char: use qemu_chr_fe* functions with CharBackend argument

This also switches from qemu_chr_add_handlers() to
qemu_chr_fe_set_handlers(). Note that qemu_chr_fe_set_handlers() now
takes the focus when fe_open (qemu_chr_add_handlers() did take the
focus)

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Message-Id: <20161022095318.17775-16-marcandre.lureau@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

25 files changed, 159 insertions, 150 deletions

diff --git a/hw/char/bcm2835_aux.c b/hw/char/bcm2835_aux.c
index 30f4ea546b..c49ec8ce41 100644
--- a/hw/char/bcm2835_aux.c
+++ b/hw/char/bcm2835_aux.c
@@ -80,7 +80,7 @@ static uint64_t bcm2835_aux_read(void *opaque, hwaddr offset, unsigned size)
             }
         }
         if (s->chr.chr) {
-            qemu_chr_fe_accept_input(s->chr.chr);
+            qemu_chr_fe_accept_input(&s->chr);
         }
         bcm2835_aux_update(s);
         return c;
@@ -171,7 +171,7 @@ static void bcm2835_aux_write(void *opaque, hwaddr offset, uint64_t value,
         if (s->chr.chr) {
             /* XXX this blocks entire thread. Rewrite to use
              * qemu_chr_fe_write and background I/O callbacks */
-            qemu_chr_fe_write_all(s->chr.chr, &ch, 1);
+            qemu_chr_fe_write_all(&s->chr, &ch, 1);
         }
         break;
 
@@ -283,8 +283,8 @@ static void bcm2835_aux_realize(DeviceState *dev, Error **errp)
     BCM2835AuxState *s = BCM2835_AUX(dev);
 
     if (s->chr.chr) {
-        qemu_chr_add_handlers(s->chr.chr, bcm2835_aux_can_receive,
-                              bcm2835_aux_receive, NULL, s);
+        qemu_chr_fe_set_handlers(&s->chr, bcm2835_aux_can_receive,
+                                 bcm2835_aux_receive, NULL, s, NULL);
     }
 }
 
diff --git a/hw/char/cadence_uart.c b/hw/char/cadence_uart.c
index c02723502c..4459b2d6af 100644
--- a/hw/char/cadence_uart.c
+++ b/hw/char/cadence_uart.c
@@ -143,7 +143,7 @@ static void uart_rx_reset(CadenceUARTState *s)
     s->rx_wpos = 0;
     s->rx_count = 0;
     if (s->chr.chr) {
-        qemu_chr_fe_accept_input(s->chr.chr);
+        qemu_chr_fe_accept_input(&s->chr);
     }
 }
 
@@ -157,8 +157,8 @@ static void uart_send_breaks(CadenceUARTState *s)
     int break_enabled = 1;
 
     if (s->chr.chr) {
-        qemu_chr_fe_ioctl(s->chr.chr, CHR_IOCTL_SERIAL_SET_BREAK,
-                                   &break_enabled);
+        qemu_chr_fe_ioctl(&s->chr, CHR_IOCTL_SERIAL_SET_BREAK,
+                          &break_enabled);
     }
 }
 
@@ -211,7 +211,7 @@ static void uart_parameters_setup(CadenceUARTState *s)
     packet_size += ssp.data_bits + ssp.stop_bits;
     s->char_tx_time = (NANOSECONDS_PER_SECOND / ssp.speed) * packet_size;
     if (s->chr.chr) {
-        qemu_chr_fe_ioctl(s->chr.chr, CHR_IOCTL_SERIAL_SET_PARAMS, &ssp);
+        qemu_chr_fe_ioctl(&s->chr, CHR_IOCTL_SERIAL_SET_PARAMS, &ssp);
     }
 }
 
@@ -278,7 +278,7 @@ static gboolean cadence_uart_xmit(GIOChannel *chan, GIOCondition cond,
     int ret;
 
     /* instant drain the fifo when there's no back-end */
-    if (!s->chr.chr) {
+    if (!qemu_chr_fe_get_driver(&s->chr)) {
         s->tx_count = 0;
         return FALSE;
     }
@@ -287,7 +287,7 @@ static gboolean cadence_uart_xmit(GIOChannel *chan, GIOCondition cond,
         return FALSE;
     }
 
-    ret = qemu_chr_fe_write(s->chr.chr, s->tx_fifo, s->tx_count);
+    ret = qemu_chr_fe_write(&s->chr, s->tx_fifo, s->tx_count);
 
     if (ret >= 0) {
         s->tx_count -= ret;
@@ -295,7 +295,7 @@ static gboolean cadence_uart_xmit(GIOChannel *chan, GIOCondition cond,
     }
 
     if (s->tx_count) {
-        guint r = qemu_chr_fe_add_watch(s->chr.chr, G_IO_OUT | G_IO_HUP,
+        guint r = qemu_chr_fe_add_watch(&s->chr, G_IO_OUT | G_IO_HUP,
                                         cadence_uart_xmit, s);
         if (!r) {
             s->tx_count = 0;
@@ -369,7 +369,7 @@ static void uart_read_rx_fifo(CadenceUARTState *s, uint32_t *c)
         s->rx_count--;
 
         if (s->chr.chr) {
-            qemu_chr_fe_accept_input(s->chr.chr);
+            qemu_chr_fe_accept_input(&s->chr);
         }
     } else {
         *c = 0;
@@ -475,8 +475,8 @@ static void cadence_uart_realize(DeviceState *dev, Error **errp)
                                           fifo_trigger_update, s);
 
     if (s->chr.chr) {
-        qemu_chr_add_handlers(s->chr.chr, uart_can_receive, uart_receive,
-                              uart_event, s);
+        qemu_chr_fe_set_handlers(&s->chr, uart_can_receive, uart_receive,
+                                 uart_event, s, NULL);
     }
 }
 
diff --git a/hw/char/debugcon.c b/hw/char/debugcon.c
index b405109eb5..2009c3e844 100644
--- a/hw/char/debugcon.c
+++ b/hw/char/debugcon.c
@@ -62,7 +62,7 @@ static void debugcon_ioport_write(void *opaque, hwaddr addr, uint64_t val,
 
     /* XXX this blocks entire thread. Rewrite to use
      * qemu_chr_fe_write and background I/O callbacks */
-    qemu_chr_fe_write_all(s->chr.chr, &ch, 1);
+    qemu_chr_fe_write_all(&s->chr, &ch, 1);
 }
 
 
@@ -87,12 +87,12 @@ static const MemoryRegionOps debugcon_ops = {
 
 static void debugcon_realize_core(DebugconState *s, Error **errp)
 {
-    if (!s->chr.chr) {
+    if (!qemu_chr_fe_get_driver(&s->chr)) {
         error_setg(errp, "Can't create debugcon device, empty char device");
         return;
     }
 
-    qemu_chr_add_handlers(s->chr.chr, NULL, NULL, NULL, s);
+    qemu_chr_fe_set_handlers(&s->chr, NULL, NULL, NULL, s, NULL);
 }
 
 static void debugcon_isa_realizefn(DeviceState *dev, Error **errp)
diff --git a/hw/char/digic-uart.c b/hw/char/digic-uart.c
index fb4969fc50..c7b3db631d 100644
--- a/hw/char/digic-uart.c
+++ b/hw/char/digic-uart.c
@@ -79,7 +79,7 @@ static void digic_uart_write(void *opaque, hwaddr addr, uint64_t value,
         if (s->chr.chr) {
             /* XXX this blocks entire thread. Rewrite to use
              * qemu_chr_fe_write and background I/O callbacks */
-            qemu_chr_fe_write_all(s->chr.chr, &ch, 1);
+            qemu_chr_fe_write_all(&s->chr, &ch, 1);
         }
         break;
 
