ARM: KVM: Enable in-kernel timers with user space gic

When running with KVM enabled, you can choose between emulating the
gic in kernel or user space. If the kernel supports in-kernel virtualization
of the interrupt controller, it will default to that. If not, if will
default to user space emulation.

Unfortunately when running in user mode gic emulation, we miss out on
interrupt events which are only available from kernel space, such as the timer.
This patch leverages the new kernel/user space pending line synchronization for
timer events. It does not handle PMU events yet.

Signed-off-by: Alexander Graf <agraf@suse.de>
Reviewed-by: Andrew Jones <drjones@redhat.com>
Message-id: 1498577737-130264-1-git-send-email-agraf@suse.de
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

accel/stubs/kvm-stub.c

@@ -155,4 +155,9 @@ void kvm_init_cpu_signals(CPUState *cpu)
 {
     abort();
 }
+
+bool kvm_arm_supports_user_irq(void)
+{
+    return false;
+}
 #endif