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Re: [Qemu-devel] [Question]Support of China loogson processor
From: |
Leon Alrae |
Subject: |
Re: [Qemu-devel] [Question]Support of China loogson processor |
Date: |
Thu, 16 Apr 2015 12:07:43 +0100 |
User-agent: |
Mozilla/5.0 (Windows NT 6.1; WOW64; rv:24.0) Gecko/20100101 Thunderbird/24.5.0 |
On 15/04/2015 10:35, James Hogan wrote:
> On 13/04/15 12:29, vt 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.
>> 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.
>>
>> If anyone have done that before, let me know it will not be a dead end.
>>
>> Thanks
>> Sangfor VT
>
> I haven't attempted it on Loongson yet, but it'd be interesting to see
> whether it works. You'd still have to emulate a Malta guest at the
> moment. Getting it to work on the Ingenic XBurst cores required a little
> effort in the kernel due to slight incompatibilities with the MIPS32r2
> spec, so its possible there'll be problems with Loongson too.
>
> I presume Loongson may use highmem, if so you'll want to disable it. I
> still need to get those patches sorted out.
>
> Let us know how it goes or if you hit problems!
Since I also haven't had a chance to test Loongson emulation, I thought
I'd give it a try (TCG only, Loongson-2E cpu and fulong2e machine).
Good news is that I'm able to get to the login prompt using ancient QEMU
v1.0, kernel 2.6.33 (with additional patch from
https://lists.gnu.org/archive/html/qemu-devel/2010-06/msg02566.html) and
some old debian image I had handy. However, in any newer version
starting from v1.1.0 of QEMU something goes horribly wrong and it just
segfaults somewhere inside hw/bonito.c quite early during kernel
booting. I haven't looked deeper, but it seems it's not in the best shape...
Leon
- [Qemu-devel] [Question]Support of China loogson processor, vt, 2015/04/13
- Re: [Qemu-devel] [Question]Support of China loogson processor, Rob Landley, 2015/04/14
- Re: [Qemu-devel] [Question]Support of China loogson processor, James Hogan, 2015/04/15
- Re: [Qemu-devel] [Question]Support of China loogson processor,
Leon Alrae <=
- Re: [Qemu-devel] [Question]Support of China loogson processor, Paolo Bonzini, 2015/04/16
- Re: [Qemu-devel] [Question]Support of China loogson processor, Leon Alrae, 2015/04/16
- Re: [Qemu-devel] [Question]Support of China loogson processor, Paolo Bonzini, 2015/04/16
- Re: [Qemu-devel] [Question]Support of China loogson processor, Leon Alrae, 2015/04/16
- Re: [Qemu-devel] [Question]Support of China loogson processor, Paolo Bonzini, 2015/04/16
- Re: [Qemu-devel] [Question]Support of China loogson processor, Peter Maydell, 2015/04/16