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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: Fri, 7 Apr 2017 08:07:57 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.8.0

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.



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