Re: [Xen-devel] Please apply "partially revert "xen: Remove event channel..."

[Andrew Cooper <andrew.cooper3@xxxxxxxxxx>]

On 10/04/17 19:48, Boris Ostrovsky wrote:
>>> The following is meant as a real question without any prejudice:
>>>
>>> How old a Xen version do we want to support in the Linux kernel?
>>>
>>> - Only those being still maintained (meaning getting security fixes)
> Definitely not this. 4.4 is the oldest version receiving official XSA
> patches and it's only 3 years old.
>
>>> - Versions max. X years after getting last security fixes (what value
>>>   of X?)
>>> - From version Y on (what value of Y?)
>>> - All versions which we can think of
>>>
>>> I think we should answer this question in order to know what we can
>>> remove in the Linux kernel without breaking something.
>> Ideally, "All versions which we can think of", unless it becomes too
>> difficult. In that case, I would switch to "From version Y" where Y is
>> not troublesome to support (and older than the oldest supported Xen
>> release).
> So Oracle, for example, officially supports its virtualization product
> for 8 to 10 years.
>
> Which means that 10 years after a product is released it is possible to
> see new version of Linux on  such a product (although realistically
> vendors may generally support more limited sets of guests).
>
> If we are to follow this line of reasoning Xen 3.4 needs to be supported
> --- it was released in 2009.

Citrix XenServer is also 10 years.

From what I understand, SUSE are still supporting Xen 3.2 based
products, which is the same kind of vintage.

~Andrew

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