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Re: serial hang in qemu-system-ppc64 -M pseries

From: Thomas Huth
Subject: Re: serial hang in qemu-system-ppc64 -M pseries
Date: Wed, 27 Apr 2022 17:36:42 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Thunderbird/91.8.0

On 27/04/2022 17.27, Thomas Huth wrote:
On 26/04/2022 12.26, Rob Landley wrote:
When I cut and paste 80-ish characters of text into the Linux serial console, it reads 16 characters and stops. When I hit space, it reads another 16 characters,
and if I keep at it will eventually catch up without losing data. If I type,
every character shows up immediately.

That "16" certainly comes from VTERM_BUFSIZE in hw/char/spapr_vty.c in the QEMU sources, I think.

(On other qemu targets and kernels I can cut and paste an entire uuencoded
binary and it goes through just fine in one go, but this target hangs with big
pastes until I hit keys.)

Is this a qemu-side bug, or a kernel-side bug?

Kernel config attached (linux 5.18-rc3 or thereabouts), qemu invocation is:

qemu-system-ppc64 -M pseries -vga none -nographic -no-reboot -m 256 -kernel
vmlinux -initrd powerpc64leroot.cpio.gz -append "panic=1 HOST=powerpc64le

Which version of QEMU are you using? Which frontend (GTK or terminal?) ... this rings a distant bell, but I thought we had fixed these issues long ago in the past... e.g.:


... but maybe my memory also just fails and this has never been properly fixed.

In case you're using GTK, I think I just found the problem that I was remembering again:


I assume this has never been properly fixed.


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