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Description of problem:
when starting guest with two serial options, it works well. However, when starting guest with more than two serial options, guest fails with error:isa irq 4 already assigned. Also, man qemu-kvm says "this option can be used several times to simulate up to 4 serial ports."

Version-Release number of selected component (if applicable):
# uname -r
  2.6.32-220.el6.x86_64
# rpm -qa| grep qemu-kvm
  qemu-kvm-0.12.1.2-2.213.el6.x86_64

How reproducible:
100%


Steps to Reproduce:
1.boot a guest with two serial options
/usr/libexec/qemu-kvm -serial stdio -serial unix:/tmp/example,server,nowait
2.two serials work well
3.boot a guest with more than two serial options
/usr/libexec/qemu-kvm -serial stdio -serial unix:/tmp/example1,server,nowait -serial unix:/tmp/example2,server,nowait
4.guest fails with error:isa irq 4 already assigned
  
Expected results:
qemu-kvm should support 4 serial devices.

Additional info:

Created attachment 597855 [details]
Patch from Gerd Hoffmann

Verified with qemu-kvm-rhev-0.12.1.2-2.331.el6.x86_64:

[root@localhost nfs]# /usr/libexec/qemu-kvm -serial stdio -serial unix:/tmp/example1,server,nowait -serial unix:/tmp/example2,server,nowait
VNC server running on `::1:5900'

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

http://rhn.redhat.com/errata/RHBA-2013-0527.html