Re: [Xen-devel] [PATCH RFC] x86/xsave: prefer eager clearing of state over eager restoring

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 21.08.18 at 12:10, <wei.liu2@xxxxxxxxxx> wrote:
> On Thu, Aug 16, 2018 at 10:07:00AM +0100, Andrew Cooper wrote:
>> Irrespective of what we do here, I'd really like Wei to rebase his work
>> to remove the lazy fpu logic from the nested virt paths, because its a
>> no-brainer (perf wise) and comes with a massive amount of code
>> simplification in Xen.
> 
> I am very happy to get rid of more code if that's agreed. :-)

Well, we'll have to see. I don't recall a series removing
"lazy fpu logic from the nested virt paths"; I only recall a (giant)
patch removing it altogether from Xen (which would need to be
backed by numbers imo, first and foremost because going
forward the price of eager state loading is only going to grow,
since they'll only ever add new states, while the performance
of lazy state loading is - especially for the load avoided case -
likely to remain relatively stable).

Jan



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