Send magic-sysrq from virtual serial console?

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I am using CentOS 5.6 as a KVM host.   My guests are running CentOS
5.6 with the only console being a virtual serial console.  The guests
are configured so magic-sysreq can be used to debug kernel issues.


However, in order to send magic-sysrq from a serial port, I need to
send a break.   How does one send a break on the virtual console
serial port provided by KVM/libvirt to guests?

Thanks,
   David
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