycle stamp counter along with time Denis Plotnikov
2017-07-21 15:45 ` [PATCH v2 07/11] timekeeper: add clocksource change notifier Denis Plotnikov
2017-07-21 15:45 ` [PATCH v2 08/11] timekeeper: add a couple of the core timekeeper reading helpers Denis Plotnikov
2017-07-23 4:02 ` kbuild test robot
2017-07-23 4:02 ` kbuild test robot
2017-07-21 15:45 ` [PATCH v2 09/11] KVM: get rid of pv_clock_gtod Denis Plotnikov
2017-07-25 10:37 ` Paolo Bonzini
2017-07-21 15:45 ` [PATCH v2 10/11] pvclock: add clocksource change notification on changing of tsc stable bit Denis Plotnikov
2017-07-21 15:45 ` [PATCH v2 11/11] KVM: add pvclock to a list of stable clocks Denis Plotnikov
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