10:17 a.m.
There was a mess in the way how we store unlimited value for memory
limits and how we handled values provided by user. Internally there
were two possible ways how to store unlimited value: as 0 value or as
VIR_DOMAIN_MEMORY_PARAM_UNLIMITED. Because we chose to store memory
limits as unsigned long long, we cannot use -1 to represent unlimited.
It's much easier for us to say that everything greater than
VIR_DOMAIN_MEMORY_PARAM_UNLIMITED means unlimited and leave 0 as valid
value despite that it makes no sense to set limit to 0.
Resolves: https://bugzilla.redhat.com/show_bug.cgi?id=1146539
Signed-off-by: Pavel Hrdina <phrdina(a)redhat.com>
---
docs/formatdomain.html.in | 4 +-
src/conf/domain_conf.c | 75 +++++++++++++++++-----
src/libvirt-domain.c | 3 +
src/lxc/lxc_cgroup.c | 18 +++---
src/lxc/lxc_driver.c | 3 -
src/lxc/lxc_fuse.c | 12 ++--
src/lxc/lxc_native.c | 6 +-
src/openvz/openvz_conf.c | 4 +-
src/openvz/openvz_driver.c | 4 +-
src/qemu/qemu_cgroup.c | 24 +++----
src/qemu/qemu_command.c | 8 ++-
src/qemu/qemu_driver.c | 6 +-
src/qemu/qemu_hotplug.c | 2 +-
src/qemu/qemu_migration.c | 5 +-
src/util/virutil.c | 8 +--
tests/qemuxml2argvdata/qemuxml2argv-memtune.xml | 2 +-
.../qemuxml2xmloutdata/qemuxml2xmlout-memtune.xml | 2 +-
17 files changed, 116 insertions(+), 70 deletions(-)
diff --git a/docs/formatdomain.html.in b/docs/formatdomain.html.in
index 6276a61..335763f 100644
--- a/docs/formatdomain.html.in
+++ b/docs/formatdomain.html.in
@@ -798,7 +798,9 @@
for <code><memory></code>. For backwards
compatibility, output is always in
KiB. <span class='since'><code>unit</code>
- since 0.9.11</span></dd>
+ since 0.9.11</span>
+ Possible values for all *_limit parameters are in range from 0 to
+ VIR_DOMAIN_MEMORY_PARAM_UNLIMITED.</dd>
<dt><code>hard_limit</code></dt>
<dd> The optional <code>hard_limit</code> element is the maximum
memory
the guest can use. The units for this value are kibibytes (i.e. blocks
diff --git a/src/conf/domain_conf.c b/src/conf/domain_conf.c
index 6da02b0..cde9ba1 100644
--- a/src/conf/domain_conf.c
+++ b/src/conf/domain_conf.c
@@ -2320,6 +2320,10 @@ virDomainDefNew(void)
if (!(ret->numa = virDomainNumaNew()))
goto error;
+ ret->mem.hard_limit = VIR_DOMAIN_MEMORY_PARAM_UNLIMITED;
+ ret->mem.soft_limit = VIR_DOMAIN_MEMORY_PARAM_UNLIMITED;
+ ret->mem.swap_hard_limit = VIR_DOMAIN_MEMORY_PARAM_UNLIMITED;
+
return ret;
error:
@@ -6884,6 +6888,50 @@ virDomainParseMemory(const char *xpath,
}
+/**
+ * virDomainParseMemoryLimit:
+ *
+ * @xpath: XPath to memory amount
+ * @units_xpath: XPath to units attribute
+ * @ctxt: XPath context
+ * @mem: scaled memory amount is stored here
+ *
+ * Parse a memory element or attribute located at @xpath within @ctxt, and
+ * store the result into @mem, in blocks of 1024. The value is scaled by
+ * units located at @units_xpath (or the 'unit' attribute under @xpath if
+ * @units_xpath is NULL). If units are not present, he default scale of 1024
+ * is used. The value must not exceed VIR_DOMAIN_MEMORY_PARAM_UNLIMITED
+ * once scaled.
+ *
+ * This helper should be used only on *_limit memory elements.
+ *
+ * Return 0 on success, -1 on failure after issuing error.
