Messages in this thread | | | Date | Sun, 11 Sep 2016 21:58:57 +0800 | From | Simon Guo <> | Subject | Re: [PATCH] powerpc: set used_vsr/used_vr/used_spe in sigreturn path when MSR bits are active |
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On Tue, Jul 26, 2016 at 04:06:01PM +0800, wei.guo.simon@gmail.com 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. > 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
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