Re: RFC: making the PVH 64bit ABI as stable

[Andrew Cooper <andrew.cooper3@citrix.com>]

On 02/06/15 16:11, Roger Pau Monné 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. 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.

This would be exceedingly short sighted until 32bit and AMD support are
present.

Therefore, -1 from me, especially as I am not convinced that 32bit will
get in without ABI changes.

~Andrew


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