[Lucid SRU] Prepare virtual to replace ec2

[Andy Whitcroft]

On Wed, May 08, 2013 at 06:21:46PM +0200, Stefan Bader wrote:

> Mostly "less surprise". It is hard to put it into specific benefits. To some
> degree the master kernel uses more up to date interfaces. I recall a request
> long ago about refreshing the interrupt handling. This was never completely done
> because the ec2 codebase is so much different. You may remember that I tried to
> re-fresh the ec2 patchset which was an even more frightening result.
> This way the Lucid ec2 user would also get a tickless kernel and hv assisted
> spinlocks. And if there are issues we will have more luck in picking fixes from
> upstream. Not to mention that we should have less of a chance to miss a security
> related change either because it is in the copies of x86 files or because it is
> made in upstream xen drivers.

IIRC security were keen to see the split go as the security status of it
is much harder to be sure of.

-apw