perf intel-pt: Allow for a guest kernel address filter

Handling TIP.PGD for an address filter for a guest kernel is the same as a
host kernel, but user space decoding, and hence address filters, are not
supported.
Signed-off-by: NAdrian Hunter <adrian.hunter@intel.com>
Acked-by: NAndi Kleen <ak@linux.intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Link: https://lore.kernel.org/r/20210218095801.19576-9-adrian.hunter@intel.comSigned-off-by: NArnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/util/intel-pt.c

@@ -792,8 +792,14 @@ static int __intel_pt_pgd_ip(uint64_t ip, void *data)
 	u8 cpumode;
 	u64 offset;
 
-	if (ip >= ptq->pt->kernel_start)
+	if (ptq->state->to_nr) {
+		if (intel_pt_guest_kernel_ip(ip))
+			return intel_pt_match_pgd_ip(ptq->pt, ip, ip, NULL);
+		/* No support for decoding guest user space */
+		return -EINVAL;
+	} else if (ip >= ptq->pt->kernel_start) {
 		return intel_pt_match_pgd_ip(ptq->pt, ip, ip, NULL);
+	}
 
 	cpumode = PERF_RECORD_MISC_USER;