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| author | Keir Fraser <keir.fraser@citrix.com> | 2009-12-17 06:27:56 +0000 |
|---|---|---|
| committer | Keir Fraser <keir.fraser@citrix.com> | 2009-12-17 06:27:56 +0000 |
| commit | 38edca187daf8961d574f0e9cec8d775f6271e35 (patch) | |
| tree | b68271b7a481e18989fd3c769a91cd48139309ee /xen/include/public/xen.h | |
| parent | 287d07f6a7b84d9caf6e734f987a02ef5de7561c (diff) | |
| download | xen-38edca187daf8961d574f0e9cec8d775f6271e35.tar.gz xen-38edca187daf8961d574f0e9cec8d775f6271e35.tar.bz2 xen-38edca187daf8961d574f0e9cec8d775f6271e35.zip | |
This patch defines a new PGT type called PGT_shared_page and a new synthetic
domain called 'dom_cow'. In order to share a page, the type needs to be changed
to PGT_shared_page and the owner to dom_dow. Only pages with PGT_none, and no
type count are allowed to become sharable. Conversly, sharable pages can only be
made 'private' if type count equals one. page_make_sharable() and
page_make_private() handle these transitions.
Signed-off-by: Grzegorz Milos <Grzegorz.Milos@citrix.com>
Diffstat (limited to 'xen/include/public/xen.h')
| -rw-r--r-- | xen/include/public/xen.h | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/xen/include/public/xen.h b/xen/include/public/xen.h index 22161ae769..1a5e3e840c 100644 --- a/xen/include/public/xen.h +++ b/xen/include/public/xen.h @@ -366,6 +366,10 @@ typedef uint16_t domid_t; */ #define DOMID_XEN (0x7FF2U) +/* + * DOMID_COW is used as the owner of sharable pages */ +#define DOMID_COW (0x7FF3U) + /* DOMID_INVALID is used to identity invalid domid */ #define DOMID_INVALID (0x7FFFU) |