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

["Xin, Xiaohui" <xiaohui.xin@xxxxxxxxx>]

>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@xxxxxxxxxxxx] 
Sent: 2006年8月31日 18:03
To: Xin, Xiaohui; xen-devel@xxxxxxxxxxxxxxxxxxx
Cc: ian.pratt@xxxxxxxxxxxx
Subject: RE: [Xen-devel][PATCH]Fix a shadow error with L*_DISALLOW_MASK for 
HVM64bit guest



> -----Original Message-----
> From: xen-devel-bounces@xxxxxxxxxxxxxxxxxxx [mailto:xen-devel-
> bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of Xin, Xiaohui
> Sent: 31 August 2006 09:03
> To: xen-devel@xxxxxxxxxxxxxxxxxxx
> 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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