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

From: Aleksandar Markovic
Subject: Re: [PATCH V9 0/6] mips: Add Loongson-3 machine support
Date: Thu, 17 Sep 2020 10:22:30 +0200

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/Loongson3A1000_processor_user_manual_P1.pdf (Chinese Version)
User Manual Part 2:
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/Loongson3A2000_user1.pdf (Chinese Version)
User Manual Part 2:
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/Loongson3A3000_3B3000usermanual1.pdf (Chinese Version)
User Manual Part 2:
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/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:

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:


Of course the upstream kernel is also usable (though it is "unstable"


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.



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