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switch chardev to QemuOpts: infrastructure, null device

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start switching chardevs to QemuOpts.  This patch adds the
infrastructure and converts the null device.

The patch brings two new functions:

qemu_chr_open_opts()
	same as qemu_chr_open(), but uses QemuOpts instead of a
	option char string.

qemu_chr_parse_compat()
	accepts a traditional chardev option string, returns the
	corresponding QemuOpts instance, to handle backward
	compatibility.

The patch also adds a new -chardev switch which can be used to create
named+unconnected chardevs, like this:

	-chardev null,id=test

This uses the new qemu_chr_open_opts.  Thus with this patch alone only
the null device works.  The other devices will follow ...

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
This commit is contained in:
Gerd Hoffmann 2009-09-10 10:58:35 +02:00 • committed by Anthony Liguori
parent 9d868d4517
commit 191bc01bc9
6 changed files with 93 additions and 4 deletions
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2
qemu-options.hx
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@ -1195,6 +1195,8 @@ STEXI
@table @option
ETEXI
DEF("chardev", HAS_ARG, QEMU_OPTION_chardev, \
"-chardev spec create unconnected chardev\n")
DEF("serial", HAS_ARG, QEMU_OPTION_serial, \
"-serial dev redirect the serial port to char device 'dev'\n")
STEXI