[Xen-users] PCI Passthrough with kernel.org domU kernel

[DeadManMoving <sequel@xxxxxxxxxxxx>]

Hi list,

i'd like to know if PCI Passthrough is suppose to work with kernel.org
kernel linux-2.6.36-rc8.

I'm using linux-2.6.34-xen-r4 from gentoo as kernel for dom0.

>From what i've seen on the list, it should but, i'm not able to get it
work.

However, i'm able to get it work if i also use linux-2.6.34-xen-r4 from
gentoo as kernel for domU.



Here's the relevant kernel config section for my dom0 kernel :


# Linux kernel version: 2.6.34-xen-r4
CONFIG_X86_64_XEN=y
CONFIG_SWIOTLB=y
CONFIG_IOMMU_HELPER=y
# CONFIG_IOMMU_API is not set
CONFIG_X86_XEN_MCE=y
CONFIG_XEN_PCIDEV_FRONTEND=y
# CONFIG_XEN_PCIDEV_FE_DEBUG is not set
CONFIG_XEN=y
CONFIG_XEN_INTERFACE_VERSION=0x00030207
# 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=y
CONFIG_XEN_BLKDEV_TAP=y
CONFIG_XEN_BLKDEV_TAP2=y
CONFIG_XEN_BLKBACK_PAGEMAP=y
CONFIG_XEN_NETDEV_BACKEND=y
CONFIG_XEN_NETDEV_TX_SHIFT=8
# CONFIG_XEN_NETDEV_PIPELINED_TRANSMITTER is not set
CONFIG_XEN_NETDEV_LOOPBACK=y
CONFIG_XEN_PCIDEV_BACKEND=y
# CONFIG_XEN_PCIDEV_BACKEND_VPCI is not set
CONFIG_XEN_PCIDEV_BACKEND_PASS=y
# CONFIG_XEN_PCIDEV_BACKEND_SLOT is not set
# CONFIG_XEN_PCIDEV_BACKEND_CONTROLLER is not set
# CONFIG_XEN_PCIDEV_BE_DEBUG is not set
# CONFIG_XEN_TPMDEV_BACKEND is not set
CONFIG_XEN_SCSI_BACKEND=y
CONFIG_XEN_USB_BACKEND=y
# CONFIG_XEN_BLKDEV_FRONTEND is not set
# CONFIG_XEN_NETDEV_FRONTEND is not set
# CONFIG_XEN_SCSI_FRONTEND is not set
# CONFIG_XEN_USB_FRONTEND is not set
CONFIG_XEN_GRANT_DEV=y
# CONFIG_XEN_FRAMEBUFFER is not set
CONFIG_XEN_DISABLE_SERIAL=y
CONFIG_XEN_SYSFS=y
CONFIG_XEN_NR_GUEST_DEVICES=256
# CONFIG_XEN_COMPAT_030002_AND_LATER is not set
CONFIG_XEN_COMPAT_030004_AND_LATER=y
# CONFIG_XEN_COMPAT_030100_AND_LATER is not set
# CONFIG_XEN_COMPAT_030200_AND_LATER is not set
# CONFIG_XEN_COMPAT_030300_AND_LATER is not set
# CONFIG_XEN_COMPAT_030400_AND_LATER is not set
# CONFIG_XEN_COMPAT_040000_AND_LATER is not set
# CONFIG_XEN_COMPAT_LATEST_ONLY is not set
CONFIG_XEN_COMPAT=0x030004
CONFIG_XEN_SMPBOOT=y
CONFIG_XEN_DEVMEM=y
# Xen driver support
CONFIG_XEN_BALLOON=y
CONFIG_XEN_SCRUB_PAGES=y
CONFIG_XEN_DEV_EVTCHN=y
# CONFIG_IOMMU_STRESS is not set



Here's the relevant kernel config section for my domU kernel
linux-2.6.34-xen-r4 from gentoo (i have a working PCI Passthrough setup
with this one) :


