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

[George Dunlap <george.dunlap@xxxxxxxxxx>]

On 01/09/2018 06:13 PM, Doug Goldstein wrote:
> 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

We are committed to having HVM support along with PVH support (if we go
this route).

We can change this to:
 - For 4.10, and 4.8 / 4.9 with backports, users will be able to boot PV
guests without a sidecar or qemu, and (hopefully) transparently to the
toolstack
 - For 4.7 and prior, or 4.8+ without backports, available with sidecar
boot disk (and added qemu instance)

> - 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

 - But requires "sidecar boot disk", and will add a qemu instance per guest

> - 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

 -George

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