Description of problem:
In bug 772194 some counters were added to the kernel code then to check the bytes sent, received and discarded values during virtio serial communication.

File this bug for the host qemu part, 

For testing, do this in the guest:
(qemu)info qtree should show something like:

(qemu) info qtree
dev: virtserialport, id "port0"
            dev-prop: nr = 1
            dev-prop: chardev = channel0
            dev-prop: name = "org.linux-kvm.port.0"
            port 1, guest off, host on, throttle off, bytes_sent 0,
bytes_received 3085535232, bytes_discarded: 6229302441870433721


Version-Release number of selected component (if applicable):
qemu-kvm-0.12.1.2-2.230.el6.x86_64

How reproducible:
Always

Steps to Reproduce:
1. find out the size of the original file (ls -l) in the guest.

2. start transmit of file from guest->host, perform Ctrl+C and redirect to new
file

3. check file sizes of the two host files, add them.

4. check 'bytes_received' value in 'info qtree' output.

5. check 'bytes_discarded' value in 'info qtree' output.

6. check 'bytes_sent' value in GUEST debugfs port

7. Add numbers in step 3 and step 5.

8. Verify: number in step 6 is same as number in step 1

9. Verify: number in step 6 is same as number in step 4

10. Verify: number in step 7 is equal to or slightly less than step 1.  The
number might be slightly lesser since the bytes may have been discarded by
qemu's chardev layer and not virtio-serial.


Actual results:


Expected results:
If all this matches, everything works according to expectation.

Additional info: