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Re: [Xen-devel] [PATCH 1/2 v3] xenfb: Use Input Handlers directly



Anthony,

The code looks good. I tested this patch with Linux guests and seems to
work OK, can you also confirm?

One comment below.


On Wed, 26 Jul 2017, Owen Smith wrote:
> Avoid the unneccessary calls through the input-legacy.c file by
> using the qemu_input_handler_*() calls directly. This did require
> reworking the event and sync handlers and a direct mapping from
> QEMU's qcodes to linux KEY_* identifiers required by the ring
> protocol. Removes the scancode2linux mapping, and supporting
> documention.
> 
> Signed-off-by: Owen Smith <owen.smith@xxxxxxxxxx>
> ---
>  hw/display/xenfb.c | 401 
> +++++++++++++++++++++++++++++++++--------------------
>  1 file changed, 247 insertions(+), 154 deletions(-)
> 
> diff --git a/hw/display/xenfb.c b/hw/display/xenfb.c
> index df8b78f..e412753 100644
> --- a/hw/display/xenfb.c
> +++ b/hw/display/xenfb.c
> @@ -27,6 +27,7 @@
>  #include "qemu/osdep.h"
>  
>  #include "hw/hw.h"
> +#include "ui/input.h"
>  #include "ui/console.h"
>  #include "hw/xen/xen_backend.h"
>  
> @@ -37,9 +38,7 @@
>  
>  #include "trace.h"
>  
> -#ifndef BTN_LEFT
> -#define BTN_LEFT 0x110 /* from <linux/input.h> */
> -#endif
> +#include "standard-headers/linux/input.h"
>  
>  /* -------------------------------------------------------------------- */
>  
> @@ -51,9 +50,10 @@ struct common {
>  struct XenInput {
>      struct common c;
>      int abs_pointer_wanted; /* Whether guest supports absolute pointer */
> -    int button_state;       /* Last seen pointer button state */
> -    int extended;
> -    QEMUPutMouseEntry *qmouse;
> +    QemuInputHandlerState *qkbd;
> +    QemuInputHandlerState *qmou;
> +    int mouse_axes[INPUT_AXIS__MAX];
> +    int mouse_wheel;
>  };
>  
>  #define UP_QUEUE 8
> @@ -120,77 +120,125 @@ static void common_unbind(struct common *c)
>  
>  /* -------------------------------------------------------------------- */
>  
> -#if 0
> -/*
> - * These two tables are not needed any more, but left in here
> - * intentionally as documentation, to show how scancode2linux[]
> - * was generated.
> - *
> - * Tables to map from scancode to Linux input layer keycode.
> - * Scancodes are hardware-specific.  These maps assumes a
> - * standard AT or PS/2 keyboard which is what QEMU feeds us.
> - */
> -const unsigned char atkbd_set2_keycode[512] = {
> -
> -     0, 67, 65, 63, 61, 59, 60, 88,  0, 68, 66, 64, 62, 15, 41,117,
> -     0, 56, 42, 93, 29, 16,  2,  0,  0,  0, 44, 31, 30, 17,  3,  0,
> -     0, 46, 45, 32, 18,  5,  4, 95,  0, 57, 47, 33, 20, 19,  6,183,
> -     0, 49, 48, 35, 34, 21,  7,184,  0,  0, 50, 36, 22,  8,  9,185,
> -     0, 51, 37, 23, 24, 11, 10,  0,  0, 52, 53, 38, 39, 25, 12,  0,
> -     0, 89, 40,  0, 26, 13,  0,  0, 58, 54, 28, 27,  0, 43,  0, 85,
> -     0, 86, 91, 90, 92,  0, 14, 94,  0, 79,124, 75, 71,121,  0,  0,
> -    82, 83, 80, 76, 77, 72,  1, 69, 87, 78, 81, 74, 55, 73, 70, 99,
> -
