diff --git a/tools/perf/builtin-annotate.c b/tools/perf/builtin-annotate.c
index f924b43..986b2ef 100644
--- a/tools/perf/builtin-annotate.c
+++ b/tools/perf/builtin-annotate.c
@@ -571,7 +571,7 @@
 		perf_session__fprintf(session, stdout);
 
 	if (verbose > 2)
-		dsos__fprintf(&session->kerninfo_root, stdout);
+		dsos__fprintf(&session->machines, stdout);
 
 	perf_session__collapse_resort(&session->hists);
 	perf_session__output_resort(&session->hists, session->event_total[0]);
diff --git a/tools/perf/builtin-buildid-list.c b/tools/perf/builtin-buildid-list.c
index 623afe3..b4a265a 100644
--- a/tools/perf/builtin-buildid-list.c
+++ b/tools/perf/builtin-buildid-list.c
@@ -46,7 +46,7 @@
 	if (with_hits)
 		perf_session__process_events(session, &build_id__mark_dso_hit_ops);
 
-	dsos__fprintf_buildid(&session->kerninfo_root, stdout, with_hits);
+	dsos__fprintf_buildid(&session->machines, stdout, with_hits);
 
 	perf_session__delete(session);
 	return err;
diff --git a/tools/perf/builtin-kmem.c b/tools/perf/builtin-kmem.c
index ab906cb..2067475 100644
--- a/tools/perf/builtin-kmem.c
+++ b/tools/perf/builtin-kmem.c
@@ -352,7 +352,7 @@
 			   int n_lines, int is_caller)
 {
 	struct rb_node *next;
-	struct kernel_info *kerninfo;
+	struct machine *machine;
 
 	printf("%.102s\n", graph_dotted_line);
 	printf(" %-34s |",  is_caller ? "Callsite": "Alloc Ptr");
@@ -361,8 +361,8 @@
 
 	next = rb_first(root);
 
-	kerninfo = kerninfo__findhost(&session->kerninfo_root);
-	if (!kerninfo) {
+	machine = perf_session__find_host_machine(session);
+	if (!machine) {
 		pr_err("__print_result: couldn't find kernel information\n");
 		return;
 	}
@@ -370,7 +370,7 @@
 		struct alloc_stat *data = rb_entry(next, struct alloc_stat,
 						   node);
 		struct symbol *sym = NULL;
-		struct map_groups *kmaps = &kerninfo->kmaps;
+		struct map_groups *kmaps = &machine->kmaps;
 		struct map *map;
 		char buf[BUFSIZ];
 		u64 addr;
diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
index 27f992a..83b308a 100644
--- a/tools/perf/builtin-record.c
+++ b/tools/perf/builtin-record.c
@@ -456,14 +456,14 @@
 	}
 }
 
-static void event__synthesize_guest_os(struct kernel_info *kerninfo,
-		void *data __attribute__((unused)))
+static void event__synthesize_guest_os(struct machine *machine, void *data)
 {
 	int err;
 	char *guest_kallsyms;
 	char path[PATH_MAX];
+	struct perf_session *psession = data;
 
-	if (is_host_kernel(kerninfo))
+	if (machine__is_host(machine))
 		return;
 
 	/*
@@ -475,16 +475,15 @@
 	 *in module instead of in guest kernel.
 	 */
 	err = event__synthesize_modules(process_synthesized_event,
-			session,
-			kerninfo);
+					psession, machine);
 	if (err < 0)
 		pr_err("Couldn't record guest kernel [%d]'s reference"
-			" relocation symbol.\n", kerninfo->pid);
+		       " relocation symbol.\n", machine->pid);
 
-	if (is_default_guest(kerninfo))
+	if (machine__is_default_guest(machine))
 		guest_kallsyms = (char *) symbol_conf.default_guest_kallsyms;
 	else {
-		sprintf(path, "%s/proc/kallsyms", kerninfo->root_dir);
+		sprintf(path, "%s/proc/kallsyms", machine->root_dir);
 		guest_kallsyms = path;
 	}
 
@@ -493,13 +492,13 @@
 	 * have no _text sometimes.
 	 */
 	err = event__synthesize_kernel_mmap(process_synthesized_event,
-			session, kerninfo, "_text");
+					    psession, machine, "_text");
 	if (err < 0)
 		err = event__synthesize_kernel_mmap(process_synthesized_event,
-				session, kerninfo, "_stext");
+						    psession, machine, "_stext");
 	if (err < 0)
 		pr_err("Couldn't record guest kernel [%d]'s reference"
-			" relocation symbol.\n", kerninfo->pid);
+		       " relocation symbol.\n", machine->pid);
 }
 
 static int __cmd_record(int argc, const char **argv)
@@ -513,7 +512,7 @@
 	int child_ready_pipe[2], go_pipe[2];
 	const bool forks = argc > 0;
 	char buf;
-	struct kernel_info *kerninfo;
+	struct machine *machine;
 
 	page_size = sysconf(_SC_PAGE_SIZE);
 
@@ -682,31 +681,30 @@
 		advance_output(err);
 	}
 
-	kerninfo = kerninfo__findhost(&session->kerninfo_root);
-	if (!kerninfo) {
+	machine = perf_session__find_host_machine(session);
+	if (!machine) {
 		pr_err("Couldn't find native kernel information.\n");
 		return -1;
 	}
 
 	err = event__synthesize_kernel_mmap(process_synthesized_event,
-			session, kerninfo, "_text");
+					    session, machine, "_text");
 	if (err < 0)
 		err = event__synthesize_kernel_mmap(process_synthesized_event,
-				session, kerninfo, "_stext");
+						    session, machine, "_stext");
 	if (err < 0) {
 		pr_err("Couldn't record kernel reference relocation symbol.\n");
 		return err;
 	}
 
 	err = event__synthesize_modules(process_synthesized_event,
-				session, kerninfo);
+					session, machine);
 	if (err < 0) {
 		pr_err("Couldn't record kernel reference relocation symbol.\n");
 		return err;
 	}
 	if (perf_guest)
-		kerninfo__process_allkernels(&session->kerninfo_root,
-			event__synthesize_guest_os, session);
+		perf_session__process_machines(session, event__synthesize_guest_os);
 
 	if (!system_wide && profile_cpu == -1)
 		event__synthesize_thread(target_tid, process_synthesized_event,
diff --git a/tools/perf/builtin-report.c b/tools/perf/builtin-report.c
index 816edae..49cc367 100644
--- a/tools/perf/builtin-report.c
+++ b/tools/perf/builtin-report.c
@@ -313,7 +313,7 @@
 		perf_session__fprintf(session, stdout);
 
 	if (verbose > 2)
-		dsos__fprintf(&session->kerninfo_root, stdout);
+		dsos__fprintf(&session->machines, stdout);
 
 	next = rb_first(&session->stats_by_id);
 	while (next) {
diff --git a/tools/perf/builtin-top.c b/tools/perf/builtin-top.c
index dfd7ea7..c390f34 100644
--- a/tools/perf/builtin-top.c
+++ b/tools/perf/builtin-top.c
@@ -854,7 +854,7 @@
 		case 'Q':
 			printf("exiting.\n");
 			if (dump_symtab)
-				dsos__fprintf(&session->kerninfo_root, stderr);
+				dsos__fprintf(&session->machines, stderr);
 			exit(0);
 		case 's':
 			prompt_symbol(&sym_filter_entry, "Enter details symbol");
@@ -982,7 +982,7 @@
 	u64 ip = self->ip.ip;
 	struct sym_entry *syme;
 	struct addr_location al;
-	struct kernel_info *kerninfo;
+	struct machine *machine;
 	u8 origin = self->header.misc & PERF_RECORD_MISC_CPUMODE_MASK;
 
