[RFT - PATCH v2 0/2] KVM/arm64: add fp/simd lazy switch support

Christoffer Dall christoffer.dall at linaro.org
Mon Oct 5 08:45:40 PDT 2015

On Tue, Sep 22, 2015 at 04:34:01PM -0700, Mario Smarduch wrote:
> This is a 2nd itteration for arm64, v1 patches were posted by mistake from an 
> older branch which included several bugs. Hopefully didn't waste too much of 
> anyones time.
> This patch series is a followup to the armv7 fp/simd lazy switch
> implementation, uses similar approach and depends on the series - see
> https://lists.cs.columbia.edu/pipermail/kvmarm/2015-September/016516.html
> It's based on earlier arm64 fp/simd optimization work - see
> https://lists.cs.columbia.edu/pipermail/kvmarm/2015-July/015748.html
> And subsequent fixes by Marc and Christoffer at KVM Forum hackathon to handle
> 32-bit guest on 64 bit host (and may require more here) - see
> https://lists.cs.columbia.edu/pipermail/kvmarm/2015-August/016128.html
> This series has be tested with arm64 on arm64 with several FP applications 
> running on host and guest, with substantial decrease on number of 
> fp/simd context switches. From about 30% down to 2% with one guest running.
> At this time I don't have arm32/arm64 working and hoping Christoffer and/or
> Marc (or anyone) can test 32-bit guest/64-bit host.
Did you already have some test infrastructure/applications that I can
reuse for this purpose or do I have to write userspace software?


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