[RFC PATCH 08/12] qemu: add support for memory devices

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Add support to start qemu instance with 'pc-dimm' device. Thanks to the
refactors we are able to reuse the existing function to determine the
parameters.
---
 src/qemu/qemu_command.c | 114 ++++++++++++++++++++++++++++++++++++++++++++++++
 src/qemu/qemu_domain.c  |  18 ++++++--
 src/qemu/qemu_domain.h  |   2 +
 tests/qemuxml2xmltest.c |   1 +
 4 files changed, 132 insertions(+), 3 deletions(-)

diff --git a/src/qemu/qemu_command.c b/src/qemu/qemu_command.c
index 5820fb5..7c31723 100644
--- a/src/qemu/qemu_command.c
+++ b/src/qemu/qemu_command.c
@@ -1156,6 +1156,10 @@ qemuAssignDeviceAliases(virDomainDefPtr def, virQEMUCapsPtr qemuCaps)
         if (virAsprintf(&def->tpm->info.alias, "tpm%d", 0) < 0)
             return -1;
     }
+    for (i = 0; i < def->nmems; i++) {
+        if (virAsprintf(&def->mems[i]->info.alias, "dimm%zu", i) < 0)
+            return -1;
+    }

     return 0;
 }
@@ -4748,6 +4752,97 @@ qemuBuildMemoryCellBackendStr(virDomainDefPtr def,
 }


+static char *
+qemuBuildMemoryDimmBackendStr(virDomainMemoryDefPtr mem,
+                              virDomainDefPtr def,
+                              virQEMUCapsPtr qemuCaps,
+                              virQEMUDriverConfigPtr cfg)
+{
+    virJSONValuePtr props = NULL;
+    char *alias = NULL;
+    const char *backendType;
+    char *ret = NULL;
+
+    if (!mem->info.alias) {
+        virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
+                       _("memory device alias is not assigned"));
+        return NULL;
+    }
+
+    if (virAsprintf(&alias, "mem%s", mem->info.alias) < 0)
+        goto cleanup;
+
+    qemuDomainMemoryDeviceAlignSize(mem);
+
+    if (qemuBuildMemoryBackendStr(mem->size, mem->pagesize,
+                                  mem->targetNode, mem->sourceNodes, NULL,
+                                  def, qemuCaps, cfg,
+                                  &backendType, &props, true) < 0)
+        goto cleanup;
+
+    ret = qemuBuildObjectCommandlineFromJSON(backendType, alias, props);
+
+ cleanup:
+    VIR_FREE(alias);
+    virJSONValueFree(props);
+
+    return ret;
+}
+
+
+static char *
+qemuBuildMemoryDeviceStr(virDomainMemoryDefPtr mem,
+                         virQEMUCapsPtr qemuCaps)
+{
+    virBuffer buf = VIR_BUFFER_INITIALIZER;
+
+    if (!mem->info.alias) {
+        virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
+                       _("missing alias for memory device"));
+        return NULL;
+    }
+
+    switch ((virDomainMemoryModel) mem->model) {
+    case VIR_DOMAIN_MEMORY_MODEL_ACPI_DIMM:
+        if (!virQEMUCapsGet(qemuCaps, QEMU_CAPS_DEVICE_PC_DIMM)) {
+            virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
+                           _("this qemu doesn't support the pc-dimm device"));
+            return NULL;
+        }
+
+        if (mem->info.type != VIR_DOMAIN_DEVICE_ADDRESS_TYPE_ACPI_DIMM &&
+            mem->info.type != VIR_DOMAIN_DEVICE_ADDRESS_TYPE_NONE) {
+            virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
+                           _("only 'acpi-dimm' addresses are supported for the "
+                             "pc-dimm device"));
+            return NULL;
+        }
+
+        virBufferAsprintf(&buf, "pc-dimm,node=%d,memdev=mem%s,id=%s",
+                          mem->targetNode, mem->info.alias, mem->info.alias);
+
+        if (mem->info.type == VIR_DOMAIN_DEVICE_ADDRESS_TYPE_ACPI_DIMM) {
+            virBufferAsprintf(&buf, ",slot=%d", mem->info.addr.acpiDimm.slot);
+            virBufferAsprintf(&buf, ",base=%llu", mem->info.addr.acpiDimm.base);
+        }
+
+        break;
+
+    case VIR_DOMAIN_MEMORY_MODEL_NONE:
+    case VIR_DOMAIN_MEMORY_MODEL_LAST:
+        virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
+                       _("invalid memory device type"));
+        break;
+
+    }
+
+    if (virBufferCheckError(&buf) < 0)
+        return NULL;
+
+    return virBufferContentAndReset(&buf);
+}
+
+
 char *
 qemuBuildNicStr(virDomainNetDefPtr net,
                 const char *prefix,
@@ -8351,6 +8446,25 @@ qemuBuildCommandLine(virConnectPtr conn,
         if (qemuBuildNumaArgStr(cfg, def, cmd, qemuCaps, nodeset) < 0)
             goto error;