@@ -148,7 +148,8 @@ static void digic_uart_realize(DeviceState *dev, Error **errp)
     DigicUartState *s = DIGIC_UART(dev);
 
     if (s->chr.chr) {
-        qemu_chr_add_handlers(s->chr.chr, uart_can_rx, uart_rx, uart_event, s);
+        qemu_chr_fe_set_handlers(&s->chr, uart_can_rx, uart_rx,
+                                 uart_event, s, NULL);
     }
 }
 
diff --git a/hw/char/escc.c b/hw/char/escc.c
index f1e8fac6f3..4578a46f10 100644
--- a/hw/char/escc.c
+++ b/hw/char/escc.c
@@ -416,7 +416,7 @@ static void escc_update_parameters(ChannelState *s)
     int speed, parity, data_bits, stop_bits;
     QEMUSerialSetParams ssp;
 
-    if (!s->chr.chr || s->type != ser)
+    if (!qemu_chr_fe_get_driver(&s->chr) || s->type != ser)
         return;
 
     if (s->wregs[W_TXCTRL1] & TXCTRL1_PAREN) {
@@ -466,7 +466,7 @@ static void escc_update_parameters(ChannelState *s)
     ssp.data_bits = data_bits;
     ssp.stop_bits = stop_bits;
     trace_escc_update_parameters(CHN_C(s), speed, parity, data_bits, stop_bits);
-    qemu_chr_fe_ioctl(s->chr.chr, CHR_IOCTL_SERIAL_SET_PARAMS, &ssp);
+    qemu_chr_fe_ioctl(&s->chr, CHR_IOCTL_SERIAL_SET_PARAMS, &ssp);
 }
 
 static void escc_mem_write(void *opaque, hwaddr addr,
@@ -556,10 +556,10 @@ static void escc_mem_write(void *opaque, hwaddr addr,
         trace_escc_mem_writeb_data(CHN_C(s), val);
         s->tx = val;
         if (s->wregs[W_TXCTRL2] & TXCTRL2_TXEN) { // tx enabled
-            if (s->chr.chr) {
+            if (qemu_chr_fe_get_driver(&s->chr)) {
                 /* XXX this blocks entire thread. Rewrite to use
                  * qemu_chr_fe_write and background I/O callbacks */
-                qemu_chr_fe_write_all(s->chr.chr, &s->tx, 1);
+                qemu_chr_fe_write_all(&s->chr, &s->tx, 1);
             } else if (s->type == kbd && !s->disabled) {
                 handle_kbd_command(s, val);
             }
@@ -600,7 +600,7 @@ static uint64_t escc_mem_read(void *opaque, hwaddr addr,
             ret = s->rx;
         trace_escc_mem_readb_data(CHN_C(s), ret);
         if (s->chr.chr) {
-            qemu_chr_fe_accept_input(s->chr.chr);
+            qemu_chr_fe_accept_input(&s->chr);
         }
         return ret;
     default:
@@ -1014,10 +1014,11 @@ static void escc_realize(DeviceState *dev, Error **errp)
                           ESCC_SIZE << s->it_shift);
 
     for (i = 0; i < 2; i++) {
-        if (s->chn[i].chr.chr) {
+        if (qemu_chr_fe_get_driver(&s->chn[i].chr)) {
             s->chn[i].clock = s->frequency / 2;
-            qemu_chr_add_handlers(s->chn[i].chr.chr, serial_can_receive,
-                                  serial_receive1, serial_event, &s->chn[i]);
+            qemu_chr_fe_set_handlers(&s->chn[i].chr, serial_can_receive,
+                                     serial_receive1, serial_event,
+                                     &s->chn[i], NULL);
         }
     }
 
diff --git a/hw/char/etraxfs_ser.c b/hw/char/etraxfs_ser.c
index 99c4801ba6..d812954345 100644
--- a/hw/char/etraxfs_ser.c
+++ b/hw/char/etraxfs_ser.c
@@ -128,7 +128,7 @@ ser_write(void *opaque, hwaddr addr,
         case RW_DOUT:
             /* XXX this blocks entire thread. Rewrite to use
              * qemu_chr_fe_write and background I/O callbacks */
-            qemu_chr_fe_write_all(s->chr.chr, &ch, 1);
+            qemu_chr_fe_write_all(&s->chr, &ch, 1);
             s->regs[R_INTR] |= 3;
             s->pending_tx = 1;
             s->regs[addr] = value;
@@ -232,9 +232,9 @@ static void etraxfs_ser_realize(DeviceState *dev, Error **errp)
     ETRAXSerial *s = ETRAX_SERIAL(dev);
 
     if (s->chr.chr) {
-        qemu_chr_add_handlers(s->chr.chr,
-                              serial_can_receive, serial_receive,
-                              serial_event, s);
+        qemu_chr_fe_set_handlers(&s->chr,
+                                 serial_can_receive, serial_receive,
+                                 serial_event, s, NULL);
     }
 }
 
diff --git a/hw/char/exynos4210_uart.c b/hw/char/exynos4210_uart.c
index 3f71059eee..48216b1863 100644
--- a/hw/char/exynos4210_uart.c
+++ b/hw/char/exynos4210_uart.c
@@ -346,7 +346,7 @@ static void exynos4210_uart_update_parameters(Exynos4210UartState *s)
     ssp.data_bits = data_bits;
     ssp.stop_bits = stop_bits;
 
-    qemu_chr_fe_ioctl(s->chr.chr, CHR_IOCTL_SERIAL_SET_PARAMS, &ssp);
+    qemu_chr_fe_ioctl(&s->chr, CHR_IOCTL_SERIAL_SET_PARAMS, &ssp);
 
     PRINT_DEBUG("UART%d: speed: %d, parity: %c, data: %d, stop: %d\n",
                 s->channel, speed, parity, data_bits, stop_bits);
@@ -383,13 +383,13 @@ static void exynos4210_uart_write(void *opaque, hwaddr offset,
         break;
 
     case UTXH:
-        if (s->chr.chr) {
+        if (qemu_chr_fe_get_driver(&s->chr)) {
             s->reg[I_(UTRSTAT)] &= ~(UTRSTAT_TRANSMITTER_EMPTY |
                     UTRSTAT_Tx_BUFFER_EMPTY);
             ch = (uint8_t)val;
             /* XXX this blocks entire thread. Rewrite to use
              * qemu_chr_fe_write and background I/O callbacks */
-            qemu_chr_fe_write_all(s->chr.chr, &ch, 1);
+            qemu_chr_fe_write_all(&s->chr, &ch, 1);
 #if DEBUG_Tx_DATA
             fprintf(stderr, "%c", ch);
 #endif
@@ -640,8 +640,9 @@ static int exynos4210_uart_init(SysBusDevice *dev)
 
     sysbus_init_irq(dev, &s->irq);
 
-    qemu_chr_add_handlers(s->chr.chr, exynos4210_uart_can_receive,
-                          exynos4210_uart_receive, exynos4210_uart_event, s);
+    qemu_chr_fe_set_handlers(&s->chr, exynos4210_uart_can_receive,
+                             exynos4210_uart_receive, exynos4210_uart_event,
+                             s, NULL);
 
     return 0;
 }
diff --git a/hw/char/grlib_apbuart.c b/hw/char/grlib_apbuart.c
index 13c9455ed6..e50d65b9f6 100644
--- a/hw/char/grlib_apbuart.c
+++ b/hw/char/grlib_apbuart.c
@@ -201,11 +201,12 @@ static void grlib_apbuart_write(void *opaque, hwaddr addr,
     case DATA_OFFSET:
     case DATA_OFFSET + 3:       /* When only one byte write */
         /* Transmit when character device available and transmitter enabled */
-        if (uart->chr.chr && (uart->control & UART_TRANSMIT_ENABLE)) {
+        if (qemu_chr_fe_get_driver(&uart->chr) &&
+            (uart->control & UART_TRANSMIT_ENABLE)) {
             c = value & 0xFF;
             /* XXX this blocks entire thread. Rewrite to use
              * qemu_chr_fe_write and background I/O callbacks */
-            qemu_chr_fe_write_all(uart->chr.chr, &c, 1);
+            qemu_chr_fe_write_all(&uart->chr, &c, 1);
             /* Generate interrupt */
             if (uart->control & UART_TRANSMIT_INTERRUPT) {
                 qemu_irq_pulse(uart->irq);
@@ -242,11 +243,11 @@ static int grlib_apbuart_init(SysBusDevice *dev)
 {
     UART *uart = GRLIB_APB_UART(dev);
 
