RE: [Xen-ia64-devel] RE: [Xen-devel] [PATCH] blkif include fixes

To:	"Arun Sharma" <arun.sharma@xxxxxxxxx>, "Magenheimer, Dan \(HP Labs Fort Collins\)" <dan.magenheimer@xxxxxx>
Subject:	RE: [Xen-ia64-devel] RE: [Xen-devel] [PATCH] blkif include fixes
From:	"Ian Pratt" <m+Ian.Pratt@xxxxxxxxxxxx>
Date:	Fri, 12 Aug 2005 00:53:35 +0100
Cc:	"Ling, Xiaofeng" <xiaofeng.ling@xxxxxxxxx>, xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxx>, xen-ia64-devel@xxxxxxxxxxxxxxxxxxx
Delivery-date:	Thu, 11 Aug 2005 23:51:53 +0000
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Thread-topic:	[Xen-ia64-devel] RE: [Xen-devel] [PATCH] blkif include fixes

> What we have not figured out is, how to handle the case where 
> the netfront driver tries to transfer the ownership of a page 
> to another domain. It does this by writing to the 
> phys_to_machine_mapping[] array.
> 
> While we can easily map the phys_to_machine table into a VMX 
> guest, it's not clear that:
> a) allowing the guest to modify it is safe

For translate shadow mode guests we need to do the p2m update in Xen in
the gnttab hypercalls.

Ian


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RE: [Xen-ia64-devel] RE: [Xen-devel] [PATCH] blkif include fixes