+    for (i = 0; i < def->nmems; i++) {
+        char *backStr;
+        char *dimmStr;
+
+        if (!(backStr = qemuBuildMemoryDimmBackendStr(def->mems[i], def,
+                                                      qemuCaps, cfg)))
+            goto error;
+
+        if (!(dimmStr = qemuBuildMemoryDeviceStr(def->mems[i], qemuCaps))) {
+            VIR_FREE(backStr);
+            goto error;
+        }
+
+        virCommandAddArgList(cmd, "-object", backStr, "-device", dimmStr, NULL);
+
+        VIR_FREE(backStr);
+        VIR_FREE(dimmStr);
+    }
+
     if (virQEMUCapsGet(qemuCaps, QEMU_CAPS_UUID))
         virCommandAddArgList(cmd, "-uuid", uuid, NULL);
     if (def->virtType == VIR_DOMAIN_VIRT_XEN ||
diff --git a/src/qemu/qemu_domain.c b/src/qemu/qemu_domain.c
index df912a6..ff03bdc 100644
--- a/src/qemu/qemu_domain.c
+++ b/src/qemu/qemu_domain.c
@@ -1182,9 +1182,6 @@ qemuDomainDeviceDefPostParse(virDomainDeviceDefPtr dev,
         }
     }

-    if (virDomainDeviceDefCheckUnsupportedMemoryDevice(dev) < 0)
-        goto cleanup;
-
     ret = 0;

  cleanup:
@@ -2878,3 +2875,18 @@ qemuDomObjEndAPI(virDomainObjPtr *vm)
     virObjectUnref(*vm);
     *vm = NULL;
 }
+
+
+/**
+ * qemuDomainMemoryDeviceAlignSize:
+ * @mem: memory device definition object
+ *
+ * Aligns the size of the memory module as qemu enforces it. The size is updated
+ * inplace. Default rounding is now to 1 MiB (qemu requires rouding to page,
+ * size so this should be safe).
+ */
+void
+qemuDomainMemoryDeviceAlignSize(virDomainMemoryDefPtr mem)
+{
+    mem->size = VIR_DIV_UP(mem->size, 1024) * 1024;
+}
diff --git a/src/qemu/qemu_domain.h b/src/qemu/qemu_domain.h
index 8caec2a..f56aec7 100644
--- a/src/qemu/qemu_domain.h
+++ b/src/qemu/qemu_domain.h
@@ -418,4 +418,6 @@ int qemuDomainJobInfoToParams(qemuDomainJobInfoPtr jobInfo,

 void qemuDomObjEndAPI(virDomainObjPtr *vm);

+void qemuDomainMemoryDeviceAlignSize(virDomainMemoryDefPtr mem);
+
 #endif /* __QEMU_DOMAIN_H__ */
diff --git a/tests/qemuxml2xmltest.c b/tests/qemuxml2xmltest.c
index e840d63..f9e8010 100644
--- a/tests/qemuxml2xmltest.c
+++ b/tests/qemuxml2xmltest.c
@@ -420,6 +420,7 @@ mymain(void)

     DO_TEST("memory-hotplug");
     DO_TEST("memory-hotplug-nonuma");
+    DO_TEST("memory-hotplug-dimm");

     virObjectUnref(driver.caps);
     virObjectUnref(driver.xmlopt);
-- 
2.2.2

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