diff --git a/arch/um/Kconfig b/arch/um/Kconfig
index e8983d098e73..4ec22e156a2e 100644
--- a/arch/um/Kconfig
+++ b/arch/um/Kconfig
@@ -6,6 +6,7 @@ config UML
 	bool
 	default y
 	select ARCH_EPHEMERAL_INODES
+	select ARCH_HAS_GCOV_PROFILE_ALL
 	select ARCH_HAS_KCOV
 	select ARCH_HAS_STRNCPY_FROM_USER
 	select ARCH_HAS_STRNLEN_USER
diff --git a/arch/um/drivers/Kconfig b/arch/um/drivers/Kconfig
index f145842c40b9..914da774bd39 100644
--- a/arch/um/drivers/Kconfig
+++ b/arch/um/drivers/Kconfig
@@ -64,6 +64,13 @@ config XTERM_CHAN
 	  its own xterm.
 	  It is safe to say 'Y' here.
 
+config XTERM_CHAN_DEFAULT_EMULATOR
+	string "xterm channel default terminal emulator"
+	depends on XTERM_CHAN
+	default "xterm"
+	help
+	  This option allows changing the default terminal emulator.
+
 config NOCONFIG_CHAN
 	bool
 	default !(XTERM_CHAN && TTY_CHAN && PTY_CHAN && PORT_CHAN && NULL_CHAN)
@@ -231,6 +238,14 @@ config UML_NET_DAEMON
 
 	  If unsure, say N.
 
+config UML_NET_DAEMON_DEFAULT_SOCK
+	string "Default socket for daemon transport"
+	default "/tmp/uml.ctl"
+	depends on UML_NET_DAEMON
+	help
+	  This option allows setting the default socket for the daemon
+	  transport, normally it defaults to /tmp/uml.ctl.
+
 config UML_NET_VECTOR
 	bool "Vector I/O high performance network devices"
 	depends on UML_NET
diff --git a/arch/um/drivers/Makefile b/arch/um/drivers/Makefile
index 803666e85414..e1dc4292bd22 100644
--- a/arch/um/drivers/Makefile
+++ b/arch/um/drivers/Makefile
@@ -70,4 +70,6 @@ obj-$(CONFIG_UML_PCI_OVER_VIRTIO) += virt-pci.o
 USER_OBJS := fd.o null.o pty.o tty.o xterm.o slip_common.o pcap_user.o vde_user.o vector_user.o
 CFLAGS_null.o = -DDEV_NULL=$(DEV_NULL_PATH)
 
+CFLAGS_xterm.o += '-DCONFIG_XTERM_CHAN_DEFAULT_EMULATOR="$(CONFIG_XTERM_CHAN_DEFAULT_EMULATOR)"'
+
 include arch/um/scripts/Makefile.rules
diff --git a/arch/um/drivers/chan_kern.c b/arch/um/drivers/chan_kern.c
index 62997055c454..26a702a06515 100644
--- a/arch/um/drivers/chan_kern.c
+++ b/arch/um/drivers/chan_kern.c
@@ -133,7 +133,7 @@ static void line_timer_cb(struct work_struct *work)
 	struct line *line = container_of(work, struct line, task.work);
 
 	if (!line->throttled)
-		chan_interrupt(line, line->driver->read_irq);
+		chan_interrupt(line, line->read_irq);
 }
 
 int enable_chan(struct line *line)
@@ -195,9 +195,9 @@ void free_irqs(void)
 		chan = list_entry(ele, struct chan, free_list);
 
