VIOMB(4) BSD Kernel Interfaces Manual VIOMB(4)
viomb -- VirtIO memory ballooning driver
viomb* at virtio?
The viomb driver supports the virtio-compliant memory ballooning device.
Memory ballooning works as follows:
1. The host operator requests a guest to return some amount of memory
to the host (via, for example, the QEMU monitor balloon command).
2. The hypervisor sends the request via the VirtIO memory ballooning
3. The guest viomb driver requests allocation of that amount of physi-
cal memory from the OpenBSD memory management system.
4. The viomb device tells the hypervisor the guest physical memory
address of the allocated memory via the VirtIO memory ballooning
Rusty Russell, IBM Corporation, Virtio PCI Card Specification,
The viomb device driver first appeared in OpenBSD 5.3.
BSD January 16, 2013 BSD