[Xen-users] PCI Passthrough not working

[Francis Greaves <francis@xxxxxxxxxxx>]

I am having trouble getting PCI Passthrough to work from Dom0 running CentOS 7 to DomU runnning Debian 8
I am using Xen 4.6 with CentOS kernel 3.18.34-20.el7.x86_64 on a Dell Poweredge T430.
I think I have set it all up correctly, but I see no message when putting a USB device into any of the USB slots on the DomU
There are three other DomUs running, but I have no need of PCI Passthrough set up for them.

kernel command line on Dom0 from /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 xen-pciback.passthrough=1 irqpoll
GRUB_CMDLINE_LINUX_XEN_REPLACE_DEFAULT="console=hvc0 earlyprintk=xen"

lspci on Dom0 filtered for USB
00:1a.0 USB controller: Intel Corporation C610/X99 series chipset USB Enhanced Host Controller #2 (rev 05)
00:1d.0 USB controller: Intel Corporation C610/X99 series chipset USB Enhanced Host Controller #1 (rev 05)

lsmod on Dom0 filtered for xen
xenfs                  12978  1
xen_privcmd            13243  12 xenfs
xen_pciback            52127  0
xen_netback            45777  6
xen_blkback            31807  0
xen_gntalloc           13144  0
xen_gntdev             17468  2
xen_evtchn             13033  5


config file for DomU
==============================================================

# Kernel command line options
extra = "root=/dev/xvda1 swiotlb=force"

memory = 2048
vcpus = 2
vif = ['mac=00:16:3E:00:00:35, bridge=xenbr5', 'mac=00:16:3E:00:00:36, bridge=xenbr6']
disk = ['phy:/dev/xen_vg/metsat_disk,xvda,w', 'phy:/dev/xen_vg/metsat_swap,xvdb,w', 'phy:/dev/xen_vg/metsat_receive,xvdc,w']
pci=['00:1a.0,rdm_policy=relaxed,permissive=1,seize=1']
_on_poweroff_ = 'destroy'
on_reboot   = 'restart'
on_crash    = 'restart'
# Run section ==============================================================
bootloader = "/usr/lib/xen/bin/pygrub"
==============================================================

In the Dom0 I get this when booting the DomU, even with irqpoll in the DomU kernel line

xen_pciback: xen-pciback[0000:00:1a.0] IRQ line is not shared with other domains. Turning ISR off
Jul 03 11:31:23 myDom0.mynetwork.net kernel: irq 18: nobody cared (try booting with the "irqpoll" option)
Jul 03 11:31:23 myDom0.mynetwork.net kernel: CPU: 0 PID: 0 Comm: swapper/0 Not tainted 3.18.34-20.el7.x86_64 #1
Jul 03 11:31:23 myDom0.mynetwork.net kernel: Hardware name: Dell Inc. PowerEdge T430/0975F3, BIOS 1.5.4 10/05/2015
Jul 03 11:31:23 myDom0.mynetwork.net kernel:  0000000000000000 ffff8803bc603d88 ffffffff81653783 ffff8803b223e400
Jul 03 11:31:23 myDom0.mynetwork.net kernel:  ffff8803b223e48c ffff8803bc603db8 ffffffff810c6776 ffff8803bc613340
Jul 03 11:31:23 myDom0.mynetwork.net kernel:  ffff8803b223e400 0000000000000012 0000000000000000 ffff8803bc603e08
Jul 03 11:31:23 myDom0.mynetwork.net kernel: Call Trace:
Jul 03 11:31:23 myDom0.mynetwork.net kernel:  <IRQ>  [<ffffffff81653783>] dump_stack+0x64/0x82
Jul 03 11:31:23 myDom0.mynetwork.net kernel:  [<ffffffff810c6776>] __report_bad_irq+0x36/0xd0
Jul 03 11:31:23 myDom0.mynetwork.net kernel:  [<ffffffff810c6c86>] note_interrupt+0x226/0x270
Jul 03 11:31:23 myDom0.mynetwork.net kernel:  [<ffffffff813e71cc>] ? add_interrupt_randomness+0x3c/0x1f0
Jul 03 11:31:23 myDom0.mynetwork.net kernel:  [<ffffffff810c43ec>] handle_irq_event_percpu+0xcc/0x1e0
Jul 03 11:31:23 myDom0.mynetwork.net kernel:  [<ffffffff810c453b>] handle_irq_event+0x3b/0x60

