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qemu: increase locked memory limit when a vDPA device is present

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Just like VFIO devices, vDPA devices may need to have all guest memory
pages locked/pinned in order to operate properly. In the case of VFIO
devices (including mdev and NVME, which also use VFIO) libvirt
automatically increases the locked memory limit when one of those
devices is present. This patch modifies that code to also increase the
limit if there are any vDPA devices present.

Resolves: https://bugzilla.redhat.com/1939776
Signed-off-by: Laine Stump <laine@redhat.com>
Reviewed-by: Daniel Henrique Barboza <danielhb413@gmail.com>
This commit is contained in:
Laine Stump 2021-03-23 14:39:37 -04:00
parent e7068a0bc2
commit 98e22ff749
1 changed files with 2 additions and 2 deletions
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4
src/qemu/qemu_domain.c
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@ -9199,7 +9199,7 @@ getPPC64MemLockLimitBytes(virDomainDefPtr def,
passthroughLimit = maxMemory +
128 * (1ULL<<30) / 512 * nPCIHostBridges +
8192;
} else if (forceVFIO || qemuDomainNeedsVFIO(def)) {
} else if (forceVFIO || qemuDomainNeedsVFIO(def) || virDomainDefHasVDPANet(def)) {
/* For regular (non-NVLink2 present) VFIO passthrough, the value
* of passthroughLimit is:
*
@ -9289,7 +9289,7 @@ qemuDomainGetMemLockLimitBytes(virDomainDefPtr def,
*
* Note that this may not be valid for all platforms.
*/
if (forceVFIO || qemuDomainNeedsVFIO(def))
if (forceVFIO || qemuDomainNeedsVFIO(def) || virDomainDefHasVDPANet(def))
memKB = virDomainDefGetMemoryTotal(def) + 1024 * 1024;
return memKB << 10;