xen pci passthrough: pci bridge后面的pci设备

前几天弄到一块pci usb扩展卡，想要把它传递到vm里面，可是xen报错：

Error: pci: PCI Backend and pci-stub don't own sibling device 0000:00:00.0 of device 0000:0a:01.0

运行 “lspci -tv”得到：

-[0000:00]-+-00.0  Intel Corporation 2nd Generation Core Processor Family DRAM Controller
           +-01.0-[01]--+-00.0  Advanced Micro Devices [AMD] nee ATI Barts PRO [ATI Radeon HD 6800 Series]
           |            \-00.1  Advanced Micro Devices [AMD] nee ATI Barts HDMI Audio [Radeon HD 6800 Series]
           +-02.0  Intel Corporation 2nd Generation Core Processor Family Integrated Graphics Controller
           +-16.0  Intel Corporation 6 Series/C200 Series Chipset Family MEI Controller #1
           +-1a.0  Intel Corporation 6 Series/C200 Series Chipset Family USB Enhanced Host Controller #2
           +-1b.0  Intel Corporation 6 Series/C200 Series Chipset Family High Definition Audio Controller
           +-1c.0-[02]--
           +-1c.4-[03]----00.0  Marvell Technology Group Ltd. 88SE9120 SATA 6Gb/s Controller
           +-1c.5-[04]----00.0  Etron Technology, Inc. EJ168 USB 3.0 Host Controller
           +-1c.6-[05]----00.0  Etron Technology, Inc. EJ168 USB 3.0 Host Controller
           +-1c.7-[06-0f]----00.0-[07-0f]--+-01.0-[08]--
           |                               +-04.0-[09-0a]----00.0-[0a]--+-01.0  VIA Technologies, Inc. VT82xxxxx UHCI USB 1.1 Controller
           |                               |                            +-01.1  VIA Technologies, Inc. VT82xxxxx UHCI USB 1.1 Controller
           |                               |                            \-01.2  VIA Technologies, Inc. USB 2.0
           |                               +-05.0-[0b]----00.0  VIA Technologies, Inc. VT6315 Series Firewire Controller
           |                               +-06.0-[0c]----00.0  Broadcom Corporation NetLink BCM57781 Gigabit Ethernet PCIe
           |                               +-07.0-[0d]--
           |                               +-08.0-[0e]--
           |                               \-09.0-[0f]--
           +-1d.0  Intel Corporation 6 Series/C200 Series Chipset Family USB Enhanced Host Controller #1
           +-1f.0  Intel Corporation Z68 Express Chipset Family LPC Controller
           +-1f.2  Intel Corporation 6 Series/C200 Series Chipset Family SATA AHCI Controller
           \-1f.3  Intel Corporation 6 Series/C200 Series Chipset Family SMBus Controller

原来这个pci设备被安装在pci bridge后面了。好在xen-users里有人问过这个问题，也给出了workaround。详见：

http://old-list-archives.xen.org/archives/html/xen-users/2011-04/msg00211.html

简单来说就是把/usr/lib/xen-4.1/lib/python/xen/xend/server/pciif.py里面的几行注释掉。注释掉的内容是285行开始：

 if sdev.driver!='pciback' and sdev.driver!='pci-stub': 

 raise VmError(("pci: PCI Backend and pci-stub don't "+ \ 

 "own sibling device %s of device %s"\ 

 )%(sdev.name, dev.name))

暂时用起来没发现问题。

转载于:https://www.cnblogs.com/convolution/archive/2012/06/15/2550150.html