Re: [RFC PATCH 5/9] docs/x86: Introduce FastABI

["Teddy Astie" <teddy.astie@xxxxxxxxxx>]

Le 28/08/2025 à 14:35, Jan Beulich a écrit :
> On 21.08.2025 17:25, Teddy Astie wrote:
>> FastABI is a alternative ABI designed with performance and coco-enabled
>> guest in mind. It is register-oriented instead of refering to C structures
>> in the guest memory (through a virtual memory pointer).
>>
>> It only focuses on kernel-side hypercalls, it doesn't aim to provide 
>> toolstack
>> operations.
>
> And even there it excludes certain pretty relevant ones, like many of the
> gnttabop sub-ops. As alluded to by a reply to an earlier patch, I don't
> think having an ABI for just a subset of the hypercalls is going to help.
>

Many hypercalls are missing in current RFC, including the grant
map/unmap ones. But a part of the idea is to still having some
hypercalls out of scope (mainly legacy and toolstack-specific ones) to
reduce the complexity.

> Jan
>



Teddy Astie | Vates XCP-ng Developer

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