Re: pci pass-through, NIC card

[Jean Guyader <jean.guyader@eu.citrix.com>]

Kay, Allen M wrote:
> I would assume you see "Intel VT-d has been enabled" in you full log
> file, correct?
> 
> Given that dom0 devices are working OK - this means VT-d translation is
> working correctly for dom0.
> 
> The current code maps entire guest memory in VT-d by sharing with p2m
> table.  The vt-d page fault you are seeing should only happen if the
> guest is using some DMA address that is not coverred by the P2m page
> table - which is shouldn't have happened.
> 
> I have seen this type of fault if the BIOS is not programming VT-d HW
> correctly.
> 
> Who's the vendor of this Stoakley system?  We can try to duplicate the
> problem here if we can get hold of the same system.
> 
> Allen
> 
>> -----Original Message-----
>> From: Jean Guyader [mailto:jean.guyader@eu.citrix.com] 
>> Sent: Friday, March 28, 2008 10:50 AM
>> To: Kay, Allen M
>> Cc: xen-devel@lists.xensource.com
>> Subject: Re: [Xen-devel] pci pass-through, NIC card
>>
>> Kay, Allen M wrote:
>>> Does this happen during xen/dom0 boot time or during HVM guest boot?
>>>
>>> Are you using and desktop or server platform?  Are you using 
>> the latest
>>> BIOS?  Some older BIOS does not initialize VT-d HW properly.
>>>
>>> Allen
>>>
>> It's a server platform, I could indeed check if it is the latest bios.
>>
>> This is happen during the HVM guest boot, all initialisation 
>> in dom0 are 
>> ok. The device I tried to pass-through was a pci NIC.
>>
>> I have tried to pass-through a PCIe NIC and it works better, I 
>> mean the 
>> hvm guest boot. The NIC card is well detected by the hvm guest but, 
>> there is still a problem. When I tried to get an ip address 
>>from dhcp I 
>> received a storm of "iommu_page_fault" (enclosed the log).
>>
>> The pci device I try to pass-through is at the address 8:0:0.
>>
>> I have disable the pci msi in the guest.
>>
>> Thanks,
>>

May be it fails because, the NIC I tried to pass-through is not a PCie 
e1000 card. The MIC card is a 82575EB and it works fine in dom0 with the 
igb driver (http://sourceforge.net/project/showfiles.php?group_id=42302).

-- 
Jean Guyader