+ */
+static int
+virDomainParseMemoryLimit(const char *xpath,
+ const char *units_xpath,
+ xmlXPathContextPtr ctxt,
+ unsigned long long *mem)
+{
+ int ret;
+ unsigned long long bytes;
+
+ ret = virDomainParseScaledValue(xpath, units_xpath, ctxt, &bytes, 1024,
+ VIR_DOMAIN_MEMORY_PARAM_UNLIMITED << 10,
+ false);
+
+ if (ret < 0)
+ return -1;
+
+ if (ret == 0)
+ *mem = VIR_DOMAIN_MEMORY_PARAM_UNLIMITED;
+ else
+ VIR_SET_MEMORY_LIMIT(*mem, VIR_DIV_UP(bytes, 1024));
+
+ return 0;
+}
+
+
static int
virDomainControllerModelTypeFromString(const virDomainControllerDef *def,
const char *model)
@@ -13185,20 +13233,20 @@ virDomainDefParseXML(xmlDocPtr xml,
VIR_FREE(nodes);
/* Extract other memory tunables */
- if (virDomainParseMemory("./memtune/hard_limit[1]", NULL, ctxt,
- &def->mem.hard_limit, false, false) < 0)
+ if (virDomainParseMemoryLimit("./memtune/hard_limit[1]", NULL, ctxt,
+ &def->mem.hard_limit) < 0)
goto error;
- if (virDomainParseMemory("./memtune/soft_limit[1]", NULL, ctxt,
- &def->mem.soft_limit, false, false) < 0)
+ if (virDomainParseMemoryLimit("./memtune/soft_limit[1]", NULL, ctxt,
+ &def->mem.soft_limit) < 0)
goto error;
if (virDomainParseMemory("./memtune/min_guarantee[1]", NULL, ctxt,
&def->mem.min_guarantee, false, false) < 0)
goto error;
- if (virDomainParseMemory("./memtune/swap_hard_limit[1]", NULL, ctxt,
- &def->mem.swap_hard_limit, false, false) < 0)
+ if (virDomainParseMemoryLimit("./memtune/swap_hard_limit[1]", NULL, ctxt,
+ &def->mem.swap_hard_limit) < 0)
goto error;
n = virXPathULong("string(./vcpu[1])", ctxt, &count);
@@ -19767,20 +19815,17 @@ virDomainDefFormatInternal(virDomainDefPtr def,
}
/* add memtune only if there are any */
- if ((def->mem.hard_limit &&
- def->mem.hard_limit != VIR_DOMAIN_MEMORY_PARAM_UNLIMITED) ||
- (def->mem.soft_limit &&
- def->mem.soft_limit != VIR_DOMAIN_MEMORY_PARAM_UNLIMITED) ||
- (def->mem.swap_hard_limit &&
- def->mem.swap_hard_limit != VIR_DOMAIN_MEMORY_PARAM_UNLIMITED) ||
+ if (def->mem.hard_limit < VIR_DOMAIN_MEMORY_PARAM_UNLIMITED ||
+ def->mem.soft_limit < VIR_DOMAIN_MEMORY_PARAM_UNLIMITED ||
+ def->mem.swap_hard_limit < VIR_DOMAIN_MEMORY_PARAM_UNLIMITED ||
def->mem.min_guarantee) {
virBufferAddLit(buf, "<memtune>\n");
virBufferAdjustIndent(buf, 2);
- if (def->mem.hard_limit) {
+ if (def->mem.hard_limit < VIR_DOMAIN_MEMORY_PARAM_UNLIMITED) {
virBufferAsprintf(buf, "<hard_limit unit='KiB'>"
"%llu</hard_limit>\n",
def->mem.hard_limit);
}
- if (def->mem.soft_limit) {
+ if (def->mem.soft_limit < VIR_DOMAIN_MEMORY_PARAM_UNLIMITED) {
virBufferAsprintf(buf, "<soft_limit unit='KiB'>"
"%llu</soft_limit>\n",
def->mem.soft_limit);
}
@@ -19788,7 +19833,7 @@ virDomainDefFormatInternal(virDomainDefPtr def,
virBufferAsprintf(buf, "<min_guarantee unit='KiB'>"
"%llu</min_guarantee>\n",
def->mem.min_guarantee);
}
- if (def->mem.swap_hard_limit) {
+ if (def->mem.swap_hard_limit < VIR_DOMAIN_MEMORY_PARAM_UNLIMITED) {
virBufferAsprintf(buf, "<swap_hard_limit
unit='KiB'>"
"%llu</swap_hard_limit>\n",
def->mem.swap_hard_limit);
}
diff --git a/src/libvirt-domain.c b/src/libvirt-domain.c
index 89d1eab..8345397 100644
--- a/src/libvirt-domain.c
+++ b/src/libvirt-domain.c
@@ -2075,6 +2075,9 @@ virDomainSetMemoryStatsPeriod(virDomainPtr domain, int period,
* Change all or a subset of the memory tunables.
