linux/drivers/xen/events
Juergen Gross 867cefb4cb xen: Fix x86 sched_clock() interface for xen
Commit f94c8d1169 ("sched/clock, x86/tsc: Rework the x86 'unstable'
sched_clock() interface") broke Xen guest time handling across
migration:

[  187.249951] Freezing user space processes ... (elapsed 0.001 seconds) done.
[  187.251137] OOM killer disabled.
[  187.251137] Freezing remaining freezable tasks ... (elapsed 0.001 seconds) done.
[  187.252299] suspending xenstore...
[  187.266987] xen:grant_table: Grant tables using version 1 layout
[18446743811.706476] OOM killer enabled.
[18446743811.706478] Restarting tasks ... done.
[18446743811.720505] Setting capacity to 16777216

Fix that by setting xen_sched_clock_offset at resume time to ensure a
monotonic clock value.

[boris: replaced pr_info() with pr_info_once() in xen_callback_vector()
 to avoid printing with incorrect timestamp during resume (as we
 haven't re-adjusted the clock yet)]

Fixes: f94c8d1169 ("sched/clock, x86/tsc: Rework the x86 'unstable' sched_clock() interface")
Cc: <stable@vger.kernel.org> # 4.11
Reported-by: Hans van Kranenburg <hans.van.kranenburg@mendix.com>
Signed-off-by: Juergen Gross <jgross@suse.com>
Tested-by: Hans van Kranenburg <hans.van.kranenburg@mendix.com>
Signed-off-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
2019-01-16 13:06:05 -05:00
..
events_2l.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
events_base.c xen: Fix x86 sched_clock() interface for xen 2019-01-16 13:06:05 -05:00
events_fifo.c xen/events: events_fifo: Don't use {get,put}_cpu() in xen_evtchn_fifo_init() 2017-08-31 09:45:55 -04:00
events_internal.h Revert "xen/events/fifo: Handle linked events when closing a port" 2015-08-11 11:05:42 +01:00
Makefile xen/events: use the FIFO-based ABI if available 2014-01-06 10:07:57 -05:00