Re: [PATCH v2 3/5] conf, qemu: enable NVDIMM support for ppc64

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On 3/23/20 3:46 PM, Michal Prívozník wrote:
On 11. 3. 2020 22:29, Daniel Henrique Barboza wrote:
Using the 'uuid' element for ppc64 NVDIMM memory added in the
previous patch, use it in qemuBuildMemoryDeviceStr() to pass
it over to QEMU.

Another ppc64 restriction is the necessity of a mem->labelsize,
given than ppc64 only support label-area backed NVDIMMs.

Finally, we don't want ppc64 NVDIMMs to align up due to the
high risk of going beyond the end of file with a 256MiB
increment that the user didn't predict. Align it down
instead.

Signed-off-by: Daniel Henrique Barboza <danielhb413@xxxxxxxxx>
---
  src/conf/domain_conf.c                        |  7 +++
  src/qemu/qemu_command.c                       |  7 +++
  src/qemu/qemu_domain.c                        | 47 +++++++++++++++++--
  .../memory-hotplug-nvdimm-ppc64.args          | 32 +++++++++++++
  .../memory-hotplug-nvdimm-ppc64.xml           |  5 +-
  tests/qemuxml2argvtest.c                      |  4 ++
  .../memory-hotplug-nvdimm-ppc64.xml           |  5 +-
  7 files changed, 102 insertions(+), 5 deletions(-)
  create mode 100644 tests/qemuxml2argvdata/memory-hotplug-nvdimm-ppc64.args

diff --git a/src/conf/domain_conf.c b/src/conf/domain_conf.c
index 3ae6c181c2..7f8018fed2 100644
--- a/src/conf/domain_conf.c
+++ b/src/conf/domain_conf.c
@@ -16582,6 +16582,13 @@ virDomainMemoryDefParseXML(virDomainXMLOptionPtr xmlopt,
      if (virDomainMemoryTargetDefParseXML(node, ctxt, def) < 0)
          goto error;
+ if (def->model == VIR_DOMAIN_MEMORY_MODEL_NVDIMM &&
+        ARCH_IS_PPC64(dom->os.arch) && def->labelsize == 0) {
+        virReportError(VIR_ERR_XML_ERROR, "%s",
+                       _("label size is required for NVDIMM device"));
+        goto error;
+    }
+

I think this should go into virDomainMemoryDefValidate() instead,
because this is not strictly a parse error (e.g. like invalid UUID or
missing element).

The rest looks good. Can you please post a v3 of just this patch? I will
handle the review and merge. Sorry for delayed review.


No problem,. I'll send a v4 with this change (v3 is already in the ML with other
changes).


Thanks,


DHB



Michal







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