* This function may require privileged access to the hypervisor.
*
+ * Possible values for all *_limit memory tunables are in range from 0 to
+ * VIR_DOMAIN_MEMORY_PARAM_UNLIMITED.
+ *
* Returns -1 in case of error, 0 in case of success.
*/
int
diff --git a/src/lxc/lxc_cgroup.c b/src/lxc/lxc_cgroup.c
index 8e46a01..f384ab3 100644
--- a/src/lxc/lxc_cgroup.c
+++ b/src/lxc/lxc_cgroup.c
@@ -149,17 +149,17 @@ static int virLXCCgroupSetupMemTune(virDomainDefPtr def,
if (virCgroupSetMemory(cgroup, def->mem.max_balloon) < 0)
goto cleanup;
- if (def->mem.hard_limit &&
- virCgroupSetMemoryHardLimit(cgroup, def->mem.hard_limit) < 0)
- goto cleanup;
+ if (def->mem.hard_limit < VIR_DOMAIN_MEMORY_PARAM_UNLIMITED)
+ if (virCgroupSetMemoryHardLimit(cgroup, def->mem.hard_limit) < 0)
+ goto cleanup;
- if (def->mem.soft_limit &&
- virCgroupSetMemorySoftLimit(cgroup, def->mem.soft_limit) < 0)
- goto cleanup;
+ if (def->mem.soft_limit < VIR_DOMAIN_MEMORY_PARAM_UNLIMITED)
+ if (virCgroupSetMemorySoftLimit(cgroup, def->mem.soft_limit) < 0)
+ goto cleanup;
- if (def->mem.swap_hard_limit &&
- virCgroupSetMemSwapHardLimit(cgroup, def->mem.swap_hard_limit) < 0)
- goto cleanup;
+ if (def->mem.swap_hard_limit < VIR_DOMAIN_MEMORY_PARAM_UNLIMITED)
+ if (virCgroupSetMemSwapHardLimit(cgroup, def->mem.swap_hard_limit) < 0)
+ goto cleanup;
ret = 0;
cleanup:
diff --git a/src/lxc/lxc_driver.c b/src/lxc/lxc_driver.c
index 3a28dd5..8f60e1a 100644
--- a/src/lxc/lxc_driver.c
+++ b/src/lxc/lxc_driver.c
@@ -983,7 +983,6 @@ lxcDomainGetMemoryParameters(virDomainPtr dom,
case 0: /* fill memory hard limit here */
if (flags & VIR_DOMAIN_AFFECT_CONFIG) {
val = vmdef->mem.hard_limit;
- val = val ? val : VIR_DOMAIN_MEMORY_PARAM_UNLIMITED;
} else if (virCgroupGetMemoryHardLimit(priv->cgroup, &val) < 0) {
goto cleanup;
}
@@ -994,7 +993,6 @@ lxcDomainGetMemoryParameters(virDomainPtr dom,
case 1: /* fill memory soft limit here */
if (flags & VIR_DOMAIN_AFFECT_CONFIG) {
val = vmdef->mem.soft_limit;
- val = val ? val : VIR_DOMAIN_MEMORY_PARAM_UNLIMITED;
} else if (virCgroupGetMemorySoftLimit(priv->cgroup, &val) < 0) {
goto cleanup;
}
@@ -1005,7 +1003,6 @@ lxcDomainGetMemoryParameters(virDomainPtr dom,
case 2: /* fill swap hard limit here */
if (flags & VIR_DOMAIN_AFFECT_CONFIG) {
val = vmdef->mem.swap_hard_limit;
- val = val ? val : VIR_DOMAIN_MEMORY_PARAM_UNLIMITED;
} else if (virCgroupGetMemSwapHardLimit(priv->cgroup, &val) < 0) {
goto cleanup;
}
diff --git a/src/lxc/lxc_fuse.c b/src/lxc/lxc_fuse.c
index 5c18cff..6c47f80 100644
--- a/src/lxc/lxc_fuse.c
+++ b/src/lxc/lxc_fuse.c
@@ -165,11 +165,13 @@ static int lxcProcReadMeminfo(char *hostpath, virDomainDefPtr def,
*ptr = '\0';
if (STREQ(line, "MemTotal") &&
- (def->mem.hard_limit || def->mem.max_balloon)) {
+ (def->mem.hard_limit < VIR_DOMAIN_MEMORY_PARAM_UNLIMITED ||
+ def->mem.max_balloon)) {
virBufferAsprintf(new_meminfo, "MemTotal: %8llu kB\n",
meminfo.memtotal);
} else if (STREQ(line, "MemFree") &&
- (def->mem.hard_limit || def->mem.max_balloon)) {
+ (def->mem.hard_limit < VIR_DOMAIN_MEMORY_PARAM_UNLIMITED ||
