[PATCH v3 3/5] domain_conf.c: revert auto-alignment of pSeries NVDIMM in post parse
Daniel Henrique Barboza
danielhb413 at gmail.com
Fri Dec 4 01:05:27 UTC 2020
The code to align ppc64 NVDIMMs on post parse was introduced in
commit d3f3c2c97f9b. That commit failed to realize that we
can't align memory unconditionally. As of commit c7d7ba85a624
("qemu: command: Align memory sizes only on fresh starts"),
all memory alignment should be executed only when we're not
migrating or in a snapshot.
This revert does not break any guests in the wild, given that
ppc64 NVDIMMs are still being aligned in qemuDomainAlignMemorySizes().
Next patch will introduce a mechanism where we can have post
parse NVDIMM alignment for pSeries without breaking the
intended design, as defined by c7d7ba85a624.
Commit d3f3c2c97f9b was predecessed by a move/rename of the former
qemuDomainNVDimmAlignSizePseries() function, commit ace5931553c8.
Reverting d3f3c2c97f9b will make the function rename obsolete since all
callers will now reside in QEMU drivers files, and it will remain that
way in the next patches, so let's revert ace5931553c8 as well.
This reverts commit d3f3c2c97f9b92c982ff809479495f44614edb88
(domain_conf.c: auto-align pSeries NVDIMM in virDomainMemoryDefPostParse()).
This reverts commit ace5931553c87beebb6b3cd994061742b3f88238
(conf, qemu: move qemuDomainNVDimmAlignSizePseries to domain_conf.c).
Reviewed-by: Michal Privoznik <mprivozn at redhat.com>
Signed-off-by: Daniel Henrique Barboza <danielhb413 at gmail.com>
---
src/conf/domain_conf.c | 59 +------------------
src/conf/domain_conf.h | 3 -
src/libvirt_private.syms | 1 -
src/qemu/qemu_domain.c | 42 ++++++++++++-
.../memory-hotplug-nvdimm-ppc64.xml | 2 +-
5 files changed, 42 insertions(+), 65 deletions(-)
diff --git a/src/conf/domain_conf.c b/src/conf/domain_conf.c
index 425e3c3710..d069a3ecc2 100644
--- a/src/conf/domain_conf.c
+++ b/src/conf/domain_conf.c
@@ -5359,24 +5359,6 @@ virDomainVsockDefPostParse(virDomainVsockDefPtr vsock)
}
-static int
-virDomainMemoryDefPostParse(virDomainMemoryDefPtr mem,
- const virDomainDef *def)
-{
- /* Although only the QEMU driver implements PPC64 support, this
- * code is related to the platform specification (PAPR), i.e. it
- * is hypervisor agnostic, and any future PPC64 hypervisor driver
- * will have the same restriction.
- */
- if (ARCH_IS_PPC64(def->os.arch) &&
- mem->model == VIR_DOMAIN_MEMORY_MODEL_NVDIMM &&
- virDomainNVDimmAlignSizePseries(mem) < 0)
- return -1;
-
- return 0;
-}
-
-
static int
virDomainDeviceDefPostParseCommon(virDomainDeviceDefPtr dev,
const virDomainDef *def,
@@ -5422,10 +5404,6 @@ virDomainDeviceDefPostParseCommon(virDomainDeviceDefPtr dev,
ret = 0;
break;
- case VIR_DOMAIN_DEVICE_MEMORY:
- ret = virDomainMemoryDefPostParse(dev->data.memory, def);
- break;
-
case VIR_DOMAIN_DEVICE_LEASE:
case VIR_DOMAIN_DEVICE_FS:
case VIR_DOMAIN_DEVICE_INPUT:
@@ -5440,6 +5418,7 @@ virDomainDeviceDefPostParseCommon(virDomainDeviceDefPtr dev,
case VIR_DOMAIN_DEVICE_SHMEM:
case VIR_DOMAIN_DEVICE_TPM:
case VIR_DOMAIN_DEVICE_PANIC:
+ case VIR_DOMAIN_DEVICE_MEMORY:
case VIR_DOMAIN_DEVICE_IOMMU:
case VIR_DOMAIN_DEVICE_AUDIO:
ret = 0;
@@ -16836,42 +16815,6 @@ virDomainSEVDefParseXML(xmlNodePtr sevNode,
return NULL;
}
-int
-virDomainNVDimmAlignSizePseries(virDomainMemoryDefPtr mem)
-{
- /* For NVDIMMs in ppc64 in we want to align down the guest
- * visible space, instead of align up, to avoid writing
- * beyond the end of file by adding a potential 256MiB
- * to the user specified size.
- *
- * The label-size is mandatory for ppc64 as well, meaning that
- * the guest visible space will be target_size-label_size.
- *
- * Finally, target_size must include label_size.