 	++samples;
@@ -992,18 +992,17 @@
 		++us_samples;
 		if (hide_user_symbols)
 			return;
-		kerninfo = kerninfo__findhost(&session->kerninfo_root);
+		machine = perf_session__find_host_machine(session);
 		break;
 	case PERF_RECORD_MISC_KERNEL:
 		++kernel_samples;
 		if (hide_kernel_symbols)
 			return;
-		kerninfo = kerninfo__findhost(&session->kerninfo_root);
+		machine = perf_session__find_host_machine(session);
 		break;
 	case PERF_RECORD_MISC_GUEST_KERNEL:
 		++guest_kernel_samples;
-		kerninfo = kerninfo__find(&session->kerninfo_root,
-					  self->ip.pid);
+		machine = perf_session__find_machine(session, self->ip.pid);
 		break;
 	case PERF_RECORD_MISC_GUEST_USER:
 		++guest_us_samples;
@@ -1016,7 +1015,7 @@
 		return;
 	}
 
-	if (!kerninfo && perf_guest) {
+	if (!machine && perf_guest) {
 		pr_err("Can't find guest [%d]'s kernel information\n",
 			self->ip.pid);
 		return;
@@ -1041,7 +1040,7 @@
 		 * --hide-kernel-symbols, even if the user specifies an
 		 * invalid --vmlinux ;-)
 		 */
-		if (al.map == kerninfo->vmlinux_maps[MAP__FUNCTION] &&
+		if (al.map == machine->vmlinux_maps[MAP__FUNCTION] &&
 		    RB_EMPTY_ROOT(&al.map->dso->symbols[MAP__FUNCTION])) {
 			pr_err("The %s file can't be used\n",
 			       symbol_conf.vmlinux_name);
diff --git a/tools/perf/util/event.c b/tools/perf/util/event.c
index e3fa8d3..2f33ca9 100644
--- a/tools/perf/util/event.c
+++ b/tools/perf/util/event.c
@@ -172,17 +172,17 @@
 
 int event__synthesize_modules(event__handler_t process,
 			      struct perf_session *session,
-			      struct kernel_info *kerninfo)
+			      struct machine *machine)
 {
 	struct rb_node *nd;
-	struct map_groups *kmaps = &kerninfo->kmaps;
+	struct map_groups *kmaps = &machine->kmaps;
 	u16 misc;
 
 	/*
 	 * kernel uses 0 for user space maps, see kernel/perf_event.c
 	 * __perf_event_mmap
 	 */
-	if (is_host_kernel(kerninfo))
+	if (machine__is_host(machine))
 		misc = PERF_RECORD_MISC_KERNEL;
 	else
 		misc = PERF_RECORD_MISC_GUEST_KERNEL;
@@ -204,7 +204,7 @@
 				        (sizeof(ev.mmap.filename) - size));
 		ev.mmap.start = pos->start;
 		ev.mmap.len   = pos->end - pos->start;
-		ev.mmap.pid   = kerninfo->pid;
+		ev.mmap.pid   = machine->pid;
 
 		memcpy(ev.mmap.filename, pos->dso->long_name,
 		       pos->dso->long_name_len + 1);
@@ -267,7 +267,7 @@
 
 int event__synthesize_kernel_mmap(event__handler_t process,
 				  struct perf_session *session,
-				  struct kernel_info *kerninfo,
+				  struct machine *machine,
 				  const char *symbol_name)
 {
 	size_t size;
@@ -288,8 +288,8 @@
 	 */
 	struct process_symbol_args args = { .name = symbol_name, };
 
-	mmap_name = kern_mmap_name(kerninfo, name_buff);
-	if (is_host_kernel(kerninfo)) {
+	mmap_name = machine__mmap_name(machine, name_buff);
+	if (machine__is_host(machine)) {
 		/*
 		 * kernel uses PERF_RECORD_MISC_USER for user space maps,
 		 * see kernel/perf_event.c __perf_event_mmap
@@ -298,10 +298,10 @@
 		filename = "/proc/kallsyms";
 	} else {
 		ev.header.misc = PERF_RECORD_MISC_GUEST_KERNEL;
-		if (is_default_guest(kerninfo))
+		if (machine__is_default_guest(machine))
 			filename = (char *) symbol_conf.default_guest_kallsyms;
 		else {
-			sprintf(path, "%s/proc/kallsyms", kerninfo->root_dir);
+			sprintf(path, "%s/proc/kallsyms", machine->root_dir);
 			filename = path;
 		}
 	}
@@ -309,7 +309,7 @@
 	if (kallsyms__parse(filename, &args, find_symbol_cb) <= 0)
 		return -ENOENT;
 
-	map = kerninfo->vmlinux_maps[MAP__FUNCTION];
+	map = machine->vmlinux_maps[MAP__FUNCTION];
 	size = snprintf(ev.mmap.filename, sizeof(ev.mmap.filename),
 			"%s%s", mmap_name, symbol_name) + 1;
 	size = ALIGN(size, sizeof(u64));
@@ -318,7 +318,7 @@
 	ev.mmap.pgoff = args.start;
 	ev.mmap.start = map->start;
 	ev.mmap.len   = map->end - ev.mmap.start;
-	ev.mmap.pid   = kerninfo->pid;
+	ev.mmap.pid   = machine->pid;
 
 	return process(&ev, session);
 }
@@ -389,18 +389,18 @@
 {
 	struct map *map;
 	char kmmap_prefix[PATH_MAX];
-	struct kernel_info *kerninfo;
+	struct machine *machine;
 	enum dso_kernel_type kernel_type;
 	bool is_kernel_mmap;
 
-	kerninfo = kerninfo__findnew(&session->kerninfo_root, self->mmap.pid);
-	if (!kerninfo) {
-		pr_err("Can't find id %d's kerninfo\n", self->mmap.pid);
+	machine = perf_session__findnew_machine(session, self->mmap.pid);
+	if (!machine) {
+		pr_err("Can't find id %d's machine\n", self->mmap.pid);
 		goto out_problem;
 	}
 
-	kern_mmap_name(kerninfo, kmmap_prefix);
-	if (is_host_kernel(kerninfo))
+	machine__mmap_name(machine, kmmap_prefix);
+	if (machine__is_host(machine))
 		kernel_type = DSO_TYPE_KERNEL;
 	else
 		kernel_type = DSO_TYPE_GUEST_KERNEL;
@@ -429,10 +429,9 @@
 		} else
 			strcpy(short_module_name, self->mmap.filename);
 
-		map = map_groups__new_module(&kerninfo->kmaps,
-				self->mmap.start,
-				self->mmap.filename,
-				kerninfo);
+		map = map_groups__new_module(&machine->kmaps,
+					     self->mmap.start,
+					     self->mmap.filename, machine);
 		if (map == NULL)
 			goto out_problem;
 
