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Re: [Xen-devel] Radical proposal: ship not-fully-tidied shim as 4.10.1

On 1/8/18 11:45 AM, Ian Jackson wrote:
> But this is not a usual situation.  This time, we don't have the time
> to wait.
> Opinions ?

I'm going to follow up with a top post with my feelings and from info on
various parts of the thread.

We have 2 versions of PV shim, the Citrix version and the Amazon
version. The proposal here is to go with the Citrix version. I'll
compare the two how I see them.

Citrix Version
- based on PVH which means 4.10 only
  - supported on 4.8 and 4.9 if we backport changes to the toolstack
- no solution for 4.7 and prior versions
- no backports currently available
- supports *most* Xen PV features
  - no support for PCI pass through
- confirmed to not work on HVM [1] [2]

Amazon Version
- based on HVM
- tested and deployed across Amazon's large fleet
- works from Xen 3.4 and up
- backported to 4.9 and 4.10 [3]
- supports *most* Xen PV features
  - ballooning is broken but Anthony has committed to providing a v3
with this support. [4]
  - migration is currently untested

If the primary driver for getting these patches in is for end users and
consumers of Xen, a large portion of them who have not yet deployed Xen
4.10 then why are we moving forard with an approach that requires them
to potentially upgrade or change a lot more of their environment. This
seems down right hostile to their concerns and needs.

Doug Goldstein

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