[Xen-users] Re: About NIC passthrough to the guest system

[Christian Tramnitz <chris.ace@xxxxxxx>]

When running hvm you need vt-d support to pass-through devices.
Apart from that I doubt that you will be able to passthrough one port of 
a dual-port nic, you may have to pass-through the whole card.
Best regards,
   Christian

Alex Chan wrote:
> Hi,
>         I very confuse how to make xen PCI passthrough to guest. I 
> follow everything but still cannot get the PCI in the guest. Please 
> help, thanks.
>  
> HOST: CentOS 5.3
> Kernel : 2.6.18-128.1.6.el5xen
> xen: xen-3.0.3-80.el5
>  
> [root@hm02 xen]# lspci | grep Ethernet
> 03:00.0 Ethernet controller: Broadcom Corporation NetXtreme II BCM5708 
> Gigabit Ethernet (rev 12)
> 07:00.0 Ethernet controller: Broadcom Corporation NetXtreme II BCM5708 
> Gigabit Ethernet (rev 12)
> 08:00.0 Ethernet controller: Intel Corporation 82571EB Gigabit Ethernet 
> Controller (rev 06)
> 08:00.1 Ethernet controller: Intel Corporation 82571EB Gigabit Ethernet 
> Controller (rev 06)
> 0a:00.0 Ethernet controller: Intel Corporation 82571EB Gigabit Ethernet 
> Controller (rev 06)
> 0a:00.1 Ethernet controller: Intel Corporation 82571EB Gigabit Ethernet 
> Controller (rev 06)
> 0d:00.0 Ethernet controller: Broadcom Corporation NetXtreme II BCM5708 
> Gigabit Ethernet (rev 12)
>  
> I need "0a:00.1" to passthrough to the guest system.
>  
>  
> [root@hm02 xen]# cat /etc/modprobe.conf
> options pciback hide=(0a:00.1)
> alias eth0 bnx2
> alias eth1 bnx2
> alias eth2 bnx2
> alias eth3 e1000e
> alias eth4 e1000e
> alias eth5 e1000e
> alias eth6 e1000e
> alias scsi_hostadapter megaraid_sas
> alias scsi_hostadapter1 ata_piix
> alias scsi_hostadapter2 usb-storage
>  
> [root@hm02 xen]# dmesg | grep pciback
> pciback 0000:0a:00.1: seizing device
> pciback 0000:0a:00.1: enabling permissive mode configuration space accesses!
> pciback 0000:0a:00.1: permissive mode is potentially unsafe!
> pciback: vpci: 0000:0a:00.1: assign to virtual slot 0
>  
> [root@hm02 xen]# cat xen-test
> name = "xen-test"
> uuid = "cad318b5-be8b-2a75-bd02-9fad747f9e04"
> maxmem = 1024
> memory = 1024
> vcpus = 1
> builder = "hvm"
> kernel = "/usr/lib/xen/boot/hvmloader"
> boot = "c"
> pae = 1
> acpi = 1
> apic = 1
> localtime = 0
> on_poweroff = "destroy"
> on_reboot = "restart"
> on_crash = "restart"
> device_model = "/usr/lib64/xen/bin/qemu-dm"
> sdl = 0
> vnc = 1
> vncunused = 1
> keymap = "en-us"
> disk = [ "file:/xen/xen-test.img,hda,w", ",hdc:cdrom,r" ]
> vif = [ "mac=00:16:3e:0f:f9:e5,bridge=xenbr5" ]
> pci = [ "0000:0a:00.1" ] or pci = [ "0a:00.1" ]
> serial = "pty"
>  
> [root@hm02 xen]# cat /boot/config-2.6.18-128.1.6.el5xen | grep XEN
> CONFIG_X86_64_XEN=y
> CONFIG_X86_XEN_GENAPIC=y
> CONFIG_XEN_PCIDEV_FRONTEND=y
> # CONFIG_XEN_PCIDEV_FE_DEBUG is not set
> CONFIG_NETXEN_NIC=m
> CONFIG_XEN=y
> CONFIG_XEN_INTERFACE_VERSION=0x00030203
> # XEN
> CONFIG_XEN_PRIVILEGED_GUEST=y
> # CONFIG_XEN_UNPRIVILEGED_GUEST is not set
> CONFIG_XEN_PRIVCMD=y
> CONFIG_XEN_XENBUS_DEV=y
> CONFIG_XEN_BACKEND=y
> CONFIG_XEN_BLKDEV_BACKEND=m
> CONFIG_XEN_BLKDEV_TAP=m
> CONFIG_XEN_NETDEV_BACKEND=m
> # CONFIG_XEN_NETDEV_PIPELINED_TRANSMITTER is not set
> CONFIG_XEN_NETDEV_LOOPBACK=m
> CONFIG_XEN_PCIDEV_BACKEND=y
> CONFIG_XEN_PCIDEV_BACKEND_VPCI=y
> # CONFIG_XEN_PCIDEV_BACKEND_PASS is not set
> # CONFIG_XEN_PCIDEV_BACKEND_SLOT is not set
> # CONFIG_XEN_PCIDEV_BE_DEBUG is not set
> # CONFIG_XEN_TPMDEV_BACKEND is not set
> CONFIG_XEN_BLKDEV_FRONTEND=m
> CONFIG_XEN_NETDEV_FRONTEND=m
> CONFIG_XEN_FRAMEBUFFER=y
> CONFIG_XEN_KEYBOARD=y
> CONFIG_XEN_SCRUB_PAGES=y
> # CONFIG_XEN_DISABLE_SERIAL is not set
> CONFIG_XEN_SYSFS=y
> CONFIG_XEN_COMPAT_030002_AND_LATER=y
> # CONFIG_XEN_COMPAT_LATEST_ONLY is not set
> CONFIG_XEN_COMPAT_030002=y
> CONFIG_XEN_UTIL=y
> CONFIG_XEN_BALLOON=y
> CONFIG_XEN_DEVMEM=y
> CONFIG_XEN_SKBUFF=y
> CONFIG_XEN_REBOOT=y
> CONFIG_XEN_SMPBOOT=y
> [root@hm02 xen]#
> In the guest:
>  
> [root@xen-test ~]# lspci
> 00:00.0 Host bridge: Intel Corporation 440FX - 82441FX PMC [Natoma] (rev 02)
> 00:01.0 ISA bridge: Intel Corporation 82371SB PIIX3 ISA [Natoma/Triton II]
> 00:01.1 IDE interface: Intel Corporation 82371SB PIIX3 IDE 
> [Natoma/Triton II]
> 00:01.2 Bridge: Intel Corporation 82371AB/EB/MB PIIX4 ACPI (rev 01)
> 00:02.0 VGA compatible controller: Cirrus Logic GD 5446
> 00:03.0 Class ff80: XenSource, Inc. Xen Platform Device (rev 01)
> 00:04.0 Ethernet controller: Realtek Semiconductor Co., Ltd. 
> RTL-8139/8139C/8139C+ (rev 20)
> I still cannot see the PCI passthrough, please help to see where I 
> missed, thank you so much.
> Best Regards
> Alex
>
>
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>
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