Re: [Xen-users] VGA Passthru

[<destinyqq@xxxxxxxxxxx>]

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 ?
   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.
   This is my log:

domid: 1
Watching /local/domain/0/device-model/1/logdirty/cmd
Watching /local/domain/0/device-model/1/command
char device redirected to /dev/pts/1
qemu_map_cache_init nr_buckets = 4000 size 327680
shared page at pfn feffd
buffered io page at pfn feffb
Guest uuid = 16796547-bbc7-c0ad-5253-565df7f2e08a
Time offset set 0
xs_read(/local/domain/0/device-model/1/xen_extended_power_mgmt): read error
Log-dirty: no command yet.
I/O request not ready: 0, ptr: 0, port: 0, data: 0, count: 0, size: 0
dm-command: hot insert pass-through pci dev
register_real_device: Assigning real physical device 00:02.0 ...
register_real_device: Enable MSI translation via per device option
register_real_device: Disable power management
pt_iomul_init: Error: pt_iomul_init can't open file /dev/xen/pci_iomul: No 
such file or directory: 0x0:0x2.0x0
pt_register_regions: IO region registered (size=0x00400000 
base_addr=0xd3400004)
pt_register_regions: IO region registered (size=0x10000000 
base_addr=0xb000000c)
pt_register_regions: IO region registered (size=0x00000008 
base_addr=0x0000f221)
setup_vga_pt: vga bios checksum is adjusted!
pt_msgctrl_reg_init: MSI enabled already, disable first
register_real_device: Error: Mapping irq failed, rc = -1
pt_msi_setup: msi mapped with pirq 37
pci_intx: intx=1
register_real_device: Real physical device 00:02.0 registered successfuly!
IRQ type = MSI-INTx



--------------------------------------------------
From: "Nick Couchman" <Nick.Couchman@xxxxxxxxx>
Sent: Monday, May 10, 2010 11:00 PM
To: "çää" <ben3468.wang@xxxxxxxxx>; <xen-users@xxxxxxxxxxxxxxxxxxx>
Subject: Re: [Xen-users] VGA Passthru

> This may seem like an obvious point, but when you enable VGA or PCI
> passthrough, you are not *sharing* these devices between dom0 and domU,
> the devices are taken away from dom0 and assigned *exclusively* to domU.
> This means that, once you assign your VGA card to your domU, you will
> no longer be able to use the console to log in to dom0.  Also, if your
> machine has a single network interface card, and you assign that to your
> domU, your dom0 will no longer be able to use the network card and you
> will lose access to it.  PCI devices may only be assigned to one dom, so
> you need to choose your configuration correctly.
>
> I pass my VGA and USB controllers through to my domU, and use the
> serial port for direct physical access to my dom0.  The network card
> remains in dom0, and I used network bridging to run network connections
> from my domU and maintain network connectivity for dom0.
>
> -Nick
>
> > > > On 2010/05/08 at 05:32, çää<ben3468.wang@xxxxxxxxx> wrote:
> > Hello
> >   I am new in XEN and Linux. I am trying the VGA passthru. I can
> > xen-pciback.hide EtherNet, Serial Com port. But when I
> xen-pciback.hide my
> > VGA. I can no longer login to the Linux(Fedora 12).
> > Then how can I xm create a XP DomU guest? Can anyone help?
> >
> > I am using Intel Q35 MB with Intel Core2 CPU.
>
>
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