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

[Aleksandar Markovic]

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.

Thanks,

Aleksandar

 

> 2.7.0