Re: [PATCH v2 0/5] Minimal build for RISCV

[Connor Davis <connojdavis@gmail.com>]

On 5/13/21 10:43 PM, Alistair Francis wrote:
> On Fri, May 14, 2021 at 2:18 PM Connor Davis <connojdavis@gmail.com> wrote:
>> Hi all,
>>
>> This series introduces a minimal build for RISCV. It is based on Bobby's
>> previous work from last year[0]. I have worked to rebase onto current Xen,
>> as well as update the various header files borrowed from Linux.
>>
>> This series provides the patches necessary to get a minimal build
>> working. The build is "minimal" in the sense that 1) it uses a
>> minimal config and 2) files, functions, and variables are included if
>> and only if they are required for a successful build based on the
>> config. It doesn't run at all, as the functions just have stub
>> implementations.
>>
>> My hope is that this can serve as a useful example for future ports as
>> well as inform the community of exactly what is imposed by common code
>> onto new architectures.
>>
>> The first 3 patches are mods to non-RISCV bits that enable building a
>> config with:
>>
>>    !CONFIG_HAS_NS16550
>>    !CONFIG_HAS_PASSTHROUGH
>>    !CONFIG_GRANT_TABLE
>>
>> respectively. The fourth patch adds the RISCV files, and the last patch
>> adds a docker container for doing the build. To build from the docker
>> container (after creating it locally), you can run the following:
>>
>>    $ make XEN_TARGET_ARCH=riscv64 SUBSYSTEMS=xen
>>
>> The sources taken from Linux are documented in arch/riscv/README.sources.
>> There were also some files copied from arm:
>>
>>    asm-arm/softirq.h
>>    asm-arm/random.h
>>    asm-arm/nospec.h
>>    asm-arm/numa.h
>>    asm-arm/p2m.h
>>    asm-arm/delay.h
>>    asm-arm/debugger.h
>>    asm-arm/desc.h
>>    asm-arm/guest_access.h
>>    asm-arm/hardirq.h
>>    lib/find_next_bit.c
>>
>> I imagine some of these will want some consolidation, but I put them
>> under the respective RISCV directories for now.
> Awesome!
>
> Do you have a public branch I could pull these from to try out?
>
> Alistair
Yes you can find the latest here: 
https://gitlab.com/connojd/xen/-/commits/riscv-build


Thanks,

Connor