 		if (chan->input && chan->enabled)
-			um_free_irq(chan->line->driver->read_irq, chan);
+			um_free_irq(chan->line->read_irq, chan);
 		if (chan->output && chan->enabled)
-			um_free_irq(chan->line->driver->write_irq, chan);
+			um_free_irq(chan->line->write_irq, chan);
 		chan->enabled = 0;
 	}
 }
@@ -215,9 +215,9 @@ static void close_one_chan(struct chan *chan, int delay_free_irq)
 		spin_unlock_irqrestore(&irqs_to_free_lock, flags);
 	} else {
 		if (chan->input && chan->enabled)
-			um_free_irq(chan->line->driver->read_irq, chan);
+			um_free_irq(chan->line->read_irq, chan);
 		if (chan->output && chan->enabled)
-			um_free_irq(chan->line->driver->write_irq, chan);
+			um_free_irq(chan->line->write_irq, chan);
 		chan->enabled = 0;
 	}
 	if (chan->ops->close != NULL)
diff --git a/arch/um/drivers/chan_user.c b/arch/um/drivers/chan_user.c
index 6040817c036f..25727ed648b7 100644
--- a/arch/um/drivers/chan_user.c
+++ b/arch/um/drivers/chan_user.c
@@ -220,7 +220,7 @@ static int winch_tramp(int fd, struct tty_port *port, int *fd_out,
 		       unsigned long *stack_out)
 {
 	struct winch_data data;
-	int fds[2], n, err;
+	int fds[2], n, err, pid;
 	char c;
 
 	err = os_pipe(fds, 1, 1);
@@ -238,8 +238,9 @@ static int winch_tramp(int fd, struct tty_port *port, int *fd_out,
 	 * problem with /dev/net/tun, which if held open by this
 	 * thread, prevents the TUN/TAP device from being reused.
 	 */
-	err = run_helper_thread(winch_thread, &data, CLONE_FILES, stack_out);
-	if (err < 0) {
+	pid = run_helper_thread(winch_thread, &data, CLONE_FILES, stack_out);
+	if (pid < 0) {
+		err = pid;
 		printk(UM_KERN_ERR "fork of winch_thread failed - errno = %d\n",
 		       -err);
 		goto out_close;
@@ -263,7 +264,7 @@ static int winch_tramp(int fd, struct tty_port *port, int *fd_out,
 		goto out_close;
 	}
 
-	return err;
+	return pid;
 
  out_close:
 	close(fds[1]);
diff --git a/arch/um/drivers/daemon_kern.c b/arch/um/drivers/daemon_kern.c
index fd2402669c49..afde1e82c056 100644
--- a/arch/um/drivers/daemon_kern.c
+++ b/arch/um/drivers/daemon_kern.c
@@ -65,7 +65,7 @@ static int daemon_setup(char *str, char **mac_out, void *data)
 
 	*init = ((struct daemon_init)
 		{ .sock_type 		= "unix",
-		  .ctl_sock 		= "/tmp/uml.ctl" });
+		  .ctl_sock 		= CONFIG_UML_NET_DAEMON_DEFAULT_SOCK });
 
 	remain = split_if_spec(str, mac_out, &init->sock_type, &init->ctl_sock,
 			       NULL);
diff --git a/arch/um/drivers/line.c b/arch/um/drivers/line.c
index 8febf95da96e..02b0befd6763 100644
--- a/arch/um/drivers/line.c
+++ b/arch/um/drivers/line.c
@@ -139,7 +139,7 @@ static int flush_buffer(struct line *line)
 		count = line->buffer + LINE_BUFSIZE - line->head;
 
 		n = write_chan(line->chan_out, line->head, count,
-			       line->driver->write_irq);
+			       line->write_irq);
 		if (n < 0)
 			return n;
 		if (n == count) {
@@ -156,7 +156,7 @@ static int flush_buffer(struct line *line)
 
 	count = line->tail - line->head;
 	n = write_chan(line->chan_out, line->head, count,
-		       line->driver->write_irq);
+		       line->write_irq);
 
 	if (n < 0)
 		return n;
@@ -195,7 +195,7 @@ int line_write(struct tty_struct *tty, const unsigned char *buf, int len)
 		ret = buffer_data(line, buf, len);
 	else {
 		n = write_chan(line->chan_out, buf, len,
-			       line->driver->write_irq);
+			       line->write_irq);
 		if (n < 0) {
 			ret = n;
 			goto out_up;
@@ -215,7 +215,7 @@ void line_throttle(struct tty_struct *tty)
 {
 	struct line *line = tty->driver_data;
 
