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Re: [Qemu-devel] vnc port selection

From: Avi Kivity
Subject: Re: [Qemu-devel] vnc port selection
Date: Thu, 21 Aug 2008 21:30:21 +0300
User-agent: Thunderbird (X11/20080723)

Gerd Hoffmann wrote:
  Hi folks,

Xen's qemu-dm version has a '-vncunused' command line switch which asks
the internal vnc server to pick any unused tcp port to listen on.  The
actual port is communicated to the outside world via xenstore.

I'm looking for a reasonable way to implement that functionality in
upstream qemu.  First, I think it shouldn't be a separate command line
switch but an option for the existion -vnc switch.  Second, we need a
way to communicate the port picked which isn't xen-specific.  Obvious
choice is a monitor info subcommand.

Comments?  Other suggestions?

Presumably -vncunused is passed by the management application, which knows about all domains. Can't it figure out an unused port and pass it on?

Alternatively, have the management application pass an fd denoting the socket.

I have a truly marvellous patch that fixes the bug which this
signature is too narrow to contain.

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