Re: [Qemu-devel] [Question]Support of China loogson processor

[Rob Landley]

On Mon, Apr 13, 2015 at 6:29 AM, vt <address@hidden> wrote:
> Hi, guys
>
> I saw the architecture code about mips in the qemu and kvm modules, so it is
> no doubt that mips cpu can be supported.

It looks like the 32 bit one should work fine. I haven't played with
64 bit yet but there's some support for it in the tree, give it a try?

  http://en.wikipedia.org/wiki/Loongson

Heh. The background on the "4 patented instructions" mentioned above
is mips' lawsuit against Lexra many years ago:

  http://landley.net/notes-2009.html#14-12-2009

If you were wondering why mips had a lost decade where most of its
customers switched over to arm, convincing the world you're a patent
troll will do that. But it's been well over a decade and most people
seem to have forgotten now. And china never cared about US
intellectual property infighting anyway...

> But I wonder if anyone have used qemu/kvm virtualization with China loongson
> processor (MIPS architecture) without modification of qemu/kvm code.
> All the infomation I have searched in the Internet can't answer my question.

I have a mips r4k system emulation working fine at:

  http://landley.net/aboriginal/bin/system-image-mips.tar.gz

(That's based off of linux 3.18 I think, I have 3.19 building locally,
4.0 is on the todo list.)

I haven't tried 64 bit yet but:

$ qemu-system-mips64 -cpu ? | grep Loongson
MIPS 'Loongson-2E'
MIPS 'Loongson-2F'

It's apparently there...

Rob