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backends: Introduce chr-testdev

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From: Paolo Bonzini <pbonzini@redhat.com>

chr-testdev enables a virtio serial channel to be used for guest
initiated qemu exits. hw/misc/debugexit already enables guest
initiated qemu exits, but only for PC targets. chr-testdev supports
any virtio-capable target. kvm-unit-tests/arm is already making use
of this backend.

Currently there is a single command implemented, "q".  It takes a
(prefix) argument for the exit code, thus an exit is implemented by
writing, e.g. "1q", to the virtio-serial port.

It can be used as:
   $QEMU ... \
     -device virtio-serial-device \
     -device virtserialport,chardev=ctd -chardev testdev,id=ctd

or, use:
   $QEMU ... \
     -device virtio-serial-device \
     -device virtconsole,chardev=ctd -chardev testdev,id=ctd

to bind it to virtio-serial port0.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Andrew Jones <drjones@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini 2014-07-11 09:44:26 +02:00
parent 41a1a9c42c
commit 5692399f0a
7 changed files with 149 additions and 2 deletions
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1
stubs/Makefile.objs
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@ -2,6 +2,7 @@ stub-obj-y += arch-query-cpu-def.o
stub-obj-y += bdrv-commit-all.o
stub-obj-y += chr-baum-init.o
stub-obj-y += chr-msmouse.o
stub-obj-y += chr-testdev.o
stub-obj-y += clock-warp.o
stub-obj-y += cpu-get-clock.o
stub-obj-y += cpu-get-icount.o