Re: [PATCH 0/2] target/sparc: Enable MTTCG

[Mark Cave-Ayland]

On 30/06/2023 19:05, Richard Henderson wrote:

> On 6/22/23 16:36, Mark Cave-Ayland wrote:
> > On 20/06/2023 17:40, Richard Henderson wrote:
> >
> > > With the addition of TCG_GUEST_DEFAULT_MO, there's nothing in
> > > the cpu emulation preventing this from working.  There is some
> > > board model work to be done for sparc64, where max_cpus = 1.
> >
> > I've tried testing this with the Advent Calendar image at 
> > https://qemu-advent-calendar.org/2018/download/day11.tar.xz and even without these 
> > patches applied I'm seeing hangs with -smp 2. When applied on top of the other 
> > "target/sparc: Use tcg_gen_lookup_and_goto_ptr" series I get assert() after a 
> > minute or two:
>
> Would you try again, now that we've solved the issues with lookup_and_goto_ptr?

The wording above is a bit clumsy on my part, but I was still seeing the hangs on git 
master with -smp 2, but with the older tcg_gen_lookup_and_goto_ptr series not only 
would I see the hangs but I would hit the assert() within a couple of minutes.

My notes on the wiki at https://wiki.qemu.org/Documentation/Platforms/SPARC#Timeline 
suggest that it was working on QEMU 6.2, so I'll need to find a moment to bisect it 
down to see where things broke.


ATB,

Mark.