On 18/10/22 17:25, Julia Suvorova wrote:
In the ACPI specification [1], the 'unarmed' bit is set when a device
cannot accept a persistent write. This means that when a memdev is
read-only, the 'unarmed' flag must be turned on. The logic is correct,
just changing the error message.

[1] ACPI NFIT NVDIMM Region Mapping Structure "NVDIMM State Flags" Bit 3


Fixes: dbd730e859 ("nvdimm: check -object memory-backend-file, readonly=on option")

The documentation in 'docs/nvdimm.txt' is correct :)

Signed-off-by: Julia Suvorova <jus...@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefa...@redhat.com>
---
  hw/mem/nvdimm.c | 2 +-
  1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/hw/mem/nvdimm.c b/hw/mem/nvdimm.c
index 7c7d777781..bfb76818c1 100644
--- a/hw/mem/nvdimm.c
+++ b/hw/mem/nvdimm.c
@@ -149,7 +149,7 @@ static void nvdimm_prepare_memory_region(NVDIMMDevice 
*nvdimm, Error **errp)
      if (!nvdimm->unarmed && memory_region_is_rom(mr)) {
          HostMemoryBackend *hostmem = dimm->hostmem;
- error_setg(errp, "'unarmed' property must be off since memdev %s "
+        error_setg(errp, "'unarmed' property must be on since memdev %s "

If you ever respin please quote 'on' for readability.

                     "is read-only",
                     object_get_canonical_path_component(OBJECT(hostmem)));
          return;

Reviewed-by: Philippe Mathieu-Daudé <phi...@linaro.org>

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