Re: [PATCH for-5.1 V3 0/7] mips: Add Loongson-3 machine support (with KVM)

[Aleksandar Markovic]

нед, 3. мај 2020. у 12:21 Huacai Chen <address@hidden> је написао/ла:
>
> 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.
>

Hi, Huacei,

Just a couple of practicalities. As you know, we can't upstream this
series until correspondent kernel support is upstreamed into kernel.
This is my advice, timing-wise:

- I think it is too late (and not good from testing/risk perspective)
to shoot for integrating your kernel series into kernel 5.7;
- My advice is to try to upstream your kernel series at the beginning
of 5.8 development cycle (which should not be too far)
- Once this is done, it will open the door for integrating this series
into QEMU upstream
- This means that combination of kernel 5.8 and QEMU 5.1 will
hopefully be a working system from Loongson KVM point of view
- This will also mean we will have relatively sufficient time to test,
and possibly fix some new bugs before QEMU 5.1 release.

I hope this tentative plan sounds good to you.

Sincerely,
Aleksandar