[Qemu-devel] Problem: Keyboard dead after "-loadvm"

[Qemu-devel] Problem: Keyboard dead after "-loadvm"

[Carsten Thorenz]

Hi there,

I've experienced problems after loading a vm.

It works fine if the vm is loaded via loadvm 
inside the monitor, but if I load the same vm
from the shell with "qemu blah blah -loadvm my_vm",
the keyboard is not working correctly.

Any hints?

Thanks,

Carsten
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Re: [Qemu-devel] Problem: Keyboard dead after "-loadvm"

[Johannes Schindelin]

Hi,

On Mon, 17 Jul 2006, Carsten Thorenz wrote:

> I've experienced problems after loading a vm.
> 
> It works fine if the vm is loaded via loadvm 
> inside the monitor, but if I load the same vm
> from the shell with "qemu blah blah -loadvm my_vm",
> the keyboard is not working correctly.
> 
> Any hints?

Try pressing&releasing Shift, Alt and Ctrl after loading. (Most likely, 
your saved vm has two of them recorded as pressed, since you switched to 
the monitor with that combination plus a number.)

Hth,
Dscho

P.S.: There were a couple of (almost identical) patches to help that, but 
they were probably never applied.

Re: Re: [Qemu-devel] Problem: Keyboard dead after "-loadvm"

[Carsten Thorenz]

Von: Johannes Schindelin <Johannes.Schindelin@gmx.de>
> Try pressing&releasing Shift, Alt and Ctrl after loading. 

O.k., that solves it. But ...

> P.S.: There were a couple of (almost identical) patches to help that, but 
> they were probably never applied.

... somebody should take care for the patches :)

Thanks,

Carsten

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Re: [Qemu-devel] Problem: Keyboard dead after "-loadvm"

[Fabrice Bellard]

Carsten Thorenz wrote:
> Von: Johannes Schindelin <Johannes.Schindelin@gmx.de>
> 
>>Try pressing&releasing Shift, Alt and Ctrl after loading. 
> 
> 
> O.k., that solves it. But ...
> 
> 
>>P.S.: There were a couple of (almost identical) patches to help that, but 
>>they were probably never applied.
> 
> 
> ... somebody should take care for the patches :)

Sometimes I try :-) But evaluating patches takes a large amount of time 
and in a program like QEMU regressions are difficult to track and very 
easy to introduce...

Fabrice.

Re: [Qemu-devel] Problem: Keyboard dead after "-loadvm"

[Christian MICHON]

On 7/17/06, Fabrice Bellard <fabrice@bellard.org> wrote:
> Sometimes I try :-) But evaluating patches takes a large amount of time
> and in a program like QEMU regressions are difficult to track and very
> easy to introduce...
>

not all on this list do contribute patches (in my case, not much
contribution at this level). But I believe we're tons of testers of
incoming patches :)

you're not alone to test these patches: this is what I mean...

I remember the asynchronous/dma patch could be also a good
candidate for insertion, if it could be updated...

-- 
Christian

[Qemu-devel] Re: Problem: Keyboard dead after "-loadvm"

[Anthony Liguori]

On Mon, 17 Jul 2006 23:28:40 +0200, Christian MICHON wrote:

> On 7/17/06, Fabrice Bellard <fabrice@bellard.org> wrote:
>> Sometimes I try :-) But evaluating patches takes a large amount of time
>> and in a program like QEMU regressions are difficult to track and very
>> easy to introduce...
>>
>>
> not all on this list do contribute patches (in my case, not much
> contribution at this level). But I believe we're tons of testers of
> incoming patches :)
> 
> you're not alone to test these patches: this is what I mean...
> 
> I remember the asynchronous/dma patch could be also a good candidate for
> insertion, if it could be updated...

I actually think the last dma patch I saw was addressing the problem in
the wrong way.

IIRC, it was using threads?  We really ought to do the work to make the
block API properly asynchronous.  It may seem tedious now, but it would
also allow the use of something like linux-aio down the road which has the
potential to have a pretty huge performance impact on block performance
(with pbrook's recent SCSI emulation).

Regards,

Anthony Liguori

Re: [Qemu-devel] Re: Problem: Keyboard dead after "-loadvm"

[Paul Brook]

> IIRC, it was using threads?  We really ought to do the work to make the
> block API properly asynchronous.  It may seem tedious now, but it would
> also allow the use of something like linux-aio down the road which has the
> potential to have a pretty huge performance impact on block performance
> (with pbrook's recent SCSI emulation).

I'd expect most of the benefits would also apply to IDE (with DMA enabled, 
obviously).

I'd also expect that a well designed interface would be able to work with 
either threads or aio.

Paul