- *
- * The above can be summed up as follows:
- *
- * target_size = AlignDown(target_size - label_size) + label_size
- */
- unsigned long long ppc64AlignSize = 256 * 1024;
- unsigned long long guestArea = mem->size - mem->labelsize;
-
- /* Align down guest_area. 256MiB is the minimum size. Error
- * out if target_size is smaller than 256MiB + label_size,
- * since aligning it up will cause QEMU errors. */
- if (mem->size < (ppc64AlignSize + mem->labelsize)) {
- virReportError(VIR_ERR_XML_ERROR, "%s",
- _("minimum target size for the NVDIMM "
- "must be 256MB plus the label size"));
- return -1;
- }
-
- guestArea = (guestArea/ppc64AlignSize) * ppc64AlignSize;
- mem->size = guestArea + mem->labelsize;
-
- return 0;
-}
-
static virDomainMemoryDefPtr
virDomainMemoryDefParseXML(virDomainXMLOptionPtr xmlopt,
xmlNodePtr memdevNode,
diff --git a/src/conf/domain_conf.h b/src/conf/domain_conf.h
index 34cde22965..b1571d423c 100644
--- a/src/conf/domain_conf.h
+++ b/src/conf/domain_conf.h
@@ -3912,9 +3912,6 @@ bool
virDomainBlockIoTuneInfoEqual(const virDomainBlockIoTuneInfo *a,
const virDomainBlockIoTuneInfo *b);
-int
-virDomainNVDimmAlignSizePseries(virDomainMemoryDefPtr mem);
-
bool
virHostdevIsSCSIDevice(const virDomainHostdevDef *hostdev)
ATTRIBUTE_NONNULL(1);
diff --git a/src/libvirt_private.syms b/src/libvirt_private.syms
index 2f640ef1c4..5cf39bdf6c 100644
--- a/src/libvirt_private.syms
+++ b/src/libvirt_private.syms
@@ -546,7 +546,6 @@ virDomainNetTypeToString;
virDomainNetUpdate;
virDomainNostateReasonTypeFromString;
virDomainNostateReasonTypeToString;
-virDomainNVDimmAlignSizePseries;
virDomainObjAssignDef;
virDomainObjBroadcast;
virDomainObjCheckActive;
diff --git a/src/qemu/qemu_domain.c b/src/qemu/qemu_domain.c
index 663c0af867..af3c0e269a 100644
--- a/src/qemu/qemu_domain.c
+++ b/src/qemu/qemu_domain.c
@@ -8044,6 +8044,44 @@ qemuDomainGetMemoryModuleSizeAlignment(const virDomainDef *def,
}
+static int
+qemuDomainNVDimmAlignSizePseries(virDomainDefPtr def,
+ virDomainMemoryDefPtr mem)
+{
+ /* For NVDIMMs in ppc64 in we want to align down the guest
+ * visible space, instead of align up, to avoid writing
+ * beyond the end of file by adding a potential 256MiB
+ * to the user specified size.
+ *
+ * The label-size is mandatory for ppc64 as well, meaning that
+ * the guest visible space will be target_size-label_size.
+ *
+ * Finally, target_size must include label_size.
+ *
+ * The above can be summed up as follows:
+ *
+ * target_size = AlignDown(target_size - label_size) + label_size
+ */
+ unsigned long long ppc64AlignSize = qemuDomainGetMemorySizeAlignment(def);
+ unsigned long long guestArea = mem->size - mem->labelsize;
+
+ /* Align down guest_area. 256MiB is the minimum size. Error
+ * out if target_size is smaller than 256MiB + label_size,
+ * since aligning it up will cause QEMU errors. */
+ if (mem->size < (ppc64AlignSize + mem->labelsize)) {
+ virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
+ _("minimum target size for the NVDIMM "
+ "must be 256MB plus the label size"));
+ return -1;
+ }
+
+ guestArea = (guestArea/ppc64AlignSize) * ppc64AlignSize;
+ mem->size = guestArea + mem->labelsize;
+
+ return 0;
+}
+
+
int
qemuDomainAlignMemorySizes(virDomainDefPtr def)
{
@@ -8092,7 +8130,7 @@ qemuDomainAlignMemorySizes(virDomainDefPtr def)
for (i = 0; i < def->nmems; i++) {
if (def->mems[i]->model == VIR_DOMAIN_MEMORY_MODEL_NVDIMM &&
ARCH_IS_PPC64(def->os.arch)) {
- if (virDomainNVDimmAlignSizePseries(def->mems[i]) < 0)
+ if (qemuDomainNVDimmAlignSizePseries(def, def->mems[i]) < 0)
return -1;
} else {
align = qemuDomainGetMemoryModuleSizeAlignment(def, def->mems[i]);
@@ -8129,7 +8167,7 @@ qemuDomainMemoryDeviceAlignSize(virDomainDefPtr def,
{
if (mem->model == VIR_DOMAIN_MEMORY_MODEL_NVDIMM &&
ARCH_IS_PPC64(def->os.arch)) {
- return virDomainNVDimmAlignSizePseries(mem);
+ return qemuDomainNVDimmAlignSizePseries(def, mem);
} else {
mem->size = VIR_ROUND_UP(mem->size,
qemuDomainGetMemorySizeAlignment(def));
diff --git a/tests/qemuxml2xmloutdata/memory-hotplug-nvdimm-ppc64.xml b/tests/qemuxml2xmloutdata/memory-hotplug-nvdimm-ppc64.xml
index 0c0b9f96fb..bf7df9a259 100644
--- a/tests/qemuxml2xmloutdata/memory-hotplug-nvdimm-ppc64.xml
+++ b/tests/qemuxml2xmloutdata/memory-hotplug-nvdimm-ppc64.xml
@@ -34,7 +34,7 @@
<path>/tmp/nvdimm</path>
</source>
<target>
- <size unit='KiB'>524416</size>
+ <size unit='KiB'>550000</size>
<node>0</node>
<label>
<size unit='KiB'>128</size>
--
2.26.2
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