Re: [Xen-users] Xen and megaraid Drivers CentOS 4

[James Bulpin <james@xxxxxxxxxxxxx>]

Andrew,

Any *binary* drivers supplied by a hardware vendor for a specific Linux 
distro will be for the (native) kernel that ships with that distro so 
won't generally work as-is with a Xen kernel.
SO we need to build the source. There are two options:

(1) use a driver in the Linux tree - I'm not sure if the current driver 
supports your particular card, perhaps someone else here can confirm? In 
fact I think our binary distribution has this already so if it doesn't 
work for you then the driver in 2.6.11 may not support your card.
(2) use source code supplied by LSI and build a module against the Xen 
kernel - this should generally work fine unless the vendor has cut 
corners with assumptions about the hardware platform.
To do (1):

 * download the Xen source distribution. It is easiest to do a "make 
world" first so that everything is in position.
 * change into the dom0 linux build directory: cd linux-2.6.11-xen0
 * reconfigure the kernel using (e.g.): make ARCH=xen xconfig
 * select the megaraid driver.
 * change directory back up a level
 * perform a make (*not* 'make world' as this will overwrite config 
changes)
 * reinstall the Xen0 kernel and modules

To do (2) *in general*:

 * unpack the driver source
 * see the driver documentation to find out how to point it at the 
kernel headers, point this at <path to you xen 
tree>/linux-2.6.11-xen0/include/linux
 * make ARCH=xen

LSI ship DKMS (http://linux.dell.com/projects.shtml#dkms) style source. 
I've got doubts as to how well this works with the build mechanism for 
Xen kernels so an alternative approach would be to manually merge the 
LSI source into the Xen0 build tree. I just tried this using the 
following command sequence (having downloaded dr_linux_2.20.4.6_as40.zip 
to /tmp):
MY_XEN_TREE=/local/xen-2.0.6-build
cd /tmp
unzip dr_linux_2.20.4.6_as40.zip
rpm2cpio \
  megaraid-v2.20.4.6-for-redhat-rhel-4-ga-kernel2.6.9-5.EL-x86.rpm \
  | cpio -idv
mv $MY_XEN_TREE/linux-2.6.11-xen0/drivers/scsi/megaraid \
  $MY_XEN_TREE/linux-2.6.11-xen0/drivers/scsi/megaraid.orig
cp -a /tmp/usr/src/megaraid-v2.20.4.6 \
  $MY_XEN_TREE/linux-2.6.11-xen0/drivers/scsi/megaraid

The follow the steps for (1) above. This builds cleanly for me but I 
don't have this hardware to test.
If you choose to build the driver as a module then you'll need to:

depmod -a 2.6.11.10-xen0
mkinitrd /boot/initrd-2.6.11.10-xen0.img 2.6.11.10-xen0

and add a grub module line for that initrd.

James

Andrew Turnbull wrote:
> Hi there
>
> I am managed to get Xen stable 2.0.6 working.
>
> I have 1 IDE (PATA) drive and 2 SATA drives connected to a Megaraid 300-8X.
>
> I have got everything working apart from I cannot figure out howto
> recompile the Xen Kernel with the support for the megaraid drivers in
> there.
>
> Furthermore I dont really know how to get the drivers into the correct
> place to compile them. I have never really messed around with Kernels
> before.
>
> The system is Centos 4, (RHEL 4) and the drivers are available on
> www.lsilogic.com for this distro.
>
> Thanks in advance
>
> _______________________________________________
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> Xen-users@xxxxxxxxxxxxxxxxxxx
> http://lists.xensource.com/xen-users
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