[Qemu-devel] [RFC 4/7] enable fw_cfg dma for arm virt

["Marc Marí" <markmb@redhat.com>]

From: Gerd Hoffmann <kraxel@redhat.com>

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
---
 docs/specs/fw_cfg.txt |  6 ++++++
 hw/arm/virt.c         | 11 ++++++++---
 2 files changed, 14 insertions(+), 3 deletions(-)

diff --git a/docs/specs/fw_cfg.txt b/docs/specs/fw_cfg.txt
index 64d9192..eac83a1 100644
--- a/docs/specs/fw_cfg.txt
+++ b/docs/specs/fw_cfg.txt
@@ -167,6 +167,12 @@ If a partial transfer happened before an error occured the address and
 length registers indicate how much data has been transfered
 successfully.
 
+== Register Locations ==
+
+=== arm ===
+
+classic fw_cfg base + 16
+
 = Host-side API =
 
 The following functions are available to the QEMU programmer for adding
diff --git a/hw/arm/virt.c b/hw/arm/virt.c
index 374660c..d05f6a4 100644
--- a/hw/arm/virt.c
+++ b/hw/arm/virt.c
@@ -606,13 +606,13 @@ static void create_flash(const VirtBoardInfo *vbi)
     g_free(nodename);
 }
 
-static void create_fw_cfg(const VirtBoardInfo *vbi)
+static void create_fw_cfg(AddressSpace *as, const VirtBoardInfo *vbi)
 {
     hwaddr base = vbi->memmap[VIRT_FW_CFG].base;
     hwaddr size = vbi->memmap[VIRT_FW_CFG].size;
     char *nodename;
 
-    fw_cfg_init_mem_wide(base + 8, base, 8, 0, NULL);
+    fw_cfg_init_mem_wide(base + 8, base, 8, 16, as);
 
     nodename = g_strdup_printf("/fw-cfg@%" PRIx64, base);
     qemu_fdt_add_subnode(vbi->fdt, nodename);
@@ -800,6 +800,7 @@ static void machvirt_init(MachineState *machine)
     VirtGuestInfoState *guest_info_state = g_malloc0(sizeof *guest_info_state);
     VirtGuestInfo *guest_info = &guest_info_state->info;
     char **cpustr;
+    AddressSpace *as = NULL;
 
     if (!cpu_model) {
         cpu_model = "cortex-a15";
@@ -837,6 +838,10 @@ static void machvirt_init(MachineState *machine)
         }
         cpuobj = object_new(object_class_get_name(oc));
 
+        if (!as) {
+            as = CPU(cpuobj)->as;
+        }
+
         /* Handle any CPU options specified by the user */
         cc->parse_features(CPU(cpuobj), cpuopts, &err);
         g_free(cpuopts);
@@ -889,7 +894,7 @@ static void machvirt_init(MachineState *machine)
      */
     create_virtio_devices(vbi, pic);
 
-    create_fw_cfg(vbi);
+    create_fw_cfg(as, vbi);
     rom_set_fw(fw_cfg_find());
 
     guest_info->smp_cpus = smp_cpus;
-- 
2.4.3