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qemu: Fix memory locking limit calculation

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For guests that use <memoryBacking><locked>, our only option
is to remove the memory locking limit altogether.

Partially-resolves: https://bugzilla.redhat.com/1431793
This commit is contained in:
Andrea Bolognani 2017-03-22 13:44:13 +01:00
parent 1f7661af8c
commit 7e667664d2
1 changed files with 7 additions and 4 deletions
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11
src/qemu/qemu_domain.c
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@ -6223,10 +6223,13 @@ qemuDomainGetMemLockLimitBytes(virDomainDefPtr def)
goto done;
}
if (def->mem.locked) {
memKB = virDomainDefGetMemoryTotal(def) + 1024 * 1024;
goto done;
}
/* If the guest wants its memory to be locked, we need to raise the memory
* locking limit so that the OS will not refuse allocation requests;
* however, there is no reliable way for us to figure out how much memory
* the QEMU process will allocate for its own use, so our only way out is
* to remove the limit altogether. Use with extreme care */
if (def->mem.locked)
return VIR_DOMAIN_MEMORY_PARAM_UNLIMITED;
if (ARCH_IS_PPC64(def->os.arch) && def->virtType == VIR_DOMAIN_VIRT_KVM) {
unsigned long long maxMemory;