Re: [Xen-devel] [PATCH 03/16] SUPPORT.md: Add some x86 features

[George Dunlap <george.dunlap@xxxxxxxxxx>]

On 11/21/2017 08:09 AM, Jan Beulich wrote:
>>>> On 13.11.17 at 16:41, <george.dunlap@xxxxxxxxxx> wrote:
>> +### x86/PVH guest
>> +
>> +    Status: Supported
>> +
>> +PVH is a next-generation paravirtualized mode 
>> +designed to take advantage of hardware virtualization support when possible.
>> +During development this was sometimes called HVMLite or PVHv2.
>> +
>> +Requires hardware virtualisation support (Intel VMX / AMD SVM)
> 
> I think it needs to be said that only DomU is considered supported.
> Dom0 is perhaps not even experimental at this point, considering
> the panic() in dom0_construct_pvh().

Indeed, that's why dom0 PVH isn't in the list, and why this says 'PVH
guest', and is in the 'Guest Type' section.  We generally don't say,
"Oh, and we don't have this feature at all".

If you think it's important we could add a sentence here explicitly
stating that dom0 PVH isn't supported, but I sort of feel like it isn't
necessary.

>> +### Host ACPI (via Domain 0)
>> +
>> +    Status, x86 PV: Supported
>> +    Status, x86 PVH: Tech preview
>
> Are we this far already? Preview implies functional completeness,
> but I'm not sure about all ACPI related parts actually having been
> implemented (and see also below). But perhaps things like P and C
> state handling come as individual features later on.

Hmm, yeah, it doesn't make much sense to say that we have "Tech preview"
status for a feature with a PVH dom0, when PVH dom0 itself isn't even
'experimental' yet.  I'll remove this (unless Roger or Wei want to object).

 -George


_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxx
https://lists.xen.org/xen-devel