-    qemu_chr_add_handlers(uart->chr.chr,
-                          grlib_apbuart_can_receive,
-                          grlib_apbuart_receive,
-                          grlib_apbuart_event,
-                          uart);
+    qemu_chr_fe_set_handlers(&uart->chr,
+                             grlib_apbuart_can_receive,
+                             grlib_apbuart_receive,
+                             grlib_apbuart_event,
+                             uart, NULL);
 
     sysbus_init_irq(dev, &uart->irq);
 
diff --git a/hw/char/imx_serial.c b/hw/char/imx_serial.c
index 2e39d319fe..d9a0a25d44 100644
--- a/hw/char/imx_serial.c
+++ b/hw/char/imx_serial.c
@@ -122,7 +122,7 @@ static uint64_t imx_serial_read(void *opaque, hwaddr offset,
             s->uts1 |= UTS1_RXEMPTY;
             imx_update(s);
             if (s->chr.chr) {
-                qemu_chr_fe_accept_input(s->chr.chr);
+                qemu_chr_fe_accept_input(&s->chr);
             }
         }
         return c;
@@ -172,11 +172,11 @@ static void imx_serial_write(void *opaque, hwaddr offset,
                              uint64_t value, unsigned size)
 {
     IMXSerialState *s = (IMXSerialState *)opaque;
+    CharDriverState *chr = qemu_chr_fe_get_driver(&s->chr);
     unsigned char ch;
 
     DPRINTF("write(offset=0x%" HWADDR_PRIx ", value = 0x%x) to %s\n",
-            offset, (unsigned int)value,
-            s->chr.chr ? s->chr.chr->label : "NODEV");
+            offset, (unsigned int)value, chr ? chr->label : "NODEV");
 
     switch (offset >> 2) {
     case 0x10: /* UTXD */
@@ -185,7 +185,7 @@ static void imx_serial_write(void *opaque, hwaddr offset,
             if (s->chr.chr) {
                 /* XXX this blocks entire thread. Rewrite to use
                  * qemu_chr_fe_write and background I/O callbacks */
-                qemu_chr_fe_write_all(s->chr.chr, &ch, 1);
+                qemu_chr_fe_write_all(&s->chr, &ch, 1);
             }
             s->usr1 &= ~USR1_TRDY;
             imx_update(s);
@@ -216,7 +216,7 @@ static void imx_serial_write(void *opaque, hwaddr offset,
         if (value & UCR2_RXEN) {
             if (!(s->ucr2 & UCR2_RXEN)) {
                 if (s->chr.chr) {
-                    qemu_chr_fe_accept_input(s->chr.chr);
+                    qemu_chr_fe_accept_input(&s->chr);
                 }
             }
         }
@@ -320,8 +320,8 @@ static void imx_serial_realize(DeviceState *dev, Error **errp)
     IMXSerialState *s = IMX_SERIAL(dev);
 
     if (s->chr.chr) {
-        qemu_chr_add_handlers(s->chr.chr, imx_can_receive, imx_receive,
-                              imx_event, s);
+        qemu_chr_fe_set_handlers(&s->chr, imx_can_receive, imx_receive,
+                                 imx_event, s, NULL);
     } else {
         DPRINTF("No char dev for uart\n");
     }
diff --git a/hw/char/ipoctal232.c b/hw/char/ipoctal232.c
index 875fe3b22a..d504721a99 100644
--- a/hw/char/ipoctal232.c
+++ b/hw/char/ipoctal232.c
@@ -289,7 +289,7 @@ static uint16_t io_read(IPackDevice *ip, uint8_t addr)
                 ch->sr &= ~SR_RXRDY;
                 blk->isr &= ~ISR_RXRDY(channel);
                 if (ch->dev.chr) {
-                    qemu_chr_fe_accept_input(ch->dev.chr);
+                    qemu_chr_fe_accept_input(&ch->dev);
                 }
             } else {
                 ch->rhr_idx = (ch->rhr_idx + 1) % RX_FIFO_SIZE;
@@ -362,7 +362,7 @@ static void io_write(IPackDevice *ip, uint8_t addr, uint16_t val)
                 uint8_t thr = reg;
                 /* XXX this blocks entire thread. Rewrite to use
                  * qemu_chr_fe_write and background I/O callbacks */
-                qemu_chr_fe_write_all(ch->dev.chr, &thr, 1);
+                qemu_chr_fe_write_all(&ch->dev, &thr, 1);
             }
         } else {
             DPRINTF("Write THR%c (0x%x), Tx disabled\n", channel + 'a', reg);
@@ -546,9 +546,9 @@ static void ipoctal_realize(DeviceState *dev, Error **errp)
         ch->ipoctal = s;
 
         /* Redirect IP-Octal channels to host character devices */
-        if (ch->dev.chr) {
-            qemu_chr_add_handlers(ch->dev.chr, hostdev_can_receive,
-                                  hostdev_receive, hostdev_event, ch);
+        if (qemu_chr_fe_get_driver(&ch->dev)) {
+            qemu_chr_fe_set_handlers(&ch->dev, hostdev_can_receive,
+                                     hostdev_receive, hostdev_event, ch, NULL);
             DPRINTF("Redirecting channel %u to %s\n", i, ch->dev->label);
         } else {
             DPRINTF("Could not redirect channel %u, no chardev set\n", i);
diff --git a/hw/char/lm32_juart.c b/hw/char/lm32_juart.c
index a0eb3127b3..9629e9e4b7 100644
--- a/hw/char/lm32_juart.c
+++ b/hw/char/lm32_juart.c
@@ -78,7 +78,7 @@ void lm32_juart_set_jtx(DeviceState *d, uint32_t jtx)
     if (s->chr.chr) {
         /* XXX this blocks entire thread. Rewrite to use
          * qemu_chr_fe_write and background I/O callbacks */
-        qemu_chr_fe_write_all(s->chr.chr, &ch, 1);
+        qemu_chr_fe_write_all(&s->chr, &ch, 1);
     }
 }
 
