kvm: consume internal signal with sigtimedwait
Change the way the internal qemu signal, used for communication between iothread and vcpus, is handled. Block and consume it with sigtimedwait on the outer vcpu loop, which allows more precise timing control. Change from standard signal (SIGUSR1) to real-time one, so multiple signals are not collapsed. Set the signal number on KVM's in-kernel allowed sigmask. Signed-off-by: NMarcelo Tosatti <mtosatti@redhat.com> Signed-off-by: NAvi Kivity <avi@redhat.com>
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