[Xen-devel] [PATCH] Frame type pinning: add support for PGT_none

["Clark, Christopher W" <christopher.w.clark@xxxxxxxxx>]

Xen provides a facility to guest kernels to 'pin' frames to a specific
type, where the type indicates the frame contents, distinguishing page
tables from writable pages. The ability to pin a page as a readonly
frame -- and hence prevent any writable pagetable mappings being made to
it -- has been omitted, and this is remedied by this patch.

Also included is an example of use: a linux kernel parameter is added to
enable a guest to pin the frames containing the system call table and
zero page as readonly, to prevent subsequent writes to these frames.

Signed-off-by: Christopher Clark

Attachment: pinro.diff
Description: pinro.diff

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