Re: IO port write width clamping differs between TCG and KVM

[Laszlo Ersek <lersek@redhat.com>]

On 1/3/23 18:42, Laszlo Ersek wrote:
> (resending with qemu-devel on CC; sorry!)
> 
> Hi,
> 
> this is with QEMU-7.2.

This is a regression. It works fine with QEMU-5.0. The regression has
not been fixed since QEMU-7.2, as of master @ 222059a0fccf ("Merge tag
'pull-ppc-20221221' of https://gitlab.com/danielhb/qemu into staging",
2022-12-21).

I'm bisecting.

(It's a relief that this is a regression. I felt pretty certain that I
had tested CPU hotplug with TCG as well!

I've picked QEMU-5.0 as the start candidate for my bisection for the
following reason: per git-blame, Igor described the modern interface
detection steps in commit ae340aa3d2567 (which I reviewed), and the
first tag/release to contain that commit was QEMU-5.0. The first QEMU
release after Igor and I had worked on this in QEMU and OVMF definitely
worked with TCG too, by my account.)

Laszlo