From: WANG Xuerui <i.qemu@xen0n.name>
To: Song Gao <gaosong@loongson.cn>,
Richard Henderson <richard.henderson@linaro.org>,
qemu-devel@nongnu.org
Cc: peter.maydell@linaro.org, thuth@redhat.com,
chenhuacai@loongson.cn, alex.bennee@linaro.org,
yangxiaojuan@loongson.cn, peterx@redhat.com, laurent@vivier.eu,
alistair.francis@wdc.com, maobibo@loongson.cn,
pbonzini@redhat.com, bmeng.cn@gmail.com, philmd@redhat.com,
f4bug@amsat.org
Subject: Re: [PATCH v6 00/21] Add LoongArch linux-user emulation support
Date: Wed, 22 Sep 2021 17:49:56 +0800 [thread overview]
Message-ID: <4873b569-fb74-177d-8888-2964c636d14e@xen0n.name> (raw)
In-Reply-To: <77e2f5b9-ff55-aad4-77dc-13a5547717b1@loongson.cn>
Hi Song,
On 9/22/21 14:22, Song Gao wrote:
> Hi, Richard.
>
> On 09/21/2021 05:17 AM, Richard Henderson wrote:
>> On 9/17/21 1:12 AM, Song Gao wrote:
>>> The 'o32' code has been deleted at the latest kernel [1]. This series only support
>>> linux-user emulation.
>> I have now reviewed all but the linux-user/ portion.
>>
> Thank you!
>> I see that kernel upstreaming is in progress,
>>
>> https://lore.kernel.org/linux-kernel/20210917035736.3934017-1-chenhuacai@loongson.cn/
>>
>> so hopefully this will be resolved soon.
>>
>> Have you started working on system mode support for LoongArch, so that one may run that kernel?
>> Yes. We already support running the old kernel, but we don't support running the latest kernel yet.
(the reply was at the wrong quotation level, never mind though)
First of all, thanks for your contribution and continued engagement with
the wider development community! That's what it takes to unlock the
3A5000 and future products' so many possibilities.
As for the system emulation part, I have some questions though:
- How would you provide the necessary firmware bits? Ideally that would
be some open-source reference implementation so people would be able to
collaborate on that front, and to maybe customize for specialized needs
(e.g. ultra-dense cloud use cases like with Firecracker).
- How is old/new kernel ABI affecting your system-level emulation
compatibility? IIUC the underlying ISA and chip behavior should be the
same, only difference would be the firmware-kernel ABI, but again it
should be just a matter of substituting the right image.
- Would the resulting work support emulating both old-world and
new-world systems? AFAIK those commercial distros who're VERY early
adopters of LoongArch are given similarly early toolchains/kernels. They
belong to the old-world as a result, and are very likely to be stuck on
the old-world ABI for whole major versions before migrating, if at all
possible. Closed-source/commercial software also risk being available
only for the old-world, and it would be extremely important to provide
some degree of interoperability so that we don't split the ecosystem.
Questions aside, you did a nice work so far; looking forward to your
system emulation work!
next prev parent reply other threads:[~2021-09-22 9:52 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-09-17 8:12 [PATCH v6 00/21] Add LoongArch linux-user emulation support Song Gao
2021-09-17 8:12 ` [PATCH v6 01/21] target/loongarch: Add README Song Gao
2021-09-20 18:51 ` Richard Henderson
2021-09-17 8:12 ` [PATCH v6 02/21] target/loongarch: Add core definition Song Gao
2021-09-20 18:55 ` Richard Henderson
2021-09-17 8:12 ` [PATCH v6 03/21] target/loongarch: Add main translation routines Song Gao
2021-09-17 8:12 ` [PATCH v6 04/21] target/loongarch: Add fixed point arithmetic instruction translation Song Gao
2021-09-17 8:12 ` [PATCH v6 05/21] target/loongarch: Add fixed point shift " Song Gao
2021-09-17 8:12 ` [PATCH v6 06/21] target/loongarch: Add fixed point bit " Song Gao
2021-09-17 8:12 ` [PATCH v6 07/21] target/loongarch: Add fixed point load/store " Song Gao
2021-09-17 8:12 ` [PATCH v6 08/21] target/loongarch: Add fixed point atomic " Song Gao
2021-09-17 8:12 ` [PATCH v6 09/21] target/loongarch: Add fixed point extra " Song Gao
2021-09-17 8:12 ` [PATCH v6 10/21] target/loongarch: Add floating point arithmetic " Song Gao
2021-09-20 18:56 ` Richard Henderson
2021-09-17 8:12 ` [PATCH v6 11/21] target/loongarch: Add floating point comparison " Song Gao
2021-09-17 8:12 ` [PATCH v6 12/21] target/loongarch: Add floating point conversion " Song Gao
2021-09-17 8:12 ` [PATCH v6 13/21] target/loongarch: Add floating point move " Song Gao
2021-09-17 8:12 ` [PATCH v6 14/21] target/loongarch: Add floating point load/store " Song Gao
2021-09-17 8:12 ` [PATCH v6 15/21] target/loongarch: Add branch " Song Gao
2021-09-17 8:12 ` [PATCH v6 16/21] target/loongarch: Add disassembler Song Gao
2021-09-17 8:12 ` [PATCH v6 17/21] LoongArch Linux User Emulation Song Gao
2021-09-23 6:53 ` Laurent Vivier
2021-09-23 8:42 ` Song Gao
2021-09-17 8:12 ` [PATCH v6 18/21] default-configs: Add loongarch linux-user support Song Gao
2021-09-17 8:12 ` [PATCH v6 19/21] target/loongarch: Add target build suport Song Gao
2021-09-17 8:12 ` [PATCH v6 20/21] target/loongarch: 'make check-tcg' support Song Gao
2021-09-17 8:13 ` [PATCH v6 21/21] scripts: add loongarch64 binfmt config Song Gao
2021-09-20 21:17 ` [PATCH v6 00/21] Add LoongArch linux-user emulation support Richard Henderson
2021-09-22 6:22 ` Song Gao
2021-09-22 9:49 ` WANG Xuerui [this message]
2021-09-23 3:09 ` gaosong
2021-09-23 4:26 ` WANG Xuerui
2021-09-23 8:54 ` Song Gao
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