Re: CPUs with EVA support

[Thomas Bogendoerfer <tsbogend@alpha.franken.de>]

On Mon, Dec 28, 2020 at 09:28:53AM +0800, Jiaxun Yang wrote:
> 
> 
> On Mon, Dec 28, 2020, at 6:26 AM, Thomas Bogendoerfer wrote:
> > On Mon, Dec 21, 2020 at 08:38:00AM +0800, Jiaxun Yang wrote:
> > > > How good is EVA support in qemu ?
> > > 
> > > EVA is functional in QEMU.
> > > I had tested it with P5600 malta system.
> > 
> > and it's working for you ? I've setup a qemu malta system running
> > debian buster. It boots fine when CPU is != P5600, but as soon as
> > I enable -cpu P5600 it stops booting:
> > 
> > Run /bin/bash as init process
> > request_module: kmod_concurrent_max (0) close to 0 (max_modprobes: 50), 
> > for module binfmt-464c, throttling...
> > request_module: modprobe binfmt-464c cannot be processed, kmod busy 
> > with 50 threads for more than 5 seconds now
> > Kernel panic - not syncing: Requested init /bin/bash failed (error -8).
> 
> Well you need add "ieee754=relaxed" to cmdline
> to workaround this.
> 
> It's due to NAN2008 mismatch.

excellent, now it boots. I had to specify "coherentio" as kernel parameter
to avoid a pcnet32 driver crash the kernel. Looks like creating uncached
pointers is borken in EVA kernels, is this a known issue ?

Thomas.

-- 
Crap can work. Given enough thrust pigs will fly, but it's not necessarily a
good idea.                                                [ RFC1925, 2.3 ]