Re: IO_PAGE_FAULT while booting.

[Joerg Roedel <joro@8bytes.org>]

On Fri, Jan 28, 2011 at 03:31:17PM +0000, Prasad Joshi wrote:
>On Fri, Jan 28, 2011 at 3:15 PM, Joerg Roedel <joro@8bytes.org> wrote:
>
>  On Thu, Jan 27, 2011 at 06:43:19PM +0000, Prasad Joshi wrote:
>  >    AMD-Vi: Event logged [IO_PAGE_FAULT device=02:00.0 domain=0x0002
>  >    address=0x00000000bb447000 flags=0x0000]
>  >    AMD-Vi: Event logged [IO_PAGE_FAULT device=02:00.0 domain=0x0002
>  >    address=0x00000000bb447040 flags=0x0000]
>  >    AMD-Vi: Event logged [IO_PAGE_FAULT device=02:00.0 domain=0x0002
>  >    address=0x00000000bb447080 flags=0x0000]
>
>  Hard to tell whats going wrong here. How many memory have you given to
>  the guest?
>
>I am allocating 1 GB memory to the VM

The address of the page-faults is around 3GB, so the guest sends DMA
commands to the GFX card which contains addresses outside its memory. I
Cc the list again, maybe they can bring some light into this issue.
In general GFX passthrough is not expected to work. But if it works for
you with -net none and doesn't without there must be another issue.

	Joerg

> 
>
>  What type of GFX card do you try to pass through?
>
># lspci -vvv
>02:00.0 VGA compatible controller: ATI Technologies Inc RV370 5B64 [FireGL
>V3100 (PCIE)] (rev 80) (prog-if 00 [VGA controller])
>    Subsystem: ATI Technologies Inc Device 0102
>    Interrupt: pin A routed to IRQ 32
>    Region 0: Memory at c0000000 (32-bit, prefetchable) [size=128M]
>    Region 1: I/O ports at a000 [size=256]
>    Region 2: Memory at f9cf0000 (32-bit, non-prefetchable) [size=64K]
>    Expansion ROM at f9cc0000 [disabled] [size=128K]
>
># dmidecode
>Handle 0x002E, DMI type 9, 17 bytes
>System Slot Information
>        Designation: PCIEX16_2
>        Type: 32-bit PCI Express
>        Current Usage: In Use
>        Length: Short
>        ID: 27
>        Characteristics:
>                3.3 V is provided
>                Opening is shared
>                PME signal is supported
>        Bus Address: ffff:02:00.0
>
> 
>
>         Joerg