Re: [PATCH V19 4/5] hw/mips: Add Loongson-3 machine support

[Philippe Mathieu-Daudé]

On 12/21/20 12:05 PM, Huacai Chen wrote:
> Add Loongson-3 based machine support, it use liointc as the interrupt
> controler and use GPEX as the pci controller. Currently it can work with
> both TCG and KVM.
> 
> As the machine model is not based on any exiting physical hardware, the
> name of the machine is "loongson3-virt". It may be superseded in future
> by a real machine model. If this happens, then a regular deprecation
> procedure shall occur for "loongson3-virt" machine.
> 
> We now already have a full functional Linux kernel (based on Linux-5.4.x
> LTS) here:
> 
> https://github.com/chenhuacai/linux
> 
> Of course the upstream kernel is also usable (the kvm host side and
> guest side have both been upstream in Linux-5.9):
> 
> 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_defconfig;
> 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.
> 
> Signed-off-by: Huacai Chen <chenhuacai@kernel.org>
> Co-developed-by: Jiaxun Yang <jiaxun.yang@flygoat.com>
> Signed-off-by: Jiaxun Yang <jiaxun.yang@flygoat.com>
> ---
>  MAINTAINERS                                  |   1 +
>  default-configs/devices/mips64el-softmmu.mak |   1 +
>  hw/mips/Kconfig                              |  11 +
>  hw/mips/loongson3_virt.c                     | 621 +++++++++++++++++++
>  hw/mips/meson.build                          |   2 +-
>  5 files changed, 635 insertions(+), 1 deletion(-)
>  create mode 100644 hw/mips/loongson3_virt.c

Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>