>>> On 2010/05/11 at 03:47, <destinyqq@xxxxxxxxxxx> wrote:
> Hi Nick Couchman
>
> Did you mean like this: we will not see any VGA output and can not
> login to desktop,if add "xen-pciback.hide=(00:02.0)" to grub ?
Not exactly, but kind of. Initially, with that option, things will display
just fine; however, once you start your domU and it claims the video card, you
will lose your ability to use the video card in dom0. There may be a way to
reclaim the video card after your HVM domU is shut down, but I don't know what
that is. The bottom line is that only one domain can use a PCI device at a
time - so, when the domU grabs the VGA device, dom0 cannot use it any longer.
Also, if there is a kernel module loaded that uses any of the PCI cards you
wish to forward through to the domU, you have to unload the module, first,
before the card can be passed through.
>
> I can't passthrough Q45-IGD to hvm.
>
> I add "xen-pciback.hide=(00:02.0)" to grub, but i can login to desktop,
> and i can see 00:02.0 in "xm pci-list-assignable-devices".
>
> Then,I create hvm, the monitor input disappear. But i can reboot Dom0
> from Keyboard.
Yes, you should see the display disappear for your dom0, but you should see the
HVM domU display appear. If the card is dual-headed, you may need to try
switching over to the other video port. Also, make sure you forward through
all of the PCI devices associated with the card - on my Optiplex 755, I forward
00:02.0 and 00:02.1 through. And, make sure you have gfx_passthru enabled.
The keyboard issue is one that I haven't found a great way around. What I
ended up doing is making my dom0 "headless" and using either SSH or a serial
console to access dom0. I then assign the graphics card and all of the USB PCI
devices, as well as the sound card, to the HVM domU so that I can use those
devices there. For what I'm trying to do - run Xen transparently under
Windows, so that my engineers can use a familiar interface, but I can use their
machines for other stuff - this works perfectly fine. Other folks have
suggested purchasing an additional PCI or PCIe USB or PS/2 card that will allow
you to hook up a second keyboard/mouse/etc. to the machine.
-Nick
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