[Xen-devel] [PATCH v7 3/6] public/xen.h: add a definition for a 'valid domid' mask

[Paul Durrant <pdurrant@xxxxxxxxxx>]

A subsequent patch will modify libxl to allow selection of a random domid
value when creating domains. Valid values are limited to a width of 15 bits,
so add an appropriate mask definition to the public header.

NOTE: It is reasonable for this mask definition to be in a Xen public header
      rather than in, say, a libxenctrl header since it relates to the
      validity of a value passed to XEN_DOMCTL_createdomain. This new
      definition is placed in xen.h rather than domctl.h only to co-locate
      it with other domid-related defitions.

Signed-off-by: Paul Durrant <pdurrant@xxxxxxxxxx>
Reviewed-by: Ian Jackson <ian.jackson@xxxxxxxxxxxxx>
---
Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
Cc: George Dunlap <George.Dunlap@xxxxxxxxxxxxx>
Cc: Jan Beulich <jbeulich@xxxxxxxx>
Cc: Julien Grall <julien@xxxxxxx>
Cc: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
Cc: Stefano Stabellini <sstabellini@xxxxxxxxxx>
Cc: Wei Liu <wl@xxxxxxx>

v6:
 - New in v6 (split out from another patch)
---
 xen/include/public/xen.h | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/xen/include/public/xen.h b/xen/include/public/xen.h
index d2198dffad..75b1619d0d 100644
--- a/xen/include/public/xen.h
+++ b/xen/include/public/xen.h
@@ -614,6 +614,9 @@ DEFINE_XEN_GUEST_HANDLE(mmuext_op_t);
 /* Idle domain. */
 #define DOMID_IDLE           xen_mk_uint(0x7FFF)
 
+/* Mask for valid domain id values */
+#define DOMID_MASK           xen_mk_uint(0x7FFF)
+
 #ifndef __ASSEMBLY__
 
 typedef uint16_t domid_t;
-- 
2.20.1


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