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Re: [Qemu-devel] [Qemu-ppc] [PATCH RFC v1 0/3] Enable MTTCG on PPC64

From: Cédric Le Goater
Subject: Re: [Qemu-devel] [Qemu-ppc] [PATCH RFC v1 0/3] Enable MTTCG on PPC64
Date: Mon, 10 Apr 2017 18:41:03 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.8.0

On 04/07/2017 08:07 AM, Cédric Le Goater wrote:
> On 04/07/2017 07:24 AM, Nikunj A Dadhania wrote:
>> Cédric Le Goater <address@hidden> writes:
>>> Hello Nikunj,
>>> On 04/06/2017 12:22 PM, Nikunj A Dadhania wrote:
>>>> The series enables Multi-Threaded TCG on PPC64
>>>> Patch 01: Use atomic_cmpxchg in store conditional
>>>>       02: Handle first write to page during atomic operation
>>>>       03: Generate memory barriers for sync/isync and load/store 
>>>> conditional
>>>> Patches are based on ppc-for-2.10
>>>> Tested using following:
>>>> ./ppc64-softmmu/qemu-system-ppc64 -cpu POWER8 -vga none -nographic 
>>>> -machine pseries,usb=off -m 2G  -smp 8,cores=8,threads=1 -accel 
>>>> tcg,thread=multi  f23.img
>>> I tried it with a Ubuntu 16.04.2 guest using stress --cpu 8. It looked 
>>> good : the CPU usage of QEMU reached 760% on the host.
>> Cool.
>>>> Todo:
>>>> * Enable other machine types and PPC32.
>>> I am quite ignorant on the topic.
>>> Have you looked at what it would take to emulate support of the HW
>>> threads ?
>> We would need to implement msgsndp (doorbell support for IPI between
>> threads of same core)
> ok. I get it. Thanks,
>>> and the PowerNV machine ?
>> Haven't tried it, should work. Just give a shot, let me know if you see 
>> problems.
> sure. pnv is still on 2.9, so I will rebase on 2.10, merge your 
> patches  and tell you.

The system seems to be spinning in skiboot in cpu_idle/relax when 
starting the linux kernel. It finally boots, but it is rather long.
David has merged enough to test if you want to give it a try.



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