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Grant table version

From: Vladimir 'φ-coder/phcoder' Serbinenko
Subject: Grant table version
Date: Mon, 28 Oct 2013 19:06:02 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20131005 Icedove/17.0.9

Hello, all. I'm working on pvgrub2 and my problem is following:
When you first use grant tables you commit yourself to a particular
grant table version. GRUB has to read from disk and hence use grant
tables. By doing so it commits anything that it loads to the same version.
Would it be possible to have a hypercall to reset grant table version?
Of course, before doing such a call one would need to revoke all grants
or this call would discard all current grants.

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