Re: [Xen-users] PCI passthrough to Windows XP

[Daniel Shub <Daniel.Shub@xxxxxxxxxxxxxxxx>]

> -----Original Message-----
> From: Ian Campbell [mailto:Ian.Campbell@xxxxxxxxxx]
> Sent: Friday, November 09, 2012 9:10 AM
> To: Daniel E. Shub
> Cc: xen-users@xxxxxxxxxxxxx
> Subject: Re: [Xen-users] PCI passthrough to Windows XP
> 
> > when I boot from the standard kernel I can see my processor supports
> > vmx, although when I boot the Xen kernel, vmx doesn't show up.
> 
> I think this is normal -- since Xen uses the vmx/svm capability it is
> not available to dom0 and therefore is masked.

Thank you for that clarification

> > I also see that another entry has changed its address from
> 
> Changed compared to what?
> 

I put that on the next lines ...

> > 06:00.0 IDE interface: Marvell Technology Group Ltd. 88SE6121 SATA II
> > Controller (rev b2)
> > to
> > 07:00.0 IDE interface: Marvell Technology Group Ltd. 88SE6121 SATA II
> > Controller (rev b2)

> Which dom0 kernel version are you running? Are you certain the the
> pciback module is enabled and builtin (not a module)? This syntax
> (exactly which depends on the kernel version) only works for when
> pciback is statically compiled. If it is modular then you need the
> bind/unbind dance which you described below.

I believe I am running 2.6.32 and Xen 4.0. It is the standard kernel provided 
when you install Xen from Debian Squeeze. I am not sure if the pciback is 
statically compiled. How do I find this out?

> > Looking at the Xen wiki guide
> > http://wiki.xen.org/wiki/Xen_PCI_Passthrough I have tried things like
> >
> > echo 0000:05:00.0 > /sys/bus/pci/devices/0000:05:00.0/driver/unbind
> > echo 0000:05:00.0 > /sys/bus/pci/drivers/pciback/new_slot
> > echo 0000:05:00.0 > /sys/bus/pci/drivers/pciback/bind
> >
> 
> For the purposes of trouble shooting it would be useful to include the
> actual literal commands you ran rather than something "like" them.
> Did you repeat the above bind/unbind commands for 06:04.0?

I wasn't sure I was on the right path with the above so I tried a bunch of 
different things at different times (always preceded by a full power down and 
reboot). I tried it with just 05:00.0, just 06:04.0, and both. I tried it with 
pciback and pcistub.

> 
> > Any ideas how to get pci passthrough working?
> 
> You don't say which version of Xen you are running but if it is 4.2
> then you may have more luck using the xl toolstack, and in particular
> the "xl pci-assignable-add" commands.

Debian Squeeze only has 4.0 installed which is what the wiki beginner walk 
through is based on. I also tried upgrading to Debian Sid/unstable which has 
3.x kernel and Xen 4.1. I looked at Arch Linux which tends to have bleeding 
edge software and a great wiki and they are only in the process of getting 4.2 
working. Is there a distro that supports 4.2 and has a walk through?

> 
> It maybe  that the presence of the bridge device is confusing things.
> What is your pci topology like (lspci -t I think). TBH I'm not sure how
> pci passthrough interacts with PCI bridges but my intuition is that in
> general you do not want to pass thr bridge through, unless perhaps you
> are passing *every* device which is behind it to the same guest.
> 

#lspci -t
-[0000:00]-+-00.0
           +-01.0-[01]--
           +-03.0-[02]--+-00.0
           |            \-00.1
           +-07.0-[03]--
           +-10.0
           +-10.1
           +-14.0
           +-14.1
           +-14.2
           +-14.3
           +-19.0
           +-1a.0
           +-1a.1
           +-1a.2
           +-1a.7
           +-1c.0-[04]--
           +-1c.1-[05-06]----00.0-[06]----04.0
           +-1c.4-[07]----00.0
           +-1d.0
           +-1d.1
           +-1d.2
           +-1d.7
           +-1e.0-[08]--
           +-1f.0
           +-1f.2
           \-1f.3

Which means nothing to me ...

Thanks for the help.

Dan
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