Re: [Xen-devel] [PATCH RFC] Add SUPPORT.md\

[George Dunlap <george.dunlap@xxxxxxxxxx>]

On 09/07/2017 03:56 PM, Wei Liu wrote:
> On Thu, Sep 07, 2017 at 02:52:49PM +0100, George Dunlap wrote:
>> On 09/01/2017 04:00 PM, Wei Liu wrote:
>>> On Thu, Aug 31, 2017 at 11:27:19AM +0100, George Dunlap wrote:
>>>> +### Direct-boot kernel image format
>>>> +
>>>> +    Supported, x86: bzImage
>>>
>>> Do you mean booting a PV guest? If so there are a few more formats.
>>>
>>>> +    Supported, ARM32: zImage
>>>> +    Supported, ARM64: Image [XXX - Not sure if this is correct]
>>>> +
>>>> +Format which the toolstack accept for direct-boot kernels
>>> [...]
>>>> +### JSON support for xl
>>>> +
>>>> +    Status: Preview
>>>> +
>>>
>>> What is this?
>>
>> JSON output; e.g., `xl list -l`.
>>
>> Perhaps this should be called 'JSON output support'. :-)
>>
> 
> OK. Anyway, no security support for this please. I'm not even very sure
> if the output is going to be stable.

"Tech Preview" means no security support.  But given how incomplete it
is, maybe "Experimental" would be a better designation.

> 
>>>> +### AHCI support for xl
>>>> +
>>>> +    Status, x86: Supported
>>>> +
>>>
>>> There is only one knob to change, I'm not sure whether makes sense to
>>> list it separately.
>>>
>>>> +### Soft-reset for xl
>>>> +
>>>> +    Status: Supported
>>>> +
>>>
>>> We never tested this in osstest so I'm not sure about if this is the
>>> correct status. Furthermore there is also moving parts in hypervisor.
>>
>> Hmm, maybe this would go better under a hypervisor section somewhere; as
>> you say, the core functionality doesn't reside in xl, xl just enables it.
>>
> 
> A bit more than that, there are moving parts in libxl to handle that as
> well -- some initialisation needs to be skipped or whatever, some can't.

A large proportion of features require support both in the hypervisor
and in the toolstack.  It doesn't make sense to talk about them
separately; it makes sense to put them where the "core" of their
implementation resides.

 -George

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