Re: [PATCH v2 1/4] conf: Introduce dynamicMemslots attribute for virtio-mem

Introduced in v8.2.0-rc0~74^2~2, QEMU now allows setting .dynamic-memslots attribute for virtio-mem-pci devices. When turned on, it allows memory exposed to guest to be split into multiple memslots and thus smaller memory footprint (see the original commit for detailed explanation). Therefore, introduce new <target/> attribute which will control that QEMU knob. Signed-off-by: Michal Privoznik <mprivozn(a)redhat.com&gt; --- docs/formatdomain.rst | 6 ++++++ src/conf/domain_conf.c | 18 +++++++++++++++++- src/conf/domain_conf.h | 1 + src/conf/schemas/domaincommon.rng | 5 +++++ .../memory-hotplug-virtio-mem.xml | 2 +- 5 files changed, 30 insertions(+), 2 deletions(-) diff --git a/docs/formatdomain.rst b/docs/formatdomain.rst index 96e03a3807..57974de9f4 100644 --- a/docs/formatdomain.rst +++ b/docs/formatdomain.rst @@ -8395,6 +8395,12 @@ Example: usage of the memory devices The ``node`` subelement configures the guest NUMA node to attach the memory to. The element shall be used only if the guest has NUMA nodes configured. + For ``virtio-mem`` optional attribute ``dynamicMemslots`` can be specified + (accepted values "yes"/"no") which allows hypervisor to spread memory into + multiple memory slots (allocate them dynamically based on the amount of + memory exposed to the guest), resulting in smaller memory footprint. + :since:`Since 10.0.0 and QEMU 8.2.0`