Re: [PATCH V9 0/6] mips: Add Loongson-3 machine support

[chen huacai]

Hi, Aleksandar,

On Thu, Sep 17, 2020 at 4:22 PM Aleksandar Markovic
<aleksandar.qemu.devel@gmail.com> wrote:
>
>
>
> On Wednesday, September 16, 2020, Huacai Chen <zltjiangshi@gmail.com> wrote:
>>
>> Loongson-3 CPU family include Loongson-3A R1/R2/R3/R4 and Loongson-3B
>> R1/R2. Loongson-3A R1 is the oldest and its ISA is the smallest, while
>> Loongson-3A R4 is the newest and its ISA is almost the superset of all
>> others. To reduce complexity, in QEMU we just define two CPU types:
>>
>> 1, "Loongson-3A1000" CPU which is corresponding to Loongson-3A R1. It is
>>    suitable for TCG because Loongson-3A R1 has fewest ASE.
>> 2, "Loongson-3A4000" CPU which is corresponding to Loongson-3A R4. It is
>>    suitable for KVM because Loongson-3A R4 has the VZ ASE.
>>
>> Loongson-3 lacks English documents. I've tried to translated them with
>> translate.google.com, and the machine translated documents (together
>> with their original Chinese versions) are available here.
>>
>> Loongson-3A R1 (Loongson-3A1000)
>> User Manual Part 1:
>> http://ftp.godson.ac.cn/lemote/3A1000_p1.pdf
>> http://ftp.godson.ac.cn/lemote/Loongson3A1000_processor_user_manual_P1.pdf 
>> (Chinese Version)
>> User Manual Part 2:
>> http://ftp.godson.ac.cn/lemote/3A1000_p2.pdf
>> http://ftp.godson.ac.cn/lemote/Loongson3A1000_processor_user_manual_P2.pdf 
>> (Chinese Version)
>>
>> Loongson-3A R2 (Loongson-3A2000)
>> User Manual Part 1:
>> http://ftp.godson.ac.cn/lemote/3A2000_p1.pdf
>> http://ftp.godson.ac.cn/lemote/Loongson3A2000_user1.pdf (Chinese Version)
>> User Manual Part 2:
>> http://ftp.godson.ac.cn/lemote/3A2000_p2.pdf
>> http://ftp.godson.ac.cn/lemote/Loongson3A2000_user2.pdf (Chinese Version)
>>
>> Loongson-3A R3 (Loongson-3A3000)
>> User Manual Part 1:
>> http://ftp.godson.ac.cn/lemote/3A3000_p1.pdf
>> http://ftp.godson.ac.cn/lemote/Loongson3A3000_3B3000usermanual1.pdf (Chinese 
>> Version)
>> User Manual Part 2:
>> http://ftp.godson.ac.cn/lemote/3A3000_p2.pdf
>> http://ftp.godson.ac.cn/lemote/Loongson3A3000_3B3000usermanual2.pdf (Chinese 
>> Version)
>>
>> Loongson-3A R4 (Loongson-3A4000)
>> User Manual Part 1:
>> http://ftp.godson.ac.cn/lemote/3A4000_p1.pdf
>> http://ftp.godson.ac.cn/lemote/3A4000user.pdf (Chinese Version)
>> User Manual Part 2:
>> I'm sorry that it is unavailable now.
>>
>> And human-translated documents (W.I.P) are available here now:
>> https://github.com/loongson-community/docs/tree/master/English-translation-of-Loongson-manual
>>
>> Both KVM and TCG are available now!
>>
>> We now already have a full functional Linux kernel (based on Linux-5.4.x
>> LTS, the kvm host side and guest side have both been upstream for Linux-
>> 5.9, but Linux-5.9 has not been released yet) here:
>>
>> https://github.com/chenhuacai/linux
>>
>> Of course the upstream kernel is also usable (though it is "unstable"
>> now):
>>
>> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
>>
>> How to use QEMU/Loongson-3?
>> 1, Download kernel source from the above URL;
>> 2, Build a kernel with arch/mips/configs/loongson3_{def,hpc}config;
