linux-kernel - Re: [v4] powerpc: Export thread_struct.used_vr/used

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Message-ID: <20160715071546.GA5290@simonLocalRHEL7.x64>
Date:	Fri, 15 Jul 2016 15:15:46 +0800
From:	Simon Guo <wei.guo.simon@...il.com>
To:	Michael Ellerman <mpe@...erman.id.au>
Cc:	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Laurent Dufour <ldufour@...ux.vnet.ibm.com>,
	linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
	Paul Mackerras <paulus@...ba.org>,
	Kees Cook <keescook@...omium.org>,
	Rashmica Gupta <rashmicy@...il.com>,
	"cyrilbur@...il.com" <cyrilbur@...il.com>
Subject: Re: [v4] powerpc: Export thread_struct.used_vr/used_vsr to user space

Michael, Ben,
On Fri, Jul 08, 2016 at 08:02:42PM +1000, Michael Ellerman wrote:
> Benjamin Herrenschmidt <benh@...nel.crashing.org> writes:
> 
> > On Thu, 2016-07-07 at 23:21 +1000, Benjamin Herrenschmidt wrote:
> >> 
> >> I think the right fix is that if a restore_sigcontext() has the MSR
> >> bits set,
> >> it should set the corresponding used_* flag.
> >
> > Something like this:
> >
> > (totally untested)
> 
> Simon/Laurent, can you guys test this and let me know if it works for
> your usecase.
> 

Sorry for the late reply. I tested Ben's patch and the fix works for the CRIU
case mentioned before.

Thanks,
Simon