[Qemu-devel] Re: [FOR 0.12 PATCH v3 05/21] default devices: core code & serial lines.

[Alexander Graf <agraf@suse.de>]

On 07.12.2009, at 13:42, Gerd Hoffmann wrote:

> Qemu creates a default serial line for you in case you didn't specify
> one on the command line.  Right now this is tied to the '-serial
> <chardev>' command line switch, which in turn causes trouble if you are
> creating your serial line via '-device isa-serial,<props>'.
> 
> This patch adds a variable default_serial which says whenever a default
> serial line should be added.  It is enabled by default.  It is cleared
> when qemu finds '-serial' or '-device isa-serial' on the command line.
> 
> Part of the patch is some infrastructure for the '-device $driver'
> checking (default_driver_check function) which will also be used by the
> other patches of this series.
> 
> Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
> ---
> vl.c |  122 +++++++++++++++++++++++++++++++++++++++++++----------------------
> 1 files changed, 81 insertions(+), 41 deletions(-)
> 
> diff --git a/vl.c b/vl.c
> index 24d5d92..eca4eee 100644
> --- a/vl.c
> +++ b/vl.c
> @@ -271,6 +271,30 @@ uint8_t qemu_uuid[16];
> static QEMUBootSetHandler *boot_set_handler;
> static void *boot_set_opaque;
> 
> +static int default_serial = 1;

Default variables belong in the machine description IMHO. On S390, we can't create serial, parallel or vga (or any MMIO/PIO requiring) devices.

Alex