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From: Tim Deegan <Tim.Deegan@xensource.com>
To: "Li, Xin B" <xin.b.li@intel.com>
Cc: Tim Deegan <Tim.Deegan@xensource.com>, xen-devel@lists.xensource.com
Subject: Re: recreate monitor page table?
Date: Wed, 18 Apr 2007 16:59:08 +0100	[thread overview]
Message-ID: <20070418155908.GA719@york.uk.xensource.com> (raw)
In-Reply-To: <B30DA1341B0CFA4893EF8A36B40B5C5D0108B20B@pdsmsx411.ccr.corp.intel.com>

Hi :)

At 23:46 +0800 on 18 Apr (1176940011), Li, Xin B wrote:
> On x86_64, monitor page table should always be 4 level, and we can
> uninstall the old shadow linear entry and install new shadow paging mode
> entry, why even recreate the monitor top level page?

We could have made a routine to adjust the layout of the monitor table
given the old and new modes, but it would have to understand two modes
at once, which nothing else in multi.c does.  It would also reproduce 
code that's already in sh_make_monitor_table and sh_destroy_monitor_table.
Since we don't expect it to be worth optimizing this path, we just used
the existing routines.

Cheers,

Tim.  

-- 
Tim Deegan <Tim.Deegan@xensource.com>, XenSource UK Limited
Registered office c/o EC2Y 5EB, UK; company number 05334508

  parent reply	other threads:[~2007-04-18 15:59 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-04-18  2:13 recreate monitor page table? Li, Xin B
2007-04-18 12:52 ` Tim Deegan
2007-04-18 15:46   ` Li, Xin B
2007-04-18 15:54     ` Keir Fraser
2007-04-18 15:59     ` Tim Deegan [this message]
2007-04-18 16:02       ` Li, Xin B
2007-04-18 13:03 ` Keir Fraser

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