@@ -121,8 +121,8 @@ static void lm32_juart_realize(DeviceState *dev, Error **errp)
     LM32JuartState *s = LM32_JUART(dev);
 
     if (s->chr.chr) {
-        qemu_chr_add_handlers(s->chr.chr, juart_can_rx,
-                              juart_rx, juart_event, s);
+        qemu_chr_fe_set_handlers(&s->chr, juart_can_rx, juart_rx,
+                                 juart_event, s, NULL);
     }
 }
 
diff --git a/hw/char/lm32_uart.c b/hw/char/lm32_uart.c
index a8d4a2db70..e325b917b3 100644
--- a/hw/char/lm32_uart.c
+++ b/hw/char/lm32_uart.c
@@ -142,7 +142,7 @@ static uint64_t uart_read(void *opaque, hwaddr addr,
         r = s->regs[R_RXTX];
         s->regs[R_LSR] &= ~LSR_DR;
         uart_update_irq(s);
-        qemu_chr_fe_accept_input(s->chr.chr);
+        qemu_chr_fe_accept_input(&s->chr);
         break;
     case R_IIR:
     case R_LSR:
@@ -180,7 +180,7 @@ static void uart_write(void *opaque, hwaddr addr,
         if (s->chr.chr) {
             /* XXX this blocks entire thread. Rewrite to use
              * qemu_chr_fe_write and background I/O callbacks */
-            qemu_chr_fe_write_all(s->chr.chr, &ch, 1);
+            qemu_chr_fe_write_all(&s->chr, &ch, 1);
         }
         break;
     case R_IER:
@@ -268,7 +268,8 @@ static void lm32_uart_realize(DeviceState *dev, Error **errp)
     LM32UartState *s = LM32_UART(dev);
 
     if (s->chr.chr) {
-        qemu_chr_add_handlers(s->chr.chr, uart_can_rx, uart_rx, uart_event, s);
+        qemu_chr_fe_set_handlers(&s->chr, uart_can_rx, uart_rx,
+                                 uart_event, s, NULL);
     }
 }
 
diff --git a/hw/char/mcf_uart.c b/hw/char/mcf_uart.c
index 57b47c6690..cc3db1373c 100644
--- a/hw/char/mcf_uart.c
+++ b/hw/char/mcf_uart.c
@@ -93,7 +93,7 @@ uint64_t mcf_uart_read(void *opaque, hwaddr addr,
             if (s->fifo_len == 0)
                 s->sr &= ~MCF_UART_RxRDY;
             mcf_uart_update(s);
-            qemu_chr_fe_accept_input(s->chr.chr);
+            qemu_chr_fe_accept_input(&s->chr);
             return val;
         }
     case 0x10:
@@ -117,7 +117,7 @@ static void mcf_uart_do_tx(mcf_uart_state *s)
         if (s->chr.chr) {
             /* XXX this blocks entire thread. Rewrite to use
              * qemu_chr_fe_write and background I/O callbacks */
-            qemu_chr_fe_write_all(s->chr.chr, (unsigned char *)&s->tb, 1);
+            qemu_chr_fe_write_all(&s->chr, (unsigned char *)&s->tb, 1);
         }
         s->sr |= MCF_UART_TxEMP;
     }
@@ -286,8 +286,8 @@ void *mcf_uart_init(qemu_irq irq, CharDriverState *chr)
     if (chr) {
         qemu_chr_fe_init(&s->chr, chr, &error_abort);
         qemu_chr_fe_claim_no_fail(chr);
-        qemu_chr_add_handlers(chr, mcf_uart_can_receive, mcf_uart_receive,
-                              mcf_uart_event, s);
+        qemu_chr_fe_set_handlers(&s->chr, mcf_uart_can_receive,
+                                 mcf_uart_receive, mcf_uart_event, s, NULL);
     }
     mcf_uart_reset(s);
     return s;
diff --git a/hw/char/milkymist-uart.c b/hw/char/milkymist-uart.c
index c75bcb57fd..0a4c617a7f 100644
--- a/hw/char/milkymist-uart.c
+++ b/hw/char/milkymist-uart.c
@@ -125,7 +125,7 @@ static void uart_write(void *opaque, hwaddr addr, uint64_t value,
     switch (addr) {
     case R_RXTX:
         if (s->chr.chr) {
-            qemu_chr_fe_write_all(s->chr.chr, &ch, 1);
+            qemu_chr_fe_write_all(&s->chr, &ch, 1);
         }
         s->regs[R_STAT] |= STAT_TX_EVT;
         break;
@@ -138,7 +138,7 @@ static void uart_write(void *opaque, hwaddr addr, uint64_t value,
     case R_STAT:
         /* write one to clear bits */
         s->regs[addr] &= ~(value & (STAT_RX_EVT | STAT_TX_EVT));
-        qemu_chr_fe_accept_input(s->chr.chr);
+        qemu_chr_fe_accept_input(&s->chr);
         break;
 
     default:
@@ -201,7 +201,8 @@ static void milkymist_uart_realize(DeviceState *dev, Error **errp)
     MilkymistUartState *s = MILKYMIST_UART(dev);
 
     if (s->chr.chr) {
-        qemu_chr_add_handlers(s->chr.chr, uart_can_rx, uart_rx, uart_event, s);
+        qemu_chr_fe_set_handlers(&s->chr, uart_can_rx, uart_rx,
+                                 uart_event, s, NULL);
     }
 }
 
diff --git a/hw/char/parallel.c b/hw/char/parallel.c
index 80576afc1d..f2d56666b7 100644
--- a/hw/char/parallel.c
+++ b/hw/char/parallel.c
@@ -131,7 +131,7 @@ parallel_ioport_write_sw(void *opaque, uint32_t addr, uint32_t val)
                 if ((s->control & PARA_CTR_STROBE) == 0)
                     /* XXX this blocks entire thread. Rewrite to use
                      * qemu_chr_fe_write and background I/O callbacks */
-                    qemu_chr_fe_write_all(s->chr.chr, &s->dataw, 1);
+                    qemu_chr_fe_write_all(&s->chr, &s->dataw, 1);
             } else {
                 if (s->control & PARA_CTR_INTEN) {
                     s->irq_pending = 1;
@@ -161,7 +161,7 @@ static void parallel_ioport_write_hw(void *opaque, uint32_t addr, uint32_t val)
         if (s->dataw == val)
             return;
         pdebug("wd%02x\n", val);
-        qemu_chr_fe_ioctl(s->chr.chr, CHR_IOCTL_PP_WRITE_DATA, &parm);
+        qemu_chr_fe_ioctl(&s->chr, CHR_IOCTL_PP_WRITE_DATA, &parm);
         s->dataw = val;
         break;
     case PARA_REG_STS:
@@ -181,11 +181,11 @@ static void parallel_ioport_write_hw(void *opaque, uint32_t addr, uint32_t val)
             } else {
                 dir = 0;
             }
-            qemu_chr_fe_ioctl(s->chr.chr, CHR_IOCTL_PP_DATA_DIR, &dir);
+            qemu_chr_fe_ioctl(&s->chr, CHR_IOCTL_PP_DATA_DIR, &dir);
             parm &= ~PARA_CTR_DIR;
         }
 
