RE: [Xen-devel] 3.0.3 freeze

["Ian Pratt" <m+Ian.Pratt@xxxxxxxxxxxx>]

> But xen-unstable.hg is receiving major changes that we really 
> were not expecting for a tree that is in freeze state. For 
> example, the following changeset that went into xen-unstable 
> at the weekend will likely break compatabilty for libvirt in 
> quite a major way
> 
>   http://xenbits.xensource.com/xen-unstable.hg?cs=86d26e6ec89b
> 
>   "Replace dom0_ops hypercall with three new hypercalls:
>     1. platform_op -- used by dom0 kernel to perform actions on the
>        hardware platform (e.g., MTRR access, microcode 
> update, platform
>        quirks, ...)
>     2. domctl -- used by management tools to control a 
> specified domain
>     3. sysctl -- used by management tools for system-wide actions"

I didn't think we were going to get this patch in time for 3.0.3, but
when it arrived we decided it was low risk (it's mostly just a code
refactoring) and dropped it in. It then got stuck in the staging tree
for a couple of days behind some SMP HVM-related malaise.

The big advantage this patch gives us is that it should now be possible
to maintain the dom0 to hypervisor ABI in a backward compatible fashion
--- we've previously only ever guaranteed this for domU's. The
hypervisor and control stack will still need to be a matched set for the
time being, but using a any 3.0.3 compliant kernel as a dom0 should now
work on a 3.0.4 hypervisor etc.

Ian


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