ANDROID: arm64: Call fixup_exception() within do_sea()

path_lookupat() is capable of safely reading unampped VAs. If an
unmapped VA is read whilst the function is being called, the resulting
page fault will get re-directed to __do_page_fault(), which will call
fixup_exception() to handle the aforementioned unmapped VA read.

Now, for an OS running in a VM, let's say that memory was still mapped
at S1 but lent to another VM (i.e. unmapped at S2 for the given VM).
The reading of an unmapped VA in path_lookupat() still needs to be
handled. For hypervisors that inject an abort leading to a do_sea()
call, call fixup_exception() from do_sea() if
trace_android_vh_try_fixup_sea() indicates that we can do so.

Bug: 320358381
Change-Id: I0aedcd954f08e3011b27524f9a7b038debbb246d
Signed-off-by: Chris Goldsworthy <quic_cgoldswo@quicinc.com>

include/trace/hooks/fault.h

@@ -40,6 +40,11 @@ DECLARE_HOOK(android_vh_handle_tlb_conf,
 
 /* macro versions of hooks are no longer required */
 
+DECLARE_HOOK(android_vh_try_fixup_sea,
+	TP_PROTO(unsigned long addr, unsigned long esr, struct pt_regs *regs,
+		 bool *can_fixup),
+	TP_ARGS(addr, esr, regs, can_fixup));
+
 #endif /* _TRACE_HOOK_FAULT_H */
 /* This part must be outside protection */
 #include <trace/define_trace.h>