-	deactivate_chan(line->chan_in, line->driver->read_irq);
+	deactivate_chan(line->chan_in, line->read_irq);
 	line->throttled = 1;
 }
 
@@ -224,7 +224,7 @@ void line_unthrottle(struct tty_struct *tty)
 	struct line *line = tty->driver_data;
 
 	line->throttled = 0;
-	chan_interrupt(line, line->driver->read_irq);
+	chan_interrupt(line, line->read_irq);
 }
 
 static irqreturn_t line_write_interrupt(int irq, void *data)
@@ -260,19 +260,23 @@ int line_setup_irq(int fd, int input, int output, struct line *line, void *data)
 	int err;
 
 	if (input) {
-		err = um_request_irq(driver->read_irq, fd, IRQ_READ,
-				     line_interrupt, IRQF_SHARED,
+		err = um_request_irq(UM_IRQ_ALLOC, fd, IRQ_READ,
+				     line_interrupt, 0,
 				     driver->read_irq_name, data);
 		if (err < 0)
 			return err;
+
+		line->read_irq = err;
 	}
 
 	if (output) {
-		err = um_request_irq(driver->write_irq, fd, IRQ_WRITE,
-				     line_write_interrupt, IRQF_SHARED,
+		err = um_request_irq(UM_IRQ_ALLOC, fd, IRQ_WRITE,
+				     line_write_interrupt, 0,
 				     driver->write_irq_name, data);
 		if (err < 0)
 			return err;
+
+		line->write_irq = err;
 	}
 
 	return 0;
diff --git a/arch/um/drivers/line.h b/arch/um/drivers/line.h
index bdb16b96e76f..f15be75a3bf3 100644
--- a/arch/um/drivers/line.h
+++ b/arch/um/drivers/line.h
@@ -23,9 +23,7 @@ struct line_driver {
 	const short minor_start;
 	const short type;
 	const short subtype;
-	const int read_irq;
 	const char *read_irq_name;
-	const int write_irq;
 	const char *write_irq_name;
 	struct mc_device mc;
 	struct tty_driver *driver;
@@ -35,6 +33,8 @@ struct line {
 	struct tty_port port;
 	int valid;
 
+	int read_irq, write_irq;
+
 	char *init_str;
 	struct list_head chan_list;
 	struct chan *chan_in, *chan_out;
diff --git a/arch/um/drivers/ssl.c b/arch/um/drivers/ssl.c
index 41eae2e8fb65..8514966778d5 100644
--- a/arch/um/drivers/ssl.c
+++ b/arch/um/drivers/ssl.c
@@ -47,9 +47,7 @@ static struct line_driver driver = {
 	.minor_start 		= 64,
 	.type 		 	= TTY_DRIVER_TYPE_SERIAL,
 	.subtype 	 	= 0,
-	.read_irq 		= SSL_IRQ,
 	.read_irq_name 		= "ssl",
-	.write_irq 		= SSL_WRITE_IRQ,
 	.write_irq_name 	= "ssl-write",
 	.mc  = {
 		.list		= LIST_HEAD_INIT(driver.mc.list),
diff --git a/arch/um/drivers/stdio_console.c b/arch/um/drivers/stdio_console.c
index e8b762f4d8c2..489d5a746ed3 100644
--- a/arch/um/drivers/stdio_console.c
+++ b/arch/um/drivers/stdio_console.c
@@ -53,9 +53,7 @@ static struct line_driver driver = {
 	.minor_start 		= 0,
 	.type 		 	= TTY_DRIVER_TYPE_CONSOLE,
 	.subtype 	 	= SYSTEM_TYPE_CONSOLE,
-	.read_irq 		= CONSOLE_IRQ,
 	.read_irq_name 		= "console",
-	.write_irq 		= CONSOLE_WRITE_IRQ,
 	.write_irq_name 	= "console-write",
 	.mc  = {
 		.list		= LIST_HEAD_INIT(driver.mc.list),
diff --git a/arch/um/drivers/virtio_uml.c b/arch/um/drivers/virtio_uml.c
index ba562d68dc04..82ff3785bf69 100644
--- a/arch/um/drivers/virtio_uml.c
+++ b/arch/um/drivers/virtio_uml.c
@@ -63,6 +63,7 @@ struct virtio_uml_device {
 
