From: Avi Kivity <avi@redhat.com>
To: Peter Zijlstra <peterz@infradead.org>
Cc: Mark Langsdorf <mark.langsdorf@amd.com>,
Joerg Roedel <joerg.roedel@amd.com>,
kvm@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH][KVM][retry 3] Add support for Pause Filtering to AMD SVM
Date: Wed, 20 May 2009 12:04:48 +0300 [thread overview]
Message-ID: <4A13C7B0.10507@redhat.com> (raw)
In-Reply-To: <1242809657.26820.559.camel@twins>
Peter Zijlstra wrote:
>> It's a fully virtualized guest. There's no way to get this without
>> patching the guest kernel.
>>
>
> Yes there is.. virtualized monitor-wait stuff coupled with a
> monitor-wait based spinlock implementation.
>
That only works if the guest uses monitor/mwait. Not all of the guests
are under our control. I don't know whether Windows uses
monitor/mwait. Further, we don't have timed exits on mwait like we do
with pause.
I've also heard that monitor/mwait are very slow and only usable on idle
loop stuff.
> Once we go change silicon, you might as well do it right.
>
None of the major x86 vendors are under my control.
--
error compiling committee.c: too many arguments to function
WARNING: multiple messages have this Message-ID (diff)
From: Avi Kivity <avi@redhat.com>
To: Peter Zijlstra <peterz@infradead.org>
Cc: Mark Langsdorf <mark.langsdorf@amd.com>,
Joerg Roedel <joerg.roedel@amd.com>,
kvm@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH][retry 3] Add support for Pause Filtering to AMD SVM
Date: Wed, 20 May 2009 12:04:48 +0300 [thread overview]
Message-ID: <4A13C7B0.10507@redhat.com> (raw)
In-Reply-To: <1242809657.26820.559.camel@twins>
Peter Zijlstra wrote:
>> It's a fully virtualized guest. There's no way to get this without
>> patching the guest kernel.
>>
>
> Yes there is.. virtualized monitor-wait stuff coupled with a
> monitor-wait based spinlock implementation.
>
That only works if the guest uses monitor/mwait. Not all of the guests
are under our control. I don't know whether Windows uses
monitor/mwait. Further, we don't have timed exits on mwait like we do
with pause.
I've also heard that monitor/mwait are very slow and only usable on idle
loop stuff.
> Once we go change silicon, you might as well do it right.
>
None of the major x86 vendors are under my control.
--
error compiling committee.c: too many arguments to function
next prev parent reply other threads:[~2009-05-20 9:05 UTC|newest]
Thread overview: 79+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-05-05 14:09 [PATCH][KVM] Add support for Pause Filtering to AMD SVM Mark Langsdorf
2009-05-05 16:05 ` Bert Wesarg
2009-05-07 13:55 ` Joerg Roedel
2009-05-07 15:00 ` [PATCH][KVM][retry 1] " Mark Langsdorf
2009-05-07 15:00 ` [PATCH][retry " Mark Langsdorf
2009-05-07 15:31 ` [PATCH][KVM][retry " Avi Kivity
2009-05-11 14:15 ` Ingo Molnar
2009-05-11 14:15 ` [PATCH][retry " Ingo Molnar
2009-05-11 14:24 ` [PATCH][KVM][retry " Avi Kivity
2009-05-11 14:24 ` [PATCH][retry " Avi Kivity
2009-05-11 14:33 ` [PATCH][KVM][retry " Ingo Molnar
2009-05-11 14:33 ` [PATCH][retry " Ingo Molnar
2009-05-11 14:51 ` [PATCH][KVM][retry " Avi Kivity
2009-05-11 14:51 ` [PATCH][retry " Avi Kivity
2009-05-11 14:59 ` [PATCH][KVM][retry " Ingo Molnar
2009-05-11 14:59 ` [PATCH][retry " Ingo Molnar
