Re: [CentOS-virt] working config for xen which would transfer a serial interface

Le Thu, 05 Aug 2010 16:31:21 +0300, Manuel Wolfshant wolfy@nobugconsulting.ro a écrit :

Hello

 Can anyone share a known working config for xen which would 

transfer a serial interface ( add-on card preferably, mine uses e880-e887 : 0000:03:05.0 / ec00-ec07 : 0000:03:05.0 ) to a DomU ?

Sorry, only the on-board standard serial port here :

## dom0 : /etc/xen/omega name = "omega" kernel = "/boot/vmlinuz-2.6.18-128.1.6.el5xen" ramdisk = "/boot/initrd-2.6.18-128.1.6.el5xen.img" memory = 256 vif = [ 'mac=AA:00:AC:10:01:0f, bridge=xenbr1' ] disk = ['file:/var/lib/xen/images/omega.img,sda1,w' ] # serial port : irq = [ 4 ] ioports = [ "3f8-3ff" ] # root = "/dev/sda1 ro" extra = "fastboot"

## domU : /etc/rc.local # but should be in /etc/udev/somewhere modprobe -a serial_core 8250 chown root:ups /dev/ttyS0

## domU : ls /lib/modules/2.6.18-128.1.6.el5xen/kernel/drivers/serial/ 8250.ko 8250_pci.ko 8250_pnp.ko jsm serial_core.ko serial_cs.ko

## domU : lsmod | egrep '(serial|8250)' 8250 35685 2 serial_core 24641 1 8250

## domU : dmesg | grep -i serial Serial: 8250/16550 driver $Revision: 1.90 $ 4 ports, IRQ sharing enabled serial8250: ttyS0 at I/O 0x3f8 (irq = 4) is a 16550A

[root@Dom0 ~]# dmesg | grep ttyS

Xen virtual console successfully installed as ttyS0 (from /var/log/dmesg, the output of dmesg is full of messages from iptables)

[root@Dom0 ~]# cat /etc/modprobe.d/blacklist #[...]

blacklist 8250 blacklist 8250_pnp blacklist serial_core

[root@Dom0 ~]# grep xen /etc/grub.conf

title CentOS (2.6.18-194.8.1.el5xen) kernel /boot/xen.gz-2.6.18-194.8.1.el5 dom0_mem=256M vga=mode-0x307 noreboot dom0_vcpus_pin dom0_max_vcpus=1 xencons=tty module /boot/vmlinuz-2.6.18-194.8.1.el5xen ro root=LABEL=/ module /boot/initrd-2.6.18-194.8.1.el5xen.img # (not up-to-date because I am lazy...)

sniff from the boot messages in tge DomU:

XENBUS: Device with no driver: device/vbd/2049 XENBUS: Device with no driver: device/vif/0 # ( nothing more )

[root@DomU ~]# cat /proc/interrupts CPU0

4: 82698953 Phys-irq serial

[root@DomU ~]# cat /proc/ioports

03f8-03ff : serial

[root@DomU ~]# lsmod Module Size Used by 8250_pnp 43969 0 parport_serial 41153 0 8250_pci 56257 1 parport_serial 8250 86057 2 8250_pnp,8250_pci serial_core 56385 1 8250 [...]

Good (for a standard serial port) but useless without a port.

This domU has been created from an image from http://stacklet.com/. I had no problem at all.

Good luck,