@@ -449,27 +448,27 @@
 		 * Should be there already, from the build-id table in
 		 * the header.
 		 */
-		struct dso *kernel = __dsos__findnew(&kerninfo->dsos__kernel,
-				kmmap_prefix);
+		struct dso *kernel = __dsos__findnew(&machine->kernel_dsos,
+						     kmmap_prefix);
 		if (kernel == NULL)
 			goto out_problem;
 
 		kernel->kernel = kernel_type;
-		if (__map_groups__create_kernel_maps(&kerninfo->kmaps,
-					kerninfo->vmlinux_maps, kernel) < 0)
+		if (__map_groups__create_kernel_maps(&machine->kmaps,
+						     machine->vmlinux_maps,
+						     kernel) < 0)
 			goto out_problem;
 
-		event_set_kernel_mmap_len(kerninfo->vmlinux_maps, self);
-		perf_session__set_kallsyms_ref_reloc_sym(kerninfo->vmlinux_maps,
-				symbol_name,
-				self->mmap.pgoff);
-		if (is_default_guest(kerninfo)) {
+		event_set_kernel_mmap_len(machine->vmlinux_maps, self);
+		perf_session__set_kallsyms_ref_reloc_sym(machine->vmlinux_maps,
+							 symbol_name,
+							 self->mmap.pgoff);
+		if (machine__is_default_guest(machine)) {
 			/*
 			 * preload dso of guest kernel and modules
 			 */
-			dso__load(kernel,
-				kerninfo->vmlinux_maps[MAP__FUNCTION],
-				NULL);
+			dso__load(kernel, machine->vmlinux_maps[MAP__FUNCTION],
+				  NULL);
 		}
 	}
 	return 0;
@@ -479,7 +478,7 @@
 
 int event__process_mmap(event_t *self, struct perf_session *session)
 {
-	struct kernel_info *kerninfo;
+	struct machine *machine;
 	struct thread *thread;
 	struct map *map;
 	u8 cpumode = self->header.misc & PERF_RECORD_MISC_CPUMODE_MASK;
@@ -498,8 +497,8 @@
 	}
 
 	thread = perf_session__findnew(session, self->mmap.pid);
-	kerninfo = kerninfo__findhost(&session->kerninfo_root);
-	map = map__new(&kerninfo->dsos__user, self->mmap.start,
+	machine = perf_session__find_host_machine(session);
+	map = map__new(&machine->user_dsos, self->mmap.start,
 			self->mmap.len, self->mmap.pgoff,
 			self->mmap.pid, self->mmap.filename,
 			MAP__FUNCTION, session->cwd, session->cwdlen);
@@ -546,7 +545,7 @@
 			   struct addr_location *al)
 {
 	struct map_groups *mg = &self->mg;
-	struct kernel_info *kerninfo = NULL;
+	struct machine *machine = NULL;
 
 	al->thread = self;
 	al->addr = addr;
@@ -555,19 +554,19 @@
 
 	if (cpumode == PERF_RECORD_MISC_KERNEL && perf_host) {
 		al->level = 'k';
-		kerninfo = kerninfo__findhost(&session->kerninfo_root);
-		mg = &kerninfo->kmaps;
+		machine = perf_session__find_host_machine(session);
+		mg = &machine->kmaps;
 	} else if (cpumode == PERF_RECORD_MISC_USER && perf_host) {
 		al->level = '.';
-		kerninfo = kerninfo__findhost(&session->kerninfo_root);
+		machine = perf_session__find_host_machine(session);
 	} else if (cpumode == PERF_RECORD_MISC_GUEST_KERNEL && perf_guest) {
 		al->level = 'g';
-		kerninfo = kerninfo__find(&session->kerninfo_root, pid);
-		if (!kerninfo) {
+		machine = perf_session__find_machine(session, pid);
+		if (!machine) {
 			al->map = NULL;
 			return;
 		}
-		mg = &kerninfo->kmaps;
+		mg = &machine->kmaps;
 	} else {
 		/*
 		 * 'u' means guest os user space.
@@ -603,10 +602,9 @@
 		 * in the whole kernel symbol list.
 		 */
 		if ((long long)al->addr < 0 &&
-			cpumode == PERF_RECORD_MISC_KERNEL &&
-			kerninfo &&
-			mg != &kerninfo->kmaps)  {
-			mg = &kerninfo->kmaps;
+		    cpumode == PERF_RECORD_MISC_KERNEL &&
+		    machine && mg != &machine->kmaps) {
+			mg = &machine->kmaps;
 			goto try_again;
 		}
 	} else
diff --git a/tools/perf/util/event.h b/tools/perf/util/event.h
index 4af2ed5..b364da5 100644
--- a/tools/perf/util/event.h
+++ b/tools/perf/util/event.h
@@ -156,12 +156,12 @@
 			       struct perf_session *session);
 int event__synthesize_kernel_mmap(event__handler_t process,
 				struct perf_session *session,
-				struct kernel_info *kerninfo,
+				struct machine *machine,
 				const char *symbol_name);
 
 int event__synthesize_modules(event__handler_t process,
 			      struct perf_session *session,
-			      struct kernel_info *kerninfo);
+			      struct machine *machine);
 
 int event__process_comm(event_t *self, struct perf_session *session);
 int event__process_lost(event_t *self, struct perf_session *session);
diff --git a/tools/perf/util/header.c b/tools/perf/util/header.c
index 75d0167..6227dc4 100644
--- a/tools/perf/util/header.c
+++ b/tools/perf/util/header.c
@@ -229,10 +229,9 @@
 	int err = 0;
 	u16 kmisc, umisc;
 
-	for (nd = rb_first(&session->kerninfo_root); nd; nd = rb_next(nd)) {
-		struct kernel_info *pos = rb_entry(nd, struct kernel_info,
-				rb_node);
-		if (is_host_kernel(pos)) {
+	for (nd = rb_first(&session->machines); nd; nd = rb_next(nd)) {
+		struct machine *pos = rb_entry(nd, struct machine, rb_node);
+		if (machine__is_host(pos)) {
 			kmisc = PERF_RECORD_MISC_KERNEL;
 			umisc = PERF_RECORD_MISC_USER;
 		} else {
@@ -240,11 +239,11 @@
 			umisc = PERF_RECORD_MISC_GUEST_USER;
 		}
 
-		err = __dsos__write_buildid_table(&pos->dsos__kernel, pos->pid,
-				kmisc, fd);
+		err = __dsos__write_buildid_table(&pos->kernel_dsos, pos->pid,
+						  kmisc, fd);
 		if (err == 0)
-			err = __dsos__write_buildid_table(&pos->dsos__user,
-				pos->pid, umisc, fd);
+			err = __dsos__write_buildid_table(&pos->user_dsos,
+							  pos->pid, umisc, fd);
 		if (err)
 			break;
 	}
@@ -378,11 +377,10 @@
 	if (mkdir(debugdir, 0755) != 0 && errno != EEXIST)
 		return -1;
 
