[Qemu-devel] [RFC v1 04/22] xen_pt: use separate MemoryListeners for memory and I/O

[Avi Kivity <avi@redhat.com>]

Using an unfiltered memory listener will cause regions to be reported
fails multiple times if we have more than two address spaces.  Use a separate
listener for memory and I/O, and utilize MemoryListener's address space
filtering to fix this.

Signed-off-by: Avi Kivity <avi@redhat.com>
---
 hw/xen_pt.c | 38 +++++++++++++++++++++++++++++++++++++-
 hw/xen_pt.h |  1 +
 2 files changed, 38 insertions(+), 1 deletion(-)

diff --git a/hw/xen_pt.c b/hw/xen_pt.c
index 307119a..438ad54 100644
--- a/hw/xen_pt.c
+++ b/hw/xen_pt.c
@@ -59,6 +59,7 @@
 #include "xen_backend.h"
 #include "xen_pt.h"
 #include "range.h"
+#include "exec-memory.h"
 
 #define XEN_PT_NR_IRQS (256)
 static uint8_t xen_pt_mapped_machine_irq[XEN_PT_NR_IRQS] = {0};
@@ -621,6 +622,22 @@ static void xen_pt_region_del(MemoryListener *l, MemoryRegionSection *sec)
     xen_pt_region_update(s, sec, false);
 }
 
+static void xen_pt_io_region_add(MemoryListener *l, MemoryRegionSection *sec)
+{
+    XenPCIPassthroughState *s = container_of(l, XenPCIPassthroughState,
+                                             io_listener);
+
+    xen_pt_region_update(s, sec, true);
+}
+
+static void xen_pt_io_region_del(MemoryListener *l, MemoryRegionSection *sec)
+{
+    XenPCIPassthroughState *s = container_of(l, XenPCIPassthroughState,
+                                             io_listener);
+
+    xen_pt_region_update(s, sec, false);
+}
+
 static void xen_pt_region_nop(MemoryListener *l, MemoryRegionSection *s)
 {
 }
@@ -654,6 +671,22 @@ static void xen_pt_eventfd_fns(MemoryListener *l, MemoryRegionSection *s,
     .priority = 10,
 };
 
+static const MemoryListener xen_pt_io_listener = {
+    .begin = xen_pt_begin,
+    .commit = xen_pt_commit,
+    .region_add = xen_pt_io_region_add,
+    .region_nop = xen_pt_region_nop,
+    .region_del = xen_pt_io_region_del,
+    .log_start = xen_pt_log_fns,
+    .log_stop = xen_pt_log_fns,
+    .log_sync = xen_pt_log_fns,
+    .log_global_start = xen_pt_log_global_fns,
+    .log_global_stop = xen_pt_log_global_fns,
+    .eventfd_add = xen_pt_eventfd_fns,
+    .eventfd_del = xen_pt_eventfd_fns,
+    .priority = 10,
+};
+
 /* init */
 
 static int xen_pt_initfn(PCIDevice *d)
@@ -691,6 +724,7 @@ static int xen_pt_initfn(PCIDevice *d)
     }
 
     s->memory_listener = xen_pt_memory_listener;
+    s->io_listener = xen_pt_io_listener;
 
     /* Handle real device's MMIO/PIO BARs */
     xen_pt_register_regions(s);
@@ -757,7 +791,8 @@ static int xen_pt_initfn(PCIDevice *d)
     }
 
 out:
-    memory_listener_register(&s->memory_listener, NULL);
+    memory_listener_register(&s->memory_listener, get_system_memory());
+    memory_listener_register(&s->io_listener, get_system_io());
     XEN_PT_LOG(d, "Real physical device %02x:%02x.%d registered successfuly!\n",
                bus, slot, func);
 
@@ -812,6 +847,7 @@ static void xen_pt_unregister_device(PCIDevice *d)
 
     xen_pt_unregister_regions(s);
     memory_listener_unregister(&s->memory_listener);
+    memory_listener_unregister(&s->io_listener);
 
     xen_host_pci_device_put(&s->real_device);
 }
diff --git a/hw/xen_pt.h b/hw/xen_pt.h
index 112477a..f15e69a 100644
--- a/hw/xen_pt.h
+++ b/hw/xen_pt.h
@@ -209,6 +209,7 @@ struct XenPCIPassthroughState {
     MemoryRegion rom;
 
     MemoryListener memory_listener;
+    MemoryListener io_listener;
 };
 
 int xen_pt_config_init(XenPCIPassthroughState *s);
-- 
1.7.12