-        qemu_chr_fe_ioctl(s->chr.chr, CHR_IOCTL_PP_WRITE_CONTROL, &parm);
+        qemu_chr_fe_ioctl(&s->chr, CHR_IOCTL_PP_WRITE_CONTROL, &parm);
         s->control = val;
         break;
     case PARA_REG_EPP_ADDR:
@@ -194,7 +194,7 @@ static void parallel_ioport_write_hw(void *opaque, uint32_t addr, uint32_t val)
             pdebug("wa%02x s\n", val);
         else {
             struct ParallelIOArg ioarg = { .buffer = &parm, .count = 1 };
-            if (qemu_chr_fe_ioctl(s->chr.chr,
+            if (qemu_chr_fe_ioctl(&s->chr,
                                   CHR_IOCTL_PP_EPP_WRITE_ADDR, &ioarg)) {
                 s->epp_timeout = 1;
                 pdebug("wa%02x t\n", val);
@@ -209,7 +209,7 @@ static void parallel_ioport_write_hw(void *opaque, uint32_t addr, uint32_t val)
             pdebug("we%02x s\n", val);
         else {
             struct ParallelIOArg ioarg = { .buffer = &parm, .count = 1 };
-            if (qemu_chr_fe_ioctl(s->chr.chr, CHR_IOCTL_PP_EPP_WRITE, &ioarg)) {
+            if (qemu_chr_fe_ioctl(&s->chr, CHR_IOCTL_PP_EPP_WRITE, &ioarg)) {
                 s->epp_timeout = 1;
                 pdebug("we%02x t\n", val);
             }
@@ -234,7 +234,7 @@ parallel_ioport_eppdata_write_hw2(void *opaque, uint32_t addr, uint32_t val)
         pdebug("we%04x s\n", val);
         return;
     }
-    err = qemu_chr_fe_ioctl(s->chr.chr, CHR_IOCTL_PP_EPP_WRITE, &ioarg);
+    err = qemu_chr_fe_ioctl(&s->chr, CHR_IOCTL_PP_EPP_WRITE, &ioarg);
     if (err) {
         s->epp_timeout = 1;
         pdebug("we%04x t\n", val);
@@ -257,7 +257,7 @@ parallel_ioport_eppdata_write_hw4(void *opaque, uint32_t addr, uint32_t val)
         pdebug("we%08x s\n", val);
         return;
     }
-    err = qemu_chr_fe_ioctl(s->chr.chr, CHR_IOCTL_PP_EPP_WRITE, &ioarg);
+    err = qemu_chr_fe_ioctl(&s->chr, CHR_IOCTL_PP_EPP_WRITE, &ioarg);
     if (err) {
         s->epp_timeout = 1;
         pdebug("we%08x t\n", val);
@@ -309,13 +309,13 @@ static uint32_t parallel_ioport_read_hw(void *opaque, uint32_t addr)
     addr &= 7;
     switch(addr) {
     case PARA_REG_DATA:
-        qemu_chr_fe_ioctl(s->chr.chr, CHR_IOCTL_PP_READ_DATA, &ret);
+        qemu_chr_fe_ioctl(&s->chr, CHR_IOCTL_PP_READ_DATA, &ret);
         if (s->last_read_offset != addr || s->datar != ret)
             pdebug("rd%02x\n", ret);
         s->datar = ret;
         break;
     case PARA_REG_STS:
-        qemu_chr_fe_ioctl(s->chr.chr, CHR_IOCTL_PP_READ_STATUS, &ret);
+        qemu_chr_fe_ioctl(&s->chr, CHR_IOCTL_PP_READ_STATUS, &ret);
         ret &= ~PARA_STS_TMOUT;
         if (s->epp_timeout)
             ret |= PARA_STS_TMOUT;
@@ -327,7 +327,7 @@ static uint32_t parallel_ioport_read_hw(void *opaque, uint32_t addr)
         /* s->control has some bits fixed to 1. It is zero only when
            it has not been yet written to.  */
         if (s->control == 0) {
-            qemu_chr_fe_ioctl(s->chr.chr, CHR_IOCTL_PP_READ_CONTROL, &ret);
+            qemu_chr_fe_ioctl(&s->chr, CHR_IOCTL_PP_READ_CONTROL, &ret);
             if (s->last_read_offset != addr)
                 pdebug("rc%02x\n", ret);
             s->control = ret;
@@ -345,7 +345,7 @@ static uint32_t parallel_ioport_read_hw(void *opaque, uint32_t addr)
             pdebug("ra%02x s\n", ret);
         else {
             struct ParallelIOArg ioarg = { .buffer = &ret, .count = 1 };
-            if (qemu_chr_fe_ioctl(s->chr.chr,
+            if (qemu_chr_fe_ioctl(&s->chr,
                                   CHR_IOCTL_PP_EPP_READ_ADDR, &ioarg)) {
                 s->epp_timeout = 1;
                 pdebug("ra%02x t\n", ret);
@@ -361,7 +361,7 @@ static uint32_t parallel_ioport_read_hw(void *opaque, uint32_t addr)
             pdebug("re%02x s\n", ret);
         else {
             struct ParallelIOArg ioarg = { .buffer = &ret, .count = 1 };
-            if (qemu_chr_fe_ioctl(s->chr.chr, CHR_IOCTL_PP_EPP_READ, &ioarg)) {
+            if (qemu_chr_fe_ioctl(&s->chr, CHR_IOCTL_PP_EPP_READ, &ioarg)) {
                 s->epp_timeout = 1;
                 pdebug("re%02x t\n", ret);
             }
@@ -389,7 +389,7 @@ parallel_ioport_eppdata_read_hw2(void *opaque, uint32_t addr)
         pdebug("re%04x s\n", eppdata);
         return eppdata;
     }
-    err = qemu_chr_fe_ioctl(s->chr.chr, CHR_IOCTL_PP_EPP_READ, &ioarg);
+    err = qemu_chr_fe_ioctl(&s->chr, CHR_IOCTL_PP_EPP_READ, &ioarg);
     ret = le16_to_cpu(eppdata);
 
     if (err) {
@@ -416,7 +416,7 @@ parallel_ioport_eppdata_read_hw4(void *opaque, uint32_t addr)
         pdebug("re%08x s\n", eppdata);
         return eppdata;
     }
-    err = qemu_chr_fe_ioctl(s->chr.chr, CHR_IOCTL_PP_EPP_READ, &ioarg);
+    err = qemu_chr_fe_ioctl(&s->chr, CHR_IOCTL_PP_EPP_READ, &ioarg);
     ret = le32_to_cpu(eppdata);
 
     if (err) {
@@ -512,7 +512,7 @@ static void parallel_isa_realizefn(DeviceState *dev, Error **errp)
     int base;
     uint8_t dummy;
 
-    if (!s->chr.chr) {
+    if (!qemu_chr_fe_get_driver(&s->chr)) {
         error_setg(errp, "Can't create parallel device, empty char device");
         return;
     }
@@ -534,7 +534,7 @@ static void parallel_isa_realizefn(DeviceState *dev, Error **errp)
     isa_init_irq(isadev, &s->irq, isa->isairq);
     qemu_register_reset(parallel_reset, s);
 
-    if (qemu_chr_fe_ioctl(s->chr.chr, CHR_IOCTL_PP_READ_STATUS, &dummy) == 0) {
+    if (qemu_chr_fe_ioctl(&s->chr, CHR_IOCTL_PP_READ_STATUS, &dummy) == 0) {
         s->hw_driver = 1;
         s->status = dummy;
     }
diff --git a/hw/char/pl011.c b/hw/char/pl011.c
index 29fb7251a1..52ec86658e 100644
--- a/hw/char/pl011.c
+++ b/hw/char/pl011.c
@@ -88,7 +88,7 @@ static uint64_t pl011_read(void *opaque, hwaddr offset,
         s->rsr = c >> 8;
         pl011_update(s);
         if (s->chr.chr) {
-            qemu_chr_fe_accept_input(s->chr.chr);
+            qemu_chr_fe_accept_input(&s->chr);
         }
         r = c;
         break;
@@ -171,7 +171,7 @@ static void pl011_write(void *opaque, hwaddr offset,
         if (s->chr.chr) {
             /* XXX this blocks entire thread. Rewrite to use
              * qemu_chr_fe_write and background I/O callbacks */
-            qemu_chr_fe_write_all(s->chr.chr, &ch, 1);
+            qemu_chr_fe_write_all(&s->chr, &ch, 1);
         }
         s->int_level |= PL011_INT_TX;
         pl011_update(s);
@@ -333,8 +333,8 @@ static void pl011_realize(DeviceState *dev, Error **errp)
     PL011State *s = PL011(dev);
 
     if (s->chr.chr) {
-        qemu_chr_add_handlers(s->chr.chr, pl011_can_receive, pl011_receive,
-                              pl011_event, s);
+        qemu_chr_fe_set_handlers(&s->chr, pl011_can_receive, pl011_receive,
+                                 pl011_event, s, NULL);
     }
 }
 
diff --git a/hw/char/sclpconsole-lm.c b/hw/char/sclpconsole-lm.c
index 3ef1517274..0660cbcde4 100644
--- a/hw/char/sclpconsole-lm.c
+++ b/hw/char/sclpconsole-lm.c
@@ -91,7 +91,7 @@ static void chr_read(void *opaque, const uint8_t *buf, int size)
     if (scon->echo) {
         /* XXX this blocks entire thread. Rewrite to use
          * qemu_chr_fe_write and background I/O callbacks */
-        qemu_chr_fe_write_all(scon->chr.chr, buf, size);
+        qemu_chr_fe_write_all(&scon->chr, buf, size);
     }
 }
 
