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conf: Validate virDomainMemoryDef::targetNode

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Almost all of memory models we currently support allow setting
virDomainMemoryDef::targetNode so that the memory module is
associated with given guest NUMA node. And we do have a check
whether the requested node is within bounds, but it's executed
only when building QEMU's cmd line. Move it into validation
phase.

While this commit is moving the validation to a place that does
not validate all the possible code paths, it's okay, because only
the explicit memory device has user-configurable target node
which could break the assumption.

Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
Reviewed-by: Peter Krempa <pkrempa@redhat.com>
This commit is contained in:
Michal Privoznik 2022-07-26 19:27:06 +02:00
parent 303636e7d0
commit f7baee531a
5 changed files with 57 additions and 9 deletions
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13
src/conf/domain_validate.c
View File

@ -2227,6 +2227,19 @@ virDomainMemoryDefValidate(const virDomainMemoryDef *mem,
{
unsigned long long thpSize;
/* Guest NUMA nodes are continuous and indexed from zero. */
if (mem->targetNode != -1) {
const size_t nodeCount = virDomainNumaGetNodeCount(def->numa);
if (mem->targetNode >= nodeCount) {
virReportError(VIR_ERR_XML_DETAIL,
_("can't add memory backend for guest node '%d' as the guest has only '%zu' NUMA nodes configured"),
mem->targetNode, nodeCount);
return -1;
}
}
switch (mem->model) {
case VIR_DOMAIN_MEMORY_MODEL_NVDIMM:
if (!mem->nvdimmPath) {

9
src/qemu/qemu_command.c
View File

@ -3695,15 +3695,6 @@ qemuBuildMemoryBackendProps(virJSONValue **backendProps,
*backendProps = NULL;
if (mem->targetNode >= 0) {
/* memory devices could provide a invalid guest node */
if (mem->targetNode >= virDomainNumaGetNodeCount(def->numa)) {
virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
_("can't add memory backend for guest node '%d' as "
"the guest has only '%zu' NUMA nodes configured"),
mem->targetNode, virDomainNumaGetNodeCount(def->numa));
return -1;
}
if (memAccess == VIR_DOMAIN_MEMORY_ACCESS_DEFAULT)
memAccess = virDomainNumaGetNodeMemoryAccessMode(def->numa, mem->targetNode);

1
tests/qemuxml2argvdata/memory-hotplug-invalid-targetnode.err Normal file
View File

@ -0,0 +1 @@
can't add memory backend for guest node '1' as the guest has only '1' NUMA nodes configured

42
tests/qemuxml2argvdata/memory-hotplug-invalid-targetnode.xml Normal file
View File

@ -0,0 +1,42 @@
<domain type='qemu'>
<name>QEMUGuest1</name>
<uuid>c7a5fdbd-edaf-9455-926a-d65c16db1809</uuid>
<maxMemory slots='16' unit='KiB'>1099511627776</maxMemory>
<memory unit='KiB'>1267710</memory>
<currentMemory unit='KiB'>1267710</currentMemory>
<vcpu placement='static' cpuset='0-1'>2</vcpu>
<os>
<type arch='x86_64' machine='pc'>hvm</type>
<boot dev='hd'/>
</os>
<cpu>
<topology sockets='2' dies='1' cores='1' threads='1'/>
<numa>
<cell id='0' cpus='0-1' memory='219136' unit='KiB'/>
</numa>
</cpu>
<clock offset='utc'/>
<on_poweroff>destroy</on_poweroff>
<on_reboot>restart</on_reboot>
<on_crash>destroy</on_crash>
<devices>
<emulator>/usr/bin/qemu-system-x86_64</emulator>
<disk type='block' device='disk'>
<source dev='/dev/HostVG/QEMUGuest1'/>
<target dev='hda' bus='ide'/>
<address type='drive' controller='0' bus='0' target='0' unit='0'/>
</disk>
<controller type='ide' index='0'/>
<controller type='usb' index='0'/>
<controller type='pci' index='0' model='pci-root'/>
<input type='mouse' bus='ps2'/>
<input type='keyboard' bus='ps2'/>
<memballoon model='virtio'/>
<memory model='dimm'>
<target>
<size unit='KiB'>523264</size>
<node>1</node>
</target>
</memory>
</devices>
</domain>

1
tests/qemuxml2argvtest.c
View File

@ -3079,6 +3079,7 @@ mymain(void)
DO_TEST_FAILURE_NOCAPS("memory-align-fail");
DO_TEST_PARSE_ERROR("memory-hotplug-nonuma", QEMU_CAPS_DEVICE_PC_DIMM);
DO_TEST_PARSE_ERROR_NOCAPS("memory-hotplug-invalid-targetnode");
DO_TEST_NOCAPS("memory-hotplug");
DO_TEST("memory-hotplug", QEMU_CAPS_DEVICE_PC_DIMM, QEMU_CAPS_NUMA);
DO_TEST("memory-hotplug-dimm", QEMU_CAPS_DEVICE_PC_DIMM, QEMU_CAPS_NUMA,