Re: [Users] VirtIO Console Device Enabled option?

[Itamar Heim]

On 12/19/2013 03:50 PM, Gianluca Cecchi wrote:
On Thu, Dec 19, 2013 at 8:23 PM, Jorick Astrego wrote:
I guess it is for this:
http://www.linux-kvm.com/content/new-virtioconsole-infrastructure-introduced-kvm-84


It seems you are right.
Going to test, I tried to enable it on a CentOS 6.4 guest named "c6s"

It seems all ok from a guest point of view (apart the tty that seems
not to be automatically spawned from agetty or friend)
I also read
http://fedoraproject.org/wiki/Features/VirtioSerial
But I don't know if this will be usable at this time from oVirt in any way....

it replaces the need to do this via a custom hook. its meant to allow 
you to connect to serial console, which you can do today if you do it 
locally, or put something like conserver, etc.
you are correct that there is still no integrated solution for remote, 
secure, access to it.


[root@c6s ~]# cat /etc/redhat-release
CentOS release 6.4 (Final)

[root@c6s ~]# uname -r
2.6.32-358.18.1.el6.x86_64

[root@c6s ~]# lsmod|grep virtio
virtio_balloon          4798  0
virtio_console         17806  2
virtio_net             16856  0
virtio_blk              7164  3
virtio_scsi             9139  1
virtio_pci              6985  0
virtio_ring             8301  6
virtio_balloon,virtio_console,virtio_net,virtio_blk,virtio_scsi,virtio_pci
virtio                  4977  6
virtio_balloon,virtio_console,virtio_net,virtio_blk,virtio_scsi,virtio_pci


[root@c6s ~]# cat /sys/class/virtio-ports/vport0p1/name
com.redhat.rhevm.vdsm

[root@c6s ~]# ll /dev/virtio-ports/com.redhat.rhevm.vdsm
lrwxrwxrwx 1 root root 11 Dec 19 19:42
/dev/virtio-ports/com.redhat.rhevm.vdsm -> ../vport0p1

[root@c6s ~]# ll /dev/hvc*
crw-rw---- 1 root dialout 229, 0 Dec 19 19:42 /dev/hvc0
crw-rw---- 1 root dialout 229, 1 Dec 19 19:42 /dev/hvc1
crw-rw---- 1 root dialout 229, 2 Dec 19 19:42 /dev/hvc2
crw-rw---- 1 root dialout 229, 3 Dec 19 19:42 /dev/hvc3
crw-rw---- 1 root dialout 229, 4 Dec 19 19:42 /dev/hvc4
crw-rw---- 1 root dialout 229, 5 Dec 19 19:42 /dev/hvc5
crw-rw---- 1 root dialout 229, 6 Dec 19 19:42 /dev/hvc6
crw-rw---- 1 root dialout 229, 7 Dec 19 19:42 /dev/hvc7
[root@c6s ~]#


qemu originated command line has

-chardev pty,id=charconsole0 -device
virtconsole,chardev=charconsole0,id=console0

complete is

qemu      3032     1  5 21:30 ?        00:00:38
/usr/bin/qemu-system-x86_64 -machine accel=kvm -name c6s -S -machine
pc-1.0,accel=kvm,usb=off -cpu Opteron_G2 -m 1024 -smp
1,sockets=1,cores=1,threads=1 -uuid
4147e0d3-19a7-447b-9d88-2ff19365bec0 -smbios
type=1,manufacturer=oVirt,product=oVirt
Node,version=19-5,serial=34353439-3036-435A-4A38-303330393338,uuid=4147e0d3-19a7-447b-9d88-2ff19365bec0
-no-user-config -nodefaults -chardev
socket,id=charmonitor,path=/var/lib/libvirt/qemu/c6s.monitor,server,nowait
-mon chardev=charmonitor,id=monitor,mode=control -rtc
base=2013-12-19T18:42:22,driftfix=slew -no-shutdown -device
piix3-usb-uhci,id=usb,bus=pci.0,addr=0x1.0x2 -device
virtio-scsi-pci,id=scsi0,bus=pci.0,addr=0x4 -device
virtio-serial-pci,id=virtio-serial0,bus=pci.0,addr=0x6 -drive
if=none,id=drive-ide0-1-0,readonly=on,format=raw,serial= -device
ide-cd,bus=ide.1,unit=0,drive=drive-ide0-1-0,id=ide0-1-0 -drive
file=/rhev/data-center/mnt/glusterSD/f18ovn01.mydomain:gvdata/d0b96d4a-62aa-4e9f-b50e-f7a0cb5be291/images/a5e4f67b-50b5-4740-9990-39deb8812445/53408cb0-bcd4-40de-bc69-89d59b7b5bc2,if=none,id=drive-virtio-disk0,format=raw,serial=a5e4f67b-50b5-4740-9990-39deb8812445,cache=none,werror=stop,rerror=stop,aio=threads
-device 
virtio-blk-pci,scsi=off,bus=pci.0,addr=0x5,drive=drive-virtio-disk0,id=virtio-disk0,bootindex=1
-drive 
file=/rhev/data-center/mnt/glusterSD/f18ovn01.mydomain:gvdata/d0b96d4a-62aa-4e9f-b50e-f7a0cb5be291/images/c1477133-6b06-480d-a233-1dae08daf8b3/c2a82c64-9dee-42bb-acf2-65b8081f2edf,if=none,id=drive-scsi0-0-0-0,format=raw,serial=c1477133-6b06-480d-a233-1dae08daf8b3,cache=none,werror=stop,rerror=stop,aio=threads
-device 
scsi-hd,bus=scsi0.0,channel=0,scsi-id=0,lun=0,drive=drive-scsi0-0-0-0,id=scsi0-0-0-0
-netdev tap,fd=29,id=hostnet0,vhost=on,vhostfd=30 -device
virtio-net-pci,netdev=hostnet0,id=net0,mac=00:1a:4a:8f:04:f8,bus=pci.0,addr=0x3
-chardev 
socket,id=charchannel0,path=/var/lib/libvirt/qemu/channels/4147e0d3-19a7-447b-9d88-2ff19365bec0.com.redhat.rhevm.vdsm,server,nowait
-device 
virtserialport,bus=virtio-serial0.0,nr=1,chardev=charchannel0,id=channel0,name=com.redhat.rhevm.vdsm
-chardev 
socket,id=charchannel1,path=/var/lib/libvirt/qemu/channels/4147e0d3-19a7-447b-9d88-2ff19365bec0.org.qemu.guest_agent.0,server,nowait
-device 
virtserialport,bus=virtio-serial0.0,nr=2,chardev=charchannel1,id=channel1,name=org.qemu.guest_agent.0
-chardev spicevmc,id=charchannel2,name=vdagent -device
virtserialport,bus=virtio-serial0.0,nr=3,chardev=charchannel2,id=channel2,name=com.redhat.spice.0
-chardev pty,id=charconsole0 -device
virtconsole,chardev=charconsole0,id=console0 -spice
tls-port=5901,addr=0,x509-dir=/etc/pki/vdsm/libvirt-spice,tls-channel=main,tls-channel=display,tls-channel=inputs,tls-channel=cursor,tls-channel=playback,tls-channel=record,tls-channel=smartcard,tls-channel=usbredir,seamless-migration=on
-k en-us -vga qxl -global qxl-vga.ram_size=67108864 -global
qxl-vga.vram_size=67108864 -device
virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x7

Gianluca
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