+ def->mem.max_balloon)) {
virBufferAsprintf(new_meminfo, "MemFree: %8llu kB\n",
(meminfo.memtotal - meminfo.memusage));
} else if (STREQ(line, "Buffers")) {
@@ -198,10 +200,12 @@ static int lxcProcReadMeminfo(char *hostpath, virDomainDefPtr def,
} else if (STREQ(line, "Unevictable")) {
virBufferAsprintf(new_meminfo, "Unevictable: %8llu kB\n",
meminfo.unevictable);
- } else if (STREQ(line, "SwapTotal") &&
def->mem.swap_hard_limit) {
+ } else if (STREQ(line, "SwapTotal") &&
+ def->mem.swap_hard_limit <
VIR_DOMAIN_MEMORY_PARAM_UNLIMITED) {
virBufferAsprintf(new_meminfo, "SwapTotal: %8llu kB\n",
(meminfo.swaptotal - meminfo.memtotal));
- } else if (STREQ(line, "SwapFree") &&
def->mem.swap_hard_limit) {
+ } else if (STREQ(line, "SwapFree") &&
+ def->mem.swap_hard_limit <
VIR_DOMAIN_MEMORY_PARAM_UNLIMITED) {
virBufferAsprintf(new_meminfo, "SwapFree: %8llu kB\n",
(meminfo.swaptotal - meminfo.memtotal -
meminfo.swapusage + meminfo.memusage));
diff --git a/src/lxc/lxc_native.c b/src/lxc/lxc_native.c
index abf07ce..4fc25fb 100644
--- a/src/lxc/lxc_native.c
+++ b/src/lxc/lxc_native.c
@@ -773,7 +773,7 @@ lxcSetMemTune(virDomainDefPtr def, virConfPtr properties)
return -1;
size = size / 1024;
def->mem.max_balloon = size;
- def->mem.hard_limit = size;
+ VIR_SET_MEMORY_LIMIT(def->mem.hard_limit, size);
}
if ((value = virConfGetValue(properties,
@@ -782,7 +782,7 @@ lxcSetMemTune(virDomainDefPtr def, virConfPtr properties)
if (lxcConvertSize(value->str, &size) < 0)
return -1;
- def->mem.soft_limit = size / 1024;
+ VIR_SET_MEMORY_LIMIT(def->mem.soft_limit, size / 1024);
}
if ((value = virConfGetValue(properties,
@@ -791,7 +791,7 @@ lxcSetMemTune(virDomainDefPtr def, virConfPtr properties)
if (lxcConvertSize(value->str, &size) < 0)
return -1;
- def->mem.swap_hard_limit = size / 1024;
+ VIR_SET_MEMORY_LIMIT(def->mem.swap_hard_limit, size / 1024);
}
return 0;
}
diff --git a/src/openvz/openvz_conf.c b/src/openvz/openvz_conf.c
index 848e230..bfa2141 100644
--- a/src/openvz/openvz_conf.c
+++ b/src/openvz/openvz_conf.c
@@ -479,12 +479,12 @@ openvzReadMemConf(virDomainDefPtr def, int veid)
goto error;
}
if (barrier == LONG_MAX)
- def->mem.soft_limit = 0ull;
+ def->mem.soft_limit = VIR_DOMAIN_MEMORY_PARAM_UNLIMITED;
else
def->mem.soft_limit = barrier * kb_per_pages;
if (limit == LONG_MAX)
- def->mem.hard_limit = 0ull;
+ def->mem.hard_limit = VIR_DOMAIN_MEMORY_PARAM_UNLIMITED;
else
def->mem.hard_limit = limit * kb_per_pages;
}
diff --git a/src/openvz/openvz_driver.c b/src/openvz/openvz_driver.c
index 5a5cd8d..a55e6a6 100644
--- a/src/openvz/openvz_driver.c
+++ b/src/openvz/openvz_driver.c
@@ -1850,7 +1850,7 @@ openvzDomainGetMemoryParameters(virDomainPtr domain,
if (openvzDomainGetBarrierLimit(domain, name, &barrier, &limit) <
0)
goto cleanup;
- val = (limit == LONG_MAX) ? 0ull : limit * kb_per_pages;
+ val = (limit == LONG_MAX) ? VIR_DOMAIN_MEMORY_PARAM_UNLIMITED : limit *
kb_per_pages;
if (virTypedParameterAssign(param, VIR_DOMAIN_MEMORY_HARD_LIMIT,
VIR_TYPED_PARAM_ULLONG, val) < 0)
