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[Xen-devel] Shadow's Dirty Bit Problem

from [zhujun]

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Subject:	[Xen-devel] Shadow's Dirty Bit Problem
From:	"zhujun" <zhujun@xxxxxxxxxxxxxx>
Date:	Sun, 28 Jun 2009 14:04:08 +0800
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Hi,

In the function _sh_propagate, the A&D bits of all the shadow page tables entries above level 1 will be set. (// Set the A&D bits for higher level shadows). I am very confused about it. From Intel manual, the Dirty bit above level 1 is reserved and must be set 0. Am I right? If yes, how does the shadow page table deal with this problem?

Another question. In Xen’s current version, does it use the Dirty bit to do something?

zhujun

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