Re: [PATCH v2 09/13] Introduce MEMORY_DEVICE_SIZE_CHANGE event

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(a)redhat.com&gt; --- 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)

+ * @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: