Dear Maintainer,
I found that I could also reproduce this issue on my AMD Ryzen 7.
Based on the modification date of my VM it was working
with Buster/testing at least at 2018-08-24 at this hardware.
I tested the binaries qemu-system-x86_64 down to 2.12+dfsg-2 and
also current qemu git, all show the VM fail the same way.
So I guessed it might be a kernel or firmware issue (firmware
got updated in between).
Then I found following:
https://lkml.org/lkml/2019/5/4/113
So maybe 4.19.28+2 (4.19.0-4) does not yet contain the first [1] change,
or a kernel >= 4.19.40 may contain the fix [2] already.
In the regular tree this first change appeared
with v5.1-rc3, and the fix in v5.1.
Kind regards,
Bernhard
[1]
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?h=linux-4.19.y&id=b9733a74350d6ab2e1a36bface0e3b36866945de
-> Maybe the introducing change, first in Linux 4.19.33 (2019-04-03)
[2]
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?h=linux-4.19.y&id=499bbe739d5aeb1bb775fed5523902f840cbe67b
-> Maybe fix contained in Linux 4.19.40 (2019-05-05)