@@ -195,14 +195,14 @@ static int write_console_data(SCLPEvent *event, const uint8_t *buf, int len)
 {
     SCLPConsoleLM *scon = SCLPLM_CONSOLE(event);
 
-    if (!scon->chr.chr) {
+    if (!qemu_chr_fe_get_driver(&scon->chr)) {
         /* If there's no backend, we can just say we consumed all data. */
         return len;
     }
 
     /* XXX this blocks entire thread. Rewrite to use
      * qemu_chr_fe_write and background I/O callbacks */
-    return qemu_chr_fe_write_all(scon->chr.chr, buf, len);
+    return qemu_chr_fe_write_all(&scon->chr, buf, len);
 }
 
 static int process_mdb(SCLPEvent *event, MDBO *mdbo)
@@ -313,8 +313,8 @@ static int console_init(SCLPEvent *event)
     console_available = true;
 
     if (scon->chr.chr) {
-        qemu_chr_add_handlers(scon->chr.chr, chr_can_read,
-                              chr_read, NULL, scon);
+        qemu_chr_fe_set_handlers(&scon->chr, chr_can_read,
+                                 chr_read, NULL, scon, NULL);
     }
 
     return 0;
diff --git a/hw/char/sclpconsole.c b/hw/char/sclpconsole.c
index bb51a2c28d..0559208c24 100644
--- a/hw/char/sclpconsole.c
+++ b/hw/char/sclpconsole.c
@@ -163,14 +163,14 @@ static ssize_t write_console_data(SCLPEvent *event, const uint8_t *buf,
 {
     SCLPConsole *scon = SCLP_CONSOLE(event);
 
-    if (!scon->chr.chr) {
+    if (!qemu_chr_fe_get_driver(&scon->chr)) {
         /* If there's no backend, we can just say we consumed all data. */
         return len;
     }
 
     /* XXX this blocks entire thread. Rewrite to use
      * qemu_chr_fe_write and background I/O callbacks */
-    return qemu_chr_fe_write_all(scon->chr.chr, buf, len);
+    return qemu_chr_fe_write_all(&scon->chr, buf, len);
 }
 
 static int write_event_data(SCLPEvent *event, EventBufferHeader *evt_buf_hdr)
@@ -228,8 +228,8 @@ static int console_init(SCLPEvent *event)
     }
     console_available = true;
     if (scon->chr.chr) {
-        qemu_chr_add_handlers(scon->chr.chr, chr_can_read,
-                              chr_read, NULL, scon);
+        qemu_chr_fe_set_handlers(&scon->chr, chr_can_read,
+                                 chr_read, NULL, scon, NULL);
     }
 
     return 0;
diff --git a/hw/char/serial.c b/hw/char/serial.c
index 4489bf168f..509bc252df 100644
--- a/hw/char/serial.c
+++ b/hw/char/serial.c
@@ -182,7 +182,7 @@ static void serial_update_parameters(SerialState *s)
     ssp.data_bits = data_bits;
     ssp.stop_bits = stop_bits;
     s->char_transmit_time =  (NANOSECONDS_PER_SECOND / speed) * frame_size;
-    qemu_chr_fe_ioctl(s->chr.chr, CHR_IOCTL_SERIAL_SET_PARAMS, &ssp);
+    qemu_chr_fe_ioctl(&s->chr, CHR_IOCTL_SERIAL_SET_PARAMS, &ssp);
 
     DPRINTF("speed=%d parity=%c data=%d stop=%d\n",
            speed, parity, data_bits, stop_bits);
@@ -195,7 +195,7 @@ static void serial_update_msl(SerialState *s)
 
     timer_del(s->modem_status_poll);
 
-    if (qemu_chr_fe_ioctl(s->chr.chr, CHR_IOCTL_SERIAL_GET_TIOCM,
+    if (qemu_chr_fe_ioctl(&s->chr, CHR_IOCTL_SERIAL_GET_TIOCM,
                           &flags) == -ENOTSUP) {
         s->poll_msl = -1;
         return;
@@ -261,11 +261,11 @@ static void serial_xmit(SerialState *s)
         if (s->mcr & UART_MCR_LOOP) {
             /* in loopback mode, say that we just received a char */
             serial_receive1(s, &s->tsr, 1);
-        } else if (qemu_chr_fe_write(s->chr.chr, &s->tsr, 1) != 1 &&
+        } else if (qemu_chr_fe_write(&s->chr, &s->tsr, 1) != 1 &&
                    s->tsr_retry < MAX_XMIT_RETRY) {
             assert(s->watch_tag == 0);
             s->watch_tag =
-                qemu_chr_fe_add_watch(s->chr.chr, G_IO_OUT | G_IO_HUP,
+                qemu_chr_fe_add_watch(&s->chr, G_IO_OUT | G_IO_HUP,
                                       serial_watch_cb, s);
             if (s->watch_tag > 0) {
                 s->tsr_retry++;
@@ -419,8 +419,8 @@ static void serial_ioport_write(void *opaque, hwaddr addr, uint64_t val,
             break_enable = (val >> 6) & 1;
             if (break_enable != s->last_break_enable) {
                 s->last_break_enable = break_enable;
-                qemu_chr_fe_ioctl(s->chr.chr, CHR_IOCTL_SERIAL_SET_BREAK,
-                               &break_enable);
+                qemu_chr_fe_ioctl(&s->chr, CHR_IOCTL_SERIAL_SET_BREAK,
+                                  &break_enable);
             }
         }
         break;
@@ -434,8 +434,7 @@ static void serial_ioport_write(void *opaque, hwaddr addr, uint64_t val,
 
             if (s->poll_msl >= 0 && old_mcr != s->mcr) {
 
-                qemu_chr_fe_ioctl(s->chr.chr,
-                                  CHR_IOCTL_SERIAL_GET_TIOCM, &flags);
+                qemu_chr_fe_ioctl(&s->chr, CHR_IOCTL_SERIAL_GET_TIOCM, &flags);
 
                 flags &= ~(CHR_TIOCM_RTS | CHR_TIOCM_DTR);
 
@@ -444,8 +443,7 @@ static void serial_ioport_write(void *opaque, hwaddr addr, uint64_t val,
                 if (val & UART_MCR_DTR)
                     flags |= CHR_TIOCM_DTR;
 
-                qemu_chr_fe_ioctl(s->chr.chr,
-                                  CHR_IOCTL_SERIAL_SET_TIOCM, &flags);
+                qemu_chr_fe_ioctl(&s->chr, CHR_IOCTL_SERIAL_SET_TIOCM, &flags);
                 /* Update the modem status after a one-character-send wait-time, since there may be a response
                    from the device/computer at the other end of the serial line */
                 timer_mod(s->modem_status_poll, qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) + s->char_transmit_time);
@@ -490,7 +488,7 @@ static uint64_t serial_ioport_read(void *opaque, hwaddr addr, unsigned size)
             serial_update_irq(s);
             if (!(s->mcr & UART_MCR_LOOP)) {
                 /* in loopback mode, don't receive any data */
-                qemu_chr_fe_accept_input(s->chr.chr);
+                qemu_chr_fe_accept_input(&s->chr);
             }
         }
         break;
@@ -663,7 +661,7 @@ static int serial_post_load(void *opaque, int version_id)
         }
 
         assert(s->watch_tag == 0);
-        s->watch_tag = qemu_chr_fe_add_watch(s->chr.chr, G_IO_OUT | G_IO_HUP,
+        s->watch_tag = qemu_chr_fe_add_watch(&s->chr, G_IO_OUT | G_IO_HUP,
                                              serial_watch_cb, s);
     } else {
         /* tsr_retry == 0 implies LSR.TEMT = 1 (transmitter empty).  */
@@ -888,7 +886,7 @@ static void serial_reset(void *opaque)
 
 void serial_realize_core(SerialState *s, Error **errp)
 {
-    if (!s->chr.chr) {
+    if (!qemu_chr_fe_get_driver(&s->chr)) {
         error_setg(errp, "Can't create serial device, empty char device");
         return;
     }
@@ -898,8 +896,8 @@ void serial_realize_core(SerialState *s, Error **errp)
     s->fifo_timeout_timer = timer_new_ns(QEMU_CLOCK_VIRTUAL, (QEMUTimerCB *) fifo_timeout_int, s);
     qemu_register_reset(serial_reset, s);
 
