Technically, this is another version of: https://www.redhat.com/archives/libvir-list/2020-December/msg00199.html But since virtio-pmem part is pushed now, I've reworked virtio-mem a bit and sending it as a new series. For curious ones, David summarized behaviour well when implementing virtio-mem support in kernel: https://lwn.net/Articles/755423/ For less curious ones: # virsh update-memory $dom --requested-size 4G adds additional 4GiB of RAM to guest; # virsh update-memory $dom --requested-size 0 removes those 4GiB added earlier. Patches are also available on my GitLab: https://gitlab.com/MichalPrivoznik/libvirt/-/tree/virtio_mem_v3 Michal Prívozník (10): virhostmem: Introduce virHostMemGetTHPSize() qemu_capabilities: Introduce QEMU_CAPS_DEVICE_VIRTIO_MEM_PCI conf: Introduce virtio-mem <memory/> model qemu: Build command line for virtio-mem qemu: Wire up <memory/> live update qemu: Wire up MEMORY_DEVICE_SIZE_CHANGE event qemu: Refresh the actual size of virtio-mem on monitor reconnect qemu: Recalculate balloon on MEMORY_DEVICE_SIZE_CHANGE event and reconnect virsh: Introduce update-memory command news: document recent virtio memory addition NEWS.rst | 7 + docs/formatdomain.rst | 42 +++- docs/manpages/virsh.rst | 31 +++ docs/schemas/domaincommon.rng | 16 ++ src/conf/domain_conf.c | 100 ++++++++- src/conf/domain_conf.h | 13 ++ src/conf/domain_validate.c | 39 ++++ src/libvirt_private.syms | 3 + src/qemu/qemu_alias.c | 10 +- src/qemu/qemu_capabilities.c | 2 + src/qemu/qemu_capabilities.h | 1 + src/qemu/qemu_command.c | 13 +- src/qemu/qemu_domain.c | 50 ++++- src/qemu/qemu_domain.h | 1 + src/qemu/qemu_domain_address.c | 37 ++- src/qemu/qemu_driver.c | 211 +++++++++++++++++- src/qemu/qemu_hotplug.c | 18 ++ src/qemu/qemu_hotplug.h | 5 + src/qemu/qemu_monitor.c | 37 +++ src/qemu/qemu_monitor.h | 27 +++ src/qemu/qemu_monitor_json.c | 94 ++++++-- src/qemu/qemu_monitor_json.h | 5 + src/qemu/qemu_process.c | 101 ++++++++- src/qemu/qemu_validate.c | 8 + src/security/security_apparmor.c | 1 + src/security/security_dac.c | 2 + src/security/security_selinux.c | 2 + src/util/virhostmem.c | 63 ++++++ src/util/virhostmem.h | 3 + tests/domaincapsmock.c | 9 + .../caps_5.1.0.x86_64.xml | 1 + .../caps_5.2.0.x86_64.xml | 1 + ...mory-hotplug-virtio-mem.x86_64-latest.args | 49 ++++ .../memory-hotplug-virtio-mem.xml | 66 ++++++ tests/qemuxml2argvtest.c | 1 + ...emory-hotplug-virtio-mem.x86_64-latest.xml | 1 + tests/qemuxml2xmltest.c | 1 + tools/virsh-domain.c | 154 +++++++++++++ 38 files changed, 1165 insertions(+), 60 deletions(-) create mode 100644 tests/qemuxml2argvdata/memory-hotplug-virtio-mem.x86_64-latest.args create mode 100644 tests/qemuxml2argvdata/memory-hotplug-virtio-mem.xml create mode 120000 tests/qemuxml2xmloutdata/memory-hotplug-virtio-mem.x86_64-latest.xml -- 2.26.2
