perf buildid-cache: Add guestmount'd files to the build ID cache

When the guestmount option is used, a guest machine's file system mount
point is recorded in machine->root_dir.

perf already iterates guest machines when adding files to the build ID
cache, but does not take machine->root_dir into account.

Use machine->root_dir to find files for guest build IDs, and add them to
the build ID cache using the "proper" name i.e. relative to the guest root
directory not the host root directory.

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Acked-by: Ian Rogers <irogers@google.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: kvm@vger.kernel.org
Link: https://lore.kernel.org/r/20220711093218.10967-9-adrian.hunter@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

1 files changed, 51 insertions, 16 deletions

diff --git a/tools/perf/util/build-id.c b/tools/perf/util/build-id.c
index 4c9093b64d1f..7c9f441936ee 100644
--- a/tools/perf/util/build-id.c
+++ b/tools/perf/util/build-id.c
@@ -625,9 +625,12 @@ static int build_id_cache__add_sdt_cache(const char *sbuild_id,
 #endif
 
 static char *build_id_cache__find_debug(const char *sbuild_id,
-					struct nsinfo *nsi)
+					struct nsinfo *nsi,
+					const char *root_dir)
 {
+	const char *dirname = "/usr/lib/debug/.build-id/";
 	char *realname = NULL;
+	char dirbuf[PATH_MAX];
 	char *debugfile;
 	struct nscookie nsc;
 	size_t len = 0;
@@ -636,8 +639,12 @@ static char *build_id_cache__find_debug(const char *sbuild_id,
 	if (!debugfile)
 		goto out;
 
-	len = __symbol__join_symfs(debugfile, PATH_MAX,
-				   "/usr/lib/debug/.build-id/");
+	if (root_dir) {
+		path__join(dirbuf, PATH_MAX, root_dir, dirname);
+		dirname = dirbuf;
+	}
+
+	len = __symbol__join_symfs(debugfile, PATH_MAX, dirname);
 	snprintf(debugfile + len, PATH_MAX - len, "%.2s/%s.debug", sbuild_id,
 		 sbuild_id + 2);
 
@@ -668,14 +675,18 @@ out:
 
 int
 build_id_cache__add(const char *sbuild_id, const char *name, const char *realname,
-		    struct nsinfo *nsi, bool is_kallsyms, bool is_vdso)
+		    struct nsinfo *nsi, bool is_kallsyms, bool is_vdso,
+		    const char *proper_name, const char *root_dir)
 {
 	const size_t size = PATH_MAX;
 	char *filename = NULL, *dir_name = NULL, *linkname = zalloc(size), *tmp;
 	char *debugfile = NULL;
 	int err = -1;
 
-	dir_name = build_id_cache__cachedir(sbuild_id, name, nsi, is_kallsyms,
+	if (!proper_name)
+		proper_name = name;
+
+	dir_name = build_id_cache__cachedir(sbuild_id, proper_name, nsi, is_kallsyms,
 					    is_vdso);
 	if (!dir_name)
 		goto out_free;
@@ -715,7 +726,7 @@ build_id_cache__add(const char *sbuild_id, const char *name, const char *realnam
 	 */
 	if (!is_kallsyms && !is_vdso &&
 	    strncmp(".ko", name + strlen(name) - 3, 3)) {
-		debugfile = build_id_cache__find_debug(sbuild_id, nsi);
+		debugfile = build_id_cache__find_debug(sbuild_id, nsi, root_dir);
 		if (debugfile) {
 			zfree(&filename);
 			if (asprintf(&filename, "%s/%s", dir_name,
@@ -781,8 +792,9 @@ out_free:
 	return err;
 }
 
-int build_id_cache__add_s(const char *sbuild_id, const char *name,
-			  struct nsinfo *nsi, bool is_kallsyms, bool is_vdso)
+int __build_id_cache__add_s(const char *sbuild_id, const char *name,
+			    struct nsinfo *nsi, bool is_kallsyms, bool is_vdso,
+			    const char *proper_name, const char *root_dir)
 {
 	char *realname = NULL;
 	int err = -1;
@@ -796,8 +808,8 @@ int build_id_cache__add_s(const char *sbuild_id, const char *name,
 			goto out_free;
 	}
 
-	err = build_id_cache__add(sbuild_id, name, realname, nsi, is_kallsyms, is_vdso);
-
+	err = build_id_cache__add(sbuild_id, name, realname, nsi,
+				  is_kallsyms, is_vdso, proper_name, root_dir);
 out_free:
 	if (!is_kallsyms)
 		free(realname);
@@ -806,14 +818,16 @@ out_free:
 
 static int build_id_cache__add_b(const struct build_id *bid,
 				 const char *name, struct nsinfo *nsi,
-				 bool is_kallsyms, bool is_vdso)
+				 bool is_kallsyms, bool is_vdso,
+				 const char *proper_name,
+				 const char *root_dir)
 {
 	char sbuild_id[SBUILD_ID_SIZE];
 
 	build_id__sprintf(bid, sbuild_id);
 
-	return build_id_cache__add_s(sbuild_id, name, nsi, is_kallsyms,
-				     is_vdso);
+	return __build_id_cache__add_s(sbuild_id, name, nsi, is_kallsyms,
+				       is_vdso, proper_name, root_dir);
 }
 
 bool build_id_cache__cached(const char *sbuild_id)
@@ -896,6 +910,10 @@ static int dso__cache_build_id(struct dso *dso, struct machine *machine,
 	bool is_kallsyms = dso__is_kallsyms(dso);
 	bool is_vdso = dso__is_vdso(dso);
 	const char *name = dso->long_name;
+	const char *proper_name = NULL;
+	const char *root_dir = NULL;
+	char *allocated_name = NULL;
+	int ret = 0;
 
 	if (!dso->has_build_id)
 		return 0;
@@ -905,11 +923,28 @@ static int dso__cache_build_id(struct dso *dso, struct machine *machine,
 		name = machine->mmap_name;
 	}
 
+	if (!machine__is_host(machine)) {
+		if (*machine->root_dir) {
+			root_dir = machine->root_dir;
+			ret = asprintf(&allocated_name, "%s/%s", root_dir, name);
+			if (ret < 0)
+				return ret;
+			proper_name = name;
+			name = allocated_name;
+		} else if (is_kallsyms) {
+			/* Cannot get guest kallsyms */
+			return 0;
+		}
+	}
+
 	if (!is_kallsyms && dso__build_id_mismatch(dso, name))
-		return 0;
+		goto out_free;
 
-	return build_id_cache__add_b(&dso->bid, name, dso->nsinfo,
-				     is_kallsyms, is_vdso);
+	ret = build_id_cache__add_b(&dso->bid, name, dso->nsinfo,
+				    is_kallsyms, is_vdso, proper_name, root_dir);
+out_free:
+	free(allocated_name);
+	return ret;
 }
 
 static int