-    qemu_chr_add_handlers(s->chr.chr, serial_can_receive1, serial_receive1,
-                          serial_event, s);
+    qemu_chr_fe_set_handlers(&s->chr, serial_can_receive1, serial_receive1,
+                             serial_event, s, NULL);
     fifo8_create(&s->recv_fifo, UART_FIFO_LENGTH);
     fifo8_create(&s->xmit_fifo, UART_FIFO_LENGTH);
     serial_reset(s);
@@ -907,7 +905,7 @@ void serial_realize_core(SerialState *s, Error **errp)
 
 void serial_exit_core(SerialState *s)
 {
-    qemu_chr_add_handlers(s->chr.chr, NULL, NULL, NULL, NULL);
+    qemu_chr_fe_set_handlers(&s->chr, NULL, NULL, NULL, NULL, NULL);
     qemu_unregister_reset(serial_reset, s);
 }
 
diff --git a/hw/char/sh_serial.c b/hw/char/sh_serial.c
index c8b91bbaa2..8d82986d35 100644
--- a/hw/char/sh_serial.c
+++ b/hw/char/sh_serial.c
@@ -110,11 +110,11 @@ static void sh_serial_write(void *opaque, hwaddr offs,
         }
         return;
     case 0x0c: /* FTDR / TDR */
-        if (s->chr.chr) {
+        if (qemu_chr_fe_get_driver(&s->chr)) {
             ch = val;
             /* XXX this blocks entire thread. Rewrite to use
              * qemu_chr_fe_write and background I/O callbacks */
-            qemu_chr_fe_write_all(s->chr.chr, &ch, 1);
+            qemu_chr_fe_write_all(&s->chr, &ch, 1);
 	}
 	s->dr = val;
 	s->flags &= ~SH_SERIAL_FLAG_TDE;
@@ -399,8 +399,9 @@ void sh_serial_init(MemoryRegion *sysmem,
     if (chr) {
         qemu_chr_fe_claim_no_fail(chr);
         qemu_chr_fe_init(&s->chr, chr, &error_abort);
-        qemu_chr_add_handlers(chr, sh_serial_can_receive1, sh_serial_receive1,
-			      sh_serial_event, s);
+        qemu_chr_fe_set_handlers(&s->chr, sh_serial_can_receive1,
+                                 sh_serial_receive1,
+                                 sh_serial_event, s, NULL);
     }
 
     s->eri = eri_source;
diff --git a/hw/char/spapr_vty.c b/hw/char/spapr_vty.c
index 7afc6a5094..8d39d40a4d 100644
--- a/hw/char/spapr_vty.c
+++ b/hw/char/spapr_vty.c
@@ -51,7 +51,7 @@ static int vty_getchars(VIOsPAPRDevice *sdev, uint8_t *buf, int max)
         buf[n++] = dev->buf[dev->out++ % VTERM_BUFSIZE];
     }
 
-    qemu_chr_fe_accept_input(dev->chardev.chr);
+    qemu_chr_fe_accept_input(&dev->chardev);
 
     return n;
 }
@@ -62,20 +62,20 @@ void vty_putchars(VIOsPAPRDevice *sdev, uint8_t *buf, int len)
 
     /* XXX this blocks entire thread. Rewrite to use
      * qemu_chr_fe_write and background I/O callbacks */
-    qemu_chr_fe_write_all(dev->chardev.chr, buf, len);
+    qemu_chr_fe_write_all(&dev->chardev, buf, len);
 }
 
 static void spapr_vty_realize(VIOsPAPRDevice *sdev, Error **errp)
 {
     VIOsPAPRVTYDevice *dev = VIO_SPAPR_VTY_DEVICE(sdev);
 
-    if (!dev->chardev.chr) {
+    if (!qemu_chr_fe_get_driver(&dev->chardev)) {
         error_setg(errp, "chardev property not set");
         return;
     }
 
-    qemu_chr_add_handlers(dev->chardev.chr, vty_can_receive,
-                          vty_receive, NULL, dev);
+    qemu_chr_fe_set_handlers(&dev->chardev, vty_can_receive,
+                             vty_receive, NULL, dev, NULL);
 }
 
 /* Forward declaration */
diff --git a/hw/char/stm32f2xx_usart.c b/hw/char/stm32f2xx_usart.c
index 8619d10e04..03ccc52384 100644
--- a/hw/char/stm32f2xx_usart.c
+++ b/hw/char/stm32f2xx_usart.c
@@ -98,7 +98,7 @@ static uint64_t stm32f2xx_usart_read(void *opaque, hwaddr addr,
         retvalue = s->usart_sr;
         s->usart_sr &= ~USART_SR_TC;
         if (s->chr.chr) {
-            qemu_chr_fe_accept_input(s->chr.chr);
+            qemu_chr_fe_accept_input(&s->chr);
         }
         return retvalue;
     case USART_DR:
@@ -106,7 +106,7 @@ static uint64_t stm32f2xx_usart_read(void *opaque, hwaddr addr,
         s->usart_sr |= USART_SR_TXE;
         s->usart_sr &= ~USART_SR_RXNE;
         if (s->chr.chr) {
-            qemu_chr_fe_accept_input(s->chr.chr);
+            qemu_chr_fe_accept_input(&s->chr);
         }
         qemu_set_irq(s->irq, 0);
         return s->usart_dr & 0x3FF;
@@ -155,7 +155,7 @@ static void stm32f2xx_usart_write(void *opaque, hwaddr addr,
             if (s->chr.chr) {
                 /* XXX this blocks entire thread. Rewrite to use
                  * qemu_chr_fe_write and background I/O callbacks */
-                qemu_chr_fe_write_all(s->chr.chr, &ch, 1);
+                qemu_chr_fe_write_all(&s->chr, &ch, 1);
             }
             s->usart_sr |= USART_SR_TC;
             s->usart_sr &= ~USART_SR_TXE;
@@ -213,8 +213,8 @@ static void stm32f2xx_usart_realize(DeviceState *dev, Error **errp)
     STM32F2XXUsartState *s = STM32F2XX_USART(dev);
 
     if (s->chr.chr) {
-        qemu_chr_add_handlers(s->chr.chr, stm32f2xx_usart_can_receive,
-                              stm32f2xx_usart_receive, NULL, s);
+        qemu_chr_fe_set_handlers(&s->chr, stm32f2xx_usart_can_receive,
+                                 stm32f2xx_usart_receive, NULL, s, NULL);
     }
 }
 
diff --git a/hw/char/virtio-console.c b/hw/char/virtio-console.c
index 93acbeccf4..135f589f54 100644
--- a/hw/char/virtio-console.c
+++ b/hw/char/virtio-console.c
@@ -49,12 +49,12 @@ static ssize_t flush_buf(VirtIOSerialPort *port,
     VirtConsole *vcon = VIRTIO_CONSOLE(port);
     ssize_t ret;
 
