Re: [Xen-devel] RFC: making the PVH 64bit ABI as stable

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 02.06.15 at 17:11, <roger.pau@xxxxxxxxxx> wrote:
> Hello,
> 
> The document describing the PVH interface was committed 9 months ago
> [1], and since then there hasn't been any change regarding the
> interface. PVH is still missing features in order to have feature parity
> with pure PV, mainly:
> 
>  - DomU miration support.
>  - PCI passthrough support.
>  - 32bit support.
>  - AMD support.
> 
> AFAICT however none of these features are going to change the current
> ABI.

This your guess; I don't think there's any guarantee. The more
that talk was about making PVH uniformly enter the kernel in 32-bit
mode.

> PCI passthrough might expand it, by adding new hypercalls, but I
> don't think this should prevent us from marking the current ABI as
> stable. ARM for example doesn't have PCI passthrough yet or migration
> support, but the ABI has been marked as stable.
> 
> To that end, I would like to request the 64bit PVH ABI to be marked as
> stable for DomUs. This is needed so external projects (like PVH support
> for grub2) can progress.

Understandable, but no, not before all the fixmes in the tree got
dealt with.

Jan


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