Re: [PATCH v6 2/4] target/riscv: Add server platform reference cpu

[Daniel Henrique Barboza <daniel.barboza@oss.qualcomm.com>]

On 5/15/2026 3:15 PM, Nicholas Piggin wrote:
> On Thu, May 14, 2026 at 05:46:38PM -0300, Daniel Henrique Barboza wrote:
>> From: Fei Wu <wu.fei9@sanechips.com.cn>
>>
>> The harts requirements of RISC-V server platform [1] require RVA23 ISA
>> profile support and others.
>>
>> This patch provides a new "riscv-server-ref" CPU to go along with the
>> future "riscv-server-ref" board.
> 
> About compatibility, if we get a server platform spec v2.0 that requires
> a different machine and RVA28 + Sxxx CPU. Is the plan to update these,
> or add a new CPU and machine types? If the latter, then perhaps a
> version in the names like riscv-server-v1.0 / riscv-server-v1.0-cpu
> would be good.

Good question.  We can get away with machine props to change the board
behavior based on spec version but not sure if this makes sense with
a CPU.  I suppose we could live with:

-cpu riscv-server-ref,spec1.1=on

to change the CPU setup to v1.1 and so on, but creating a new CPU with the
spec version in the name like you suggested (e.g. riscv-server-ref-v1.1)
seems cleaner.  In particular if the spec doesn't change that much - which
I guess it's fair to assume given that a reference spec wouldn't be much
of a reference if it keeps changing/updating all the time ...


Thanks,
Daniel

> 
> Non-versioned names could be aliases to the latest one, but I don't know
> if that is really worthwhile particularly for non virtualized system.
> 
> Thanks,
> Nick