Re: [Xen-users] Need clarifications: Xen and winXP HVM: pci direct access, USB, desktop resolution

[kadafax <kadafax@xxxxxxxxx>]

Petersson, Mats wrote:
> > -----Original Message-----
> > From: xen-users-bounces@xxxxxxxxxxxxxxxxxxx 
> > [mailto:xen-users-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of kadafax
> > Sent: 24 November 2006 15:34
> > To: xen-users@xxxxxxxxxxxxxxxxxxx
> > Subject: [Xen-users] Need clarifications: Xen and winXP HVM: 
> > pci direct access, USB, desktop resolution
> > Hi list,
> > I'm totally new at xen and apologize for my ignorance. What 
> > I'm trying 
> > to do is the following:
> > I've got a laptop with core 2 duo cpu.
> > Dom0: Fedora Core 6.
> > Dom1: WinXP HVM
> >
> > I want to give the Dom1 full access to the wifi card, and the 
> > possibility to use USB pen drive. So I've hidden the pci address 
> > (according to lspci output) in the kernel's line:
> > kernel /xen.gz-2.6.18-1.2849.fc6 pciback.permissive 
> > pciback.hide=(0c:00.0)
> > and added the following in the dom1's config file:
> > pci=['0c,00,0']
> >
> >
> > The result when I 'xm create windows':
> >
> > Error: pci: failed to locate device and parse it's resources 
> > - [Errno 2] No such file or directory: 
> > '/sys/bus/pci/devices/0000:0c:00.0/driver'
> >     
> PCI can't be accesed from HVM domains, because the HVM domain isn't
> aware that it's being virtualized. To make this work without modifying
> the driver to understand virtualization, the hardware (and Xen) will
> have to support IOMMU, which isn't available today. 
>
> I don't know why you get that particular error message, but it's not
> really important WHAT error message you get, as it's not going to work
> anywyas. 
>   
> > I've tried the same with a USB controller to the HVM with the same 
> > result. But it wasn't a missing files problem:
> > Error: pci: PCI Backend does not own device 0000:00:1d.0
> > See the pciback.hide kernel command-line parameter or
> > bind your slot/device to the PCI backend using sysfs
> >     
> I don't know what the difference is, but it's still not going to work. 
>
> You may be able to attach the device to your guest as a "hard-disk", but
> my guess is that you're not really wanting to do that. 
>   
> > So it's here that I need some clarifications, because I've seen some 
> > posts wheres people were talking about successfully attaching a usb 
> > printer and some telling that it was impossible in a HVM to 
> > give direct 
> > access to hardware (fully virtualized so there is a need to 
> > develop none 
> > open source drivers etc...).
> >
> > My second problem is surely independent from the above. It is that I 
> > want a bigger desktop resolution in winXP and that the cirrus 
> > emulated 
> > card only show to the os 4mb of VRAM. I've tried the stdvga=1 in the 
> > config file but then the HVM wont boot (blank screen after bios 
> > informations).
> >     
> It's probably possible to increase the VRAM measure. Using stdvga will
> not solve anything, as that will not allow a higher resolution (more
> likely LESS resolution). Although it SHOULD work - I don't know why it's
> not working... Most likely because most people use the CIRRUS logic
> version of the device-model, and it's just got broken... :-(
>
>   
> > I must be totally wrong somewhere...
> >     
> I don't think so, you're just trying to do things that aren't supported
> by Xen at the moment. 
>
> --
> Mats
>   
> > Thanks for any input.
> > Regards,
> > kfx
> >
> > _______________________________________________
> > Xen-users mailing list
> > Xen-users@xxxxxxxxxxxxxxxxxxx
> > http://lists.xensource.com/xen-users
> >
> >
> >
> >     
>
>   
Thanks Mats, so I have to wait new versions before considering Xen as an 
open-source alternative to VMware's like tools. But will it still be 
Open Source ?
Regards,
kfx

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