VIOMB(4) BSD Kernel Interfaces Manual VIOMB(4)NAME
viomb -- VirtIO memory ballooning driver
SYNOPSIS
virtio* at pci? dev ? function ?
viomb* at virtio?
DESCRIPTION virtio(4) defines an interface for efficient, standard, and extensible I/O between the hypervisor and the virtual machine. 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 e.g. Qemu monitor balloon command).
2. The hypervisor sends the request via VirtIO memory ballooning device.
3. The guest viomb driver requests allocation of that amount of physical memory from the NetBSD memory management system.
4. The viomb device tells the hypervisor the guest physical memory address of the allocated memory via VirtIO memory ballooning device.
The sysctl node hw.viomb.npages shows the requested number of memory pages to return to the hypervisor, while hw.viomb.actual shows the
actual number of memory pages that are already returned to the hypervisor.
SEE ALSO virtio(4), sysctl(8)
Rusty Russell, IBM Corporation, Virtio PCI Card Specification, http://ozlabs.org/~rusty/virtio-spec/.
HISTORY
The viomb device driver appeared in NetBSD 6.0.
BUGS
The userland interface should be same as the Xen ballooning device.
BSD November 26, 2011 BSD
Check Out this Related Man Page
VIRTIO(4) BSD Kernel Interfaces Manual VIRTIO(4)NAME
virtio -- Para-virtualized I/O in a virtual machine
SYNOPSIS
virtio* at pci? dev ? function ?
ld* at virtio?
vioif* at virtio?
viomb* at virtio?
DESCRIPTION
virtio defines an interface for efficient, standard and extensible I/O between the hypervisor and the virtual machine. The virtio device
driver represents an emulated PCI device that the hypervisor makes available to the virtual machine.
virtio driver itself provides the core infrastructure to communicate with the hypervisor (called virtqueues) and supports the following
devices:
ld(4) A Disk device.
vioif(4)
An Ethernet device.
viomb(4)
A pseudo-device to release memory back to the hypervisor.
SEE ALSO ld(4), pci(4), vioif(4), viomb(4)
Rusty Russell, IBM Corporation, Virtio PCI Card Specification, http://ozlabs.org/~rusty/virtio-spec/.
HISTORY
The virtio driver first appeared in NetBSD 6.0.
BSD November 5, 2011 BSD
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