[ovirt-users] experimenting with host device passthrough in ovirt 3.6
Hi.
I'd like to experiment with host device passthrough in ovirt 3.6.
I have a temperature sensor that connects up to a serial port.
I've plugged the device into one of my virt hosts, and through
/dev/ttyS1, I can read it.
# dmesg | grep ttyS1
[ 1.140221] 00:04: ttyS1 at I/O 0x2f8 (irq = 3) is a 16550A
ls -l /sys/class/tty/ttyS1/device/driver reveals:
total 0
drwxr-xr-x. 2 root root 0 Nov 7 19:01 .
drwxr-xr-x. 7 root root 0 Nov 7 19:01 ..
lrwxrwxrwx. 1 root root 0 Nov 9 11:32 00:04 ->
../../../../devices/pnp0/00:04
lrwxrwxrwx. 1 root root 0 Nov 9 11:32 00:05 ->
../../../../devices/pnp0/00:05
--w-------. 1 root root 4096 Nov 9 11:32 bind
--w-------. 1 root root 4096 Nov 7 19:01 uevent
--w-------. 1 root root 4096 Nov 9 11:32 unbind
# ls -al /sys/devices/pnp0/00\:04/
total 0
drwxr-xr-x. 4 root root 0 Nov 7 19:01 .
drwxr-xr-x. 17 root root 0 Nov 7 19:01 ..
lrwxrwxrwx. 1 root root 0 Nov 7 19:01 driver ->
../../../bus/pnp/drivers/serial
lrwxrwxrwx. 1 root root 0 Nov 9 11:34 firmware_node ->
../../LNXSYSTM:00/device:00/PNP0A08:00/device:18/PNP0501:00
-r--r--r--. 1 root root 4096 Nov 9 11:32 id
-r--r--r--. 1 root root 4096 Nov 9 11:34 options
drwxr-xr-x. 2 root root 0 Nov 7 19:01 power
-rw-r--r--. 1 root root 4096 Nov 9 11:32 resources
lrwxrwxrwx. 1 root root 0 Nov 7 19:01 subsystem -> ../../../bus/pnp
drwxr-xr-x. 3 root root 0 Nov 7 19:01 tty
-rw-r--r--. 1 root root 4096 Nov 7 19:01 uevent
I don't necessarily see this device listed in the host passtshrough.
In addition, since I'm able to connect to the serial device right now on
the host, this would mean that I need to "blacklist" that device from
the host so that when it boots, it doesn't load the driver?
Thanks for any help..
Jason.
--
Jason Keltz
Manager of Development
Department of Electrical Engineering and Computer Science
York University, Toronto, Canada
Tel: 416-736-2100 x. 33570
Fax: 416-736-5872