Re: [Qemu-devel] [PATCH v3 2/5] Add vmchannel command line option.

["Daniel P. Berrange" <berrange@redhat.com>]

On Thu, Jan 08, 2009 at 01:21:01PM -0600, Anthony Liguori wrote:
> Gleb Natapov wrote:
> >Signed-off-by: Gleb Natapov <gleb@redhat.com>
> >---
> >
> > vl.c |   75 
> > +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++-
> > 1 files changed, 74 insertions(+), 1 deletions(-)
> >
> >diff --git a/vl.c b/vl.c
> >index 959be62..c076375 100644
> >--- a/vl.c
> >+++ b/vl.c
> >@@ -207,6 +207,13 @@ static int full_screen = 0;
> > static int no_frame = 0;
> > #endif
> > int no_quit = 0;
> >+#if defined(CONFIG_SLIRP)
> >+#define MAX_VMCHANNEL_DEVICES 4
> >+struct VMChannel {
> >+    CharDriverState *hd;
> >+    int port;
> >+} vmchannel_hds[MAX_VMCHANNEL_DEVICES];
> >+#endif
> > CharDriverState *serial_hds[MAX_SERIAL_PORTS];
> > CharDriverState *parallel_hds[MAX_PARALLEL_PORTS];
> > #ifdef TARGET_I386
> >@@ -3948,6 +3955,9 @@ static void help(int exitcode)
> >            "-monitor dev    redirect the monitor to char device 'dev'\n"
> >            "-serial dev     redirect the serial port to char device 
> >            'dev'\n"
> >            "-parallel dev   redirect the parallel port to char device 
> >            'dev'\n"
> >+#if defined(CONFIG_SLIRP)
> >+	   "-vmchannel di:DI,dev  redirect the vmchannel device with device 
> >id DI, to char device 'dev'\n"
> >+#endif
> >            "-pidfile file   Write PID to 'file'\n"
> >            "-S              freeze CPU at startup (use 'c' to start 
> >            execution)\n"
> >            "-s              wait gdb connection to port\n"
> >@@ -4062,6 +4072,9 @@ enum {
> >     QEMU_OPTION_monitor,
> >     QEMU_OPTION_serial,
> >     QEMU_OPTION_parallel,
> >+#if defined(CONFIG_SLIRP)
> >+    QEMU_OPTION_vmchannel,
> >+#endif
> >  
> 
> I think this would make more sense as an option to -net user.  For instance:
> 
> -net user,port=1024,chardev=unix:foo.sock
> 
> Not the best syntax, but you get the idea.  What do you think?
> 
> It may be useful to use this functionality for other things too.

If I'm understanding correctly, the VM channel stuff has a hard
requirement for Slirp/user net setup, so could you just go one
step further and use the full char device syntax with -net, thus
eliminating the redundant 'user:' bit ?

   -net char:[CHAR-DEV-OPTIONS],port=1024

Or

   -net vmchan:[CHAR-DEV-OPTIONS],port=1024

Where 'CHAR-DEV-OPTIONS' is any of the stuff valid for -serial/-parallal
char device options 

Daniel
-- 
|: Red Hat, Engineering, London   -o-   http://people.redhat.com/berrange/ :|
|: http://libvirt.org  -o-  http://virt-manager.org  -o-  http://ovirt.org :|
|: http://autobuild.org       -o-         http://search.cpan.org/~danberr/ :|
|: GnuPG: 7D3B9505  -o-  F3C9 553F A1DA 4AC2 5648 23C1 B3DF F742 7D3B 9505 :|