>> 3, Boot a Loongson-3A4000 host with this kernel (for KVM mode);
>> 4, Build QEMU-master with this patchset;
>> 5, modprobe kvm (only necessary for KVM mode);
>> 6, Use QEMU with TCG:
>>        qemu-system-mips64el -M loongson3-virt,accel=tcg -cpu Loongson-3A1000 
>> -kernel <path_to_kernel> -append ...
>>    Use QEMU with KVM:
>>        qemu-system-mips64el -M loongson3-virt,accel=kvm -cpu Loongson-3A4000 
>> -kernel <path_to_kernel> -append ...
>>
>>    The "-cpu" parameter is optional here and QEMU will use the correct type 
>> for TCG/KVM automatically.
>>
>> V1 -> V2:
>> 1, Add a cover letter;
>> 2, Improve CPU definitions;
>> 3, Remove LS7A-related things (Use GPEX instead);
>> 4, Add a description of how to run QEMU/Loongson-3.
>>
>> V2 -> V3:
>> 1, Fix all possible checkpatch.pl errors and warnings.
>>
>> V3 -> V4:
>> 1, Sync code with upstream;
>> 2, Remove merged patches;
>> 3, Fix build failure without CONFIG_KVM;
>> 4, Add Reviewed-by: Aleksandar Markovic <aleksandar.qemu.devel@gmail.com>.
>>
>> V4 -> V5:
>> 1, Improve coding style;
>> 2, Remove merged patches;
>> 3, Rename machine name from "loongson3" to "loongson3-virt";
>> 4, Rework the "loongson3-virt" machine to drop any ISA things;
>> 5, Rework "hw/mips: Implement the kvm_type() hook in MachineClass";
>> 6, Add Jiaxun Yang as a reviewer of Loongson-3.
>>
>> V5 -> V6:
>> 1, Fix license preamble;
>> 2, Improve commit messages;
>> 3, Add hw/intc/loongson_liointc.c to MAINTAINERS;
>> 4, Fix all possible checkpatch.pl errors and warnings.
>>
>> V7 and V8 have only one patch (machine definition) with some minor 
>> improvements.
>>
>> V8 -> V9:
>> 1, Update KVM type definition from kernel;
>> 2, Fix PageMask with variable page size for TCG;
>> 3, Add TCG support (add Loongson-EXT instructions).
>>
>> Huacai Chen and Jiaxun Yang (6):
>>  linux-headers: Update MIPS KVM type defintition
>>  target/mips: Fix PageMask with variable page size
>>  target/mips: Add loongson-ext lswc2 group of instructions (Part 1)
>>  target/mips: Add loongson-ext lswc2 group of instructions (Part 2)
>>  target/mips: Add loongson-ext lsdc2 group of instructions
>>  hw/mips: Add Loongson-3 machine support
>>
>> Signed-off-by: Huacai Chen <chenhc@lemote.com>
>> ---
>>  default-configs/mips64el-softmmu.mak |   1 +
>>  hw/mips/Kconfig                      |  11 +
>>  hw/mips/fw_cfg.c                     |  35 ++
>>  hw/mips/fw_cfg.h                     |  19 +
>>  hw/mips/loongson3_virt.c             | 956 
>> +++++++++++++++++++++++++++++++++++
>>  hw/mips/meson.build                  |   3 +-
>>  linux-headers/linux/kvm.h            |   5 +-
>>  target/mips/cp0_helper.c             |  36 +-
>>  target/mips/cpu.h                    |   1 +
>>  target/mips/translate.c              | 437 ++++++++++++++++
>>  10 files changed, 1494 insertions(+), 10 deletions(-)
>>  create mode 100644 hw/mips/fw_cfg.c
>>  create mode 100644 hw/mips/fw_cfg.h
>>  create mode 100644 hw/mips/loongson3_virt.c
>> --
>
>
> There should be a suitable note in QEMU documentation describing new 
> functionality.
OK, I will update documentations in V10.

Huacai
>
> Thanks,
> Aleksandar
>
>
>>
>> 2.7.0



-- 
Huacai Chen