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xen-devel
Re: [Xen-devel] RE: [pvops xen/next ][iommu] attenpt to passthrough PCI-
Pasi Kärkkäinen wrote:
On Mon, Mar 22, 2010 at 05:13:33PM +0800, Weidong Han wrote:
Pasi Kärkkäinen wrote:
On Mon, Mar 22, 2010 at 04:04:09PM +0800, Han, Weidong wrote:
The faults were caused by that the DMA address was not mapped in VT-d page
table.
Could you have following two tries:
1) assign it to pv domU without VT-d
Btw are there other methods of disabling VT-d PCI passhtru than having
iommu=off for xen.gz in grub.conf? ie. can you somehow select "use
normal PV passthru for this guest" and "but still use VT-d passthru for
this guest" ?
I'm not quite understand your point. do you mean use normal PV passthru
for pv guest, but still can passthru device to hvm guest? if so, current
xen VT-d already does like this.
Yeah, that's what I meant. Ok.
I thought it was also possible to use VT-d for a PV guest? no?
yes. you can use VT-d to assign device to pv guest. Sander was doing
that and encountered below issue.
Regards,
Weidong
-- Pasi
Regards,
Weidong
ps. I'm just writing a xen wiki page for PCI passthru and adding these things
and the common failure scenarios there.
-- Pasi
2) assign it to a hvm guest
Regards,
Weidong
-----Original Message-----
From: Sander Eikelenboom [mailto:linux@xxxxxxxxxxxxxx] Sent: Monday,
March 22, 2010 5:20 AM
To: Konrad Rzeszutek Wilk
Cc: Han, Weidong; xen-devel@xxxxxxxxxxxxxxxxxxx
Subject: [pvops xen/next ][iommu] attenpt to passthrough PCI-e usb controllor
to PV domU: (XEN) traps.c:2309:d1 Domain attempted WRMSR 000000000000008b from
00000a07:00000000 to 00000000:00000000.
Hi Han/Konrad,
In my setup i'm trying to passthrough an USB 3.0 pci-e controller to a PV domU.
- xen: 4.0.0-rc6
- dom0: kernel xen/next
- domU: kernel 2.6.33 from
git://git.kernel.org/pub/scm/linux/kernel/git/konrad/xen.git
( to have pci-front together with most recent usb3.0 xhci drivers.
- USB 3.0 xhci drivers work fine on the baremetal with the 2.6.33 kernel.
This is on a intel Q45 chipset with IOMMU.
This is my boot config:
title xen-4.0.0-rc6.gz / Debian GNU/Linux, kernel 2.6.32
root (hd0,0)
kernel /boot/xen-4.0.0-rc6.gz dom0_mem=768M loglvl=all
loglvl_guest=all iommu=pv iommu_inclusive_mapping=1
module /boot/vmlinuz-2.6.32 root=/dev/sda1 ro earlyprintk=xen
max_loop=255 xen-pciback.hide=(03:00.0)
module /boot/initrd.img-2.6.32
When booting the domU xm dmesg gets filled with the following when the usb
controller tries to initialize/:
(XEN) traps.c:2309:d1 Domain attempted WRMSR 000000000000008b from
00000a07:00000000 to 00000000:00000000.
(XEN) [VT-D]iommu.c:821: iommu_fault_status: Primary Pending Fault
(XEN) [VT-D]iommu.c:796: DMAR:[DMA Read] Request device [03:00.0] fault addr
1ff94000, iommu reg = ffff82c3fff54000
(XEN) DMAR:[fault reason 06h] PTE Read access is not set
(XEN) print_vtd_entries: iommu = ffff83007c866970 bdf = 3:0.0 gmfn = 1ff94
(XEN) root_entry = ffff83007c872000
(XEN) root_entry[3] = 78f56001
(XEN) context = ffff830078f56000
(XEN) context[0] = 101_2f0e1001
(XEN) l3 = ffff83002f0e1000
(XEN) l3_index = 0
(XEN) l3[0] = 2f0e0003
(XEN) l2 = ffff83002f0e0000
(XEN) l2_index = ff
(XEN) l2[ff] = 0
(XEN) l2[ff] not present
Anyone any tips on what i could try ?, is this something caused by xen, or
something by the usb driver not adhering to kernel DMA-api ?
Attached:
- xm-info.txt
- xm-dmesg.txt
- xend.log
- dom0-dmesg.txt
- dom0-lspci-tree.txt
- dom0-lspci.txt
- domU-lspci.txt
- domU-dmesg.txt
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