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Description of problem:
----------------------------
NUMA emulation failed with extra memory not specified in any node.
Version-Release number of selected component (if applicable):
----------------------------------------------------------------
qemu-kvm-1.5.3-60.el7_0.1.x86_64
How reproducible:
------------------
100%
Steps to Reproduce:
-----------------------
boot guest with memory lager than specified in all nodes, like:
-m 5G -numa node,mem=1024,cpus=0,nodeid=0 -numa node,mem=1024,cpus=1,nodeid=1 -numa node,mem=1024,cpus=2,nodeid=2 -numa node,mem=1024,cpus=3,nodeid=3
Actual results:
------------------
in guest:
[root@localhost ~]# numactl --hardware
available: 1 nodes (0)
node 0 cpus: 0 1 2 3
node 0 size: 5119 MB
node 0 free: 4525 MB
node distances:
node 0
0: 10
(qemu) info numa
4 nodes
node 0 cpus: 0
node 0 size: 1024 MB
node 1 cpus: 1
node 1 size: 1024 MB
node 2 cpus: 2
node 2 size: 1024 MB
node 3 cpus: 3
node 3 size: 1024 MB
With "-m 4G", everything is fine.
I recall long time ago(we do not have a case cover the scenario) i tested this kind of scenario, if there is extra memory not specified in any node, it resides in node 0 by default, and other node is as specified, i am not sure whether it should work like this now, if this is as designed, feel free to close it.
Not a bug, QEMU is doing exactly what was requested by the user. But the guest chooses to ignore the NUMA topology because it doesn't make sense.
There are plans to abort QEMU in case the user provides such invalid configuration, though, so I am keeping the BZ open to track the new feature.
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.
For information on the advisory, and where to find the updated
files, follow the link below.
If the solution does not work for you, open a new bug report.
https://rhn.redhat.com/errata/RHSA-2015-0624.html