Xen devel - Sep 2006 - RE: [PATCH]Fix a shadow error with L*_DISALLOW_MASK for HVM64bit guest

>From my experience booting 64bit Windows, it''s the x64 Windows XP
who use these bits in their page table entries.
Thanks
Xiaohui

-----Original Message-----
From: Ian Pratt [mailto:m+Ian.Pratt@cl.cam.ac.uk] 
Sent: 2006年8月31日 18:03
To: Xin, Xiaohui; xen-devel@lists.xensource.com
Cc: ian.pratt@cl.cam.ac.uk
Subject: RE: [Xen-devel][PATCH]Fix a shadow error with L*_DISALLOW_MASK for
HVM64bit guest


> -----Original Message-----
> From: xen-devel-bounces@lists.xensource.com [mailto:xen-devel-
> bounces@lists.xensource.com] On Behalf Of Xin, Xiaohui
> Sent: 31 August 2006 09:03
> To: xen-devel@lists.xensource.com
> Subject: [Xen-devel][PATCH]Fix a shadow error with L*_DISALLOW_MASK
for
> HVM64bit guest
> 
> This patch fixes a shadow error. For 64bit guest, the [62:52] bits of
PML4
> 4 levels page table entries is software available.
> 
> But the L*_DISALLOW_MASK forbids to generate this kind of shadow page
table
> entries.
Out of interest, do you know any OSes that use these bits? For PV 64b
guests we want Xen to use a s/w bit, and picking one that''s currently
unused by any OS would be good.

Thanks,
Ian

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