[RFC QEMU PATCH v2 01/10] nvdimm xen: disable label support on Xen

[Haozhong Zhang <haozhong.zhang@intel.com>]

If xen_enabled(), memory_region_get_ram_ptr() always returns NULL and
nvdimm_realize() cannot get the correct pointer to the label area. This
commit disables the label support for Xen accelerator to workaround
this issue.

Signed-off-by: Haozhong Zhang <haozhong.zhang@intel.com>
---
Cc: "Michael S. Tsirkin" <mst@redhat.com>
Cc: Igor Mammedov <imammedo@redhat.com>
Cc: Xiao Guangrong <guangrong.xiao@linux.intel.com>
---
 hw/mem/nvdimm.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/hw/mem/nvdimm.c b/hw/mem/nvdimm.c
index db896b0bb6..0d3e17e94c 100644
--- a/hw/mem/nvdimm.c
+++ b/hw/mem/nvdimm.c
@@ -87,7 +87,11 @@ static void nvdimm_realize(PCDIMMDevice *dimm, Error **errp)
     align = memory_region_get_alignment(mr);
 
     pmem_size = size - nvdimm->label_size;
-    nvdimm->label_data = memory_region_get_ram_ptr(mr) + pmem_size;
+    /*
+     * TODO: explain the reason
+     */
+    if (nvdimm->label_size)
+        nvdimm->label_data = memory_region_get_ram_ptr(mr) + pmem_size;
     pmem_size = QEMU_ALIGN_DOWN(pmem_size, align);
 
     if (size <= nvdimm->label_size || !pmem_size) {
-- 
2.12.0


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