> -      0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,
> -    217,100,255,  0, 97,165,  0,  0,156,  0,  0,  0,  0,  0,  0,125,
> -    173,114,  0,113,  0,  0,  0,126,128,  0,  0,140,  0,  0,  0,127,
> -    159,  0,115,  0,164,  0,  0,116,158,  0,150,166,  0,  0,  0,142,
> -    157,  0,  0,  0,  0,  0,  0,  0,155,  0, 98,  0,  0,163,  0,  0,
> -    226,  0,  0,  0,  0,  0,  0,  0,  0,255, 96,  0,  0,  0,143,  0,
> -      0,  0,  0,  0,  0,  0,  0,  0,  0,107,  0,105,102,  0,  0,112,
> -    110,111,108,112,106,103,  0,119,  0,118,109,  0, 99,104,119,  0,
> -
> -};
> -
> -const unsigned char atkbd_unxlate_table[128] = {
> -
> -      0,118, 22, 30, 38, 37, 46, 54, 61, 62, 70, 69, 78, 85,102, 13,
> -     21, 29, 36, 45, 44, 53, 60, 67, 68, 77, 84, 91, 90, 20, 28, 27,
> -     35, 43, 52, 51, 59, 66, 75, 76, 82, 14, 18, 93, 26, 34, 33, 42,
> -     50, 49, 58, 65, 73, 74, 89,124, 17, 41, 88,  5,  6,  4, 12,  3,
> -     11,  2, 10,  1,  9,119,126,108,117,125,123,107,115,116,121,105,
> -    114,122,112,113,127, 96, 97,120,  7, 15, 23, 31, 39, 47, 55, 63,
> -     71, 79, 86, 94,  8, 16, 24, 32, 40, 48, 56, 64, 72, 80, 87,111,
> -     19, 25, 57, 81, 83, 92, 95, 98, 99,100,101,103,104,106,109,110
> -
> +static const unsigned int keymap_qcode[Q_KEY_CODE__MAX] = {
> +    [Q_KEY_CODE_ESC]                 = KEY_ESC,
> +    [Q_KEY_CODE_1]                   = KEY_1,
> +    [Q_KEY_CODE_2]                   = KEY_2,
> +    [Q_KEY_CODE_3]                   = KEY_3,
> +    [Q_KEY_CODE_4]                   = KEY_4,
> +    [Q_KEY_CODE_5]                   = KEY_5,
> +    [Q_KEY_CODE_6]                   = KEY_6,
> +    [Q_KEY_CODE_7]                   = KEY_7,
> +    [Q_KEY_CODE_8]                   = KEY_8,
> +    [Q_KEY_CODE_9]                   = KEY_9,
> +    [Q_KEY_CODE_0]                   = KEY_0,
> +    [Q_KEY_CODE_MINUS]               = KEY_MINUS,
> +    [Q_KEY_CODE_EQUAL]               = KEY_EQUAL,
> +    [Q_KEY_CODE_BACKSPACE]           = KEY_BACKSPACE,
> +
> +    [Q_KEY_CODE_TAB]                 = KEY_TAB,
> +    [Q_KEY_CODE_Q]                   = KEY_Q,
> +    [Q_KEY_CODE_W]                   = KEY_W,
> +    [Q_KEY_CODE_E]                   = KEY_E,
> +    [Q_KEY_CODE_R]                   = KEY_R,
> +    [Q_KEY_CODE_T]                   = KEY_T,
> +    [Q_KEY_CODE_Y]                   = KEY_Y,
> +    [Q_KEY_CODE_U]                   = KEY_U,
> +    [Q_KEY_CODE_I]                   = KEY_I,
> +    [Q_KEY_CODE_O]                   = KEY_O,
> +    [Q_KEY_CODE_P]                   = KEY_P,
> +    [Q_KEY_CODE_BRACKET_LEFT]        = KEY_LEFTBRACE,
> +    [Q_KEY_CODE_BRACKET_RIGHT]       = KEY_RIGHTBRACE,
> +    [Q_KEY_CODE_RET]                 = KEY_ENTER,
> +
> +    [Q_KEY_CODE_CTRL]                = KEY_LEFTCTRL,
> +    [Q_KEY_CODE_A]                   = KEY_A,
> +    [Q_KEY_CODE_S]                   = KEY_S,
> +    [Q_KEY_CODE_D]                   = KEY_D,
> +    [Q_KEY_CODE_F]                   = KEY_F,
> +    [Q_KEY_CODE_G]                   = KEY_G,
> +    [Q_KEY_CODE_H]                   = KEY_H,