goto cleanup;
@@ -1861,7 +1861,7 @@ openvzDomainGetMemoryParameters(virDomainPtr domain,
if (openvzDomainGetBarrierLimit(domain, name, &barrier, &limit) <
0)
goto cleanup;
- val = (barrier == LONG_MAX) ? 0ull : barrier * kb_per_pages;
+ val = (barrier == LONG_MAX) ? VIR_DOMAIN_MEMORY_PARAM_UNLIMITED : barrier *
kb_per_pages;
if (virTypedParameterAssign(param, VIR_DOMAIN_MEMORY_SOFT_LIMIT,
VIR_TYPED_PARAM_ULLONG, val) < 0)
goto cleanup;
diff --git a/src/qemu/qemu_cgroup.c b/src/qemu/qemu_cgroup.c
index f8f0e3c..21a5a4d 100644
--- a/src/qemu/qemu_cgroup.c
+++ b/src/qemu/qemu_cgroup.c
@@ -471,9 +471,9 @@ qemuSetupMemoryCgroup(virDomainObjPtr vm)
qemuDomainObjPrivatePtr priv = vm->privateData;
if (!virCgroupHasController(priv->cgroup, VIR_CGROUP_CONTROLLER_MEMORY)) {
- if (vm->def->mem.hard_limit != 0 ||
- vm->def->mem.soft_limit != 0 ||
- vm->def->mem.swap_hard_limit != 0) {
+ if (vm->def->mem.hard_limit < VIR_DOMAIN_MEMORY_PARAM_UNLIMITED ||
+ vm->def->mem.soft_limit < VIR_DOMAIN_MEMORY_PARAM_UNLIMITED ||
+ vm->def->mem.swap_hard_limit < VIR_DOMAIN_MEMORY_PARAM_UNLIMITED) {
virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
_("Memory cgroup is not available on this host"));
return -1;
@@ -482,17 +482,17 @@ qemuSetupMemoryCgroup(virDomainObjPtr vm)
}
}
- if (vm->def->mem.hard_limit != 0 &&
- virCgroupSetMemoryHardLimit(priv->cgroup, vm->def->mem.hard_limit) <
0)
- return -1;
+ if (vm->def->mem.hard_limit < VIR_DOMAIN_MEMORY_PARAM_UNLIMITED)
+ if (virCgroupSetMemoryHardLimit(priv->cgroup, vm->def->mem.hard_limit)
< 0)
+ return -1;
- if (vm->def->mem.soft_limit != 0 &&
- virCgroupSetMemorySoftLimit(priv->cgroup, vm->def->mem.soft_limit) <
0)
- return -1;
+ if (vm->def->mem.soft_limit < VIR_DOMAIN_MEMORY_PARAM_UNLIMITED)
+ if (virCgroupSetMemorySoftLimit(priv->cgroup, vm->def->mem.soft_limit)
< 0)
+ return -1;
- if (vm->def->mem.swap_hard_limit != 0 &&
- virCgroupSetMemSwapHardLimit(priv->cgroup, vm->def->mem.swap_hard_limit)
< 0)
- return -1;
+ if (vm->def->mem.swap_hard_limit < VIR_DOMAIN_MEMORY_PARAM_UNLIMITED)
+ if (virCgroupSetMemSwapHardLimit(priv->cgroup,
vm->def->mem.swap_hard_limit) < 0)
+ return -1;
return 0;
}
diff --git a/src/qemu/qemu_command.c b/src/qemu/qemu_command.c
index c112619..a7f9329 100644
--- a/src/qemu/qemu_command.c
+++ b/src/qemu/qemu_command.c
@@ -8271,8 +8271,10 @@ qemuBuildCommandLine(virConnectPtr conn,
/* If we have no cgroups then we can have no tunings that
* require them */
- if (def->mem.hard_limit || def->mem.soft_limit ||
- def->mem.min_guarantee || def->mem.swap_hard_limit) {
+ if (def->mem.hard_limit < VIR_DOMAIN_MEMORY_PARAM_UNLIMITED ||
+ def->mem.soft_limit < VIR_DOMAIN_MEMORY_PARAM_UNLIMITED ||
+ def->mem.min_guarantee ||
+ def->mem.swap_hard_limit < VIR_DOMAIN_MEMORY_PARAM_UNLIMITED) {
virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
_("Memory tuning is not available in session
mode"));
goto error;
@@ -10356,7 +10358,7 @@ qemuBuildCommandLine(virConnectPtr conn,
* space just to be safe (some finer tuning might be
* nice, though).
