lkml.org 
[lkml]   [2016]   [Sep]   [13]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
From
SubjectRe: powerpc: set used_vsr/used_vr/used_spe in sigreturn path when MSR bits are active
Date
On Tue, 2016-26-07 at 08:06:01 UTC, Simon Guo wrote:
> From: Simon Guo <wei.guo.simon@gmail.com>
>
> Normally, when MSR[VSX/VR/SPE] bits = 1, the used_vsr/used_vr/used_spe
> bit have already been set. However signal frame locates at user space
> and it is controlled by user application. It is up to kernel to make
> sure used_vsr/used_vr/used_spe(in kernel)=1 and consistent with MSR
> bits.
>
> For example, CRIU application, who utilizes sigreturn to restore
> checkpointed process, will lead to the case where MSR[VSX] bit is
> active in signal frame, but used_vsx bit is not set. (the same applies
> to VR/SPE).
>
> This patch will reinforce this at kernel by always setting used_* bit
> when MSR related bits are active in signal frame and we are doing
> sigreturn.
>
> This patch is based on Ben's Proposal.
>
> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
> Signed-off-by: Simon Guo <wei.guo.simon@gmail.com>

Applied to powerpc next, thanks.

https://git.kernel.org/powerpc/c/e1c0d66fcb179a1737b3d5cc11

cheers

\
 
 \ /
  Last update: 2016-09-17 09:59    [W:0.036 / U:0.184 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site