virtio-serial: Add a 'virtserialport' device for generic serial port support
This commit adds a simple chardev-based serial port. Any data the guest sends is forwarded to the chardev and vice-versa. Sample uses for such a device can be obtaining info from the guest like the file systems used, apps installed, etc. for offline usage and logged-in users, clipboard copy-paste, etc. for online usage. Signed-off-by: NAmit Shah <amit.shah@redhat.com> Signed-off-by: NAnthony Liguori <aliguori@us.ibm.com>
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