# Linux kernel version: 2.6.34-xen-r4
CONFIG_X86_64_XEN=y
CONFIG_SWIOTLB=y
CONFIG_IOMMU_HELPER=y
# CONFIG_IOMMU_API is not set
CONFIG_XEN_PCIDEV_FRONTEND=y
# CONFIG_XEN_PCIDEV_FE_DEBUG is not set
# CONFIG_NETXEN_NIC is not set
CONFIG_XEN=y
CONFIG_XEN_INTERFACE_VERSION=0x00030207
# XEN
# CONFIG_XEN_PRIVILEGED_GUEST is not set
CONFIG_XEN_UNPRIVILEGED_GUEST=y
CONFIG_XEN_PRIVCMD=y
CONFIG_XEN_XENBUS_DEV=y
# CONFIG_XEN_BACKEND is not set
CONFIG_XEN_BLKDEV_FRONTEND=y
CONFIG_XEN_NETDEV_FRONTEND=y
# CONFIG_XEN_NETDEV_ACCEL_SFC_FRONTEND is not set
CONFIG_XEN_SCSI_FRONTEND=y
# CONFIG_XEN_USB_FRONTEND is not set
CONFIG_XEN_FRAMEBUFFER=y
CONFIG_XEN_KEYBOARD=y
CONFIG_XEN_DISABLE_SERIAL=y
CONFIG_XEN_SYSFS=y
CONFIG_XEN_NR_GUEST_DEVICES=16
# CONFIG_XEN_COMPAT_030002_AND_LATER is not set
CONFIG_XEN_COMPAT_030004_AND_LATER=y
# CONFIG_XEN_COMPAT_030100_AND_LATER is not set
# CONFIG_XEN_COMPAT_030200_AND_LATER is not set
# CONFIG_XEN_COMPAT_030300_AND_LATER is not set
# CONFIG_XEN_COMPAT_030400_AND_LATER is not set
# CONFIG_XEN_COMPAT_040000_AND_LATER is not set
# CONFIG_XEN_COMPAT_LATEST_ONLY is not set
CONFIG_XEN_COMPAT=0x030004
CONFIG_XEN_SMPBOOT=y
CONFIG_XEN_DEVMEM=y
# Xen driver support
CONFIG_XEN_BALLOON=y
CONFIG_XEN_SCRUB_PAGES=y
# CONFIG_XEN_DEV_EVTCHN is not set
# CONFIG_IOMMU_STRESS is not set


And finally, here's the relevant kernel config section for my domU
kernel linux-2.6.36-rc8 (from kernel.org, which is not working for PCI
Passthrough) :

CONFIG_XEN=y
CONFIG_XEN_PVHVM=y
CONFIG_XEN_MAX_DOMAIN_MEMORY=32
CONFIG_XEN_SAVE_RESTORE=y
# CONFIG_XEN_DEBUG_FS is not set
CONFIG_GART_IOMMU=y
# CONFIG_CALGARY_IOMMU is not set
# CONFIG_AMD_IOMMU is not set
CONFIG_SWIOTLB=y
CONFIG_IOMMU_HELPER=y
CONFIG_IOMMU_API=y
CONFIG_XEN_BLKDEV_FRONTEND=y
# CONFIG_NETXEN_NIC is not set
CONFIG_XEN_NETDEV_FRONTEND=y
CONFIG_XEN_KBDDEV_FRONTEND=y
CONFIG_HVC_XEN=y
CONFIG_XEN_FBDEV_FRONTEND=y
# Xen driver support
CONFIG_XEN_BALLOON=y
CONFIG_XEN_SCRUB_PAGES=y
CONFIG_XEN_DEV_EVTCHN=y
CONFIG_XENFS=y
CONFIG_XEN_COMPAT_XENFS=y
CONFIG_XEN_SYS_HYPERVISOR=y
CONFIG_XEN_PLATFORM_PCI=y
CONFIG_SWIOTLB_XEN=y
# CONFIG_IOMMU_DEBUG is not set
# CONFIG_IOMMU_STRESS is not set


I have pulled Konrad kernel v2.6.36-rc7 from git and everything under
drivers/xen/ seem identical to what's under drivers/xen/ in kernel.org
linux-2.6.36-rc8.

Maybe the culprit is the dom0 kernel linux-2.6.34-xen-r4 from gentoo,
which cannot be compatible for PCI Passthrough with pvops upstream
kernel.org Linux 2.6.3x?


Any help or hints would be greatly appreciated.

Thanks and regards,

Tony Lapointe



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