lkml.org 
[lkml]   [2015]   [Apr]   [29]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [Xen-devel] [PATCH v3] xen: Suspend ticks on all CPUs during suspend
On 28/04/15 23:46, Boris Ostrovsky wrote:
> Commit 77e32c89a711 ("clockevents: Manage device's state separately for
> the core") decouples clockevent device's modes from states. With this
> change when a Xen guest tries to resume, it won't be calling its
> set_mode op which needs to be done on each VCPU in order to make the
> hypervisor aware that we are in oneshot mode.
>
> This happens because clockevents_tick_resume() (which is an intermediate
> step of resuming ticks on a processor) doesn't call clockevents_set_state()
> anymore and because during suspend clockevent devices on all VCPUs (except
> for the one doing the suspend) are left in ONESHOT state. As result, during
> resume the clockevents state machine will assume that device is already
> where it should be and doesn't need to be updated.
>
> To avoid this problem we should suspend ticks on all VCPUs during
> suspend.

Applied to for-linus-4.1b, thanks.

David


\
 
 \ /
  Last update: 2015-04-29 18:21    [W:0.092 / U:0.128 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site