libs/xg: allow caller to provide extra memflags for populate physmap

Introduce an additional memflags field to the xc_dom_image and
xc_sr_context structures and use it to pass additional memflags to use when
populating the domain physmap.

No meaningful usages of this new field are added as part of the patch.  The
only know usage will be from the XAPI domain builder, which lives in a
different repository.

Signed-off-by: Roger Pau Monné <roger.pau@citrix.com>
Acked-by: Anthony PERARD <anthony.perard@vates.tech>

tools/include/xenguest.h

@@ -242,6 +242,9 @@ struct xc_dom_image {
 
     /* Number of vCPUs */
     unsigned int max_vcpus;
+
+    /* Caller provided memflags to use when populating physmap. */
+    unsigned int memflags;
 };
 
 /* --- arch specific hooks ----------------------------------------- */
@@ -611,6 +614,8 @@ struct restore_callbacks {
  *        specific data
  * @param send_back_fd Only used for XC_STREAM_COLO.  Contains backchannel to
  *        the source side.
+ * @param memflags Optional memflags to pass in
+ *        xc_domain_populate_physmap{_exact}() calls.
  * @return 0 on success, -1 on failure
  */
 int xc_domain_restore(xc_interface *xch, int io_fd, uint32_t dom,
@@ -618,7 +623,8 @@ int xc_domain_restore(xc_interface *xch, int io_fd, uint32_t dom,
                       uint32_t store_domid, unsigned int console_evtchn,
                       unsigned long *console_mfn, uint32_t console_domid,
                       xc_stream_type_t stream_type,
-                      struct restore_callbacks *callbacks, int send_back_fd);
+                      struct restore_callbacks *callbacks, int send_back_fd,
+                      unsigned int memflags);
 
 /**
  * This function will create a domain for a paravirtualized Linux