Re: [Xen-devel] PCI passthrough issue

[Jean Baptiste Favre <xen-devel@xxxxxxxxxxx>]

Hello,

Le 03/03/2011 23:12, Konrad Rzeszutek Wilk a écrit :
>>>> Lets do both. Do you know where the sources for OpenWRT are located?
>>>
>>> Openwrt .img and PV kernel are available at
>>> http://downloads.jbfavre.org/openwrt.tar.gz
> 
> Using that, and this xm file
> 
> kernel="/mnt/tmp/openwrt/openwrt-x86-xen_domu-vmlinuz"
> root='/dev/xvda2 rw'
> memory=256
> vcpus=1
> localtime=0
> disk=['phy:/dev/sdc,xvda,w']
> extra="console=hvc0 debug loglevel=10 iommu=soft"
> name="openwrt"
> on_crash="preserve"
> vfb = [ 'vnc=1, vnclisten=0.0.0.0,vncunused=1']
> pci = ['04:00.0']
> 
> where
> 04:00.0 Ethernet controller: Marvell Technology Group Ltd. 88E8056 PCI-E 
> Gigabit Ethernet Controller (rev 13)
> 
> I can't get the sky2 adapter to work at all.
> 
> Just to make sure it wasn't your build ...
>>>
>>> I'm making dd from my debian DomU and will upload it as debian.tar.gz at
>>> the same place. Will update you when completed.
>>>
>>> Openwrt source tree is available here:
>>> svn://svn.openwrt.org/openwrt/trunk
>>>
>>> You have all information to build it here:
>>> http://wiki.openwrt.org/doc/howto/build
>>>
>>> Or you have all steps I followed here:
>>> http://publications.jbfavre.org/virtualisation/xen_openwrt_domu_pci_passthrough.en
> 
> ... I tried to follow those directions and found that it would not work.
> I can't get the xen-pcifront.ko file at all on any of the *combined.img 
> images.
> 
> 
> I made this patch thinking it was due to the name of the module being 
> different:
> 
> Index: target/linux/x86/Makefile
> ===================================================================
> --- target/linux/x86/Makefile (revision 25855)
> +++ target/linux/x86/Makefile (working copy)
> @@ -12,7 +12,7 @@
>  FEATURES:=squashfs jffs2 ext4 vdi vmdk pcmcia targz
>  SUBTARGETS=generic olpc xen_domu ep80579 net5501 kvm_guest geos
>  
> -LINUX_VERSION:=2.6.32.29
> +LINUX_VERSION:=2.6.37
>  
>  include $(INCLUDE_DIR)/target.mk
>  
> Index: package/kernel/modules/virtual.mk
> ===================================================================
> --- package/kernel/modules/virtual.mk (revision 25855)
> +++ package/kernel/modules/virtual.mk (working copy)
> @@ -168,7 +168,7 @@
>    TITLE:=Xen PCI device frontend
>    DEPENDS:=@TARGET_x86_xen_domu @LINUX_2_6_37||LINUX_2_6_38
>    KCONFIG:=CONFIG_XEN_PCIDEV_FRONTEND
> -  FILES:=$(LINUX_DIR)/drivers/xen/platform-pci.ko
> +  FILES:=$(LINUX_DIR)/drivers/pci/xen-pcifront.ko
>    AUTOLOAD:=$(call AutoLoad,10,xen-pcifront)
>  endef
> 
> but it still would not include the xen-pcifront.ko file on the 
> *combined-ext4.img.gz
> file. Any ideas what I am doing wrong?

I don't remember such problem. Could this module be

BTW, I'm checking that rebuilding OpenWRT.

When you execute make menuconfig, choose Target=x86 and SubTarget="Xen
paravirt Guest". Then go to Kernel Modules -> Virtualisation Support
Xen PCI frontend is disabled by default. Did you activated it ?

OpenWRT global config cat be found in .config:
# grep xen -i .config
CONFIG_TARGET_x86_xen_domu=y
CONFIG_TARGET_x86_xen_domu_Default=y
CONFIG_DEFAULT_kmod-xen-evtchn=y
CONFIG_DEFAULT_kmod-xen-fs=y
CONFIG_DEFAULT_kmod-xen-kbddev=y
CONFIG_DEFAULT_kmod-xen-netdev=y
CONFIG_X86_GRUB_BOOTOPTS="xencons=hvc"
CONFIG_PACKAGE_kmod-xen-evtchn=y
# CONFIG_PACKAGE_kmod-xen-fbdev is not set
CONFIG_PACKAGE_kmod-xen-fs=y
CONFIG_PACKAGE_kmod-xen-kbddev=y
CONFIG_PACKAGE_kmod-xen-netdev=y
CONFIG_PACKAGE_kmod-xen-pcidev=y


Other way may be to fill target/linux/x86/xen_domu/config-default with
Xen CONFIG_* values. This will be used as kernel config

Regards,
JB

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