RE: [Xen-devel] pci pass-through, NIC card

["Kay, Allen M" <allen.m.kay@xxxxxxxxx>]

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@xxxxxxxxxxxxx] 
>Sent: Friday, March 28, 2008 10:50 AM
>To: Kay, Allen M
>Cc: xen-devel@xxxxxxxxxxxxxxxxxxx
>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,
>
>-- 
>Jean Guyader
>

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