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

[chen huacai]

Hi, Aleksandar,

On Sat, May 9, 2020 at 12:55 AM Aleksandar Markovic
<address@hidden> wrote:
>
> 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.
OK, I will try to upstream kernel series at first, and send a V4 of
qemu series after that.
>
> Sincerely,
> Aleksandar



-- 
Huacai Chen