*/
- memKB = def->mem.hard_limit ?
+ memKB = def->mem.hard_limit < VIR_DOMAIN_MEMORY_PARAM_UNLIMITED ?
def->mem.hard_limit : def->mem.max_balloon + 1024 * 1024;
virCommandSetMaxMemLock(cmd, memKB * 1024);
}
diff --git a/src/qemu/qemu_driver.c b/src/qemu/qemu_driver.c
index ffa4e19..d5f10ad 100644
--- a/src/qemu/qemu_driver.c
+++ b/src/qemu/qemu_driver.c
@@ -9143,8 +9143,7 @@ qemuDomainSetMemoryParameters(virDomainPtr dom,
#undef VIR_GET_LIMIT_PARAMETER
- /* Swap hard limit must be greater than hard limit.
- * Note that limit of 0 denotes unlimited */
+ /* Swap hard limit must be greater than hard limit. */
if (set_swap_hard_limit || set_hard_limit) {
unsigned long long mem_limit = vm->def->mem.hard_limit;
unsigned long long swap_limit = vm->def->mem.swap_hard_limit;
@@ -9279,7 +9278,6 @@ qemuDomainGetMemoryParameters(virDomainPtr dom,
switch (i) {
case 0: /* fill memory hard limit here */
value = persistentDef->mem.hard_limit;
- value = value ? value : VIR_DOMAIN_MEMORY_PARAM_UNLIMITED;
if (virTypedParameterAssign(param, VIR_DOMAIN_MEMORY_HARD_LIMIT,
VIR_TYPED_PARAM_ULLONG, value) < 0)
goto cleanup;
@@ -9287,7 +9285,6 @@ qemuDomainGetMemoryParameters(virDomainPtr dom,
case 1: /* fill memory soft limit here */
value = persistentDef->mem.soft_limit;
- value = value ? value : VIR_DOMAIN_MEMORY_PARAM_UNLIMITED;
if (virTypedParameterAssign(param, VIR_DOMAIN_MEMORY_SOFT_LIMIT,
VIR_TYPED_PARAM_ULLONG, value) < 0)
goto cleanup;
@@ -9295,7 +9292,6 @@ qemuDomainGetMemoryParameters(virDomainPtr dom,
case 2: /* fill swap hard limit here */
value = persistentDef->mem.swap_hard_limit;
- value = value ? value : VIR_DOMAIN_MEMORY_PARAM_UNLIMITED;
if (virTypedParameterAssign(param, VIR_DOMAIN_MEMORY_SWAP_HARD_LIMIT,
VIR_TYPED_PARAM_ULLONG, value) < 0)
goto cleanup;
diff --git a/src/qemu/qemu_hotplug.c b/src/qemu/qemu_hotplug.c
index 08047ce..af89ea9 100644
--- a/src/qemu/qemu_hotplug.c
+++ b/src/qemu/qemu_hotplug.c
@@ -1250,7 +1250,7 @@ qemuDomainAttachHostPCIDevice(virQEMUDriverPtr driver,
* Kibibytes, but virProcessSetMaxMemLock expects the value in
* bytes.