-	for (nd = rb_first(&session->kerninfo_root); nd; nd = rb_next(nd)) {
-		struct kernel_info *pos = rb_entry(nd, struct kernel_info,
-				rb_node);
-		ret |= __dsos__cache_build_ids(&pos->dsos__kernel, debugdir);
-		ret |= __dsos__cache_build_ids(&pos->dsos__user, debugdir);
+	for (nd = rb_first(&session->machines); nd; nd = rb_next(nd)) {
+		struct machine *pos = rb_entry(nd, struct machine, rb_node);
+		ret |= __dsos__cache_build_ids(&pos->kernel_dsos, debugdir);
+		ret |= __dsos__cache_build_ids(&pos->user_dsos, debugdir);
 	}
 	return ret ? -1 : 0;
 }
@@ -394,11 +392,10 @@
 			struct perf_session, header);
 	struct rb_node *nd;
 
-	for (nd = rb_first(&session->kerninfo_root); nd; nd = rb_next(nd)) {
-		struct kernel_info *pos = rb_entry(nd, struct kernel_info,
-				rb_node);
-		ret |= __dsos__read_build_ids(&pos->dsos__kernel, with_hits);
-		ret |= __dsos__read_build_ids(&pos->dsos__user, with_hits);
+	for (nd = rb_first(&session->machines); nd; nd = rb_next(nd)) {
+		struct machine *pos = rb_entry(nd, struct machine, rb_node);
+		ret |= __dsos__read_build_ids(&pos->kernel_dsos, with_hits);
+		ret |= __dsos__read_build_ids(&pos->user_dsos, with_hits);
 	}
 
 	return ret;
@@ -685,13 +682,13 @@
 {
 	int err = -1;
 	struct list_head *head;
-	struct kernel_info *kerninfo;
+	struct machine *machine;
 	u16 misc;
 	struct dso *dso;
 	enum dso_kernel_type dso_type;
 
-	kerninfo = kerninfo__findnew(&session->kerninfo_root, bev->pid);
-	if (!kerninfo)
+	machine = perf_session__findnew_machine(session, bev->pid);
+	if (!machine)
 		goto out;
 
 	misc = bev->header.misc & PERF_RECORD_MISC_CPUMODE_MASK;
@@ -699,16 +696,16 @@
 	switch (misc) {
 	case PERF_RECORD_MISC_KERNEL:
 		dso_type = DSO_TYPE_KERNEL;
-		head = &kerninfo->dsos__kernel;
+		head = &machine->kernel_dsos;
 		break;
 	case PERF_RECORD_MISC_GUEST_KERNEL:
 		dso_type = DSO_TYPE_GUEST_KERNEL;
-		head = &kerninfo->dsos__kernel;
+		head = &machine->kernel_dsos;
 		break;
 	case PERF_RECORD_MISC_USER:
 	case PERF_RECORD_MISC_GUEST_USER:
 		dso_type = DSO_TYPE_USER;
-		head = &kerninfo->dsos__user;
+		head = &machine->user_dsos;
 		break;
 	default:
 		goto out;
@@ -1113,8 +1110,7 @@
 }
 
 int event__synthesize_build_id(struct dso *pos, u16 misc,
-			       event__handler_t process,
-			       struct kernel_info *kerninfo,
+			       event__handler_t process, struct machine *machine,
 			       struct perf_session *session)
 {
 	event_t ev;
@@ -1131,7 +1127,7 @@
 	memcpy(&ev.build_id.build_id, pos->build_id, sizeof(pos->build_id));
 	ev.build_id.header.type = PERF_RECORD_HEADER_BUILD_ID;
 	ev.build_id.header.misc = misc;
-	ev.build_id.pid = kerninfo->pid;
+	ev.build_id.pid = machine->pid;
 	ev.build_id.header.size = sizeof(ev.build_id) + len;
 	memcpy(&ev.build_id.filename, pos->long_name, pos->long_name_len);
 
@@ -1142,7 +1138,7 @@
 
 static int __event_synthesize_build_ids(struct list_head *head, u16 misc,
 					event__handler_t process,
-					struct kernel_info *kerninfo,
+					struct machine *machine,
 					struct perf_session *session)
 {
 	struct dso *pos;
@@ -1153,7 +1149,7 @@
 			continue;
 
 		err = event__synthesize_build_id(pos, misc, process,
-					kerninfo, session);
+						 machine, session);
 		if (err < 0)
 			return err;
 	}
@@ -1166,15 +1162,15 @@
 {
 	int err = 0;
 	u16 kmisc, umisc;
-	struct kernel_info *pos;
+	struct machine *pos;
 	struct rb_node *nd;
 
 	if (!dsos__read_build_ids(&session->header, true))
 		return 0;
 
-	for (nd = rb_first(&session->kerninfo_root); nd; nd = rb_next(nd)) {
-		pos = rb_entry(nd, struct kernel_info, rb_node);
-		if (is_host_kernel(pos)) {
+	for (nd = rb_first(&session->machines); nd; nd = rb_next(nd)) {
+		pos = rb_entry(nd, struct machine, rb_node);
+		if (machine__is_host(pos)) {
 			kmisc = PERF_RECORD_MISC_KERNEL;
 			umisc = PERF_RECORD_MISC_USER;
 		} else {
@@ -1182,11 +1178,11 @@
 			umisc = PERF_RECORD_MISC_GUEST_USER;
 		}
 
-		err = __event_synthesize_build_ids(&pos->dsos__kernel,
-				kmisc, process, pos, session);
+		err = __event_synthesize_build_ids(&pos->kernel_dsos, kmisc,
+						   process, pos, session);
 		if (err == 0)
-			err = __event_synthesize_build_ids(&pos->dsos__user,
-					umisc, process, pos, session);
+			err = __event_synthesize_build_ids(&pos->user_dsos, umisc,
+							   process, pos, session);
 		if (err)
 			break;
 	}
diff --git a/tools/perf/util/header.h b/tools/perf/util/header.h
index 2759154..f39443d 100644
--- a/tools/perf/util/header.h
+++ b/tools/perf/util/header.h
@@ -120,7 +120,7 @@
 
 int event__synthesize_build_id(struct dso *pos, u16 misc,
 			       event__handler_t process,
-			       struct kernel_info *kerninfo,
+			       struct machine *machine,
 			       struct perf_session *session);
 int event__synthesize_build_ids(event__handler_t process,
 				struct perf_session *session);
diff --git a/tools/perf/util/map.c b/tools/perf/util/map.c
index 7facd01..da3d4e8 100644
--- a/tools/perf/util/map.c
+++ b/tools/perf/util/map.c
@@ -245,7 +245,7 @@
 		self->maps[i] = RB_ROOT;
 		INIT_LIST_HEAD(&self->removed_maps[i]);
 	}
-	 self->this_kerninfo = NULL;
+	self->machine = NULL;
 }
 
 void map_groups__flush(struct map_groups *self)
@@ -513,133 +513,130 @@
 	return NULL;
 }
 
-struct kernel_info *add_new_kernel_info(struct rb_root *kerninfo_root,
-			pid_t pid, const char *root_dir)
+struct machine *machines__add(struct rb_root *self, pid_t pid,
+			      const char *root_dir)
 {
-	struct rb_node **p = &kerninfo_root->rb_node;
+	struct rb_node **p = &self->rb_node;
 	struct rb_node *parent = NULL;
-	struct kernel_info *kerninfo, *pos;
+	struct machine *pos, *machine = malloc(sizeof(*machine));
 
