Re: PCI Passthrough not working

[Francis Greaves <francis@xxxxxxxxxxx>]

More information...

I have pcifront showing as a module in the DomU and the usb shows in dmesg as:

[    3.167543] usbcore: registered new interface driver usbfs
[    3.167563] usbcore: registered new interface driver hub
[    3.167585] usbcore: registered new device driver usb
[    3.196056] usb usb1: New USB device found, idVendor=1d6b, idProduct=0002
[    3.196060] usb usb1: New USB device strings: Mfr=3, Product=2, SerialNumber=1
[    3.196064] usb usb1: Product: EHCI Host Controller
[    3.196068] usb usb1: Manufacturer: Linux 3.2.0-4-686-pae ehci_hcd
[    3.196071] usb usb1: SerialNumber: 0000:00:00.0
[    3.508036] usb 1-1: new high-speed USB device number 2 using ehci_hcd
[   19.064072] usb 1-1: device not accepting address 2, error -110
[   19.176070] usb 1-1: new high-speed USB device number 3 using ehci_hcd
[   34.732067] usb 1-1: device not accepting address 3, error -110
[   34.844082] usb 1-1: new high-speed USB device number 4 using ehci_hcd
[   45.280073] usb 1-1: device not accepting address 4, error -110
[   45.392067] usb 1-1: new high-speed USB device number 5 using ehci_hcd
[   55.824112] usb 1-1: device not accepting address 5, error -110

I am looking at xl dmesg in Dom0 where there are some messages relating to the PCI usb:

[VT-D] It's disallowed to assign 0000:00:1a.0 with shared RMRR at 7b800000 for Dom6.
(XEN) XEN_DOMCTL_assign_device: assign 0000:00:1a.0 to dom6 failed (-1)
(XEN) [VT-D] It's risky to assign 0000:00:1a.0 with shared RMRR at 7b800000 for Dom7.
(XEN) [VT-D] It's risky to assign 0000:00:1a.0 with shared RMRR at 7b800000 for Dom8.
(XEN) [VT-D] It's risky to assign 0000:00:1a.0 with shared RMRR at 7b800000 for Dom9.
(XEN) [VT-D] It's risky to assign 0000:00:1a.0 with shared RMRR at 7b800000 for Dom10.

In the

as an aside... I just get blocks on the screen after the scrubbing message, and no text. I see there is a message:

(XEN) Xen is relinquishing VGA console.

How can I prevent this? Is there something wrong with my /etc/default/grub

...

GRUB_CMDLINE_LINUX="crashkernel=auto intremap=no_x2apic_optout"
GRUB_CMDLINE_XEN_DEFAULT="dom0_mem=13312M,max:14336M dom0_max_vcpus=6 dom0_vcpus_pin"
GRUB_GFXMODE=1024x768
GRUB_GFXPAYLOAD_LINUX=keep
GRUB_CMDLINE_LINUX_XEN_REPLACE_DEFAULT="console=hvc0 earlyprintk=xen"

Many thanks

Francis

---

From: "Francis Greaves" <francis@xxxxxxxxxxx>
To: "centos-virt" <centos-virt@xxxxxxxxxx>
Sent: Wednesday, 22 June, 2016 09:56:44
Subject: PCI Passthrough not working

Further to my messages back in May I have at last got round to trying to  get my DomU to recognise USB devices.

I am using Xen 4.6 with CentOS kernel 3.18.34-20.el7.x86_64.

I have to manually make the port available before creating the DomU by issuing the command:

xl pci-assignable-add 00:1a.0

otherwise nothing shows in:

xl pci-assignable-list

I have added this to my .cfg file as per the May Emails:

pci=['00:1a.0,rdm_policy=relaxed']

and in the DomU, which starts fine, I get the following information:

lspci
00:00.0 USB controller: Intel Corporation Wellsburg USB Enhanced Host Controller #2 (rev 05)
lsusb
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

However when I plug in a device to this USB port (Am sure it is the correct port in the Dom0) I see nothing in the DomU at all.

What can I do now?

Many thanks

Francis

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