xen: Free xenforeignmemory_resource at exit

Because Coverity complains about it and this is one leak that Valgrind
reports.

Signed-off-by: Anthony PERARD <anthony.perard@citrix.com>
Acked-by: Paul Durrant <paul@xen.org>
Message-Id: <20210430163742.469739-1-anthony.perard@citrix.com>
Signed-off-by: Anthony PERARD <anthony.perard@citrix.com>
(cherry picked from commit f1e43b6026500690fc402828fa7cc735175b93b6)

diff --git a/hw/i386/xen/xen-hvm.c b/hw/i386/xen/xen-hvm.c
index 7ce672e5a5c308e1a6283a30807dc5346143b40f..47ed7772fa397dd4510df2ab50a88eb834d2a4d4 100644 (file)
--- a/hw/i386/xen/xen-hvm.c
+++ b/hw/i386/xen/xen-hvm.c
@@ -109,6 +109,7 @@ typedef struct XenIOState {
     shared_iopage_t *shared_page;
     shared_vmport_iopage_t *shared_vmport_page;
     buffered_iopage_t *buffered_io_page;
+    xenforeignmemory_resource_handle *fres;
     QEMUTimer *buffered_io_timer;
     CPUState **cpu_by_vcpu_id;
     /* the evtchn port for polling the notification, */
@@ -1254,6 +1255,9 @@ static void xen_exit_notifier(Notifier *n, void *data)
     XenIOState *state = container_of(n, XenIOState, exit);
 
     xen_destroy_ioreq_server(xen_domid, state->ioservid);
+    if (state->fres != NULL) {
+        xenforeignmemory_unmap_resource(xen_fmem, state->fres);
+    }
 
     xenevtchn_close(state->xce_handle);
     xs_daemon_close(state->xenstore);
@@ -1321,7 +1325,6 @@ static void xen_wakeup_notifier(Notifier *notifier, void *data)
 static int xen_map_ioreq_server(XenIOState *state)
 {
     void *addr = NULL;
-    xenforeignmemory_resource_handle *fres;
     xen_pfn_t ioreq_pfn;
     xen_pfn_t bufioreq_pfn;
     evtchn_port_t bufioreq_evtchn;
@@ -1333,12 +1336,12 @@ static int xen_map_ioreq_server(XenIOState *state)
      */
     QEMU_BUILD_BUG_ON(XENMEM_resource_ioreq_server_frame_bufioreq != 0);
     QEMU_BUILD_BUG_ON(XENMEM_resource_ioreq_server_frame_ioreq(0) != 1);
-    fres = xenforeignmemory_map_resource(xen_fmem, xen_domid,
+    state->fres = xenforeignmemory_map_resource(xen_fmem, xen_domid,
                                          XENMEM_resource_ioreq_server,
                                          state->ioservid, 0, 2,
                                          &addr,
                                          PROT_READ | PROT_WRITE, 0);
-    if (fres != NULL) {
+    if (state->fres != NULL) {
         trace_xen_map_resource_ioreq(state->ioservid, addr);
         state->buffered_io_page = addr;
         state->shared_page = addr + TARGET_PAGE_SIZE;

diff --git a/include/hw/xen/xen_common.h b/include/hw/xen/xen_common.h
index 82e56339dd7ef3448b7c0d24b46ab9189c9f1a5c..a8118b41acfb7b2c45e06644a6e6d705a4346cd8 100644 (file)
--- a/include/hw/xen/xen_common.h
+++ b/include/hw/xen/xen_common.h
@@ -134,6 +134,12 @@ static inline xenforeignmemory_resource_handle *xenforeignmemory_map_resource(
     return NULL;
 }
 
+static inline int xenforeignmemory_unmap_resource(
+    xenforeignmemory_handle *fmem, xenforeignmemory_resource_handle *fres)
+{
+    return 0;
+}
+
 #endif /* CONFIG_XEN_CTRL_INTERFACE_VERSION < 41100 */
 
 #if CONFIG_XEN_CTRL_INTERFACE_VERSION < 41000