linux-kernel - Re: [RFC PATCH V3 00/11] riscv: Add vector ISA support

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Date:   Mon, 9 Mar 2020 18:27:08 +0800
From:   LIU Zhiwei <zhiwei_liu@...ky.com>
To:     Greentime Hu <greentime.hu@...ive.com>, guoren@...nel.org
Cc:     Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>, Anup.Patel@....com,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-arch@...r.kernel.org, arnd@...db.de,
        linux-csky@...r.kernel.org,
        linux-riscv <linux-riscv@...ts.infradead.org>,
        Guo Ren <guoren@...ux.alibaba.com>,
        Dave Martin <Dave.Martin@....com>
Subject: Re: [RFC PATCH V3 00/11] riscv: Add vector ISA support



On 2020/3/9 11:41, Greentime Hu wrote:
> On Sun, Mar 8, 2020 at 5:50 PM <guoren@...nel.org> wrote:
>> From: Guo Ren <guoren@...ux.alibaba.com>
>>
>> The implementation follow the RISC-V "V" Vector Extension draft v0.8 with
>> 128bit-vlen and it's based on linux-5.6-rc3 and tested with qemu [1].
>>
>> The patch implement basic context switch, sigcontext save/restore and
>> ptrace interface with a new regset NT_RISCV_VECTOR. Only fixed 128bit-vlen
>> is implemented. We need to discuss about vlen-size for libc sigcontext and
>> ptrace (the maximum size of vlen is unlimited in spec).
>>
>> Puzzle:
>> Dave Martin has talked "Growing CPU register state without breaking ABI" [2]
>> before, and riscv also met vlen size problem. Let's discuss the common issue
>> for all architectures and we need a better solution for unlimited vlen.
>>
>> Any help are welcomed :)
>>
>>   1: https://github.com/romanheros/qemu.git branch:vector-upstream-v3
> Hi Guo,
>
> Thanks for your patch.
> It seems the qemu repo doesn't have this branch?
Hi Greentime,

It's a promise from me. Now it's ready.  You can turn on vector by 
"qemu-system-riscv64 -cpu rv64,v=true,vext_spec=v0.7.1".

Zhiwei