-	kerninfo = malloc(sizeof(struct kernel_info));
-	if (!kerninfo)
+	if (!machine)
 		return NULL;
 
-	kerninfo->pid = pid;
-	map_groups__init(&kerninfo->kmaps);
-	kerninfo->root_dir = strdup(root_dir);
-	RB_CLEAR_NODE(&kerninfo->rb_node);
-	INIT_LIST_HEAD(&kerninfo->dsos__user);
-	INIT_LIST_HEAD(&kerninfo->dsos__kernel);
-	kerninfo->kmaps.this_kerninfo = kerninfo;
+	machine->pid = pid;
+	map_groups__init(&machine->kmaps);
+	machine->root_dir = strdup(root_dir);
+	RB_CLEAR_NODE(&machine->rb_node);
+	INIT_LIST_HEAD(&machine->user_dsos);
+	INIT_LIST_HEAD(&machine->kernel_dsos);
+	machine->kmaps.machine = machine;
 
 	while (*p != NULL) {
 		parent = *p;
-		pos = rb_entry(parent, struct kernel_info, rb_node);
+		pos = rb_entry(parent, struct machine, rb_node);
 		if (pid < pos->pid)
 			p = &(*p)->rb_left;
 		else
 			p = &(*p)->rb_right;
 	}
 
-	rb_link_node(&kerninfo->rb_node, parent, p);
-	rb_insert_color(&kerninfo->rb_node, kerninfo_root);
+	rb_link_node(&machine->rb_node, parent, p);
+	rb_insert_color(&machine->rb_node, self);
 
-	return kerninfo;
+	return machine;
 }
 
-struct kernel_info *kerninfo__find(struct rb_root *kerninfo_root, pid_t pid)
+struct machine *machines__find(struct rb_root *self, pid_t pid)
 {
-	struct rb_node **p = &kerninfo_root->rb_node;
+	struct rb_node **p = &self->rb_node;
 	struct rb_node *parent = NULL;
-	struct kernel_info *kerninfo;
-	struct kernel_info *default_kerninfo = NULL;
+	struct machine *machine;
+	struct machine *default_machine = NULL;
 
 	while (*p != NULL) {
 		parent = *p;
-		kerninfo = rb_entry(parent, struct kernel_info, rb_node);
-		if (pid < kerninfo->pid)
+		machine = rb_entry(parent, struct machine, rb_node);
+		if (pid < machine->pid)
 			p = &(*p)->rb_left;
-		else if (pid > kerninfo->pid)
+		else if (pid > machine->pid)
 			p = &(*p)->rb_right;
 		else
-			return kerninfo;
-		if (!kerninfo->pid)
-			default_kerninfo = kerninfo;
+			return machine;
+		if (!machine->pid)
+			default_machine = machine;
 	}
 
-	return default_kerninfo;
+	return default_machine;
 }
 
-struct kernel_info *kerninfo__findhost(struct rb_root *kerninfo_root)
+/*
+ * FIXME: Why repeatedly search for this?
+ */
+struct machine *machines__find_host(struct rb_root *self)
 {
-	struct rb_node **p = &kerninfo_root->rb_node;
+	struct rb_node **p = &self->rb_node;
 	struct rb_node *parent = NULL;
-	struct kernel_info *kerninfo;
+	struct machine *machine;
 	pid_t pid = HOST_KERNEL_ID;
 
 	while (*p != NULL) {
 		parent = *p;
-		kerninfo = rb_entry(parent, struct kernel_info, rb_node);
-		if (pid < kerninfo->pid)
+		machine = rb_entry(parent, struct machine, rb_node);
+		if (pid < machine->pid)
 			p = &(*p)->rb_left;
-		else if (pid > kerninfo->pid)
+		else if (pid > machine->pid)
 			p = &(*p)->rb_right;
 		else
-			return kerninfo;
+			return machine;
 	}
 
 	return NULL;
 }
 
-struct kernel_info *kerninfo__findnew(struct rb_root *kerninfo_root, pid_t pid)
+struct machine *machines__findnew(struct rb_root *self, pid_t pid)
 {
 	char path[PATH_MAX];
 	const char *root_dir;
-	int ret;
-	struct kernel_info *kerninfo = kerninfo__find(kerninfo_root, pid);
+	struct machine *machine = machines__find(self, pid);
 
-	if (!kerninfo || kerninfo->pid != pid) {
+	if (!machine || machine->pid != pid) {
 		if (pid == HOST_KERNEL_ID || pid == DEFAULT_GUEST_KERNEL_ID)
 			root_dir = "";
 		else {
 			if (!symbol_conf.guestmount)
 				goto out;
 			sprintf(path, "%s/%d", symbol_conf.guestmount, pid);
-			ret = access(path, R_OK);
-			if (ret) {
+			if (access(path, R_OK)) {
 				pr_err("Can't access file %s\n", path);
 				goto out;
 			}
 			root_dir = path;
 		}
-		kerninfo = add_new_kernel_info(kerninfo_root, pid, root_dir);
+		machine = machines__add(self, pid, root_dir);
 	}
 
 out:
-	return kerninfo;
+	return machine;
 }
 
-void kerninfo__process_allkernels(struct rb_root *kerninfo_root,
-		process_kernel_info process,
-		void *data)
+void machines__process(struct rb_root *self, machine__process_t process, void *data)
 {
 	struct rb_node *nd;
 
-	for (nd = rb_first(kerninfo_root); nd; nd = rb_next(nd)) {
-		struct kernel_info *pos = rb_entry(nd, struct kernel_info,
-							rb_node);
+	for (nd = rb_first(self); nd; nd = rb_next(nd)) {
+		struct machine *pos = rb_entry(nd, struct machine, rb_node);
 		process(pos, data);
 	}
 }
 
-char *kern_mmap_name(struct kernel_info *kerninfo, char *buff)
+char *machine__mmap_name(struct machine *self, char *buff)
 {
-	if (is_host_kernel(kerninfo))
+	if (machine__is_host(self))
 		sprintf(buff, "[%s]", "kernel.kallsyms");
-	else if (is_default_guest(kerninfo))
+	else if (machine__is_default_guest(self))
 		sprintf(buff, "[%s]", "guest.kernel.kallsyms");
 	else
-		sprintf(buff, "[%s.%d]", "guest.kernel.kallsyms", kerninfo->pid);
+		sprintf(buff, "[%s.%d]", "guest.kernel.kallsyms", self->pid);
 
 	return buff;
 }
diff --git a/tools/perf/util/map.h b/tools/perf/util/map.h
index 30d38d6..4c1c2da 100644
--- a/tools/perf/util/map.h
+++ b/tools/perf/util/map.h
@@ -5,6 +5,7 @@
 #include <linux/list.h>
 #include <linux/rbtree.h>
 #include <stdio.h>
+#include <stdbool.h>
 #include "types.h"
 
 enum map_type {
@@ -19,7 +20,7 @@
 struct dso;
 struct ref_reloc_sym;
 struct map_groups;
-struct kernel_info;
+struct machine;
 
 struct map {
 	union {
@@ -46,23 +47,23 @@
 };
 
 struct map_groups {
-	struct rb_root		maps[MAP__NR_TYPES];
-	struct list_head	removed_maps[MAP__NR_TYPES];
-	struct kernel_info	*this_kerninfo;
+	struct rb_root	 maps[MAP__NR_TYPES];
+	struct list_head removed_maps[MAP__NR_TYPES];
+	struct machine	 *machine;
 };
 
