Re: [PATCH RFC 0/5] Eliminate double-copying of FP/VMX/VSX state

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On 09.09.2013, at 09:28, Michael Neuling wrote:

>> At present, PR KVM and BookE KVM does multiple copies of FP and
>> related state because of the way that they use the arrays in the
>> thread_struct as an intermediate staging post for the state.  They do
>> this so that they can use the existing system functions for loading
>> and saving state, and so that they can keep guest state in the CPU
>> registers while executing general kernel code.
>> 
>> This patch series reorganizes things so that KVM and the main kernel
>> use the same representation for FP/VMX/VSX state, and so that guest
>> state can be loaded/save directly from/to the vcpu struct instead of
>> having to go via the thread_struct.  This simplifies things and should
>> be a little faster.
>> 
>> This series is against Alex Graf's kvm-ppc-queue branch plus my recent
>> series of 23 patches to make PR and HV KVM coexist.
> 
> This is great!
> 
> Alex, can you pull this into your tree?  

I never apply RFC patches if I can avoid it. Paul, if you think they're ready for inclusion, please repost them as actual patches.


Alex

> It's going to be very useful
> for POWER8 transactional memory as we have to save another set of VSX
> state.  The changes in 4/5 are going to make coding this up a lot
> cleaner
> 
> There are a lot of generic powerpc changes in here also.  Perhaps, if
> Alex is fine with these, he can ACK them and benh can pull this in?
> 
> Mikey
> 
>> 
>> Paul.
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