Message from syslogd@myDom0 at Jul  3 11:31:23 ...
 kernelisabling IRQ #18
Jul 03 11:31:23 myDom0.mynetwork.net kernel:  [<ffffffff810c709a>] handle_fasteoi_irq+0x7a/0x130
Jul 03 11:31:23 myDom0.mynetwork.net kernel:  [<ffffffff810c394b>] generic_handle_irq+0x2b/0x40
Jul 03 11:31:23 myDom0.mynetwork.net kernel:  [<ffffffff813a2102>] evtchn_fifo_handle_events+0x162/0x170
Jul 03 11:31:23 myDom0.mynetwork.net kernel:  [<ffffffff8139efb0>] __xen_evtchn_do_upcall+0x50/0x90
Jul 03 11:31:23 myDom0.mynetwork.net kernel:  [<ffffffff813a0d67>] xen_evtchn_do_upcall+0x37/0x50
Jul 03 11:31:23 myDom0.mynetwork.net kernel:  [<ffffffff8165c05e>] xen_do_hypervisor_callback+0x1e/0x40
Jul 03 11:31:23 myDom0.mynetwork.net kernel:  <EOI>  [<ffffffff810013aa>] ? xen_hypercall_sched_op+0xa/0x20
Jul 03 11:31:23 myDom0.mynetwork.net kernel:  [<ffffffff810013aa>] ? xen_hypercall_sched_op+0xa/0x20
Jul 03 11:31:23 myDom0.mynetwork.net kernel:  [<ffffffff8100b330>] ? xen_safe_halt+0x10/0x20
Jul 03 11:31:23 myDom0.mynetwork.net kernel:  [<ffffffff8101ea94>] ? default_idle+0x24/0xf0
Jul 03 11:31:23 myDom0.mynetwork.net kernel:  [<ffffffff8101f49f>] ? arch_cpu_idle+0xf/0x20
Jul 03 11:31:23 myDom0.mynetwork.net kernel:  [<ffffffff810adc92>] ? cpu_startup_entry+0x312/0x3e0
Jul 03 11:31:23 myDom0.mynetwork.net kernel:  [<ffffffff816445c7>] ? rest_init+0x77/0x80
Jul 03 11:31:23 myDom0.mynetwork.net kernel:  [<ffffffff81d77130>] ? start_kernel+0x4d0/0x4dd
Jul 03 11:31:23 myDom0.mynetwork.net kernel:  [<ffffffff81d76a50>] ? set_init_arg+0x55/0x55
Jul 03 11:31:23 myDom0.mynetwork.net kernel:  [<ffffffff81d765ee>] ? x86_64_start_reservations+0x2a/0x2c
Jul 03 11:31:23 myDom0.mynetwork.net kernel:  [<ffffffff81d7a7cc>] ? xen_start_kernel+0x5a9/0x5b5
Jul 03 11:31:23 myDom0.mynetwork.net kernel: handlers:
Jul 03 11:31:23 myDom0.mynetwork.net kernel: [<ffffffff814b0f50>] usb_hcd_irq
Jul 03 11:31:23 myDom0.mynetwork.net kernel: [<ffffffffa050d3e0>] xen_pcibk_guest_interrupt [xen_pciback]
Jul 03 11:31:23 myDom0.mynetwork.net kernel: Disabling IRQ #18

=========================================================================

on the DomU

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

dmesg | grep usb
[    3.190569] usbcore: registered new interface driver usbfs
[    3.190584] usbcore: registered new interface driver hub
[    3.190606] usbcore: registered new device driver usb
[    3.220057] usb usb1: New USB device found, idVendor=1d6b, idProduct=0002
[    3.220062] usb usb1: New USB device strings: Mfr=3, Product=2, SerialNumber=1
[    3.220067] usb usb1: Product: EHCI Host Controller
[    3.220070] usb usb1: Manufacturer: Linux 3.2.0-4-686-pae ehci_hcd
[    3.220073] usb usb1: SerialNumber: 0000:00:00.0
[    3.532049] usb 1-1: new high-speed USB device number 2 using ehci_hcd
[   19.088071] usb 1-1: device not accepting address 2, error -110
[   19.200069] usb 1-1: new high-speed USB device number 3 using ehci_hcd
[   34.756077] usb 1-1: device not accepting address 3, error -110
[   34.868111] usb 1-1: new high-speed USB device number 4 using ehci_hcd
[   45.300055] usb 1-1: device not accepting address 4, error -110
[   45.412076] usb 1-1: new high-speed USB device number 5 using ehci_hcd
[   55.844113] usb 1-1: device not accepting address 5, error -110

lsmod | grep xen
xen_pcifront           17330  0
xen_blkfront           17198  6
xen_netfront           21736  0

-----------------------------------------------------------------------------------------

Does anyone have any ideas about this?
Many thanks
Francis

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