From: Andi Kleen <andi@firstfloor.org>
To: Anthony Liguori <anthony@codemonkey.ws>
Cc: Alexander Graf <agraf@suse.de>,
"kvm@vger.kernel.org list" <kvm@vger.kernel.org>,
Amit Shah <amit.shah@redhat.com>, Avi Kivity <avi@redhat.com>,
Elsie Wahlig <elsie.wahlig@amd.com>,
"Serebrin,
Benjamin (Calendar)" <Benjamin.Serebrin@exchange.amd.com>,
"Nakajima, Jun" <jun.nakajima@intel.com>
Subject: Re: Cross vendor migration ideas
Date: Wed, 12 Nov 2008 21:06:48 +0100 [thread overview]
Message-ID: <87vdusd7zb.fsf@basil.nowhere.org> (raw)
In-Reply-To: <491AFA36.4040909@codemonkey.ws> (Anthony Liguori's message of "Wed, 12 Nov 2008 09:45:58 -0600")
Anthony Liguori <anthony@codemonkey.ws> writes:
>
> I wonder if patching is an option?
Not by patching instructions because SYSENTER and SYSCALL have
completely different semantics (e.g. regarding register use). That is
why the entry paths are different on both sides.
In theory you could switch the entry paths around, but that would
be highly kernel version specific.
One easy way is to just clear the SEP and SYSCALL32 flags
in CPUID, then int 0x80 will be always used. Of course it'll
cost you in performance significantly. I wouldn't recommend
to make it default.
-Andi
--
ak@linux.intel.com
next prev parent reply other threads:[~2008-11-12 19:49 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
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 [this message]
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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