2009-05-11 15:12 ` [PATCH][KVM][retry " Avi Kivity
2009-05-11 15:12 ` [PATCH][retry " Avi Kivity
2009-05-11 15:18 ` [PATCH][KVM][retry " Ingo Molnar
2009-05-11 15:18 ` [PATCH][retry " Ingo Molnar
2009-05-11 15:28 ` [PATCH][KVM][retry " Avi Kivity
2009-05-11 15:28 ` [PATCH][retry " Avi Kivity
2009-05-11 15:36 ` [PATCH][KVM][retry " Langsdorf, Mark
2009-05-11 15:36 ` [PATCH][retry " Langsdorf, Mark
2009-05-11 15:40 ` [PATCH][KVM][retry " Avi Kivity
2009-05-11 15:58 ` [PATCH][KVM][retry 1] Add support for Pause Filtering to AMDSVM Langsdorf, Mark
2009-05-11 15:58 ` [PATCH][retry " Langsdorf, Mark
2009-05-11 15:01 ` [PATCH][KVM][retry 1] Add support for Pause Filtering to AMD SVM Peter Zijlstra
2009-05-11 15:01 ` [PATCH][retry " Peter Zijlstra
2009-05-11 15:06 ` [PATCH][KVM][retry " Avi Kivity
2009-05-11 15:06 ` [PATCH][retry " Avi Kivity
2009-05-11 14:42 ` [PATCH][KVM][retry " Peter Zijlstra
2009-05-11 15:05 ` Avi Kivity
2009-05-11 15:05 ` [PATCH][retry " Avi Kivity
2009-05-08 17:03 ` [PATCH][KVM][retry 2] " Mark Langsdorf
2009-05-08 17:03 ` [PATCH][retry " Mark Langsdorf
2009-05-08 18:44 ` [PATCH][KVM][retry " Avi Kivity
2009-05-08 18:44 ` [PATCH][retry " Avi Kivity
2009-05-08 18:47 ` [PATCH][KVM][retry " Langsdorf, Mark
2009-05-08 18:47 ` [PATCH][retry " Langsdorf, Mark
2009-05-19 18:56 ` [PATCH][KVM][retry 3] " Mark Langsdorf
2009-05-19 18:56 ` [PATCH][retry " Mark Langsdorf
2009-05-20 7:40 ` [PATCH][KVM][retry " Ingo Molnar
2009-05-20 7:59 ` Peter Zijlstra
2009-05-20 7:59 ` [PATCH][retry " Peter Zijlstra
2009-05-20 8:38 ` [PATCH][KVM][retry " Avi Kivity
2009-05-20 8:38 ` [PATCH][retry " Avi Kivity
2009-05-20 8:42 ` [PATCH][KVM][retry " Peter Zijlstra
2009-05-20 8:42 ` [PATCH][retry " Peter Zijlstra
2009-05-20 8:49 ` [PATCH][KVM][retry " Avi Kivity
2009-05-20 8:49 ` [PATCH][retry " Avi Kivity
2009-05-20 8:54 ` [PATCH][KVM][retry " Peter Zijlstra
2009-05-20 8:54 ` [PATCH][retry " Peter Zijlstra
2009-05-20 9:04 ` Avi Kivity [this message]
2009-05-20 9:04 ` Avi Kivity
2009-05-20 9:10 ` [PATCH][KVM][retry " Peter Zijlstra
2009-05-20 9:10 ` [PATCH][retry " Peter Zijlstra
2009-05-20 9:17 ` [PATCH][KVM][retry " Avi Kivity
2009-05-20 9:17 ` [PATCH][retry " Avi Kivity
2009-05-20 13:52 ` [PATCH][KVM][retry " Langsdorf, Mark
2009-05-20 13:52 ` [PATCH][retry " Langsdorf, Mark
2009-05-20 12:00 ` [PATCH][KVM][retry " Avi Kivity
2009-05-20 12:00 ` [PATCH][retry " Avi Kivity
2009-05-20 22:25 ` [PATCH][KVM][retry 4] " Mark Langsdorf
2009-05-20 22:25 ` [PATCH][retry " Mark Langsdorf
2009-05-21 8:47 ` [PATCH][KVM][retry " Avi Kivity
2009-05-21 8:47 ` [PATCH][retry " Avi Kivity
2009-07-08 5:19 ` [PATCH][KVM][retry " Sheng Yang
2009-07-08 5:19 ` [PATCH][retry " Sheng Yang
2009-07-08 14:59 ` [PATCH][KVM][retry " Langsdorf, Mark
2009-07-08 14:59 ` [PATCH][retry " Langsdorf, Mark
2009-07-09 1:50 ` [PATCH][KVM][retry " Sheng Yang
2009-07-09 1:50 ` [PATCH][retry " Sheng Yang
2009-07-22 22:40 ` [PATCH][KVM][retry " Langsdorf, Mark
2009-07-22 22:40 ` [PATCH][retry " Langsdorf, Mark
2009-08-05 9:08 ` [PATCH][KVM][retry " Zhai, Edwin
2009-08-05 9:08 ` [PATCH][retry " Zhai, Edwin
2009-05-11 14:38 ` [PATCH][KVM] " Peter Zijlstra
2009-05-11 14:51 ` Ingo Molnar
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