Bug#524542: Patches to fix bugs related to TSC clocksource on VMware

[Alok Kataria <akataria@vmware.com>]

> fyi, I took a shot at backporting these changes. Unfortunately our
> source is from before the 32/64 tsc.c merge, and a couple of these
> patches can't easily apply (even with the intrepid patches).
> Specifically, these are the changesets I had issues with:
> 
> commit 83db682
>     x86: Hypervisor detection and get tsc_freq from hypervisor
> commit 0532dac
>     x86: Skip verification by the watchdog for TSC clocksource
> 
> I'm not really comfortable applying the tsc-merge patches themselves
> since its not something I can easily spot check. Is it possible to
> recode these to apply to the pre-merge tsc files (and demonstrate a
> low risk of regression)? If so - and someone want to do that, it, then
> it would be an easier push for lenny.
> 

Oh I forgot to mention its is done for the pre-merge tsc files too, for
ubuntu 8.04. 

https://bugs.launchpad.net/ubuntu/+source/linux/+bug/319945

The corresponding commits from hardy tree are :

fd59eae709565d0c294f84bc2bf3c942a561c474
UBUNTU: x86: Hypervisor detection and get tsc_freq from hypervisor

2bdc8b310329b904a1c8b4505e47a5be15989dbc
UBUNTU: x86: Skip verification by the watchdog for TSC clocksource.

Also Ubuntu 8.04  required to patch the Xen kernel for some compile
issues.

commit acc45377a3a9938404bcc27586bd7ab4a2add062
UBUNTU: Xen: Fix FTBS after Vmware TSC updates.

Maybe you would require to add this one too for lenny.

Hope this helps.
Please let me know if you run into any issues. 

Thanks,
Alok