-/* Native host kernel uses -1 as pid index in kernel_info */
+/* Native host kernel uses -1 as pid index in machine */
 #define	HOST_KERNEL_ID			(-1)
 #define	DEFAULT_GUEST_KERNEL_ID		(0)
 
-struct kernel_info {
-	struct rb_node rb_node;
-	pid_t pid;
-	char *root_dir;
-	struct list_head dsos__user;
-	struct list_head dsos__kernel;
+struct machine {
+	struct rb_node	  rb_node;
+	pid_t		  pid;
+	char		  *root_dir;
+	struct list_head  user_dsos;
+	struct list_head  kernel_dsos;
 	struct map_groups kmaps;
-	struct map *vmlinux_maps[MAP__NR_TYPES];
+	struct map	  *vmlinux_maps[MAP__NR_TYPES];
 };
 
 static inline struct kmap *map__kmap(struct map *self)
@@ -124,36 +125,30 @@
 size_t map_groups__fprintf(struct map_groups *self, int verbose, FILE *fp);
 size_t map_groups__fprintf_maps(struct map_groups *self, int verbose, FILE *fp);
 
-struct kernel_info *add_new_kernel_info(struct rb_root *kerninfo_root,
-			pid_t pid, const char *root_dir);
-struct kernel_info *kerninfo__find(struct rb_root *kerninfo_root, pid_t pid);
-struct kernel_info *kerninfo__findnew(struct rb_root *kerninfo_root, pid_t pid);
-struct kernel_info *kerninfo__findhost(struct rb_root *kerninfo_root);
-char *kern_mmap_name(struct kernel_info *kerninfo, char *buff);
+typedef void (*machine__process_t)(struct machine *self, void *data);
+
+void machines__process(struct rb_root *self, machine__process_t process, void *data);
+struct machine *machines__add(struct rb_root *self, pid_t pid,
+			      const char *root_dir);
+struct machine *machines__find_host(struct rb_root *self);
+struct machine *machines__find(struct rb_root *self, pid_t pid);
+struct machine *machines__findnew(struct rb_root *self, pid_t pid);
+char *machine__mmap_name(struct machine *self, char *buff);
 
 /*
  * Default guest kernel is defined by parameter --guestkallsyms
  * and --guestmodules
  */
-static inline int is_default_guest(struct kernel_info *kerninfo)
+static inline bool machine__is_default_guest(struct machine *self)
 {
-	if (!kerninfo)
-		return 0;
-	return kerninfo->pid == DEFAULT_GUEST_KERNEL_ID;
+	return self ? self->pid == DEFAULT_GUEST_KERNEL_ID : false;
 }
 
-static inline int is_host_kernel(struct kernel_info *kerninfo)
+static inline bool machine__is_host(struct machine *self)
 {
-	if (!kerninfo)
-		return 0;
-	return kerninfo->pid == HOST_KERNEL_ID;
+	return self ? self->pid == HOST_KERNEL_ID : false;
 }
 
-typedef void (*process_kernel_info)(struct kernel_info *kerninfo, void *data);
-void kerninfo__process_allkernels(struct rb_root *kerninfo_root,
-				  process_kernel_info process,
-				  void *data);
-
 static inline void map_groups__insert(struct map_groups *self, struct map *map)
 {
 	maps__insert(&self->maps[map->type], map);
@@ -197,10 +192,8 @@
 
 struct map *map_groups__find_by_name(struct map_groups *self,
 				     enum map_type type, const char *name);
-struct map *map_groups__new_module(struct map_groups *self,
-				    u64 start,
-				    const char *filename,
-				    struct kernel_info *kerninfo);
+struct map *map_groups__new_module(struct map_groups *self, u64 start,
+				   const char *filename, struct machine *machine);
 
 void map_groups__flush(struct map_groups *self);
 
diff --git a/tools/perf/util/session.c b/tools/perf/util/session.c
index b7aade2..b745c1c 100644
--- a/tools/perf/util/session.c
+++ b/tools/perf/util/session.c
@@ -70,7 +70,7 @@
 int perf_session__create_kernel_maps(struct perf_session *self)
 {
 	int ret;
-	struct rb_root *root = &self->kerninfo_root;
+	struct rb_root *root = &self->machines;
 
 	ret = map_groups__create_kernel_maps(root, HOST_KERNEL_ID);
 	if (ret >= 0)
@@ -97,7 +97,7 @@
 	self->cwd = NULL;
 	self->cwdlen = 0;
 	self->unknown_events = 0;
-	self->kerninfo_root = RB_ROOT;
+	self->machines = RB_ROOT;
 	self->ordered_samples.flush_limit = ULLONG_MAX;
 	INIT_LIST_HEAD(&self->ordered_samples.samples_head);
 
diff --git a/tools/perf/util/session.h b/tools/perf/util/session.h
index 796e229..7125272 100644
--- a/tools/perf/util/session.h
+++ b/tools/perf/util/session.h
@@ -25,7 +25,7 @@
 	unsigned long		mmap_window;
 	struct rb_root		threads;
 	struct thread		*last_match;
-	struct rb_root		kerninfo_root;
+	struct rb_root		machines;
 	struct events_stats	events_stats;
 	struct rb_root		stats_by_id;
 	unsigned long		event_total[PERF_RECORD_MAX];
@@ -102,4 +102,29 @@
 			       u64 session_total, const char *helpline,
 			       const char *input_name);
 #endif
+
+static inline
+struct machine *perf_session__find_host_machine(struct perf_session *self)
+{
+	return machines__find_host(&self->machines);
+}
+
+static inline
+struct machine *perf_session__find_machine(struct perf_session *self, pid_t pid)
+{
+	return machines__find(&self->machines, pid);
+}
+
+static inline
+struct machine *perf_session__findnew_machine(struct perf_session *self, pid_t pid)
+{
+	return machines__findnew(&self->machines, pid);
+}
+
+static inline
+void perf_session__process_machines(struct perf_session *self,
+				    machine__process_t process)
+{
+	return machines__process(&self->machines, process, self);
+}
 #endif /* __PERF_SESSION_H */
diff --git a/tools/perf/util/symbol.c b/tools/perf/util/symbol.c
index e77c33a..dc04636 100644
--- a/tools/perf/util/symbol.c
+++ b/tools/perf/util/symbol.c
@@ -485,7 +485,7 @@
 			       symbol_filter_t filter)
 {
 	struct map_groups *kmaps = map__kmap(map)->kmaps;
-	struct kernel_info *kerninfo = kmaps->this_kerninfo;
+	struct machine *machine = kmaps->machine;
 	struct map *curr_map = map;
 	struct symbol *pos;
 	int count = 0;
@@ -508,8 +508,8 @@
 