 	u8 config_changed_irq:1;
 	uint64_t vq_irq_vq_map;
+	int recv_rc;
 };
 
 struct virtio_uml_vq_info {
@@ -148,14 +149,6 @@ static int vhost_user_recv(struct virtio_uml_device *vu_dev,
 
 	rc = vhost_user_recv_header(fd, msg);
 
-	if (rc == -ECONNRESET && vu_dev->registered) {
-		struct virtio_uml_platform_data *pdata;
-
-		pdata = vu_dev->pdata;
-
-		virtio_break_device(&vu_dev->vdev);
-		schedule_work(&pdata->conn_broken_wk);
-	}
 	if (rc)
 		return rc;
 	size = msg->header.size;
@@ -164,6 +157,21 @@ static int vhost_user_recv(struct virtio_uml_device *vu_dev,
 	return full_read(fd, &msg->payload, size, false);
 }
 
+static void vhost_user_check_reset(struct virtio_uml_device *vu_dev,
+				   int rc)
+{
+	struct virtio_uml_platform_data *pdata = vu_dev->pdata;
+
+	if (rc != -ECONNRESET)
+		return;
+
+	if (!vu_dev->registered)
+		return;
+
+	virtio_break_device(&vu_dev->vdev);
+	schedule_work(&pdata->conn_broken_wk);
+}
+
 static int vhost_user_recv_resp(struct virtio_uml_device *vu_dev,
 				struct vhost_user_msg *msg,
 				size_t max_payload_size)
@@ -171,8 +179,10 @@ static int vhost_user_recv_resp(struct virtio_uml_device *vu_dev,
 	int rc = vhost_user_recv(vu_dev, vu_dev->sock, msg,
 				 max_payload_size, true);
 
-	if (rc)
+	if (rc) {
+		vhost_user_check_reset(vu_dev, rc);
 		return rc;
+	}
 
 	if (msg->header.flags != (VHOST_USER_FLAG_REPLY | VHOST_USER_VERSION))
 		return -EPROTO;
@@ -369,6 +379,7 @@ static irqreturn_t vu_req_read_message(struct virtio_uml_device *vu_dev,
 				 sizeof(msg.msg.payload) +
 				 sizeof(msg.extra_payload));
 
+	vu_dev->recv_rc = rc;
 	if (rc)
 		return IRQ_NONE;
 
@@ -412,7 +423,9 @@ static irqreturn_t vu_req_interrupt(int irq, void *data)
 	if (!um_irq_timetravel_handler_used())
 		ret = vu_req_read_message(vu_dev, NULL);
 
-	if (vu_dev->vq_irq_vq_map) {
+	if (vu_dev->recv_rc) {
+		vhost_user_check_reset(vu_dev, vu_dev->recv_rc);
+	} else if (vu_dev->vq_irq_vq_map) {
 		struct virtqueue *vq;
 
 		virtio_device_for_each_vq((&vu_dev->vdev), vq) {
diff --git a/arch/um/drivers/xterm.c b/arch/um/drivers/xterm.c
index 87ca4a47cd66..6918de5e2956 100644
--- a/arch/um/drivers/xterm.c
+++ b/arch/um/drivers/xterm.c
@@ -42,7 +42,7 @@ static void *xterm_init(char *str, int device, const struct chan_opts *opts)
 }
 
