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viomb(4) [netbsd man page]

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

XPCI(4) 						 BSD/xen Kernel Interfaces Manual						   XPCI(4)

NAME
xpci -- Xen frontend paravirtualized PCI pass-through driver SYNOPSIS
xpci* at xenbus? pci* at xpci? DESCRIPTION
The xpci driver is the frontend part of the PCI pass-through functionality that can be used by Xen guest domains to communicate with PCI devices. From a guest point of view, xpci is similar to a pci(4) bus, except that the guest talks with the PCI backend driver instead of the real physical device directly. When the host domain is NetBSD, the xpci driver is backed by a pciback(4) driver within the dom0. SEE ALSO
pci(4), pciback(4), xenbus(4) HISTORY
The xpci driver first appeared in NetBSD 5.1. AUTHORS
The xpci driver was written by Manuel Bouyer <bouyer@NetBSD.org>. SECURITY CONSIDERATIONS
As PCI passthrough offers the possibility for guest domains to send arbitrary PCI commands to a physical device, this has direct impact on the overall stability and security of the system. For example, in case of erroneous or malicious commands, the device could overwrite physi- cal memory portions, via DMA. BSD
January 8, 2011 BSD
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