[Qemu-devel] [RFC QEMU PATCH 3/8] nvdimm acpi: do not use fw_cfg on Xen

[Haozhong Zhang]

No fw_cfg is created when QEMU is used as the device model of Xen.

Signed-off-by: Haozhong Zhang <address@hidden>
---
Cc: Xiao Guangrong <address@hidden>
Cc: "Michael S. Tsirkin" <address@hidden>
Cc: Igor Mammedov <address@hidden>
---
 hw/acpi/nvdimm.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/hw/acpi/nvdimm.c b/hw/acpi/nvdimm.c
index e486128..c9c2a84 100644
--- a/hw/acpi/nvdimm.c
+++ b/hw/acpi/nvdimm.c
@@ -770,8 +770,11 @@ void nvdimm_init_acpi_state(AcpiNVDIMMState *state, 
MemoryRegion *io,
 
     state->dsm_mem = g_array_new(false, true /* clear */, 1);
     acpi_data_push(state->dsm_mem, sizeof(NvdimmDsmIn));
-    fw_cfg_add_file(fw_cfg, NVDIMM_DSM_MEM_FILE, state->dsm_mem->data,
-                    state->dsm_mem->len);
+    /* No fw_cfg is used when running on Xen */
+    if (fw_cfg) {
+        fw_cfg_add_file(fw_cfg, NVDIMM_DSM_MEM_FILE, state->dsm_mem->data,
+                        state->dsm_mem->len);
+    }
 }
 
 #define NVDIMM_COMMON_DSM      "NCAL"
-- 
2.10.1