Re: [PATCH] riscv: Add initial Xen guest support for RISC-V

[Oleksii Kurochko <oleksii.kurochko@gmail.com>]

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Hi Stefano,

On 1/15/25 1:01 AM, Stefano Stabellini wrote:
> +Oleksii
>
> On Tue, 14 Jan 2025, Milan Djokic wrote:
>> From: Slavisa Petrovic<Slavisa.Petrovic@rt-rk.com>
>>
>> This patch introduces initial support for running RISC-V as a Xen guest.
>> It provides the necessary infrastructure and stubs for Xen-specific
>> operations. Key changes include:
>>
>> - Modifications to the RISC-V kernel to integrate Xen-specific hypercalls
>>    and interfaces, with function implementations stubbed for future work.
>> - Introduction of Xen-specific headers for RISC-V, including event
>>    handling, hypervisor interaction, and page management. Functions are
>>    defined but not yet implemented.
>> - Stub implementations for memory management, grant tables, and context
>>    switching in the Xen environment, allowing further development and
>>    integration.
>>
>> Signed-off-by: Milan Djokic<Milan.Djokic@rt-rk.com>
>> Signed-off-by: Slavisa Petrovic<Slavisa.Petrovic@rt-rk.com>
> Hi Milan, Slavisa,
>
> Thank you very much for your contribution! Which Xen tree are you using
> for development?

They are using [1] and have separate branches on top of latest. So we are in
sync. Also, if you are interested we have created a task/epics for this feature in
[1] so you could also check there some details:
1.https://gitlab.com/groups/xen-project/people/olkur/-/epics/5
2.https://gitlab.com/xen-project/people/olkur/xen/-/issues/12

>   I am asking because RISC-V support in Xen is still in
> the process of being upstreamed, and [1] is the tree that consolidates
> all patches currently on the to-be-upstreamed list.
>
> While the specific Xen tree you are using is not particularly important
> at this stage, and using [1] is not a requirement, I am asking because
> it is essential to align on the hypervisor ABI, especially regarding any
> details that have not yet been upstreamed. Specifically, is there
> anything in this patch series that relies on features not yet upstream
> in Xen?

There are few features but some things which are Rt-Tk's branch in [1] could go
without waiting for these features to be upstreamed.

Thanks.

~ Oleksii

>
> [1]https://gitlab.com/xen-project/people/olkur/xen/-/tree/latest?ref_type=heads

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