linux-kernel - Re: [PATCH] powerpc: set used_vsr/used_vr/used_spe in sigreturn path when MSR bits are active

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Date:   Sun, 11 Sep 2016 21:58:57 +0800
From:   Simon Guo <wei.guo.simon@...il.com>
To:     Michael Ellerman <mpe@...erman.id.au>
Cc:     Paul Mackerras <paulus@...ba.org>,
        Anton Blanchard <anton@...ba.org>,
        Cyril Bur <cyrilbur@...il.com>,
        Michael Neuling <mikey@...ling.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Amanieu d'Antras <amanieu@...il.com>,
        linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>
Subject: Re: [PATCH] powerpc: set used_vsr/used_vr/used_spe in sigreturn path
 when MSR bits are active

On Tue, Jul 26, 2016 at 04:06:01PM +0800, wei.guo.simon@...il.com wrote:
> From: Simon Guo <wei.guo.simon@...il.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.
> 
Hi Michael,

Just a ping for this patch. 
The history locates at:
http://linuxppc.10917.n7.nabble.com/PATCH-v4-powerpc-Export-thread-struct-used-vr-used-vsr-to-user-space-td110147.html#a110161

If any addtional work required, please let me know.

Thanks,
- Simon