VIRTIO_CONSOLE(4) BSD Kernel Interfaces Manual VIRTIO_CONSOLE(4)NAME
virtio_console -- VirtIO Console driver
SYNOPSIS
To compile this driver into the kernel, place the following lines in your kernel configuration file:
device virtio_console
Alternatively, to load the driver as a module at boot time, place the following line in loader.conf(5):
virtio_console_load="YES"
DESCRIPTION
The virtio_console device driver provides support for VirtIO console devices.
The console device may have one or more ports. Each port is similar to a simple serial interface, and each port is accessible through
tty(4).
FILES
/dev/ttyV?.??
SEE ALSO tty(4), virtio(4)HISTORY
The virtio_console driver was written by Bryan Venteicher <bryanv@FreeBSD.org>.
BSD October 22, 2014 BSD
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VIRTIO_BLK(4) BSD Kernel Interfaces Manual VIRTIO_BLK(4)NAME
virtio_blk -- VirtIO Block driver
SYNOPSIS
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"
DESCRIPTION
The virtio_blk device driver provides support for VirtIO block devices.
LOADER TUNABLES
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 negoti-
ated. 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.
SYSCTL VARIABLES
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.
SEE ALSO virtio(4)HISTORY
The virtio_blk driver was written by Bryan Venteicher <bryanv@FreeBSD.org>. It first appeared in FreeBSD 9.0.
BSD July 2, 2013 BSD
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