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

From: Nikunj A Dadhania
Subject: Re: [Qemu-devel] [Qemu-ppc] [PATCH RFC v1 0/3] Enable MTTCG on PPC64
Date: Fri, 07 Apr 2017 10:54:13 +0530
User-agent: Notmuch/0.23.5 (https://notmuchmail.org) Emacs/25.1.1 (x86_64-redhat-linux-gnu)

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.


>> 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)

> and the PowerNV machine ?

Haven't tried it, should work. Just give a shot, let me know if you see 


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