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qemu: Refactor qemuDomainAdjustMaxMemLock()

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Store the current memory locking limit and the desired one
separately, which will help with later changes.

Signed-off-by: Andrea Bolognani <abologna@redhat.com>
Reviewed-by: Michal Privoznik <mprivozn@redhat.com>
This commit is contained in:
Andrea Bolognani 2021-03-03 18:41:34 +01:00
parent a6b2804513
commit b4967d7498
1 changed files with 11 additions and 9 deletions
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20
src/qemu/qemu_domain.c
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@ -9343,27 +9343,29 @@ int
qemuDomainAdjustMaxMemLock(virDomainObjPtr vm,
bool forceVFIO)
{
unsigned long long bytes = 0;
unsigned long long currentMemLock = 0;
unsigned long long desiredMemLock = 0;
bytes = qemuDomainGetMemLockLimitBytes(vm->def, forceVFIO);
desiredMemLock = qemuDomainGetMemLockLimitBytes(vm->def, forceVFIO);
if (virProcessGetMaxMemLock(vm->pid, &currentMemLock) < 0)
return -1;
if (bytes) {
if (desiredMemLock > 0) {
/* If this is the first time adjusting the limit, save the current
* value so that we can restore it once memory locking is no longer
* required */
if (!vm->originalMemlock) {
if (virProcessGetMaxMemLock(vm->pid, &(vm->originalMemlock)) < 0)
return -1;
if (vm->originalMemlock == 0) {
vm->originalMemlock = currentMemLock;
}
} else {
/* Once memory locking is no longer required, we can restore the
* original, usually very low, limit */
bytes = vm->originalMemlock;
desiredMemLock = vm->originalMemlock;
vm->originalMemlock = 0;
}
if (bytes > 0 &&
virProcessSetMaxMemLock(vm->pid, bytes) < 0) {
if (desiredMemLock > 0 &&
virProcessSetMaxMemLock(vm->pid, desiredMemLock) < 0) {
return -1;
}