[vfio-users] VFIO-PCI with AARCH64 QEMU

Laszlo Ersek lersek at redhat.com
Fri Oct 28 10:13:29 UTC 2016

On 10/27/16 23:32, Haynal, Steve wrote:
> Hi Laszlo,
> Thanks for the detailed response. I'm learning quite a bit. Patching
> the kernel with an unaccepted patch is a little more bleeding edge
> than I can be for this project. I did hack the driver to not depend
> on /sys/bus/pci resource0 for mmap. I am now able to encode yuv video
> to compressed VP9 on the FPGA from an emulated aarch64 guest! The
> performance hit for the emulated aarch64 wasn't as bad as I thought
> it would be. Depending on how I measure time, (portions of the test
> are the same as they run on the same FPGA in emulated aarch64 or kvm
> x86), the penalty is between 1.6X to 2.3X for the emulated aarch64 vs
> kvm x86.

Great, thank you for reporting back about this!

(And yes, QEMU's TCG is awesome. :))


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