 /* Only changed by xterm_setup, which is a setup */
-static char *terminal_emulator = "xterm";
+static char *terminal_emulator = CONFIG_XTERM_CHAN_DEFAULT_EMULATOR;
 static char *title_switch = "-T";
 static char *exec_switch = "-e";
 
@@ -79,8 +79,9 @@ __uml_setup("xterm=", xterm_setup,
 "    respectively.  The title switch must have the form '<switch> title',\n"
 "    not '<switch>=title'.  Similarly, the exec switch must have the form\n"
 "    '<switch> command arg1 arg2 ...'.\n"
-"    The default values are 'xterm=xterm,-T,-e'.  Values for gnome-terminal\n"
-"    are 'xterm=gnome-terminal,-t,-x'.\n\n"
+"    The default values are 'xterm=" CONFIG_XTERM_CHAN_DEFAULT_EMULATOR
+     ",-T,-e'.\n"
+"    Values for gnome-terminal are 'xterm=gnome-terminal,-t,-x'.\n\n"
 );
 
 static int xterm_open(int input, int output, int primary, void *d,
diff --git a/arch/um/include/asm/Kbuild b/arch/um/include/asm/Kbuild
index f1f3f52f1e9c..b2d834a29f3a 100644
--- a/arch/um/include/asm/Kbuild
+++ b/arch/um/include/asm/Kbuild
@@ -4,6 +4,7 @@ generic-y += bug.h
 generic-y += compat.h
 generic-y += current.h
 generic-y += device.h
+generic-y += dma-mapping.h
 generic-y += emergency-restart.h
 generic-y += exec.h
 generic-y += extable.h
diff --git a/arch/um/include/asm/irq.h b/arch/um/include/asm/irq.h
index e187c789369d..749dfe8512e8 100644
--- a/arch/um/include/asm/irq.h
+++ b/arch/um/include/asm/irq.h
@@ -4,19 +4,15 @@
 
 #define TIMER_IRQ		0
 #define UMN_IRQ			1
-#define CONSOLE_IRQ		2
-#define CONSOLE_WRITE_IRQ	3
-#define UBD_IRQ			4
-#define UM_ETH_IRQ		5
-#define SSL_IRQ			6
-#define SSL_WRITE_IRQ		7
-#define ACCEPT_IRQ		8
-#define MCONSOLE_IRQ		9
-#define WINCH_IRQ		10
-#define SIGIO_WRITE_IRQ 	11
-#define TELNETD_IRQ 		12
-#define XTERM_IRQ 		13
-#define RANDOM_IRQ 		14
+#define UBD_IRQ			2
+#define UM_ETH_IRQ		3
+#define ACCEPT_IRQ		4
+#define MCONSOLE_IRQ		5
+#define WINCH_IRQ		6
+#define SIGIO_WRITE_IRQ 	7
+#define TELNETD_IRQ 		8
+#define XTERM_IRQ 		9
+#define RANDOM_IRQ 		10
 
 #ifdef CONFIG_UML_NET_VECTOR
 
diff --git a/arch/x86/um/ldt.c b/arch/x86/um/ldt.c
index 3ee234b6234d..255a44dd415a 100644
--- a/arch/x86/um/ldt.c
+++ b/arch/x86/um/ldt.c
@@ -23,9 +23,11 @@ static long write_ldt_entry(struct mm_id *mm_idp, int func,
 {
 	long res;
 	void *stub_addr;
+
+	BUILD_BUG_ON(sizeof(*desc) % sizeof(long));
+
 	res = syscall_stub_data(mm_idp, (unsigned long *)desc,
-				(sizeof(*desc) + sizeof(long) - 1) &
-				    ~(sizeof(long) - 1),
+				sizeof(*desc) / sizeof(long),
 				addr, &stub_addr);
 	if (!res) {
 		unsigned long args[] = { func,