> +    [Q_KEY_CODE_J]                   = KEY_J,
> +    [Q_KEY_CODE_K]                   = KEY_K,
> +    [Q_KEY_CODE_L]                   = KEY_L,
> +    [Q_KEY_CODE_SEMICOLON]           = KEY_SEMICOLON,
> +    [Q_KEY_CODE_APOSTROPHE]          = KEY_APOSTROPHE,
> +    [Q_KEY_CODE_GRAVE_ACCENT]        = KEY_GRAVE,
> +
> +    [Q_KEY_CODE_SHIFT]               = KEY_LEFTSHIFT,
> +    [Q_KEY_CODE_BACKSLASH]           = KEY_BACKSLASH,
> +    [Q_KEY_CODE_LESS]                = KEY_102ND,
> +    [Q_KEY_CODE_Z]                   = KEY_Z,
> +    [Q_KEY_CODE_X]                   = KEY_X,
> +    [Q_KEY_CODE_C]                   = KEY_C,
> +    [Q_KEY_CODE_V]                   = KEY_V,
> +    [Q_KEY_CODE_B]                   = KEY_B,
> +    [Q_KEY_CODE_N]                   = KEY_N,
> +    [Q_KEY_CODE_M]                   = KEY_M,
> +    [Q_KEY_CODE_COMMA]               = KEY_COMMA,
> +    [Q_KEY_CODE_DOT]                 = KEY_DOT,
> +    [Q_KEY_CODE_SLASH]               = KEY_SLASH,
> +    [Q_KEY_CODE_SHIFT_R]             = KEY_RIGHTSHIFT,
> +
> +    [Q_KEY_CODE_ALT]                 = KEY_LEFTALT,
> +    [Q_KEY_CODE_SPC]                 = KEY_SPACE,
> +    [Q_KEY_CODE_CAPS_LOCK]           = KEY_CAPSLOCK,
> +
> +    [Q_KEY_CODE_F1]                  = KEY_F1,
> +    [Q_KEY_CODE_F2]                  = KEY_F2,
> +    [Q_KEY_CODE_F3]                  = KEY_F3,
> +    [Q_KEY_CODE_F4]                  = KEY_F4,
> +    [Q_KEY_CODE_F5]                  = KEY_F5,
> +    [Q_KEY_CODE_F6]                  = KEY_F6,
> +    [Q_KEY_CODE_F7]                  = KEY_F7,
> +    [Q_KEY_CODE_F8]                  = KEY_F8,
> +    [Q_KEY_CODE_F9]                  = KEY_F9,
> +    [Q_KEY_CODE_F10]                 = KEY_F10,
> +    [Q_KEY_CODE_NUM_LOCK]            = KEY_NUMLOCK,
> +    [Q_KEY_CODE_SCROLL_LOCK]         = KEY_SCROLLLOCK,
> +
> +    [Q_KEY_CODE_KP_0]                = KEY_KP0,
> +    [Q_KEY_CODE_KP_1]                = KEY_KP1,
> +    [Q_KEY_CODE_KP_2]                = KEY_KP2,
> +    [Q_KEY_CODE_KP_3]                = KEY_KP3,
> +    [Q_KEY_CODE_KP_4]                = KEY_KP4,
> +    [Q_KEY_CODE_KP_5]                = KEY_KP5,
> +    [Q_KEY_CODE_KP_6]                = KEY_KP6,
> +    [Q_KEY_CODE_KP_7]                = KEY_KP7,
> +    [Q_KEY_CODE_KP_8]                = KEY_KP8,
> +    [Q_KEY_CODE_KP_9]                = KEY_KP9,
> +    [Q_KEY_CODE_KP_SUBTRACT]         = KEY_KPMINUS,
> +    [Q_KEY_CODE_KP_ADD]              = KEY_KPPLUS,
> +    [Q_KEY_CODE_KP_DECIMAL]          = KEY_KPDOT,
> +    [Q_KEY_CODE_KP_ENTER]            = KEY_KPENTER,
> +    [Q_KEY_CODE_KP_DIVIDE]           = KEY_KPSLASH,
> +    [Q_KEY_CODE_KP_MULTIPLY]         = KEY_KPASTERISK,
> +
> +    [Q_KEY_CODE_F11]                 = KEY_F11,
> +    [Q_KEY_CODE_F12]                 = KEY_F12,
> +
> +    [Q_KEY_CODE_CTRL_R]              = KEY_RIGHTCTRL,
> +    [Q_KEY_CODE_SYSRQ]               = KEY_SYSRQ,
> +    [Q_KEY_CODE_PRINT]               = KEY_SYSRQ,

I take that KEY_PRINT is not supported by the protocol?


