Re: [libvirt-users] pty pairing host - guest
On Thu, Mar 19, 2015 at 01:29:37PM +0530, Neel Basu wrote:
HI!,
I am using virt-manager GUI. There I can add a `Console Device` through
Add Hardware. I can add a virtio pty WITHOUT restarting the VM. also I get
a pty allocated to host machine say `/dev/pty/M`
My expectation is this `host:/dev/pty/M` is connected with a
`guest:/dev/ttyN`. so If I open minicom or screen and write to
`host:/dev/pty/M` it will be propagated to 'guest:/dev/ttyN'. Is my
expectation correct ?
If it is correct how will I know what is the guest tty allocated against
this host pty ?
No, that's not how it works. The <console> devices are exposed to
the guest as /dev/hvcNN devices. Starting with NN==0
Similar to console device I can add a Serial device but that requires
a
reboot of the guest VM. However I tried that though I prefer to do it
without a guest restart.
<serial type='pty'>
<source path='/dev/pts/1'/>
<target port='0'/>
<alias name='serial0'/>
</serial>
here also I expected host:/dev/pts/1 is paired with /dev/ttyS0 but couldn't
communicate.
The serial port device supported is a 1990 era ISA bus serial port
so there's no hotplug for that. Only the paravirt consoles can be
hotplugged.
Regards,
Daniel
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