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Man Pages
VIRTIO_BLK(4) FreeBSD Kernel Interfaces Manual VIRTIO_BLK(4)

virtio_blk
VirtIO Block driver

To compile this driver into the kernel, place the following lines in your kernel configuration file:
device virtio_blk
Alternatively, to load the driver as a module at boot time, place the following line in loader.conf(5):
virtio_blk_load="YES"

The virtio_blk device driver provides support for VirtIO block devices.

Tunables can be set at the loader(8) prompt before booting the kernel or stored in loader.conf(5).
hw.vtblk.no_ident
 
hw.vtblk.X.no_ident
These tunables disable retrieving the device identification string from the hypervisor either globally or per-device. The default value is 0.
hw.vtblk.writecache_mode
 
hw.vtblk.X.writecache_mode
These tunables determine the write cache mode globally or per-device. The mode can changed only if the ConfigWCE feature is negotiated. Set to 0 for writethrough mode, 1 for writeback mode, and -1 to leave it as-is. The default value is to leave as-is.

The following variables are available as sysctl(8) variables.
dev.vtblk.X.writecache_mode
The write cache mode of the device can be either writethrough (0) or writeback (1). If the ConfigWCE feature is negotiated, the write cache mode can be toggled between writethrough and writeback.

virtio(4)

The virtio_blk driver was written by Bryan Venteicher <bryanv@FreeBSD.org>. It first appeared in FreeBSD 9.0.
July 2, 2013 FreeBSD 12.0-RELEASE

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