> +    [Q_KEY_CODE_PAUSE]               = KEY_PAUSE,
> +    [Q_KEY_CODE_ALT_R]               = KEY_RIGHTALT,
> +
> +    [Q_KEY_CODE_HOME]                = KEY_HOME,
> +    [Q_KEY_CODE_UP]                  = KEY_UP,
> +    [Q_KEY_CODE_PGUP]                = KEY_PAGEUP,
> +    [Q_KEY_CODE_LEFT]                = KEY_LEFT,
> +    [Q_KEY_CODE_RIGHT]               = KEY_RIGHT,
> +    [Q_KEY_CODE_END]                 = KEY_END,
> +    [Q_KEY_CODE_DOWN]                = KEY_DOWN,
> +    [Q_KEY_CODE_PGDN]                = KEY_PAGEDOWN,
> +    [Q_KEY_CODE_INSERT]              = KEY_INSERT,
> +    [Q_KEY_CODE_DELETE]              = KEY_DELETE,
> +
> +    [Q_KEY_CODE_META_L]              = KEY_LEFTMETA,
> +    [Q_KEY_CODE_META_R]              = KEY_RIGHTMETA,
> +    [Q_KEY_CODE_MENU]                = KEY_MENU,
>  };
> -#endif
>  
> -/*
> - * for (i = 0; i < 128; i++) {
> - *     scancode2linux[i] = atkbd_set2_keycode[atkbd_unxlate_table[i]];
> - *     scancode2linux[i | 0x80] = atkbd_set2_keycode[atkbd_unxlate_table[i] 
> | 0x80];
> - * }
> - */
> -static const unsigned char scancode2linux[512] = {
> -      0,  1,  2,  3,  4,  5,  6,  7,  8,  9, 10, 11, 12, 13, 14, 15,
> -     16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31,
> -     32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47,
> -     48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63,
> -     64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79,
> -     80, 81, 82, 83, 99,  0, 86, 87, 88,117,  0,  0, 95,183,184,185,
> -      0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,
> -     93,  0,  0, 89,  0,  0, 85, 91, 90, 92,  0, 94,  0,124,121,  0,
> -
> -      0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,
> -    165,  0,  0,  0,  0,  0,  0,  0,  0,163,  0,  0, 96, 97,  0,  0,
> -    113,140,164,  0,166,  0,  0,  0,  0,  0,255,  0,  0,  0,114,  0,
> -    115,  0,150,  0,  0, 98,255, 99,100,  0,  0,  0,  0,  0,  0,  0,
> -      0,  0,  0,  0,  0,119,119,102,103,104,  0,105,112,106,118,107,
> -    108,109,110,111,  0,  0,  0,  0,  0,  0,  0,125,126,127,116,142,
> -      0,  0,  0,143,  0,217,156,173,128,159,158,157,155,226,  0,112,
> -      0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,
> -};
>  
>  /* Send an event to the keyboard frontend driver */
>  static int xenfb_kbd_event(struct XenInput *xenfb,
> @@ -260,87 +308,123 @@ static int xenfb_send_position(struct XenInput *xenfb,
>      return xenfb_kbd_event(xenfb, &event);
>  }
>  
> -/*
> - * Send a key event from the client to the guest OS
> - * QEMU gives us a raw scancode from an AT / PS/2 style keyboard.
> - * We have to turn this into a Linux Input layer keycode.
> - *
> - * Extra complexity from the fact that with extended scancodes
> - * (like those produced by arrow keys) this method gets called
> - * twice, but we only want to send a single event. So we have to
> - * track the '0xe0' scancode state & collapse the extended keys
> - * as needed.
> - *
> - * Wish we could just send scancodes straight to the guest which
> - * already has code for dealing with this...
