On 2016-01-05 04:04, Pat Riehecky wrote:
> On 01/04/2016 10:58 AM, Pat Riehecky wrote:
>> On 01/04/2016 10:30 AM, Steven Haigh wrote:
>>> On 05/01/16 03:27, Pat Riehecky wrote:
>>>> On 01/02/2016 12:49 AM, Steven Haigh wrote:
>>>>> Hi guys,
>>>>>
>>>>> Just wondering if it is possible to create an updates.img that
>>>>> includes
>>>>> the following kernel modules for the PXE boot install images:
>>>>>
>>>>> CONFIG_XEN_FBDEV_FRONTEND=m
>>>>> CONFIG_HVC_XEN=m
>>>>> CONFIG_HVC_XEN_FRONTEND=m
>>>>>
>>>>> The SL7 kernels used on the anaconda installer don't have these
>>>>> options
>>>>> set - so there is no VNC graphical output to the Xen system. This
>>>>> means
>>>>> that unless you use the 'console' (xl console command), then you
>>>>> can't
>>>>> see what's going on with the DomU install.
>>>>>
>>>>> It seems SL6 behaves properly for this - and it may well be seen to
>>>>> stray from the path too much to include in the base PXE image
>>>>> kernel -
>>>>> which means having an updates.img would be a nice compromise - ie
>>>>> its
>>>>> optional and doesn't require modification of the core install
>>>>> images.
>>>>>
>>>>> There is an updates.img currently in the PXE directory of 7rolling,
>>>>> but
>>>>> that seems to cause a whole heap of problems if its used...
>>>>>
>>>> Hi Steven,
>>>>
>>>> I've not got a lot of experience working with Xen, but I'll look
>>>> into
>>>> what this would take.
>>> Thanks Pat,
>>>
>>> I know absolutely nothing about anaconda and the build process for
>>> images. I'd be more than happy to test whatever I can though.
>>>
>>> I run Xen just about everywhere - and also run http://xen.crc.id.au -
>>> so
>>> if you have any Xen questions, I'd be more than happy to help out.
>>>
>> I'm showing:
>>
>> $ grep CONFIG_HVC_XEN .config
>> CONFIG_HVC_XEN=y
>> CONFIG_HVC_XEN_FRONTEND=y
>>
>> for the 3.10.0-327 series kernels.
>
> Searching around upstream bugzilla, I'm not seeing any requests to get
> CONFIG_XEN_FBDEV_FRONTEND=m (or =y for that matter).
>
> Steven, can I have you file a bug upstream and put me on the CC list
> so we can get some forward motion on a long term solution?
Hi Pat,
I don't believe there is anything open in the RH BZ. The kernel config
has been the same through the EL7 betas up until current day - so I
believe putting a BZ report in would get a CLOSED WONTFIX.
I'll quote a little bit of Konrad from CentOS fame from the EL7 betas:
----- START QUOTE -----
You can boot an RHEL7 guest as PV, but there are issues:
1). The FB driver has been unset (CONFIG_XEN_FBDEV_FRONTEND) that
means you can
still do a text-console (in theory).
2). The Xorg fb seems to suffer from some bug - which is why the Xen
FB has
be turned off.
3). There are also some systemd and udev things missing.
I understand that folks are interested in getting this fixed, but I was
wondering what the protocol is for getting said patches in the
respective
RPMS (xorg-some-server, udev, systemd, kernel)?
Naturally this needs to be fixed upstream first, but once that has been
completed it should be fairly easy to backport it.
----- END QUOTE -----
From my experimentation, most of the above seems to be fixed. The one
problem is that because CONFIG_XEN_FBDEV_FRONTEND is not set for the
installer kernel, no FBDEV is initialised on installation - meaning that
if you use vncviewer to do the installation, you only get a message
saying "GUEST HAS NOT YET INITIALISED GRAPHICS".
The text console is ONLY available by ssh'ing into the Xen Host and
using the 'xl console <guest name>' command. The vncviewer obviously has
the advantage that because its available over a network, no access to
the host is required to run the installer.
I build a custom kernel for EL6 & EL7 that fixes this:
http://xen.crc.id.au/git/?p=kernel-xen;a=summary
It works perfectly for a both the Xen Guest (DomU) and Xen Host (Dom0) -
however trying to get this working on the installer is a bit of a task
beyond me.
The thoughts behind specifically putting at least
CONFIG_XEN_FBDEV_FRONTEND as a module - then in an update image to be
provided to the installer via a kickstart wouldn't change any of the
current installer / code paths or vary from upstream.
--
Steven Haigh
Email: [log in to unmask]
Web: https://www.crc.id.au
Phone: (03) 9001 6090 - 0412 935 897
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