From: Keir Fraser <keir.fraser@eu.citrix.com>
To: "Lu, Guanqun" <guanqun.lu@intel.com>,
"jbeulich@novell.com" <jbeulich@novell.com>
Cc: xen-devel组 <xen-devel@lists.xensource.com>
Subject: Re: question about patch 13252
Date: Thu, 19 Mar 2009 14:22:39 +0000 [thread overview]
Message-ID: <C5E805AF.48A3%keir.fraser@eu.citrix.com> (raw)
In-Reply-To: <8FED46E8A9CA574792FC7AACAC38FE7701CB8168A6@PDSMSX501.ccr.corp.intel.com>
On 19/03/2009 14:07, "Lu, Guanqun" <guanqun.lu@intel.com> wrote:
> I have such question about the number 11, 11 is 1010 in binary format,
Try again. :D
> which means that the busy flat is set. Then later, load_TR() is called.
> load_TR() is a wrapper around instruction 'ltr'. As I consult SDM2A,
> it says that ltr will generate #GP, when the busy flag is set.
>
> So I'm a little puzzled. Can you explain a little why it's not 9 ?
> Or am I missing something here?
We only execute LTR once at start of day for each CPU. This is done while
running on the non-compat gdt_table. When we switch to compat_gdt_table we
do not do any LTR switch. I suppose Jan sets the busy bit to match what will
be in the non-compat table after we have executed our one-off LTR.
-- Keir
next prev parent reply other threads:[~2009-03-19 14:22 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-03-19 14:07 question about patch 13252 Lu, Guanqun
2009-03-19 14:20 ` Lu, Guanqun
2009-03-19 14:22 ` Keir Fraser [this message]
2009-03-19 14:34 ` Lu, Guanqun
2009-03-19 14:49 ` Keir Fraser
2009-03-19 14:58 ` Jan Beulich
2009-03-19 17:06 ` Keir Fraser
2009-03-20 5:34 ` Lu, Guanqun
2009-03-20 5:35 ` Lu, Guanqun
2009-03-19 14:53 ` Jan Beulich
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