Re: [PATCH for-6.2 0/2] target/sparc: Drop use of gen_io_end()

[Richard Henderson]

On 7/24/21 10:27 AM, Peter Maydell wrote:
> On Sat, 24 Jul 2021 at 14:49, Peter Maydell <peter.maydell@linaro.org> wrote:
> > There is a slight difficulty here with testing this: icount
> > doesn't seem to work for sparc Linux guests in master at the
> > moment. For instance if you get the advent calendar image from
> >    https://www.qemu-advent-calendar.org/2018/download/day11.tar.xz
> > it will boot without icount with a command line like
> >    qemu-system-sparc -display none -vga none -machine SS-20 -serial stdio 
> > -kernel /tmp/day11/zImage.elf
> > But if you add '-icount auto' it will get as far as
> > "bootconsole [earlyprom0] disabled" and then apparently hang.
> > I'm not sure what's going on here :-(
> > (I filed this as https://gitlab.com/qemu-project/qemu/-/issues/499)
>
> This turns out to be a recent regression, caused by commit 78ff82bb
> ("accel/tcg: Reduce CF_COUNT_MASK to match TCG_MAX_INSNS"). It's
> an intermittent rather than a 100% reproducible hang.

Ouch.  Ok, I'll have a look.

r~