 			if (strcmp(curr_map->dso->short_name, module)) {
 				if (curr_map != map &&
-					self->kernel == DSO_TYPE_GUEST_KERNEL &&
-					is_default_guest(kerninfo)) {
+				    self->kernel == DSO_TYPE_GUEST_KERNEL &&
+				    machine__is_default_guest(machine)) {
 					/*
 					 * We assume all symbols of a module are
 					 * continuous in * kallsyms, so curr_map
@@ -527,13 +527,13 @@
 					pr_err("%s/proc/{kallsyms,modules} "
 					         "inconsistency while looking "
 						 "for \"%s\" module!\n",
-						 kerninfo->root_dir, module);
+						 machine->root_dir, module);
 					curr_map = map;
 					goto discard_symbol;
 				}
 
 				if (curr_map->dso->loaded &&
-					!is_default_guest(kmaps->this_kerninfo))
+				    !machine__is_default_guest(machine))
 					goto discard_symbol;
 			}
 			/*
@@ -586,7 +586,7 @@
 
 	if (curr_map != map &&
 	    self->kernel == DSO_TYPE_GUEST_KERNEL &&
-	    is_default_guest(kmaps->this_kerninfo)) {
+	    machine__is_default_guest(kmaps->machine)) {
 		dso__set_loaded(curr_map->dso, curr_map->type);
 	}
 
@@ -1291,7 +1291,7 @@
 	char build_id_hex[BUILD_ID_SIZE * 2 + 1];
 	int ret = -1;
 	int fd;
-	struct kernel_info *kerninfo;
+	struct machine *machine;
 	const char *root_dir;
 
 	dso__set_loaded(self, map->type);
@@ -1301,10 +1301,10 @@
 	else if (self->kernel == DSO_TYPE_GUEST_KERNEL)
 		return dso__load_guest_kernel_sym(self, map, filter);
 
-	if (map->groups && map->groups->this_kerninfo)
-		kerninfo = map->groups->this_kerninfo;
+	if (map->groups && map->groups->machine)
+		machine = map->groups->machine;
 	else
-		kerninfo = NULL;
+		machine = NULL;
 
 	name = malloc(size);
 	if (!name)
@@ -1359,8 +1359,8 @@
 			snprintf(name, size, "%s", self->long_name);
 			break;
 		case DSO__ORIG_GUEST_KMODULE:
-			if (map->groups && map->groups->this_kerninfo)
-				root_dir = map->groups->this_kerninfo->root_dir;
+			if (map->groups && map->groups->machine)
+				root_dir = map->groups->machine->root_dir;
 			else
 				root_dir = "";
 			snprintf(name, size, "%s%s", root_dir, self->long_name);
@@ -1566,12 +1566,12 @@
 
 struct map *map_groups__new_module(struct map_groups *self, u64 start,
 				const char *filename,
-				struct kernel_info *kerninfo)
+				struct machine *machine)
 {
 	struct map *map;
 	struct dso *dso;
 
-	dso = __dsos__findnew(&kerninfo->dsos__kernel, filename);
+	dso = __dsos__findnew(&machine->kernel_dsos, filename);
 	if (dso == NULL)
 		return NULL;
 
@@ -1579,7 +1579,7 @@
 	if (map == NULL)
 		return NULL;
 
-	if (is_host_kernel(kerninfo))
+	if (machine__is_host(machine))
 		dso->origin = DSO__ORIG_KMODULE;
 	else
 		dso->origin = DSO__ORIG_GUEST_KMODULE;
@@ -1587,7 +1587,7 @@
 	return map;
 }
 
-static int map_groups__create_modules(struct kernel_info *kerninfo)
+static int map_groups__create_modules(struct machine *machine)
 {
 	char *line = NULL;
 	size_t n;
@@ -1597,10 +1597,10 @@
 	const char *modules;
 	char path[PATH_MAX];
 
-	if (is_default_guest(kerninfo))
+	if (machine__is_default_guest(machine))
 		modules = symbol_conf.default_guest_modules;
 	else {
-		sprintf(path, "%s/proc/modules", kerninfo->root_dir);
+		sprintf(path, "%s/proc/modules", machine->root_dir);
 		modules = path;
 	}
 
@@ -1608,7 +1608,7 @@
 	if (file == NULL)
 		return -1;
 
-	root_dir = kerninfo->root_dir;
+	root_dir = machine->root_dir;
 
 	while (!feof(file)) {
 		char name[PATH_MAX];
@@ -1638,8 +1638,8 @@
 		*sep = '\0';
 
 		snprintf(name, sizeof(name), "[%s]", line);
-		map = map_groups__new_module(&kerninfo->kmaps,
-				start, name, kerninfo);
+		map = map_groups__new_module(&machine->kmaps, start,
+					     name, machine);
 		if (map == NULL)
 			goto out_delete_line;
 		dso__kernel_module_get_build_id(map->dso, root_dir);
@@ -1648,7 +1648,7 @@
 	free(line);
 	fclose(file);
 
-	return map_groups__set_modules_path(&kerninfo->kmaps, root_dir);
+	return map_groups__set_modules_path(&machine->kmaps, root_dir);
 
 out_delete_line:
 	free(line);
@@ -1820,16 +1820,16 @@
 {
 	int err;
 	const char *kallsyms_filename = NULL;
-	struct kernel_info *kerninfo;
+	struct machine *machine;
 	char path[PATH_MAX];
 
 	if (!map->groups) {
 		pr_debug("Guest kernel map hasn't the point to groups\n");
 		return -1;
 	}
-	kerninfo = map->groups->this_kerninfo;
+	machine = map->groups->machine;
 
-	if (is_default_guest(kerninfo)) {
+	if (machine__is_default_guest(machine)) {
 		/*
 		 * if the user specified a vmlinux filename, use it and only
 		 * it, reporting errors to the user if it cannot be used.
@@ -1845,7 +1845,7 @@
 		if (!kallsyms_filename)
 			return -1;
 	} else {
-		sprintf(path, "%s/proc/kallsyms", kerninfo->root_dir);
+		sprintf(path, "%s/proc/kallsyms", machine->root_dir);
 		kallsyms_filename = path;
 	}
 
@@ -1856,9 +1856,8 @@
 out_try_fixup:
 	if (err > 0) {
 		if (kallsyms_filename != NULL) {
-			kern_mmap_name(kerninfo, path);
-			dso__set_long_name(self,
-				strdup(path));
+			machine__mmap_name(machine, path);
+			dso__set_long_name(self, strdup(path));
 		}
 		map__fixup_start(map);
 		map__fixup_end(map);
@@ -1908,15 +1907,14 @@
 	}
 }
 
-void dsos__fprintf(struct rb_root *kerninfo_root, FILE *fp)
+void dsos__fprintf(struct rb_root *machines, FILE *fp)
 {
 	struct rb_node *nd;
 
-	for (nd = rb_first(kerninfo_root); nd; nd = rb_next(nd)) {
-		struct kernel_info *pos = rb_entry(nd, struct kernel_info,
-				rb_node);
-		__dsos__fprintf(&pos->dsos__kernel, fp);
-		__dsos__fprintf(&pos->dsos__user, fp);
+	for (nd = rb_first(machines); nd; nd = rb_next(nd)) {
+		struct machine *pos = rb_entry(nd, struct machine, rb_node);
+		__dsos__fprintf(&pos->kernel_dsos, fp);
+		__dsos__fprintf(&pos->user_dsos, fp);
 	}
 }
 
