Re: [Xen-devel] [Xen-4.0.0] domU screen corruption on switching consoles

[Arvind R <arvino55@xxxxxxxxx>]

On Tue, Apr 13, 2010 at 2:07 PM, Arvind R <arvino55@xxxxxxxxx> wrote:
> On Tue, Apr 13, 2010 at 12:10 PM, Arvind R <arvino55@xxxxxxxxx> wrote:
>> On Tue, Apr 13, 2010 at 11:28 AM, Arvind R <arvino55@xxxxxxxxx> wrote:
>>> On Mon, Apr 12, 2010 at 6:09 PM, Pasi Kärkkäinen <pasik@xxxxxx> wrote:
>>>> On Mon, Apr 12, 2010 at 05:09:29PM +0530, Arvind R wrote:
>>>>> Hi,
>>>>> Got a domU running 2.6.32.3 pvops kernel. This is perfectly fine on dom0
>>>>> (2.6.32.10 pvops) witn xen-3.4rc3 hypervisor.
>>>>>
>>>>
>>>> So the domU is PV (paravirtualized?
>>>>
>>>>> But with xen-4.0.0 hypervisor, the domU screen is unreadably corrupt
>>>>> on switching
>>>>> to xm-console (ctrl-alt-2) and back.
>>>>
>>>> Switching between what? Do you have X running on dom0?
>>> Yes. Accelerated nouveau running fine.
>>>
>>> domU has no X - just minimal console based debian-etch with
>>> non-graphical browser and some utilities.
>>>
>>>> It's not clear between what you're switching..
>>>>
>>> Switching between the domU VT-console to qemu console (focus on
>>> domU console, ctrl-alt-2(for xm commands to eject, ...)) and back 
>>> (ctrl-alt-1)
>>> From corrupt screen, ctrl-alt-2 goes back to xm-console fine as many times
>>> as you want. Using sendkey ctrl-alt-F2 switches to corrupt login screen on
>>> VT-2 of domU. On xen-3.4rc3, all of these work fine.
>>>
>>>> Does the domU have pvfb (vfb) graphical framebuffer?
>>>>
>>> Yes. This is what gets corrupted.
>>>
>>>>> Blind commands work - like
>>>>> shutdown. The screen
>>>>> remains static and corrupt. Can swicth to xm-console which is fine.
>>>>> Nothing in logs.
>>>>>
>>>>
>>>> -- Pasi
>>>>
>>>>
>>>
>> Something in the logs (qemu-dm) now, a continuous string of foll. line.
>> xen_be: vfb-0: xenfb_guest_copy: oops: convert 32 -> 32 bpp?
>>
> In hw/xenfb.c, xenfb_guest_copy(), the case of xenfb->depth == bpp
> is not handled. Attached patch corrects the screen corruption.
>
> Now, after switching back, the screen is OK; but further key-strokes
> are NOT echoed to screen. Blind typing produces proper output.
> e.g. blindly typing 'ls' shows directory listing; but the 'ls' is not echoed.
>
The console I refer to is the qemu-console.
Just discovered that HVMs are OK. PV-domU has the problem.

Am I on the right mailing-list for this?

- arvind.

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