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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
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Thread-index: AcWexp/oFlvjrv6aQZaOYZB5Zh8vwAABZj1Q
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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