Re: [Xen-users] New to Xen

[Niels Dettenbach <nd@xxxxxxxxxxxx>]

Am Freitag, 11. November 2011, 12:36:43 schrieb J. Roeleveld:
> My main issue with the documentation is that I have not been able to find
> out which kernel-options are really needed for Xen 

This differs a bit between Dom0 and Domu and mainly between the "old" 2.6.38 
and the "new" (3.x - pvops) kernel. At least you have to enable all required 
XEN flags / drivers for backend or frontend.

If it helps you i can post a example kernel config fpr 2.6.38 (SuSe backport - 
sys-kernel/xen-sources in portage) i used properly (but you have to add your 
hardware drivers by your own). On 3.2 i'm still fiddeling here... ;)

On 2.6.38 i use the same kernel for Dom0 and DomU for testing purposes 
(preferred to compile in most instead of building as modules).

The kernel does not build if i enable CONFIG_XEN_BLKDEV_TAP2

It could be wise to build the CONFIG_BLK_DEV_LOOP as module which allows you 
to change the number of loopback devices later / on running sys.


--- snip ---
# XEN
CONFIG_XEN_PRIVILEGED_GUEST=y
CONFIG_XEN_PRIVCMD=y
CONFIG_XEN_DOMCTL=y
CONFIG_XEN_XENBUS_DEV=y
CONFIG_XEN_NETDEV_ACCEL_SFC_UTIL=m
CONFIG_XEN_BACKEND=y
CONFIG_XEN_BLKDEV_BACKEND=y
CONFIG_XEN_BLKDEV_TAP=y
# CONFIG_XEN_BLKDEV_TAP2 is not set
CONFIG_XEN_NETDEV_BACKEND=y
CONFIG_XEN_NETDEV_TX_SHIFT=8
# 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=m
CONFIG_XEN_SCSI_BACKEND=y
CONFIG_XEN_USB_BACKEND=m
CONFIG_XEN_BLKDEV_FRONTEND=y
CONFIG_XEN_NETDEV_FRONTEND=y
CONFIG_XEN_NETDEV_ACCEL_SFC_FRONTEND=m
CONFIG_XEN_SCSI_FRONTEND=y
CONFIG_XEN_USB_FRONTEND=y
# CONFIG_XEN_USB_FRONTEND_HCD_STATS is not set
# CONFIG_XEN_USB_FRONTEND_HCD_PM is not set
CONFIG_XEN_GRANT_DEV=y
CONFIG_XEN_DISABLE_SERIAL=y
CONFIG_XEN_SYSFS=y
CONFIG_XEN_NR_GUEST_DEVICES=256
CONFIG_XEN_COMPAT_030002_AND_LATER=y
# CONFIG_XEN_COMPAT_030004_AND_LATER is not set
# 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_040100_AND_LATER is not set
# CONFIG_XEN_COMPAT_LATEST_ONLY is not set
CONFIG_XEN_COMPAT=0x030002
CONFIG_XEN_SMPBOOT=y
CONFIG_XEN_DEVMEM=y
CONFIG_XEN_BALLOON=y
CONFIG_XEN_SCRUB_PAGES=y
CONFIG_XEN_DEV_EVTCHN=y
--- snap ---


you may "split" that into two kernels as described in the official Gentoo Xen 
howto.


> and how "xl" works as
> it's not a true drop-in-replacement for "xm".
This is true.

I mainly used

        xl help

for general overview and

        xl help <command> 

for a detailed description of each command here.

> Is "xend" still needed?
Yes (in Dom0).


cheers,


Niels.
-- 
---
Niels Dettenbach
Syndicat IT&Internet
http://www.syndicat.com/

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