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virhostmem: Handle numactl-less build in hugepages allocation/reporting

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When using 'virsh freepages' or 'virsh allocpages' then
virHostMemGetFreePages() or virHostMemAllocPages() is called,
respectively. But the following may happen: libvirt was built
without numactl support and thus a fake NUMA node was constructed
for capabilities, which means that startCell is going to be 0.
But we can't blindly pass startCell = 0 to virNumaGetPageInfo()
nor virNumaSetPagePoolSize() because they would operate over node
specific path (/sys/devices/system/node/nodeX) rather than NUMA
agnostic path (/sys/kernel/mm/hugepages/) and we are not
guaranteed that the former exists (kernel might have been built
without NUMA support).

Resolves:https://bugzilla.redhat.com/show_bug.cgi?id=1978574

Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
Reviewed-by: Martin Kletzander <mkletzan@redhat.com>
This commit is contained in:
Michal Privoznik 2021-08-19 15:54:31 +02:00
parent ebec3de97d
commit 78d4c12b8c
1 changed files with 16 additions and 0 deletions
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16
src/util/virhostmem.c
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@ -849,6 +849,14 @@ virHostMemGetFreePages(unsigned int npages,
int cell;
size_t i, ncounts = 0;
if (!virNumaIsAvailable() && lastCell == 0 &&
startCell == 0 && cellCount == 1) {
/* As a special case, if we were built without numactl and want to
* fetch info on the fake NUMA node set startCell to -1 to make the
* loop below fetch overall info. */
startCell = -1;
}
if (startCell > lastCell) {
virReportError(VIR_ERR_INTERNAL_ERROR,
_("start cell %d out of range (0-%d)"),
@ -891,6 +899,14 @@ virHostMemAllocPages(unsigned int npages,
int cell;
size_t i, ncounts = 0;
if (!virNumaIsAvailable() && lastCell == 0 &&
startCell == 0 && cellCount == 1) {
/* As a special case, if we were built without numactl and want to
* allocate hugepages on the fake NUMA node set startCell to -1 to make
* the loop below operate on NUMA agnostic sysfs paths. */
startCell = -1;
}
if (startCell > lastCell) {
virReportError(VIR_ERR_INTERNAL_ERROR,
_("start cell %d out of range (0-%d)"),