@@ -1935,19 +1933,15 @@
 	return ret;
 }
 
-size_t dsos__fprintf_buildid(struct rb_root *kerninfo_root,
-		FILE *fp, bool with_hits)
+size_t dsos__fprintf_buildid(struct rb_root *machines, FILE *fp, bool with_hits)
 {
 	struct rb_node *nd;
 	size_t ret = 0;
 
-	for (nd = rb_first(kerninfo_root); nd; nd = rb_next(nd)) {
-		struct kernel_info *pos = rb_entry(nd, struct kernel_info,
-				rb_node);
-		ret += __dsos__fprintf_buildid(&pos->dsos__kernel,
-					fp, with_hits);
-		ret += __dsos__fprintf_buildid(&pos->dsos__user,
-					fp, with_hits);
+	for (nd = rb_first(machines); nd; nd = rb_next(nd)) {
+		struct machine *pos = rb_entry(nd, struct machine, rb_node);
+		ret += __dsos__fprintf_buildid(&pos->kernel_dsos, fp, with_hits);
+		ret += __dsos__fprintf_buildid(&pos->user_dsos, fp, with_hits);
 	}
 	return ret;
 }
@@ -1964,14 +1958,12 @@
 	return self;
 }
 
-static struct dso *dso__new_guest_kernel(struct kernel_info *kerninfo,
+static struct dso *dso__new_guest_kernel(struct machine *machine,
 					const char *name)
 {
 	char buff[PATH_MAX];
-	struct dso *self;
+	struct dso *self = dso__new(name ?: machine__mmap_name(machine, buff));
 
-	kern_mmap_name(kerninfo, buff);
-	self = dso__new(name ?: buff);
 	if (self != NULL) {
 		dso__set_short_name(self, "[guest.kernel]");
 		self->kernel = DSO_TYPE_GUEST_KERNEL;
@@ -1980,36 +1972,35 @@
 	return self;
 }
 
-void dso__read_running_kernel_build_id(struct dso *self,
-			struct kernel_info *kerninfo)
+void dso__read_running_kernel_build_id(struct dso *self, struct machine *machine)
 {
 	char path[PATH_MAX];
 
-	if (is_default_guest(kerninfo))
+	if (machine__is_default_guest(machine))
 		return;
-	sprintf(path, "%s/sys/kernel/notes", kerninfo->root_dir);
+	sprintf(path, "%s/sys/kernel/notes", machine->root_dir);
 	if (sysfs__read_build_id(path, self->build_id,
 				 sizeof(self->build_id)) == 0)
 		self->has_build_id = true;
 }
 
-static struct dso *dsos__create_kernel(struct kernel_info *kerninfo)
+static struct dso *dsos__create_kernel(struct machine *machine)
 {
 	const char *vmlinux_name = NULL;
 	struct dso *kernel;
 
-	if (is_host_kernel(kerninfo)) {
+	if (machine__is_host(machine)) {
 		vmlinux_name = symbol_conf.vmlinux_name;
 		kernel = dso__new_kernel(vmlinux_name);
 	} else {
-		if (is_default_guest(kerninfo))
+		if (machine__is_default_guest(machine))
 			vmlinux_name = symbol_conf.default_guest_vmlinux_name;
-		kernel = dso__new_guest_kernel(kerninfo, vmlinux_name);
+		kernel = dso__new_guest_kernel(machine, vmlinux_name);
 	}
 
 	if (kernel != NULL) {
-		dso__read_running_kernel_build_id(kernel, kerninfo);
-		dsos__add(&kerninfo->dsos__kernel, kernel);
+		dso__read_running_kernel_build_id(kernel, machine);
+		dsos__add(&machine->kernel_dsos, kernel);
 	}
 	return kernel;
 }
@@ -2154,29 +2145,28 @@
 	return -1;
 }
 
-int map_groups__create_kernel_maps(struct rb_root *kerninfo_root, pid_t pid)
+int map_groups__create_kernel_maps(struct rb_root *machines, pid_t pid)
 {
-	struct kernel_info *kerninfo;
 	struct dso *kernel;
+	struct machine *machine = machines__findnew(machines, pid);
 
-	kerninfo = kerninfo__findnew(kerninfo_root, pid);
-	if (kerninfo == NULL)
+	if (machine == NULL)
 		return -1;
-	kernel = dsos__create_kernel(kerninfo);
+	kernel = dsos__create_kernel(machine);
 	if (kernel == NULL)
 		return -1;
 
-	if (__map_groups__create_kernel_maps(&kerninfo->kmaps,
-			kerninfo->vmlinux_maps, kernel) < 0)
+	if (__map_groups__create_kernel_maps(&machine->kmaps,
+					     machine->vmlinux_maps, kernel) < 0)
 		return -1;
 
 	if (symbol_conf.use_modules &&
-		map_groups__create_modules(kerninfo) < 0)
+	    map_groups__create_modules(machine) < 0)
 		pr_debug("Problems creating module maps, continuing anyway...\n");
 	/*
 	 * Now that we have all the maps created, just set the ->end of them:
 	 */
-	map_groups__fixup_end(&kerninfo->kmaps);
+	map_groups__fixup_end(&machine->kmaps);
 	return 0;
 }
 
@@ -2223,7 +2213,7 @@
 	return s;
 }
 
-int map_groups__create_guest_kernel_maps(struct rb_root *kerninfo_root)
+int map_groups__create_guest_kernel_maps(struct rb_root *machines)
 {
 	int ret = 0;
 	struct dirent **namelist = NULL;
@@ -2234,8 +2224,7 @@
 	if (symbol_conf.default_guest_vmlinux_name ||
 	    symbol_conf.default_guest_modules ||
 	    symbol_conf.default_guest_kallsyms) {
-		map_groups__create_kernel_maps(kerninfo_root,
-					DEFAULT_GUEST_KERNEL_ID);
+		map_groups__create_kernel_maps(machines, DEFAULT_GUEST_KERNEL_ID);
 	}
 
 	if (symbol_conf.guestmount) {
@@ -2256,8 +2245,7 @@
 				pr_debug("Can't access file %s\n", path);
 				goto failure;
 			}
-			map_groups__create_kernel_maps(kerninfo_root,
-							pid);
+			map_groups__create_kernel_maps(machines, pid);
 		}
 failure:
 		free(namelist);
diff --git a/tools/perf/util/symbol.h b/tools/perf/util/symbol.h
index 478f5ab..ed885b0 100644
--- a/tools/perf/util/symbol.h
+++ b/tools/perf/util/symbol.h
@@ -186,8 +186,7 @@
 char dso__symtab_origin(const struct dso *self);
 void dso__set_long_name(struct dso *self, char *name);
 void dso__set_build_id(struct dso *self, void *build_id);
-void dso__read_running_kernel_build_id(struct dso *self,
-		struct kernel_info *kerninfo);
+void dso__read_running_kernel_build_id(struct dso *self, struct machine *machine);
 struct symbol *dso__find_symbol(struct dso *self, enum map_type type, u64 addr);
 struct symbol *dso__find_symbol_by_name(struct dso *self, enum map_type type,
 					const char *name);