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Re: [Qemu-devel] [RFC v2 08/11] tcg: add options for enabling MTTCG

From: Alex Bennée
Subject: Re: [Qemu-devel] [RFC v2 08/11] tcg: add options for enabling MTTCG
Date: Tue, 12 Apr 2016 12:48:47 +0100
User-agent: mu4e 0.9.17; emacs

Sergey Fedorov <address@hidden> writes:

> On 05/04/16 18:32, Alex Bennée wrote:
>> diff --git a/qemu-options.hx b/qemu-options.hx
>> index a770086..4eca704 100644
>> --- a/qemu-options.hx
>> +++ b/qemu-options.hx
>> @@ -3224,6 +3224,20 @@ Attach to existing xen domain.
>>  xend will use this when starting QEMU (XEN only).
>> +DEF("tcg", HAS_ARG, QEMU_OPTION_tcg, \
>> +    "-tcg [mttcg=on|off] control TCG options\n", QEMU_ARCH_ALL)
>> address@hidden -tcg
>> address@hidden -tcg
>> address@hidden @option
>> address@hidden mttcg=[on|off]
>> +Control multi-threaded TCG. By default QEMU will enable multi-threaded
>> +emulation for front/back-end combinations that are known to work. The
>> +user may enable it against the defaults however odd guest behaviour
>> +may occur.
>> address@hidden table
> Maybe we'd better use existing qemu accelerator framework and introduce
> "-machine accel=mttcg" option?

My worry would be breaking existing code which assumes kvm | tcg. We
will want to enable mttcg by default for combos that work without having
to tweak tooling that already uses the -machine options.

Alex Bennée

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