From: Paolo Bonzini <pbonzini@redhat.com>
To: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Alexey Kardashevskiy <aik@ozlabs.ru>,
Alexander Graf <agraf@suse.de>,
"qemu-devel@nongnu.org" <qemu-devel@nongnu.org>,
"qemu-ppc@nongnu.org" <qemu-ppc@nongnu.org>,
Paul Mackerras <paulus@samba.org>,
David Gibson <david@gibson.dropbear.id.au>
Subject: Re: [Qemu-devel] [PATCH] powerpc iommu: enable multiple TCE requests
Date: Tue, 20 Aug 2013 11:15:55 +0200 [thread overview]
Message-ID: <521333CB.1080407@redhat.com> (raw)
In-Reply-To: <1376989997.25016.131.camel@pasglop>
Il 20/08/2013 11:13, Benjamin Herrenschmidt ha scritto:
> On Tue, 2013-08-20 at 11:09 +0200, Paolo Bonzini wrote:
>>> Sorry if I miss anything, but is not it what the patch already
>> does? :)
>>
>> No, you need to expose multitce unconditionally in the device tree.
>
> If I'm not mistaken the multitce kernel side patches are still not
> upstream so I disagree. Exposing it will make Linux use it which means
> that anything running on 3.10 or 3.11 will become very slow.
>
> So no, multitce should not be exposed if KVM doesn't support it.
Then you have to do it right and:
- provide the infrastructure to enable/disable it from the command line
(which will be enough design effort alone);
- add pseries-1.6 as a synonym of pseries in 1.6.1;
- add pseries-1.7 a synonym of pseries in master;
- add a pseries-1.6 machine type in master that always disables it.
Paolo
next prev parent reply other threads:[~2013-08-20 9:16 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-08-07 8:08 [Qemu-devel] [PATCH] powerpc iommu: enable multiple TCE requests Alexey Kardashevskiy
2013-08-16 9:49 ` Alexey Kardashevskiy
2013-08-18 15:22 ` Paolo Bonzini
2013-08-19 7:30 ` Alexey Kardashevskiy
2013-08-19 8:01 ` Alexander Graf
2013-08-19 8:44 ` Alexey Kardashevskiy
2013-08-19 9:47 ` Paolo Bonzini
2013-08-20 1:36 ` Alexey Kardashevskiy
2013-08-20 6:55 ` Alexander Graf
2013-08-20 8:39 ` Paolo Bonzini
2013-08-20 8:49 ` Alexey Kardashevskiy
2013-08-20 9:09 ` Paolo Bonzini
2013-08-20 9:13 ` Benjamin Herrenschmidt
2013-08-20 9:15 ` Paolo Bonzini [this message]
2013-08-20 9:20 ` Benjamin Herrenschmidt
2013-08-20 9:22 ` Paolo Bonzini
2013-08-20 9:26 ` Benjamin Herrenschmidt
2013-08-20 10:14 ` Paolo Bonzini
2013-08-20 11:38 ` Benjamin Herrenschmidt
2013-08-21 7:11 ` Alexander Graf
2013-08-21 7:29 ` [Qemu-devel] [Qemu-ppc] " Alexander Graf
2013-08-16 13:15 ` [Qemu-devel] " Alexander Graf
2013-08-19 9:01 ` Alexey Kardashevskiy
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