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+virtio-serial loses writes when used over virtio-mmio
+
+virtio-serial appears to lose writes, but only when used on top of virtio-mmio.  The scenario is this:
+
+/home/rjones/d/qemu/arm-softmmu/qemu-system-arm \
+    -global virtio-blk-device.scsi=off \
+    -nodefconfig \
+    -nodefaults \
+    -nographic \
+    -M vexpress-a15 \
+    -machine accel=kvm:tcg \
+    -m 500 \
+    -no-reboot \
+    -kernel /home/rjones/d/libguestfs/tmp/.guestfs-1001/kernel.27944 \
+    -dtb /home/rjones/d/libguestfs/tmp/.guestfs-1001/dtb.27944 \
+    -initrd /home/rjones/d/libguestfs/tmp/.guestfs-1001/initrd.27944 \
+    -device virtio-scsi-device,id=scsi \
+    -drive file=/home/rjones/d/libguestfs/tmp/libguestfsLa9dE2/scratch.1,cache=unsafe,format=raw,id=hd0,if=none \
+    -device scsi-hd,drive=hd0 \
+    -drive file=/home/rjones/d/libguestfs/tmp/.guestfs-1001/root.27944,snapshot=on,id=appliance,cache=unsafe,if=none \
+    -device scsi-hd,drive=appliance \
+    -device virtio-serial-device \
+    -serial stdio \
+    -chardev socket,path=/home/rjones/d/libguestfs/tmp/libguestfsLa9dE2/guestfsd.sock,id=channel0 \
+    -device virtserialport,chardev=channel0,name=org.libguestfs.channel.0 \
+    -append 'panic=1 mem=500M console=ttyAMA0 udevtimeout=600 no_timer_check acpi=off printk.time=1 cgroup_disable=memory root=/dev/sdb selinux=0 guestfs_verbose=1 TERM=xterm-256color'
+
+After the guest starts up, a daemon writes 4 bytes to a virtio-serial socket.  The host side reads these 4 bytes correctly and writes a 64 byte message.  The guest never sees this message.
+
+I enabled virtio-mmio debugging, and this is what is printed (## = my comment):
+
+## guest opens the socket:
+trying to open virtio-serial channel '/dev/virtio-ports/org.libguestfs.channel.0'
+virtio_mmio: virtio_mmio_write offset 0x50 value 0x3
+opened the socket, sock = 3
+udevadm settle
+## guest writes 4 bytes to the socket:
+virtio_mmio: virtio_mmio_write offset 0x50 value 0x5
+virtio_mmio: virtio_mmio setting IRQ 1
+virtio_mmio: virtio_mmio_read offset 0x60
+virtio_mmio: virtio_mmio_write offset 0x64 value 0x1
+virtio_mmio: virtio_mmio setting IRQ 0
+sent magic GUESTFS_LAUNCH_FLAG
+## host reads 4 bytes successfully:
+main_loop libguestfs: recv_from_daemon: received GUESTFS_LAUNCH_FLAG
+libguestfs: [14605ms] appliance is up
+Guest launched OK.
+## host writes 64 bytes to socket:
+libguestfs: writing the data to the socket (size = 64)
+waiting for next request
+libguestfs: data written OK
+## hangs here forever with guest in read() call never receiving any data
+
+I am using qemu from git today (2d1fe1873a984).
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