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

["Ian Pratt" <m+Ian.Pratt@xxxxxxxxxxxx>]

> -----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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