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

[chen huacai]

Hi, Philippe,

On Thu, Sep 17, 2020 at 3:56 PM Philippe Mathieu-Daudé <f4bug@amsat.org> wrote:
>
> Hi Huacai,
>
> On 9/16/20 4:12 AM, Huacai Chen 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.
> >
> [...]
>
> > 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 ...
>
> Can you add a KVM-only build CI job?
> Simply building, not running test, as there is no MIPS CI.
>
> See for example commit 41e1f0e2256 (".travis.yml: Add a KVM-only
> s390x job"), but add it to GitLab instead.
I have some difficulties in CI testing (I think I should setup a CI
environment first), can this work be done by others, or in future
after this series?

Huacai
>
> Thanks!
>
> Phil.



-- 
Huacai Chen