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xen-devel
Re: [Xen-devel] pci pass-through, NIC card
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To: |
"Kay, Allen M" <allen.m.kay@xxxxxxxxx> |
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Subject: |
Re: [Xen-devel] pci pass-through, NIC card |
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From: |
Jean Guyader <jean.guyader@xxxxxxxxxxxxx> |
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Date: |
Mon, 31 Mar 2008 17:59:12 +0100 |
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Cc: |
"Li, Haicheng" <haicheng.li@xxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxx, "Han, Weidong" <weidong.han@xxxxxxxxx>, Ian Pratt <Ian.Pratt@xxxxxxxxxxxxx>, "You, Yongkang" <yongkang.you@xxxxxxxxx>, Keir Fraser <keir.fraser@xxxxxxxxxxxxx> |
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Mon, 31 Mar 2008 10:00:24 -0700 |
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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@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,
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
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