perf intel-pt: Fix exclude_guest setting

In the past, the exclude_guest setting has had no effect on Intel PT
tracing, but that may not be the case in the future.

Set the flag correctly based upon whether KVM is using Intel PT
"Host/Guest" mode, which is determined by the kvm_intel module
parameter pt_mode:

pt_mode=0 System-wide mode : host and guest output to host buffer
pt_mode=1 Host/Guest mode : host/guest output to host/guest
buffers respectively

Fixes: 6e86bfdc4a60 ("perf intel-pt: Support decoding of guest kernel")
Signed-off-by: Adrian Hunter <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Namhyung Kim <[e-mail]>

tools/perf/arch/x86/util/intel-pt.c

···
 #include "../../../util/tsc.h"
 #include <internal/lib.h> // page_size
 #include "../../../util/intel-pt.h"
+#include <api/fs/fs.h>
 
 #define KiB(x) ((x) * 1024)
 #define MiB(x) ((x) * 1024 * 1024)
···
 }
 #endif
 
+static bool intel_pt_exclude_guest(void)
+{
+	int pt_mode;
+
+	if (sysfs__read_int("module/kvm_intel/parameters/pt_mode", &pt_mode))
+		pt_mode = 0;
+
+	return pt_mode == 1;
+}
+
 static void intel_pt_valid_str(char *str, size_t len, u64 valid)
 {
 	unsigned int val, last = 0, state = 1;
···
 			}
 			evsel->core.attr.freq = 0;
 			evsel->core.attr.sample_period = 1;
+			evsel->core.attr.exclude_guest = intel_pt_exclude_guest();
 			evsel->no_aux_samples = true;
 			evsel->needs_auxtrace_mmap = true;
 			intel_pt_evsel = evsel;