> - */
> -static void xenfb_key_event(void *opaque, int scancode)
> +static void xenfb_key_event(DeviceState *dev, QemuConsole *src,
> +                            InputEvent *evt)
>  {
> -    struct XenInput *xenfb = opaque;
> -    int down = 1;
> +    struct XenInput *in = (struct XenInput *)dev;
> +    InputKeyEvent *key = evt->u.key.data;
> +    int qcode = qemu_input_key_value_to_qcode(key->key);
>  
> -    if (scancode == 0xe0) {
> -     xenfb->extended = 1;
> -     return;
> -    } else if (scancode & 0x80) {
> -     scancode &= 0x7f;
> -     down = 0;
> +    if (qcode && keymap_qcode[qcode]) {
> +        xenfb_send_key(in, key->down, keymap_qcode[qcode]);
>      }
> -    if (xenfb->extended) {
> -     scancode |= 0x80;
> -     xenfb->extended = 0;
> +}
> +
> +static void xenfb_mouse_event(DeviceState *dev, QemuConsole *src,
> +                              InputEvent *evt)
> +{
> +    struct XenInput *in = (struct XenInput *)dev;
> +    InputBtnEvent *btn;
> +    InputMoveEvent *move;
> +
> +    switch (evt->type) {
> +    case INPUT_EVENT_KIND_BTN:
> +        btn = evt->u.btn.data;
> +        switch (btn->button) {
> +        case INPUT_BUTTON_LEFT:
> +            xenfb_send_key(in, btn->down, BTN_LEFT);
> +            break;
> +        case INPUT_BUTTON_RIGHT:
> +            xenfb_send_key(in, btn->down, BTN_RIGHT);
> +            break;
> +        case INPUT_BUTTON_MIDDLE:
> +            xenfb_send_key(in, btn->down, BTN_MIDDLE);
> +            break;
> +        case INPUT_BUTTON_WHEEL_UP:
> +            if (btn->down) {
> +                in->mouse_wheel--;
> +            }
> +            break;
> +        case INPUT_BUTTON_WHEEL_DOWN:
> +            if (btn->down) {
> +                in->mouse_wheel++;
> +            }
> +            break;
> +        default:
> +            break;
> +        }
> +        break;
> +    case INPUT_EVENT_KIND_ABS:
> +        move = evt->u.abs.data;
> +        in->mouse_axes[move->axis] = move->value;
> +        break;
> +    case INPUT_EVENT_KIND_REL:
> +        move = evt->u.rel.data;
> +        in->mouse_axes[move->axis] += move->value;
> +        break;
> +    default:
> +        break;
>      }
> -    xenfb_send_key(xenfb, down, scancode2linux[scancode]);
>  }
>  
> -/*
> - * Send a mouse event from the client to the guest OS
> - *
> - * The QEMU mouse can be in either relative, or absolute mode.
> - * Movement is sent separately from button state, which has to
> - * be encoded as virtual key events. We also don't actually get
> - * given any button up/down events, so have to track changes in
> - * the button state.
> - */
> -static void xenfb_mouse_event(void *opaque,
> -                           int dx, int dy, int dz, int button_state)
> +static void xenfb_mouse_sync(DeviceState *dev)
>  {
> -    struct XenInput *xenfb = opaque;
> -    QemuConsole *con = qemu_console_lookup_by_index(0);
> -    DisplaySurface *surface;
> -    int dw, dh, i;
> +    struct XenInput *in = (struct XenInput *)dev;
> +    int dx, dy, dz;
>  
> -    if (!con) {
> -        xen_pv_printf(&xenfb->c.xendev, 0, "No QEMU console available");
> -        return;
> -    }
> +    dx = in->mouse_axes[INPUT_AXIS_X];
> +    dy = in->mouse_axes[INPUT_AXIS_Y];
> +    dz = in->mouse_wheel;
> +
> +    trace_xenfb_mouse_event(in, dx, dy, dz, 0,
> +                            in->abs_pointer_wanted);
> +
> +    if (in->abs_pointer_wanted) {
> +        QemuConsole *con = qemu_console_lookup_by_index(0);
> +        DisplaySurface *surface;
> +        int dw, dh;
> +
> +        if (!con) {
> +            xen_pv_printf(&in->c.xendev, 0, "No QEMU console available");
> +            return;
> +        }
>  
> -    surface = qemu_console_surface(con);
> -    dw = surface_width(surface);
