This patch adds a few lines to the KVM common code to fire a
KOBJ_CHANGE uevent whenever a KVM VM is created or destroyed. The event
carries four environment variables:
KVM_VM_CREATED indicates how many times a new VM has been created. It
is useful for example to trigger specific actions when
the first VM is started
KVM_VM_COUNT indicates how many VMs are currently active. This can be
used for logging or monitoring purposes
KVM_VM_PID has the pid of the KVM process that has been started or
stopped. This can be used to perform process-specific
tuning.
KVM_VM_STATS_PATH contains the path in /sys to the directory with all
the runtime statistics for this VM. This is useful
for performance monitoring and profiling.
Specific udev rules can be then set up in userspace to deal with the
creation or destruction of VMs as needed.
v1 -> v2:
* added KVM_VM_PID and KVM_VM_STATS_PATH
* some cleanup, the patch should look nicer now
* rebased on 4.12
Claudio Imbrenda (1):
KVM: trigger uevents when starting or stopping a VM
virt/kvm/kvm_main.c | 50 ++++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 50 insertions(+)
--
2.7.4
