[Qemu-devel] vmware vga + kvm interaction

[Qemu-devel] vmware vga + kvm interaction

[Dave Airlie]

If I boot an F12 LiveCD with vmware VGA without KVM enabled, I get the
syslinux boot screen and can pick
options, the same qemu run with -enable-kvm, I just get a blank screen.

Anyone have any clues on why this might be?

all with latest git tree.
Dave.

Re: [Qemu-devel] vmware vga + kvm interaction

[Avi Kivity]

On 12/13/2009 10:55 AM, Dave Airlie wrote:
> If I boot an F12 LiveCD with vmware VGA without KVM enabled, I get the
> syslinux boot screen and can pick
> options, the same qemu run with -enable-kvm, I just get a blank screen.
>
> Anyone have any clues on why this might be?
>
>    

One of the niceties of vmvga is that it accesses cpu registers in 
response to an I/O instruction.  Maybe this bit is broken.  Does your 
hw/vmport.c have cpu_synchronize_state() in vmport_ioport_read()?

Hmm, upstream doesn't, so no surprise it is broken.

-- 
error compiling committee.c: too many arguments to function

Re: [Qemu-devel] vmware vga + kvm interaction

[Anthony Liguori]

Avi Kivity wrote:
> On 12/13/2009 10:55 AM, Dave Airlie wrote:
>> If I boot an F12 LiveCD with vmware VGA without KVM enabled, I get the
>> syslinux boot screen and can pick
>> options, the same qemu run with -enable-kvm, I just get a blank screen.
>>
>> Anyone have any clues on why this might be?
>>
>>    
>
> One of the niceties of vmvga is that it accesses cpu registers in 
> response to an I/O instruction.  Maybe this bit is broken.  Does your 
> hw/vmport.c have cpu_synchronize_state() in vmport_ioport_read()?
>
> Hmm, upstream doesn't, so no surprise it is broken.
vmware-vga does not use vmport.

The issue is about related to dirty tracking and how the vbe bios memory 
gets mapped.  I've posted patches on the list before.

Regards,

Anthony Liguori

Re: [Qemu-devel] vmware vga + kvm interaction

[Dave Airlie]

On Mon, Dec 14, 2009 at 3:59 AM, Anthony Liguori <anthony@codemonkey.ws> wrote:
> Avi Kivity wrote:
>>
>> On 12/13/2009 10:55 AM, Dave Airlie wrote:
>>>
>>> If I boot an F12 LiveCD with vmware VGA without KVM enabled, I get the
>>> syslinux boot screen and can pick
>>> options, the same qemu run with -enable-kvm, I just get a blank screen.
>>>
>>> Anyone have any clues on why this might be?
>>>
>>>
>>
>> One of the niceties of vmvga is that it accesses cpu registers in response
>> to an I/O instruction.  Maybe this bit is broken.  Does your hw/vmport.c
>> have cpu_synchronize_state() in vmport_ioport_read()?
>>
>> Hmm, upstream doesn't, so no surprise it is broken.
>
> vmware-vga does not use vmport.
>
> The issue is about related to dirty tracking and how the vbe bios memory
> gets mapped.  I've posted patches on the list before.
>

I actually reinvented at least one of the patches locally and it
didn't seem to help,
but I'll try and take a closer look today,

Dave.

Re: [Qemu-devel] vmware vga + kvm interaction

[Anthony Liguori]

Dave Airlie wrote:
> I actually reinvented at least one of the patches locally and it
> didn't seem to help,
> but I'll try and take a closer look today,
>   

http://repo.or.cz/w/qemu/aliguori-queue.git vmware-vga-for-dave

Is the local branch I have for vmware-vga work.  I'm not sure why I 
never pushed those patches, but I suspect it's because I was still 
tracking down a bug.  IIRC, this branch fixes things with -enable-kvm, 
but I'd usually see a SEGV in qemu about 1-2 minutes after getting into 
X.  I don't think that has anything to do with kvm though.

Regards,

Anthony Liguori
> Dave.
>   

Re: [Qemu-devel] vmware vga + kvm interaction

[Dave Airlie]

On Tue, Dec 15, 2009 at 12:28 AM, Anthony Liguori <anthony@codemonkey.ws> wrote:
> Dave Airlie wrote:
>>
>> I actually reinvented at least one of the patches locally and it
>> didn't seem to help,
>> but I'll try and take a closer look today,
>>
>
> http://repo.or.cz/w/qemu/aliguori-queue.git vmware-vga-for-dave
>
> Is the local branch I have for vmware-vga work.  I'm not sure why I never
> pushed those patches, but I suspect it's because I was still tracking down a
> bug.  IIRC, this branch fixes things with -enable-kvm, but I'd usually see a
> SEGV in qemu about 1-2 minutes after getting into X.  I don't think that has
> anything to do with kvm though.
>

Just to say me too, thats happening here alright, I just haven't had spare time
to debug it yet.

Dave.