RE: [Xen-devel] RE: [Xen-users] (Xenlinux) gentoo-xen-kernel patches questions?

[Mike Viau <viaum@xxxxxxxxxxxxxxx>]

Fri, 2 Apr 2010 17:21:35 -0700 <bderzhavets@xxxxxxxxx> wrote:

>>Would compiling the pv_ops kernel from the git repository produce any additional stability?

>Good question. It completely depends on speed of your internet connection
and :-
># git checkout -b xen/linux-2.6.32.X-stable  origin/xen/linux-2.6.32.X-stable
># make menuconfig ( to enable Xen Dom0 support)
># make -j(x)number_of_cores
># make modules_install install
># mkinitramfs -o /boot/initrd-2.6.32.10.img 2.6.32.10

Yes I was in my plans to compare the debian pvops kernel against a pvops compiled kernel from Jeremy's git repo.

Additionally I hoped to acquire a 2.6.33 Xenified kernel .config to compile a forward ported 2.6.33 Xenlinux kernel for testing with.

My current 2.6.33 .config is attached. I was hoping to have acquired a more generic config rather than just targeting primarily for my system. I do not mind if it will take longer to build the kernel :-)

Thanks.


-M

--- On Fri, 4/2/10, Mike Viau <viaum@xxxxxxxxxxxxxxx> wrote:

>>Hi,
>>
>>I noticed that the Xenlinux 2.6.33 patches are tagged as being "Deprecated" but the 2.6.31 are not.
>>
>>May I ask why?
>>
>>http://code.google.com/p/gentoo-xen-kernel/downloads/list?can=1&q=&colspec=Filename+Summary+Uploaded+Size+DownloadCount
>>
>>
> Fri, 2 Apr 2010 13:15:09 -0400 <konrad.wilk@xxxxxxxxxx> wrote:
>
> No idea. But those patches are pursuing an entirely different method of
> getting Linux to work in privileged state (Dom0). The current
> development is with the pv-ops one:
>
> http://wiki.xensource.com/xenwiki/XenParavirtOps
>

I am currently using the unstable version of debain's pvops xen kernel.

http://packages.debian.org/sid/linux-image-2.6.32-4-xen-amd64

It appears to have functioning networking and block devices which is nice, but I have experienced some instabilities such as kernel dumping on reboots. Unfortunately I do not have a console setup to log kernel messages for this machine.

Would compiling the pv_ops kernel from the git repository produce any additional stability?

It was my understanding that one could run a stable Xen systems today with a Xenlinux kernel, as pv_ops was still in development. I've read on the XenParavirtsOps page that there are features available to Xen but are not yet available in the pv_ops kernel (perhaps this wiki has not been updated as I understand Xen 4.0 release is just around the corner!):

 

• Work in progress:
  • dom0 support, currently planned for Linux 2.6.35 (latest pv_ops dom0 patches can be found from jeremy's git tree, see instructions below)
  • pv-on-hvm driver support
  • Balloon expansion (using memory hotplug) to grow bigger than initial domU memory size
• To be done:
  • Device hotplug
  • Other device drivers
  • kdump/kexec
  • pvscsi backend (dom0)
  • pvusb backend (dom0)
  • ...?

>>Also is there somewhere one could view list xen features added into linux kernel source (e.g: netchannel2, blktap, etc) ?
>>

Does anyone have a graph or something showing the state of these Xen features/modules in the two predominate Dom 0 capable kernels (Xenlinux & PV_OPS) to share or post to a wiki?

root@localhost:~# tree /lib/modules/2.6.32-4-xen-amd64/kernel/drivers/xen
/lib/modules/2.6.32-4-xen-amd64/kernel/drivers/xen
|-- blktap
|   `-- blktap.ko
|-- xen-evtchn.ko
`-- xenfs
    `-- xenfs.ko

2 directories, 3 files

Other XEN features are compiled as (=y) in the unstable version of debain's pvops xen kernel .config file.

>>
>>Lastly could someone provide perhaps a few xenlinux kernel .configs that works. I have attached my working config used with 2.6.33 source, but I am hoping to get a copy of a more generic + working .config
>>

Recently pv_ops kernel configs for both the 2.6.31 and 2.6.32 kernels have been in circulation. Can anyone share some .configs that were used on Xenlinux kernels (not 2.6.18) when they were in their prime?


Thanks!


-M
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