[Xen-devel] [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.

[Sander Eikelenboom <linux@xxxxxxxxxxxxxx>]

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

dom0-dmesg.txt
Description: Text document

dom0-lspci.txt
Description: Text document

dom0-lspci-tree.txt
Description: Text document

domU-dmesg.txt
Description: Text document

domU-lspci.txt
Description: Text document

xend.log
Description: Binary data

xm-dmesg.txt
Description: Text document

xm-info.txt
Description: Text document

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