Index: stand/lua/core.lua
===================================================================
--- stand/lua/core.lua
+++ stand/lua/core.lua
@@ -174,6 +174,41 @@
 	return kernels;
 end
 
+function core.bootenvDefault()
+	return loader.getenv("zfs_be_active");
+end
+
+function core.bootenvList()
+	local bootenv_count = tonumber(loader.getenv("bootenvs_count"));
+	local bootenvs = {};
+	local curenv;
+	local curenv_idx = 0;
+	local envcount = 0;
+	local unique = {};
+
+	if (bootenv_count == nil) or (bootenv_count <= 0) then
+		return bootenvs;
+	end
+
+	-- Currently selected bootenv is always first/default
+	curenv = core.bootenvDefault();
+	if (curenv ~= nil) then
+		envcount = envcount + 1;
+		bootenvs[envcount] = curenv;
+		unique[curenv] = true;
+	end
+
+	for curenv_idx = 0, bootenv_count - 1 do
+		curenv = loader.getenv("bootenvs[" .. curenv_idx .. "]");
+		if (curenv ~= nil) and (unique[curenv] == nil) then
+			envcount = envcount + 1;
+			bootenvs[envcount] = curenv;
+			unique[curenv] = true;
+		end
+	end
+	return bootenvs;
+end
+
 function core.setDefaults()
 	core.setACPI(core.getACPIPresent(true));
 	core.setSafeMode(false);
@@ -196,6 +231,15 @@
 	return single_user ~= nil and single_user:lower() == "yes";
 end
 
+function core.isZFSBoot()
+	local c = loader.getenv("currdev");
+
+	if (c ~= nil) then
+		return (c:match("^zfs:") ~= nil);
+	end
+	return false;
+end
+
 function core.isSerialBoot()
 	local c = loader.getenv("console");
 
Index: stand/lua/menu.lua
===================================================================
--- stand/lua/menu.lua
+++ stand/lua/menu.lua
@@ -44,6 +44,67 @@
 
 -- loader menu tree is rooted at menu.welcome
 
+function bootenvSet(env)
+	loader.setenv("vfs.root.mountfrom", env);
+	loader.setenv("currdev", env .. ":");
+	config.reload();
+end
+
+menu.boot_environments = {
+	entries = {
+		-- return to welcome menu
+		{
+			entry_type = core.MENU_RETURN,
+			name = function()
+				return "Back to main menu" ..
+				    color.highlight(" [Backspace]");
+			end
+		},
+		{
+			entry_type = core.MENU_CAROUSEL_ENTRY,
+			carousel_id = "be_active",
+			items = core.bootenvList,
+			name = function(idx, choice, all_choices)
+				if (#all_choices == 0) then
+					return "Active: ";
+				end
+
+				local is_default = (idx == 1);
+				local bootenv_name = "";
+				local name_color;
+				if (is_default) then
+					name_color = color.escapef(color.GREEN);
+					bootenv_name = "default/";
+				else
+					name_color = color.escapef(color.BLUE);
+				end
+				bootenv_name = bootenv_name .. name_color ..
+				    choice .. color.default();
+				return color.highlight("A").."ctive: " ..
+				    bootenv_name .. " (" .. idx .. " of " ..
+				    #all_choices .. ")";
+			end,
+			func = function(idx, choice, all_choices)
+				bootenvSet(choice);
+			end,
+			alias = {"a", "A"}
+		},
+		{
+			entry_type = core.MENU_ENTRY,
+			name = function()
+				return color.highlight("b") .. "ootfs: " ..
+				    core.bootenvDefault();
+			end,
+			func = function()
+				-- Reset active boot environment to the default
+				menu.setCarouselIndex("be_active", 1);
+				bootenvSet(core.bootenvDefault());
+			end,
+			alias = {"b", "B"}
+		},
+	},
+};
+
 menu.boot_options = {
 	entries = {
 		-- return to welcome menu
@@ -280,6 +341,20 @@
 			end,
 			alias = {"o", "O"}
 		},
+		-- boot environments
+		{
+			entry_type = core.MENU_SUBMENU,
+			visible = function()
+				return core.isZFSBoot() and #core.bootenvList() > 1;
+			end,
+			name = function()
+				return "Boot " .. color.highlight("E") .. "nvironments";
+			end,
+			submenu = function()
+				return menu.boot_environments;
+			end,
+			alias = {"e", "E"}
+		},
 	},
 };