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NetBSD 6.1.5 - man page for viomb (netbsd section 4)

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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 allo-
	  cated 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
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