ANDROID: kvm: arm64: start hypervisor event IDs from 1

IDs of tracing events are expected to be positive integers, hence this
patch. This is a quick fix to make sure that hypervisor tracing works,
while the proper solution that avoids ID collision is being worked on.

Bug: 428904926
Test: presubmit
Change-Id: I95459cbf32466351b6a539ea2111e8d091291c2b
Signed-off-by: Nikita Ioffe <ioffe@google.com>

arch/arm64/kvm/hyp_events.c

@@ -250,7 +250,10 @@ bool hyp_trace_init_event_early(void)
 }
 
 static struct dentry *event_tracefs;
-static unsigned int last_event_id;
+// Event IDs should be positive integers, hence starting from 1 here.
+// NOTE: this introduces ID clash between hypervisor events and kernel events.
+// For now this doesn't seem to cause problems, but we should fix it...
+static unsigned int last_event_id = 1;
 
 struct hyp_event_table {
 	struct hyp_event	*start;