hw/xen-hvm: Add a mapcache arg to xen_register_ioreq()

Add a mapcache argument to xen_register_ioreq() allowing
the caller to optionally disable the mapcache.

All callers still call it with mapcache = true so there's no
functional change yet.

Signed-off-by: Edgar E. Iglesias <edgar.iglesias@amd.com>
Reviewed-by: Stefano Stabellini <sstabellini@kernel.org>

hw/i386/xen/xen-hvm.c

@@ -622,7 +622,7 @@ void xen_hvm_init_pc(PCMachineState *pcms, MemoryRegion **ram_memory)
 
     xen_register_ioreq(state, max_cpus,
                        HVM_IOREQSRV_BUFIOREQ_ATOMIC,
-                       &xen_memory_listener);
+                       &xen_memory_listener, true);
 
     xen_is_stubdomain = xen_check_stubdomain(state->xenstore);
 

hw/xen/xen-hvm-common.c

@@ -473,7 +473,9 @@ static void handle_ioreq(XenIOState *state, ioreq_t *req)
         case IOREQ_TYPE_TIMEOFFSET:
             break;
         case IOREQ_TYPE_INVALIDATE:
-            xen_invalidate_map_cache();
+            if (xen_map_cache_enabled()) {
+                xen_invalidate_map_cache();
+            }
             break;
         case IOREQ_TYPE_PCI_CONFIG:
             cpu_ioreq_config(state, req);
@@ -823,7 +825,8 @@ void xen_shutdown_fatal_error(const char *fmt, ...)
 
 static void xen_do_ioreq_register(XenIOState *state,
                                   unsigned int max_cpus,
-                                  const MemoryListener *xen_memory_listener)
+                                  const MemoryListener *xen_memory_listener,
+                                  bool mapcache)
 {
     int i, rc;
 
@@ -874,11 +877,13 @@ static void xen_do_ioreq_register(XenIOState *state,
         state->bufioreq_local_port = rc;
     }
     /* Init RAM management */
+    if (mapcache) {
 #ifdef XEN_COMPAT_PHYSMAP
-    xen_map_cache_init(xen_phys_offset_to_gaddr, state);
+        xen_map_cache_init(xen_phys_offset_to_gaddr, state);
 #else
-    xen_map_cache_init(NULL, state);
+        xen_map_cache_init(NULL, state);
 #endif
+    }
 
     qemu_add_vm_change_state_handler(xen_hvm_change_state_handler, state);
 
@@ -901,7 +906,8 @@ err:
 
 void xen_register_ioreq(XenIOState *state, unsigned int max_cpus,
                         uint8_t handle_bufioreq,
-                        const MemoryListener *xen_memory_listener)
+                        const MemoryListener *xen_memory_listener,
+                        bool mapcache)
 {
     int rc;
 
@@ -922,7 +928,7 @@ void xen_register_ioreq(XenIOState *state, unsigned int max_cpus,
     state->has_bufioreq = handle_bufioreq != HVM_IOREQSRV_BUFIOREQ_OFF;
     rc = xen_create_ioreq_server(xen_domid, handle_bufioreq, &state->ioservid);
     if (!rc) {
-        xen_do_ioreq_register(state, max_cpus, xen_memory_listener);
+        xen_do_ioreq_register(state, max_cpus, xen_memory_listener, mapcache);
     } else {
         warn_report("xen: failed to create ioreq server");
     }

hw/xen/xen-pvh-common.c

@@ -202,7 +202,8 @@ static void xen_pvh_init(MachineState *ms)
     xen_pvh_init_ram(s, sysmem);
     xen_register_ioreq(&s->ioreq, ms->smp.max_cpus,
                        xpc->handle_bufioreq,
-                       &xen_memory_listener);
+                       &xen_memory_listener,
+                       true);
 
     if (s->cfg.virtio_mmio_num) {
         xen_create_virtio_mmio_devices(s);

include/hw/xen/xen-hvm-common.h

@@ -91,7 +91,8 @@ void xen_device_unrealize(DeviceListener *listener, DeviceState *dev);
 void xen_hvm_change_state_handler(void *opaque, bool running, RunState rstate);
 void xen_register_ioreq(XenIOState *state, unsigned int max_cpus,
                         uint8_t handle_bufioreq,
-                        const MemoryListener *xen_memory_listener);
+                        const MemoryListener *xen_memory_listener,
+                        bool mapcache);
 
 void cpu_ioreq_pio(ioreq_t *req);
 #endif /* HW_XEN_HVM_COMMON_H */