From: Keir Fraser <keir.xen@gmail.com>
To: Andrew Cooper <andrew.cooper3@citrix.com>,
Xen-devel <xen-devel@lists.xen.org>
Cc: Jan Beulich <JBeulich@suse.com>
Subject: Re: [Patch v2] x86/boot: Use mov to cr0 in preference to lmsw
Date: Wed, 28 Aug 2013 13:54:50 +0100 [thread overview]
Message-ID: <CE43B1AA.321DB%keir.xen@gmail.com> (raw)
In-Reply-To: <1377686207-16713-1-git-send-email-andrew.cooper3@citrix.com>
On 28/08/2013 11:36, "Andrew Cooper" <andrew.cooper3@citrix.com> wrote:
> lmsw is for compability for 286 processors only, and any more modern
> processors are recomended to use mov to cr0. Xen has never been capable of
> booting on a 286, given its multiboot entry.
>
> Furthermore, this avoids needless playing with the MP, EM and TS bits. These
> do get explicitly chosen slightly later on boot.
>
> Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com>
> CC: Keir Fraser <keir@xen.org>
> CC: Jan Beulich <JBeulich@suse.com>
I don't know. This seems quite pointless.
prev parent reply other threads:[~2013-08-28 12:54 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-08-28 10:05 [PATCH] x86/boot: Use mov to cr0 in preference to lmsw Andrew Cooper
2013-08-28 10:22 ` Jan Beulich
2013-08-28 10:33 ` Andrew Cooper
2013-08-28 10:36 ` [Patch v2] " Andrew Cooper
2013-08-28 12:54 ` Keir Fraser [this message]
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