[Sound-open-firmware] DSP VM to x86 VM communication in QEMU

[Ranjani Sridharan]

On Tue, 2019-04-16 at 11:48 -0700, Dylan Reid wrote:
> On Tue, Apr 16, 2019 at 8:25 AM Kai Vehmanen
> <kai.vehmanen at linux.intel.com> wrote:
> > 
> > Hi,
> > 
> > On Mon, 15 Apr 2019, Liam Girdwood wrote:
> > 
> > > 
https://www.alsa-project.org/main/index.php/Firmware#Using_the_Qemu_DSP_emulator
> > > 
> > > These instructions are out of date, so you may find that other
> > > qemu dependencies
> > > are needed to build. Host (x86) side is not yet supported for SKL
> > > on wards atm
> > > (needs code to hook into qemu HDA core), but xtensa DSP is
> > > supported on all
> > > platforms.
> > 
> > I can verify the DSP side is functional and I could set up an
> > environment
> > following the wiki and run latest and greatest FW from SOF
> > mainline.
> > 
> > There is some regression with host side though, even when trying to
> > use
> > older targets than SKL. I reverted the SOF qemu branch to v1.2
> > level and
> > ta-daa, I got both sides working (with latest driver and fw, BYT
> > target).
> > 
> > I'll next bisect the commits since v1.2 to see where it broke down.
> 
> Thanks Kai,
> 
> For context, the Chrome OS team is evaluating reusing the interface
> from the DSP side to improve audio latency and capability for our
> guest VMs.
Hi Dylan,

We're working on getting the topology loaded on the QEMU DSP at the
moment. Not sure if it is needed for your purpose but if you want to
measure audio latency, I suppose it might be. I will post the patches
as soon as the work is complete.

Thanks,
Ranjani
> 
> Cheers,
> 
> Dylan
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