-    if (!vcon->chr.chr) {
+    if (!qemu_chr_fe_get_driver(&vcon->chr)) {
         /* If there's no backend, we can just say we consumed all data. */
         return len;
     }
 
-    ret = qemu_chr_fe_write(vcon->chr.chr, buf, len);
+    ret = qemu_chr_fe_write(&vcon->chr, buf, len);
     trace_virtio_console_flush_buf(port->id, len, ret);
 
     if (ret < len) {
@@ -92,8 +92,8 @@ static ssize_t flush_buf(VirtIOSerialPort *port,
         if (!k->is_console) {
             virtio_serial_throttle_port(port, true);
             if (!vcon->watch) {
-                vcon->watch = qemu_chr_fe_add_watch(vcon->chr.chr,
-                                                    G_IO_OUT | G_IO_HUP,
+                vcon->watch = qemu_chr_fe_add_watch(&vcon->chr,
+                                                    G_IO_OUT|G_IO_HUP,
                                                     chr_write_unblocked, vcon);
             }
         }
@@ -109,7 +109,7 @@ static void set_guest_connected(VirtIOSerialPort *port, int guest_connected)
     VirtIOSerialPortClass *k = VIRTIO_SERIAL_PORT_GET_CLASS(port);
 
     if (vcon->chr.chr && !k->is_console) {
-        qemu_chr_fe_set_open(vcon->chr.chr, guest_connected);
+        qemu_chr_fe_set_open(&vcon->chr, guest_connected);
     }
 
     if (dev->id) {
@@ -123,7 +123,7 @@ static void guest_writable(VirtIOSerialPort *port)
     VirtConsole *vcon = VIRTIO_CONSOLE(port);
 
     if (vcon->chr.chr) {
-        qemu_chr_fe_accept_input(vcon->chr.chr);
+        qemu_chr_fe_accept_input(&vcon->chr);
     }
 }
 
@@ -170,6 +170,7 @@ static void virtconsole_realize(DeviceState *dev, Error **errp)
     VirtIOSerialPort *port = VIRTIO_SERIAL_PORT(dev);
     VirtConsole *vcon = VIRTIO_CONSOLE(dev);
     VirtIOSerialPortClass *k = VIRTIO_SERIAL_PORT_GET_CLASS(dev);
+    CharDriverState *chr = qemu_chr_fe_get_driver(&vcon->chr);
 
     if (port->id == 0 && !k->is_console) {
         error_setg(errp, "Port number 0 on virtio-serial devices reserved "
@@ -177,7 +178,7 @@ static void virtconsole_realize(DeviceState *dev, Error **errp)
         return;
     }
 
-    if (vcon->chr.chr) {
+    if (chr) {
         /*
          * For consoles we don't block guest data transfer just
          * because nothing is connected - we'll just let it go
@@ -188,14 +189,14 @@ static void virtconsole_realize(DeviceState *dev, Error **errp)
          * trigger open/close of the device
          */
         if (k->is_console) {
-            vcon->chr.chr->explicit_fe_open = 0;
-            qemu_chr_add_handlers(vcon->chr.chr, chr_can_read, chr_read,
-                                  NULL, vcon);
+            chr->explicit_fe_open = 0;
+            qemu_chr_fe_set_handlers(&vcon->chr, chr_can_read, chr_read,
+                                     NULL, vcon, NULL);
             virtio_serial_open(port);
         } else {
-            vcon->chr.chr->explicit_fe_open = 1;
-            qemu_chr_add_handlers(vcon->chr.chr, chr_can_read, chr_read,
-                                  chr_event, vcon);
+            chr->explicit_fe_open = 1;
+            qemu_chr_fe_set_handlers(&vcon->chr, chr_can_read, chr_read,
+                                     chr_event, vcon, NULL);
         }
     }
 }
diff --git a/hw/char/xen_console.c b/hw/char/xen_console.c
index c1d36dc2d0..5e5aca1ed6 100644
--- a/hw/char/xen_console.c
+++ b/hw/char/xen_console.c
@@ -23,6 +23,7 @@
 #include <sys/select.h>
 #include <termios.h>
 
+#include "qapi/error.h"
 #include "hw/hw.h"
 #include "sysemu/char.h"
 #include "hw/xen/xen_backend.h"
@@ -149,8 +150,8 @@ static void xencons_send(struct XenConsole *con)
     ssize_t len, size;
 
     size = con->buffer.size - con->buffer.consumed;
-    if (con->chr.chr) {
-        len = qemu_chr_fe_write(con->chr.chr,
+    if (qemu_chr_fe_get_driver(&con->chr)) {
+        len = qemu_chr_fe_write(&con->chr,
                                 con->buffer.data + con->buffer.consumed,
                                 size);
     } else {
@@ -209,7 +210,8 @@ static int con_init(struct XenDevice *xendev)
                          qemu_chr_new(label, output), &error_abort);
     }
 
-    xenstore_store_pv_console_info(con->xendev.dev, con->chr.chr);
+    xenstore_store_pv_console_info(con->xendev.dev,
+                                   qemu_chr_fe_get_driver(&con->chr));
 
 out:
     g_free(type);
@@ -244,8 +246,8 @@ static int con_initialise(struct XenDevice *xendev)
     xen_be_bind_evtchn(&con->xendev);
     if (con->chr.chr) {
         if (qemu_chr_fe_claim(con->chr.chr) == 0) {
-            qemu_chr_add_handlers(con->chr.chr, xencons_can_receive,
-                                  xencons_receive, NULL, con);
+            qemu_chr_fe_set_handlers(&con->chr, xencons_can_receive,
+                                     xencons_receive, NULL, con, NULL);
         } else {
             xen_be_printf(xendev, 0,
                           "xen_console_init error chardev %s already used\n",
@@ -267,7 +269,7 @@ static void con_disconnect(struct XenDevice *xendev)
     struct XenConsole *con = container_of(xendev, struct XenConsole, xendev);
 
     if (con->chr.chr) {
-        qemu_chr_add_handlers(con->chr.chr, NULL, NULL, NULL, NULL);
+        qemu_chr_fe_set_handlers(&con->chr, NULL, NULL, NULL, NULL, NULL);
         qemu_chr_fe_release(con->chr.chr);
     }
     xen_be_unbind_evtchn(&con->xendev);
diff --git a/hw/char/xilinx_uartlite.c b/hw/char/xilinx_uartlite.c
index 185c63baf3..d6df64335d 100644
--- a/hw/char/xilinx_uartlite.c
+++ b/hw/char/xilinx_uartlite.c
@@ -107,7 +107,7 @@ uart_read(void *opaque, hwaddr addr, unsigned int size)
                 s->rx_fifo_len--;
             uart_update_status(s);
             uart_update_irq(s);
-            qemu_chr_fe_accept_input(s->chr.chr);
+            qemu_chr_fe_accept_input(&s->chr);
             break;
 
         default:
@@ -146,7 +146,7 @@ uart_write(void *opaque, hwaddr addr,
             if (s->chr.chr) {
                 /* XXX this blocks entire thread. Rewrite to use
                  * qemu_chr_fe_write and background I/O callbacks */
-                qemu_chr_fe_write_all(s->chr.chr, &ch, 1);
+                qemu_chr_fe_write_all(&s->chr, &ch, 1);
             }
             s->regs[addr] = value;
 
@@ -214,7 +214,8 @@ static void xilinx_uartlite_realize(DeviceState *dev, Error **errp)
     XilinxUARTLite *s = XILINX_UARTLITE(dev);
 
     if (s->chr.chr) {
-        qemu_chr_add_handlers(s->chr.chr, uart_can_rx, uart_rx, uart_event, s);
+        qemu_chr_fe_set_handlers(&s->chr, uart_can_rx, uart_rx,
+                                 uart_event, s, NULL);
     }
 }