From: Avi Kivity <avi@redhat.com>
To: Andi Kleen <andi@firstfloor.org>
Cc: Alexander Graf <agraf@suse.de>,
"Serebrin,
Benjamin (Calendar)" <Benjamin.Serebrin@exchange.amd.com>,
Skywing <Skywing@valhallalegends.com>,
Anthony Liguori <anthony@codemonkey.ws>,
kvm@vger.kernel.org, Amit Shah <amit.shah@redhat.com>,
"Wahlig, Elsie" <elsie.wahlig@amd.com>,
"Nakajima, Jun" <jun.nakajima@intel.com>
Subject: Re: Cross vendor migration ideas
Date: Mon, 17 Nov 2008 13:59:21 +0200 [thread overview]
Message-ID: <49215C99.8080800@redhat.com> (raw)
In-Reply-To: <20081117110934.GH6703@one.firstfloor.org>
Andi Kleen wrote:
>> But at least for Linux, if we notify the
>> guest telling it to retune (which can include the vsyscall path) we can
>> avoid the cost entirely.
>>
>
> Hmm, we discussed something like this some time ago anyways (add
> a way to rescan CPUID features) because there are microcode updates
> around that change some (relatively obscure) CPUID features.
>
> But doing it fully general would be likely quite intrusive. You
> would need to rewrite the CPU initialization code and some other
> code in a callback like matter like the PCI code does for hotplug.
>
>
The primary consumer would be compat mode syscall/sysenter. Page copy
would be a secondary consumer. All the rest are likely in the noise.
Hmm, maybe also the raid5+ algorithms.
--
error compiling committee.c: too many arguments to function
next prev parent reply other threads:[~2008-11-17 11:59 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-11-12 15:39 Cross vendor migration ideas Alexander Graf
2008-11-12 15:45 ` Anthony Liguori
2008-11-12 15:50 ` Alexander Graf
2008-11-12 15:59 ` Anthony Liguori
2008-11-13 0:02 ` Skywing
2008-11-13 1:48 ` Serebrin, Benjamin (Calendar)
2008-11-15 13:03 ` Andi Kleen
2008-11-15 16:39 ` Alexander Graf
2008-11-15 17:37 ` Andi Kleen
2008-11-16 15:36 ` Avi Kivity
2008-11-17 11:09 ` Andi Kleen
2008-11-17 11:59 ` Avi Kivity [this message]
2008-11-15 17:38 ` Glauber Costa
2008-11-16 14:58 ` Avi Kivity
2008-11-13 10:16 ` Avi Kivity
2008-11-12 20:06 ` Andi Kleen
2008-11-12 20:52 ` Alexander Graf
2008-11-13 10:20 ` Avi Kivity
2008-11-12 16:52 ` Amit Shah
2008-11-12 17:19 ` Alexander Graf
2008-11-13 4:35 ` Amit Shah
2008-11-13 13:38 ` Alexander Graf
2008-11-14 13:07 ` Amit Shah
2008-11-14 23:43 ` Nitin A Kamble
2008-11-17 10:07 ` Amit Shah
-- strict thread matches above, loose matches on Subject: below --
2008-11-16 0:23 Skywing
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