Dor Laor wrote:
Passera, Pablo R wrote:
Hi all,
I am trying to communicate two VMs using a virtio driver.
Once a data is moved to the driver I want to notify the other Qemu
process that there is new data available in the buffer. I was
thinking about using linux signals to synchronize both processes but
when I register my SIGUSR1 handler in Qemu I am seeing an strange
behavior. After starting the VM and Linux gets loaded, Qemu is
receiving SIGUSR2 at a regular time period. Looking a little bit at
the code I realize that signals are being used for other purposes in
Qemu, however, SIGUSR1 is not used. Is it possible to use signals to
synchronize these processes or should I think about using a different
mechanism?
SIGUSR2 is used as aio completion signal. You can use SIGUSR1 but you
need to know what you're doing (some threads block signals).
Better fit would be a pipe.
Or even a unix domain socket.
Regards,
Anthony Liguori
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