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Michal Privoznik 06f405c627 qemu: Explicitly forbid live changing nodeset for strict numatune 
Let's imagine a guest that's configured with strict numatune:

  <numatune>
    <memory mode='strict' nodeset='0'/>
  </numatune>

For guests with NUMA:
Depending on machine type used (see commit v6.4.0-rc1~75) we
generate either:

  1) -object '{"qom-type":"memory-backend-ram","id":"ram-node0",\
               "size":20971520,"host-nodes":[0],"policy":"preferred"}' \
     -numa node,nodeid=0,cpus=0,memdev=ram-node0

or

  2) -numa node,nodeid=0,cpus=0,mem=20480

Later, when QEMU boots up and cpuset CGroup controller is
available we further restrict QEMU there too. But there's a
behaviour difference hidden: while in case 1) QEMU is restricted
from beginning, in case 2) it is not and thus it may happen that
it will allocate memory from different NUMA node and even though
CGroup will try to migrate it, it may fail to do so (e.g. because
memory is locked). Therefore, one can argue that case 2) is
broken. NB, case 2) is exactly what mode 'restrictive' is for.
However, in case 1) we are unable to update QEMU with new
host-nodes, simply because it's lacking a command to do so.

For guests without NUMA:
It's very close to case 2) from above. We have commit
v7.10.0-rc1~163 that prevents us from outputting host-nodes when
generating memory-backend-* for system memory, but that simply
allows QEMU to allocate memory anywhere and then relies on
CGroups to move it to desired location.

Due to all of this, there is no reliable way to change nodeset
for mode 'strict'. Let's forbid it.

Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
Reviewed-by: Pavel Hrdina <phrdina@redhat.com>
2021-12-17 13:21:48 +01:00
..
fonts meson: add rule to build and install only web documentation 2020-08-03 09:27:06 +02:00
gitdm gitdm: Add other email into Red Hat company list 2021-10-12 16:46:45 +02:00
go meson: Use 'rst2html5' instead of 'rst2html' everywhere 2021-08-10 16:33:07 +02:00
html meson: add rule to build and install only web documentation 2020-08-03 09:27:06 +02:00
internals docs: use g_auto in virCommand example 2021-12-14 16:41:36 +01:00
js meson: add rule to build and install only web documentation 2020-08-03 09:27:06 +02:00
kbase kbase: Document virtio-mem 2021-10-01 11:05:12 +02:00
logos docs: fix misc spelling errors reported by codespell 2020-10-05 10:28:37 +01:00
manpages qemu: Explicitly forbid live changing nodeset for strict numatune 2021-12-17 13:21:48 +01:00
schemas conf: add support for setting SEV kernel hashes 2021-12-16 18:02:58 +00:00
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aclpolkit.rst docs: html.in: Convert aclpolkit to rst 2021-03-15 17:31:35 +01:00
advanced-tests.rst lib: Drop internal virXXXPtr typedefs 2021-04-13 17:00:38 +02:00
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api_extension.rst lib: Drop internal virXXXPtr typedefs 2021-04-13 17:00:38 +02:00
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cgroups.html.in vircgroup: introduce nested cgroup to properly work with systemd 2021-02-10 13:37:12 +01:00
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coding-style.rst lib: Drop internal virXXXPtr typedefs 2021-04-13 17:00:38 +02:00
committer-guidelines.rst meson: adjust our documentation to mention meson instead of autoconf 2020-08-03 09:27:09 +02:00
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drivers.html.in Add basic driver for the Cloud-Hypervisor 2021-06-04 10:56:06 +01:00
drvbhyve.html.in docs: bhyve: document virtio-9p support 2020-10-12 15:26:00 +04:00
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formatcaps.html.in docs: fix migration_features element name in formatcaps.html.in 2021-09-15 17:00:19 +02:00
formatcheckpoint.rst conf: checkpoint: Don't require <domain> when redefining checkpoints 2020-12-04 16:15:03 +01:00
formatdomain.rst qemu: Allow VIR_DOMAIN_NUMATUNE_MEM_RESTRICTIVE in qemuDomainSetNumaParamsLive() 2021-12-17 13:18:54 +01:00
formatdomaincaps.html.in conf: extend domain capabilities for max SEV guest count 2021-12-14 16:04:17 +00:00
formatnetwork.html.in Fix format network dns doc 2021-01-26 14:29:48 +01:00
formatnetworkport.html.in docs: formatnetworkport: Fix typos 2021-04-01 13:32:25 +02:00
formatnode.html.in Add PCI VPD Capability Documentation 2021-10-21 17:34:04 +01:00
formatnwfilter.html.in doc: document new filters and not documented ones 2020-11-04 17:21:45 +01:00
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formatsnapshot.html.in conf: snapshot: Add support for <metadata_cache> 2021-01-08 15:27:00 +01:00
formatstorage.html.in storage: add support for QCOW2 cluster_size option 2021-05-21 14:00:43 +02:00
formatstoragecaps.html.in docs: Fix link for virConnectGetStoragePoolCapabilities 2020-12-02 16:15:43 +01:00
formatstorageencryption.html.in docs: add minor clarifications for librbd encryption 2021-11-09 14:42:23 +01:00
generic.css docs: css: Make definition list 'code' entries bold when converted from rst 2020-08-03 18:41:11 +02:00
glib-adoption.rst docs: glib-adoption: add string arrays and objects 2020-10-02 14:10:44 +02:00
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hooks.html.in docs: fix misc spelling errors reported by codespell 2020-10-05 10:28:37 +01:00
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libvirt-go.rst docs: introduce stubs for new libvirt Go packages 2021-06-07 17:04:14 +01:00
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meson.build docs: Convert 'migration' doc to RST 2021-12-07 09:00:39 +01:00
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migration.rst docs: migration: Add a paragraph about non-shared storage migration 2021-12-07 09:00:39 +01:00
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pci-addresses.rst Fix spelling 2021-04-15 15:42:21 +02:00
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platforms.rst docs/platforms: Drop separate link to qemu-kvm on repology.org 2021-04-12 16:09:41 +02:00
programming-languages.rst Fix capitalization "CLang" -> "Clang" 2020-11-12 15:01:42 +01:00
python.html.in doc/python: Update to Python 3 2020-04-20 14:06:25 +01:00
remote.html.in Add suggestions for virt-pki-query-dn usage 2021-11-12 12:37:29 +01:00
securityprocess.html.in docs: fix misc spelling errors reported by codespell 2020-10-05 10:28:37 +01:00
site.xsl docs: fix libvirt go-import metadata in pages and links in 404 page 2020-08-04 17:06:33 +01:00
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strategy.html.in docs: fix misc spelling errors reported by codespell 2020-10-05 10:28:37 +01:00
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styleguide.rst docs: Document list-tables as recommended 2020-05-11 13:55:27 +02:00
submitting-patches.rst docs/submitting-patches: add reference to DCO 2020-10-09 09:12:39 +02:00
subsite.xsl docs: fix libvirt go-import metadata in pages and links in 404 page 2020-08-04 17:06:33 +01:00
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