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Bug#708344: marked as done (xen: serial passthrough broken in Debian Wheezy)

Your message dated Fri, 23 Apr 2021 15:54:46 +0200
with message-id <YILRphLsO6vCyUIL@eldamar.lan>
and subject line Re: Bug#708344: xen: serial passthrough broken in Debian Wheezy
has caused the Debian Bug report #708344,
regarding xen: serial passthrough broken in Debian Wheezy
to be marked as done.

This means that you claim that the problem has been dealt with.
If this is not the case it is now your responsibility to reopen the
Bug report if necessary, and/or fix the problem forthwith.

(NB: If you are a system administrator and have no idea what this
message is talking about, this may indicate a serious mail system
misconfiguration somewhere. Please contact owner@bugs.debian.org
immediately.)


-- 
708344: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=708344
Debian Bug Tracking System
Contact owner@bugs.debian.org with problems
--- Begin Message --- 
Package: src:linux
Version: 3.2.41-2
Severity: important

Hello,

I just discovered a strange bug with serial passthrough in xen 4.1 on
Debian Wheezy. The Dom0 has a GSM modem connected to serial port. The
serial port is passed through to a DomU with options 'irq = [ 4 ]' and
'ioports = [ '3f8-3ff ]'.

This worked as expected on Debian Squeeze with Xen 4.0 and Linux kernel
2.6.32 (both for Dom0 and DomU). On Debian Wheezy with Xen 4.1 and
Linux kernel 3.2.0 the passthrough seems to work as well (/dev/ttyS0
appears in dmesg of DomU), but something is wrong. The GSM modem
doesn't behave as expected. The smstools daemon errors out with 'Cannot
open serial port /dev/ttyS0, error: Function not implemented'.

It took me hours to find the difference, but it seems like the guest
(domU) kernel is the problem. The setup keeps working when Dom0 is
upgraded to Debian Wheezy with Xen 4.1 and linux kernel 3.2.0. It even
keeps working if the DomU userland is upgraded to Debian Wheezy. Only
if I upgrade the DomU linux kernel to 3.2.0 from Wheezy as well,
smstools stops working.

I don't expect this to be a smstools bug. More likely, something
regarding serial pass through functions of xen is broken in 3.2.0
kernel from Debian Wheezy.

Please give me advice on how to provide additional information.

Kind regards,
  jonas


-- Package-specific info:
** Version:
Linux version 3.2.0-4-amd64 (debian-kernel@lists.debian.org) (gcc version 4.6.3 (Debian 4.6.3-14) ) #1 SMP Debian 3.2.35-2

-- System Information:
Debian Release: 7.0
  APT prefers stable
  APT policy: (500, 'stable')
Architecture: amd64 (x86_64)

Kernel: Linux 3.2.0-4-amd64 (SMP w/1 CPU core)
Locale: LANG=C, LC_CTYPE=C (charmap=ANSI_X3.4-1968)
Shell: /bin/sh linked to /bin/dash

--- End Message ---
--- Begin Message --- 
Hi

Assuming the issue is not anymore reproducible on recent kernels I'm 
going to close this bugreport by now to clean up the list of src:linux
bugs from very old issues. In case you can reproduce the issue feel
free to reopen the bug.
 
Regards,
Salvatore

--- End Message ---
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