dm_op: convert HVMOP_track_dirty_vram

The handle type passed to the underlying shadow and hap functions is
changed for compatibility with the new hypercall buffer.

NOTE: This patch also modifies the type of the 'nr' parameter of
      xc_hvm_track_dirty_vram() from uint64_t to uint32_t. In practice
      the value passed was always truncated to 32 bits.

Suggested-by: Jan Beulich <jbeulich@suse.com>
Signed-off-by: Paul Durrant <paul.durrant@citrix.com>
Acked-by: Wei Liu <wei.liu2@citrix.com>
Acked-by: George Dunlap <george.dunlap@eu.citrix.com>
Acked-by: Tim Deegan <tim@xen.org>
Acked-by: Daniel De Graaf <dgdegra@tycho.nsa.gov>
Reviewed-by: Jan Beulich <jbeulich@suse.com>
Reviewed-by: Andrew Cooper <andrew.cooper3@citrix.com>

tools/flask/policy/modules/xen.if

@@ -58,7 +58,7 @@ define(`create_domain_common', `
 	allow $1 $2:mmu { map_read map_write adjust memorymap physmap pinpage mmuext_op updatemp };
 	allow $1 $2:grant setup;
 	allow $1 $2:hvm { cacheattr getparam hvmctl irqlevel pciroute sethvmc
-			setparam pcilevel trackdirtyvram nested altp2mhvm altp2mhvm_op send_irq };
+			setparam pcilevel nested altp2mhvm altp2mhvm_op send_irq };
 ')
 
 # create_domain(priv, target)
@@ -151,7 +151,7 @@ define(`device_model', `
 
 	allow $1 $2_target:domain { getdomaininfo shutdown };
 	allow $1 $2_target:mmu { map_read map_write adjust physmap target_hack };
-	allow $1 $2_target:hvm { getparam setparam trackdirtyvram hvmctl irqlevel pciroute pcilevel cacheattr send_irq dm };
+	allow $1 $2_target:hvm { getparam setparam hvmctl irqlevel pciroute pcilevel cacheattr send_irq dm };
 ')
 
 # make_device_model(priv, dm_dom, hvm_dom)