> -    dh = surface_height(surface);
> -
> -    trace_xenfb_mouse_event(opaque, dx, dy, dz, button_state,
> -                            xenfb->abs_pointer_wanted);
> -    if (xenfb->abs_pointer_wanted)
> -     xenfb_send_position(xenfb,
> -                         dx * (dw - 1) / 0x7fff,
> -                         dy * (dh - 1) / 0x7fff,
> -                         dz);
> -    else
> -     xenfb_send_motion(xenfb, dx, dy, dz);
> -
> -    for (i = 0 ; i < 8 ; i++) {
> -     int lastDown = xenfb->button_state & (1 << i);
> -     int down = button_state & (1 << i);
> -     if (down == lastDown)
> -         continue;
> -
> -     if (xenfb_send_key(xenfb, down, BTN_LEFT+i) < 0)
> -         return;
> +        surface = qemu_console_surface(con);
> +        dw = surface_width(surface);
> +        dh = surface_height(surface);
> +
> +        dx = dx * (dw - 1) / 0x7fff;
> +        dy = dy * (dh - 1) / 0x7fff;
> +
> +        xenfb_send_position(in, dx, dy, dz);
> +    } else {
> +        xenfb_send_motion(in, dx, dy, dz);
> +
> +        in->mouse_axes[INPUT_AXIS_X] = 0;
> +        in->mouse_axes[INPUT_AXIS_Y] = 0;
>      }
> -    xenfb->button_state = button_state;
> +
> +    in->mouse_wheel = 0;
>  }
>  
> +static QemuInputHandler xenfb_keyboard = {
> +    .name  = "Xen PVFB Keyboard",
> +    .mask  = INPUT_EVENT_MASK_KEY,
> +    .event = xenfb_key_event,
> +};
> +static QemuInputHandler xenfb_abs_mouse = {
> +    .name  = "Xen PVFB Absolute Mouse",
> +    .mask  = INPUT_EVENT_MASK_BTN | INPUT_EVENT_MASK_ABS,
> +    .event = xenfb_mouse_event,
> +    .sync  = xenfb_mouse_sync
> +};
> +static QemuInputHandler xenfb_rel_mouse = {
> +    .name  = "Xen PVFB Mouse",
> +    .mask  = INPUT_EVENT_MASK_BTN | INPUT_EVENT_MASK_REL,
> +    .event = xenfb_mouse_event,
> +    .sync  = xenfb_mouse_sync,
> +};
> +
>  static int input_init(struct XenDevice *xendev)
>  {
>      xenstore_write_be_int(xendev, "feature-abs-pointer", 1);
> @@ -356,7 +440,6 @@ static int input_initialise(struct XenDevice *xendev)
>      if (rc != 0)
>       return rc;
>  
> -    qemu_add_kbd_event_handler(xenfb_key_event, in);
>      return 0;
>  }
>  
> @@ -369,24 +452,34 @@ static void input_connected(struct XenDevice *xendev)
>          in->abs_pointer_wanted = 0;
>      }
>  
> -    if (in->qmouse) {
> -        qemu_remove_mouse_event_handler(in->qmouse);
> +    if (in->qkbd) {
> +        qemu_input_handler_unregister(in->qkbd);
> +    }
> +    if (in->qmou) {
> +        qemu_input_handler_unregister(in->qmou);
>      }
>      trace_xenfb_input_connected(xendev, in->abs_pointer_wanted);
> -    in->qmouse = qemu_add_mouse_event_handler(xenfb_mouse_event, in,
> -                                           in->abs_pointer_wanted,
> -                                           "Xen PVFB Mouse");
> +
> +    in->qkbd = qemu_input_handler_register((DeviceState *)in, 
> &xenfb_keyboard);
> +    in->qmou = qemu_input_handler_register((DeviceState *)in,
> +        (in->abs_pointer_wanted ? &xenfb_abs_mouse : &xenfb_rel_mouse));
> +
> +    qemu_input_handler_activate(in->qkbd);
> +    qemu_input_handler_activate(in->qmou);
>  }
>  
>  static void input_disconnect(struct XenDevice *xendev)
>  {
>      struct XenInput *in = container_of(xendev, struct XenInput, c.xendev);
>  
> -    if (in->qmouse) {
> -     qemu_remove_mouse_event_handler(in->qmouse);
> -     in->qmouse = NULL;
> +    if (in->qkbd) {
> +        qemu_input_handler_unregister(in->qkbd);
> +        in->qkbd = NULL;
> +    }
> +    if (in->qmou) {
> +        qemu_input_handler_unregister(in->qmou);
> +        in->qmou = NULL;
>      }
> -    qemu_add_kbd_event_handler(NULL, NULL);
>      common_unbind(&in->c);
>  }

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