*/
- memKB = vm->def->mem.hard_limit
+ memKB = vm->def->mem.hard_limit < VIR_DOMAIN_MEMORY_PARAM_UNLIMITED
? vm->def->mem.hard_limit
: vm->def->mem.max_balloon + (1024 * 1024);
virProcessSetMaxMemLock(vm->pid, memKB * 1024);
diff --git a/src/qemu/qemu_migration.c b/src/qemu/qemu_migration.c
index 20e40aa..fbee7d3 100644
--- a/src/qemu/qemu_migration.c
+++ b/src/qemu/qemu_migration.c
@@ -2986,7 +2986,8 @@ qemuMigrationPrepareAny(virQEMUDriverPtr driver,
QEMU_MIGRATION_COOKIE_NBD)))
goto cleanup;
- if (STREQ_NULLABLE(protocol, "rdma") &&
!vm->def->mem.hard_limit) {
+ if (STREQ_NULLABLE(protocol, "rdma") &&
+ vm->def->mem.hard_limit < VIR_DOMAIN_MEMORY_PARAM_UNLIMITED) {
virReportError(VIR_ERR_OPERATION_INVALID, "%s",
_("cannot start RDMA migration with no memory hard "
"limit set"));
@@ -4102,7 +4103,7 @@ static int doNativeMigrate(virQEMUDriverPtr driver,
"with this QEMU binary"));
goto cleanup;
}
- if (!vm->def->mem.hard_limit) {
+ if (vm->def->mem.hard_limit < VIR_DOMAIN_MEMORY_PARAM_UNLIMITED) {
virReportError(VIR_ERR_OPERATION_INVALID, "%s",
_("cannot start RDMA migration with no memory hard
"
"limit set"));
diff --git a/src/util/virutil.c b/src/util/virutil.c
index 4a95292..02ad626 100644
--- a/src/util/virutil.c
+++ b/src/util/virutil.c
@@ -2367,8 +2367,7 @@ virFindFCHostCapableVport(const char *sysfs_prefix
ATTRIBUTE_UNUSED)
/**
* virCompareLimitUlong:
*
- * Compare two unsigned long long numbers. Value '0' of the arguments has a
- * special meaning of 'unlimited' and thus greater than any other value.
+ * Compare two unsigned long long numbers.
*
* Returns 0 if the numbers are equal, -1 if b is greater, 1 if a is greater.
*/
@@ -2378,10 +2377,7 @@ virCompareLimitUlong(unsigned long long a, unsigned long long b)
if (a == b)
return 0;
- if (!b)
- return -1;
-
- if (a == 0 || a > b)
+ if (a > b)
return 1;
return -1;
diff --git a/tests/qemuxml2argvdata/qemuxml2argv-memtune.xml
b/tests/qemuxml2argvdata/qemuxml2argv-memtune.xml
index 1a244f0..f838d95 100644
--- a/tests/qemuxml2argvdata/qemuxml2argv-memtune.xml
+++ b/tests/qemuxml2argvdata/qemuxml2argv-memtune.xml
@@ -5,7 +5,7 @@
<currentMemory unit='KiB'>219136</currentMemory>
<memtune>
<hard_limit unit='KiB'>512000</hard_limit>
- <soft_limit unit='bytes'>131071999</soft_limit>
+ <soft_limit unit='bytes'>0</soft_limit>
<swap_hard_limit unit='KB'>1048576</swap_hard_limit>
</memtune>
<vcpu placement='static'>1</vcpu>
diff --git a/tests/qemuxml2xmloutdata/qemuxml2xmlout-memtune.xml
b/tests/qemuxml2xmloutdata/qemuxml2xmlout-memtune.xml
index 92dcacf..07989d1 100644
--- a/tests/qemuxml2xmloutdata/qemuxml2xmlout-memtune.xml
+++ b/tests/qemuxml2xmloutdata/qemuxml2xmlout-memtune.xml
@@ -5,7 +5,7 @@
<currentMemory unit='KiB'>219136</currentMemory>
<memtune>
<hard_limit unit='KiB'>512000</hard_limit>
- <soft_limit unit='KiB'>128000</soft_limit>
+ <soft_limit unit='KiB'>0</soft_limit>
<swap_hard_limit unit='KiB'>1024000</swap_hard_limit>
</memtune>
<vcpu placement='static'>1</vcpu>
--
2.0.5