[libvirt-users] host to VM serial device configuration
John Paul Walters
jwalters at isi.edu
Fri Jan 14 19:35:31 UTC 2011
On Jan 14, 2011, at 9:44 AM, Daniel P. Berrange wrote:
> On Sat, Jan 15, 2011 at 01:09:07AM +1100, Justin Clift wrote:
>> On 14/01/2011, at 9:39 PM, Daniel P. Berrange wrote:
>>> On Fri, Jan 14, 2011 at 11:50:01AM +0800, Osier Yang wrote:
>>>> 于 2011年01月12日 23:11, John Paul Walters 写道:
>>>>> Hi,
>>>>>
>>>>> I'm trying to get a virtual serial device up and running between
>>>>> my host
>>>>> and virtual machine with a device name on the host. I'm using
>>>>> libvirt
>>>>> 0.8.3 and qemu 0.13.0. The challenge that I'm running into is
>>>>> that I'm
>>>>> able to get a serial device, but I cannot fix it to a pre-
>>>>> defined device
>>>>> name. For example, I'm using the following in my VM's xml file:
>>>>>
>>>>> <serial type='pty'>
>>>>> <source path='/dev/pts/19' />
>>>>> <target port='0' />
>>>>> </serial>
>>>>>
>>>>> As I said this works, but it doesn't set the host side to /dev/
>>>>> pts/19.
>>>>> Is there any way to do this?
>>>>
>>>> I could reproduce it, trying to find out why.
>>>
>>> When using type='type', the source path is an output only
>>> attribute. You can't control it yourself, it is autoassigned
>>> by the kernel as it sees fit.
>>
>> Any idea if it's the kind of thing whose name could be selected or
>> changed
>> using udev rules?
>
> No, these aren't normal devices. This is a magic filesystem
> which creates entries on the fly.
Thanks for the replies. I'm not necessarily stuck on type='pty'. I
just need to be able to pin the device name or a pipe name to
something known on the host side. Along those lines, I've tried using
type='pipe' like so:
<serial type='pipe'>
<source path='/tmp/mypipe' />
<target port='1' />
</serial>
I've created the /tmp/mypipe.in and /tmp/mypipe.out using mkfifo per
the qemu directions. But I'm not sure what this is supposed to look
like on the VM-side. I notice that I have a ttyS1 in the VM, which I
believe is connected to the pipe on the host side, but do I use this
as a serial device or as a named pipe?
regards,
JP
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