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

From: Richard Henderson
Subject: Re: [PATCH for-6.2 0/2] target/sparc: Drop use of gen_io_end()
Date: Sat, 24 Jul 2021 10:47:59 -1000
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.11.0

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
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.


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