Re: spawn second serial console/port

[Vasiliy G Tolstov <v.tolstov@selfip.ru>]

On Fri, 2010-11-12 at 13:19 +0000, Stefano Stabellini wrote:
> On Thu, 11 Nov 2010, Vasiliy G Tolstov wrote:
> > I need second serial port (hvc1) how can i spawn it to connect from dom0
> > to domU ?
> > 
> > Can it possible without modification of xen sources? Odes it possible to
> > write something in config file of domU?
> > 
> > If it not possible to do without modification of source code, can You
> > take me some info, what file/files i need to review?
> > 
> 
> it is possible and most of the code is out there somewhere but it won't
> work out of the box.
> 
> First you need yo checkout this branch:
> 
> git://xenbits.xen.org/people/sstabellini/linux-pvhvm.git 2.6.35-rc5-pvhvm-v7
> 
> give a look at 8d380069c8a00f89acb43f7c7b3a7fc4357a5cac and
> 0d5aa905d52d960ca25f5adccec7fda9fd7e8a78, they implement PV multiconsole
> support in the kernel (these commits are not upstream yet).
> 
> Then you need to edit xl to add a second PV console (it is not possible
> to do that from the VM config file), a quick hack like this should work:
> 
> 
> diff -r 388c44a63613 tools/libxl/xl_cmdimpl.c
> --- a/tools/libxl/xl_cmdimpl.c	Wed Nov 10 14:56:06 2010 +0000
> +++ b/tools/libxl/xl_cmdimpl.c	Fri Nov 12 13:17:24 2010 +0000
> @@ -1686,13 +1686,17 @@ start:
>  
>          init_console_info(&console, 0, &state);
>          console.domid = domid;
> -        if (d_config.num_vfbs)
> -             console.consback = LIBXL_CONSBACK_IOEMU;
> +        console.consback = LIBXL_CONSBACK_IOEMU;
>          libxl_device_console_add(&ctx, domid, &console);
>          libxl_device_console_destroy(&console);
>  
> -        if (d_config.num_vfbs)
> -            libxl_create_xenpv_qemu(&ctx, domid, d_config.vfbs, &dm_starting);
> +        init_console_info(&console, 1, NULL);
> +        console.domid = domid;
> +        console.consback = LIBXL_CONSBACK_IOEMU;
> +        libxl_device_console_add(&ctx, domid, &console);
> +        libxl_device_console_destroy(&console);
> +
> +        libxl_create_xenpv_qemu(&ctx, domid, d_config.vfbs, &dm_starting);
>      }
>  
>      if (dm_starting)
> 
> 
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Sorry, but we use SLES =( 
Can it possible to use without xl, for example with libxen ? (I can
change the kernel, but change userspace is probably very hard to do...)

-- 
Vasiliy G Tolstov <v.tolstov@selfip.ru>
Selfip.Ru