On Thu, Feb 18, 2021 at 14:31:04 +0100, Michal Privoznik wrote: > New event is introduced that is emitted whenever guest > acknowledges allocation change request of a virtio-mem. > The aim is to let applications know when that happens, > because changes in allocation are not synchronous with > issuing the request. Under the hood, the event is > emitted whenever QEMU emits MEMORY_DEVICE_SIZE_CHANGE > event. > > Signed-off-by: Michal Privoznik <mprivozn@xxxxxxxxxx> > --- > examples/c/misc/event-test.c | 17 ++++++ > include/libvirt/libvirt-domain.h | 23 ++++++++ > src/conf/domain_event.c | 84 +++++++++++++++++++++++++++++ > src/conf/domain_event.h | 10 ++++ > src/libvirt_private.syms | 2 + > src/qemu/qemu_driver.c | 6 +++ > src/remote/remote_daemon_dispatch.c | 30 +++++++++++ > src/remote/remote_driver.c | 32 +++++++++++ > src/remote/remote_protocol.x | 15 +++++- > src/remote_protocol-structs | 7 +++ > tools/virsh-domain.c | 20 +++++++ > 11 files changed, 245 insertions(+), 1 deletion(-) [...] > diff --git a/include/libvirt/libvirt-domain.h b/include/libvirt/libvirt-domain.h > index 8011cf9fe1..2c449b4f31 100644 > --- a/include/libvirt/libvirt-domain.h > +++ b/include/libvirt/libvirt-domain.h > @@ -4651,6 +4651,28 @@ typedef void (*virConnectDomainEventMemoryFailureCallback)(virConnectPtr conn, > unsigned int flags, > void *opaque); > > +/** > + * virConnectDomainEventMemoryDeviceSizeChangeCallback: > + * @conn: connection object > + * @dom: domain on which the event occurred > + * @alias: memory device alias > + * @size: new actual size of memory device (in KiB) I'd specifically call this actualsize or something to maybe add one more layer to avoid confuision with the 'size' > + * @opaque: application specified data > + * > + * The callback occurs when the guest acknowledges request to change size of > + * memory device (so far only virtio-mem model supports this). The @size then > + * reflects the new amount of guest visible memory (in kibibytes). > + * > + * The callback signature to use when registering for an event of type > + * VIR_DOMAIN_EVENT_ID_MEMORY_DEVICE_SIZE_CHANGE with > + * virConnectDomainEventRegisterAny(). > + */ > +typedef void (*virConnectDomainEventMemoryDeviceSizeChangeCallback)(virConnectPtr conn, > + virDomainPtr dom, > + const char *alias, > + unsigned long long size, > + void *opaque); > + > > /** > * VIR_DOMAIN_EVENT_CALLBACK: But I don't think it needs to be changed in the internals though.
