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

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Subject: [Xen-devel] [PATCH] Frame type pinning: add support for PGT_none
From: "Clark, Christopher W" <christopher.w.clark@xxxxxxxxx>
Date: Thu, 28 Jul 2005 13:31:57 -0700
Delivery-date: Thu, 28 Jul 2005 20:30:32 +0000
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Thread-index: AcWTs2Y+Aak8OA4LQCWxUWe1KBvPpA==
Thread-topic: [PATCH] Frame type pinning: add support for PGT_none
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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