Re: [PATCH for-5.1 V4 0/7] mips: Add Loongson-3 machine support (with KVM)

[Aleksandar Markovic]

уто, 2. јун 2020. у 04:38 Huacai Chen <zltjiangshi@gmail.com> је написао/ла:
>
> Loongson-3 CPU family include Loongson-3A R1/R2/R3/R4 and Loongson-3B
> R1/R2.

Hi, Huacai,

The documents you kindly provided contain some valuable info on
Loongson-3A R1/R2/R3/R4 and Loongson-3B R1/R2. However, I
couldn't find detailed instruction-by-instruction specifications.

In fact, I don't need all the details right now, but some form of
overview of instructions sets of Loongson-3A R1/R2/R3/R4 and
Loongson-3B R1/R2. Could you please provide textual description
(one of two paragraph) of supported instructions for each of these
models:

* Loongson-3A R1
* Loongson-3A R2
* Loongson-3A R3
* Loongson-3A R4
* Loongson-3B R1
* Loongson-3B R2

(what is the base instructuin set; the difference to the previous model;
what SIMD extension (LMI/MSA) is supported other specifics around
supported instructions)

Based on your answer I may bring forward some suggestions on the
improvement of v4 of this series.

Truly yours,
Aleksandar

> 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.
>
> We are preparing to add QEMU's Loongson-3 support. MIPS VZ extension is
> fully supported in Loongson-3A R4+, so we at first add QEMU/KVM support
> in this series. And the next series will add QEMU/TCG support (it will
> emulate Loongson-3A R1).
>
> We already have a full functional Linux kernel (based on Linux-5.4.x LTS
> but not upstream yet) here:
>
> https://github.com/chenhuacai/linux
>
> 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;
> 4, Build QEMU-5.0.0 with this patchset;
> 5, modprobe kvm;
> 6, Use QEMU with TCG (available in future):
>        qemu-system-mips64el -M loongson3,accel=tcg -cpu Loongson-3A1000 
> -kernel <path_to_kernel> -append ...
>    Use QEMU with KVM (available at present):
>        qemu-system-mips64el -M loongson3,accel=kvm -cpu Loongson-3A4000 
> -kernel <path_to_kernel> -append ...
>
>    The "-cpu" parameter can be omitted 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>.
>
> Huacai Chen(4):
>  hw/mips: Implement the kvm_type() hook in MachineClass
>  target/mips: Add Loongson-3 CPU definition
>  hw/mips: Add Loongson-3 machine support (with KVM)
>  MAINTAINERS: Add myself as Loongson-3 maintainer
>
> Signed-off-by: Huacai Chen <chenhc@lemote.com>
> ---
>  MAINTAINERS                          |   5 +
>  default-configs/mips64el-softmmu.mak |   1 +
>  hw/core/Makefile.objs                |   2 +-
>  hw/core/null-machine.c               |   4 +
>  hw/mips/Kconfig                      |  10 +
>  hw/mips/Makefile.objs                |   3 +-
>  hw/mips/common.c                     |  42 ++
>  hw/mips/loongson3.c                  | 901 
> +++++++++++++++++++++++++++++++++++
>  include/hw/mips/mips.h               |   3 +
>  target/mips/cpu.h                    |  28 ++
>  target/mips/internal.h               |   2 +
>  target/mips/mips-defs.h              |   7 +-
>  target/mips/translate.c              |   2 +
>  target/mips/translate_init.inc.c     |  86 ++++
>  14 files changed, 1092 insertions(+), 4 deletions(-)
>  create mode 100644 hw/mips/common.c
>  create mode 100644 hw/mips/loongson3.c
> --
> 2.7.0