Re: [Xen-devel] how to PCI-passthrough 1 card to a DomU when another @ Dom0 uses the same driver?

["dev001" <pgngw+dev001+xen-users@xxxxxx>]

hi,

> readlink //sys/bus/pci/devices/0000:04:00.0/driver
> ../../../../bus/pci/drivers/pciback
> 
> I want you to do for 02:00.0 and see if it points to pciback before you
> launch any guests. 

thanks for clarifying that.

not exhaustive, but hopefully sufficiently informative,

grep PCI /boot/config-2.6.34.8-8-xen | grep BACK
        CONFIG_XEN_PCIDEV_BACKEND=m
        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_BACKEND_CONTROLLER is not set

lspci | grep -i eth
        02:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd.
        RTL8111/8168B PCI Express Gigabit Ethernet controller (rev 01)
        03:00.0 Ethernet controller: Marvell Technology Group Ltd.
        88E8053 PCI-E Gigabit Ethernet Controller (rev 20)
        04:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd.
        RTL8111/8168B PCI Express Gigabit Ethernet controller (rev 02)

######################
case 1)

grep pci /boot/grub/menu.lst
    module /vmlinuz-xen ...
    pci=resource_aligment=0000:02:00.0;0000:03:0.0

cat /etc/init.d/boot.local
        (empty)

cat /etc/modprobe.d/99-local.conf
        options pciback hide=(0000:02:00.0)(0000:03:00.0)
        install sky2       /sbin/modprobe pciback ; /sbin/modprobe
        --first-time --ignore-install sky2
        install r8169      /sbin/modprobe pciback ; /sbin/modprobe
        --first-time --ignore-install r8169

reboot
dmesg | grep -i seiz
        (empty)

readlink //sys/bus/pci/devices/0000:02:00.0/driver
        ../../../../bus/pci/drivers/r8169
readlink //sys/bus/pci/devices/0000:03:00.0/driver
        ../../../../bus/pci/drivers/sky2
readlink //sys/bus/pci/devices/0000:04:00.0/driver
        ../../../../bus/pci/drivers/r8169

######################
case 2)

grep pci /boot/grub/menu.lst
    module /vmlinuz-xen ...
    pci=resource_aligment=0000:02:00.0;0000:03:0.0
    pciback.hide=(0000:02:00.0)(0000:03:00.0)

cat /etc/init.d/boot.local
        (empty)

cat /etc/modprobe.d/99-local.conf
        options pciback hide=(0000:02:00.0)(0000:03:00.0)
        install sky2       /sbin/modprobe pciback ; /sbin/modprobe
        --first-time --ignore-install sky2
        install r8169      /sbin/modprobe pciback ; /sbin/modprobe
        --first-time --ignore-install r8169

reboot
dmesg | grep -i seiz
        [    2.083424] pciback 0000:03:00.0: seizing device

readlink //sys/bus/pci/devices/0000:02:00.0/driver
        ../../../../bus/pci/drivers/r8169
readlink //sys/bus/pci/devices/0000:03:00.0/driver
        ../../../../bus/pci/drivers/pciback
readlink //sys/bus/pci/devices/0000:04:00.0/driver
        ../../../../bus/pci/drivers/r8169

######################
case 3)

grep pci /boot/grub/menu.lst
    module /vmlinuz-xen ...
    pci=resource_aligment=0000:02:00.0;0000:03:0.0
    pciback.hide=(0000:02:00.0)(0000:03:00.0)

cat /etc/init.d/boot.local
        (empty)

cat /etc/modprobe.d/99-local.conf
        (empty)

reboot
dmesg | grep -i seiz
        [    2.077673] pciback 0000:03:00.0: seizing device

readlink //sys/bus/pci/devices/0000:02:00.0/driver
        ../../../../bus/pci/drivers/r8169
readlink //sys/bus/pci/devices/0000:03:00.0/driver
        ../../../../bus/pci/drivers/pciback
readlink //sys/bus/pci/devices/0000:04:00.0/driver
        ../../../../bus/pci/drivers/r8169

######################
case 3)

grep pci /boot/grub/menu.lst
    module /vmlinuz-xen ...
    pci=resource_aligment=0000:02:00.0;0000:03:0.0

cat /etc/init.d/boot.local
        DEV="0000:02:00.0 0000:03:00.0"
        for BDF in $DEV 
        do 
            [ ! -e /sys/bus/pci/devices/$BDF/driver/unbind ] || \
                    echo -n $BDF >
                    /sys/bus/pci/devices/$BDF/driver/unbind
            echo -n $BDF > /sys/bus/pci/drivers/pciback/new_slot
            echo -n $BDF > /sys/bus/pci/drivers/pciback/bind
            echo -n $BDF > sys/bus/pci/drivers/pciback/permissive
        done 

cat /etc/modprobe.d/99-local.conf
        (empty)

reboot
dmesg | grep -i seiz
        [   32.664674] pciback 0000:02:00.0: seizing device
        [   32.688310] pciback 0000:03:00.0: seizing device

readlink //sys/bus/pci/devices/0000:02:00.0/driver
        ../../../../bus/pci/drivers/pciback
readlink //sys/bus/pci/devices/0000:03:00.0/driver
        ../../../../bus/pci/drivers/pciback
readlink //sys/bus/pci/devices/0000:04:00.0/driver
        ../../../../bus/pci/drivers/r8169








> >  CONFIG_XEN_PCIDEV_BACKEND=m      <--------------------
> 
> Pfff.. sucks.

curious, why?  and if it legitimately does, any clue why @opensuse does
it that way?

> > > What happens if you 'rmmod sky2' or blacklist the sky2 driver?

i assume a still relevant question ... so, try this for which of the
above (or other?) cases?

thanks.

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