Commit 006a5ede authored by Gerd Hoffmann's avatar Gerd Hoffmann
Browse files

virtio-input: evdev passthrough 



This allows to assign host input devices to the guest:

qemu -device virtio-input-host-pci,evdev=/dev/input/event<nr>

The guest gets exclusive access to the input device, so be careful
with assigning the keyboard if you have only one connected to your
machine.

Signed-off-by: default avatarGerd Hoffmann <kraxel@redhat.com>
parent 6f2b9a5b

hw/input/Makefile.objs

+1 −0
Original line number Diff line number Diff line
@@ -11,6 +11,7 @@ common-obj-$(CONFIG_VMMOUSE) += vmmouse.o 
ifeq ($(CONFIG_LINUX),y)

common-obj-$(CONFIG_VIRTIO) += virtio-input.o

common-obj-$(CONFIG_VIRTIO) += virtio-input-hid.o

common-obj-$(CONFIG_VIRTIO) += virtio-input-host.o

endif



obj-$(CONFIG_MILKYMIST) += milkymist-softusb.o

hw/input/virtio-input-host.c

0 → 100644
+188 −0
Original line number Diff line number Diff line 
/*

 * This work is licensed under the terms of the GNU GPL, version 2 or

 * (at your option) any later version.  See the COPYING file in the

 * top-level directory.

 */



#include "qemu-common.h"

#include "qemu/sockets.h"



#include "hw/qdev.h"

#include "hw/virtio/virtio.h"

#include "hw/virtio/virtio-input.h"



#include "standard-headers/linux/input.h"



/* ----------------------------------------------------------------- */



static struct virtio_input_config virtio_input_host_config[] = {

    { /* empty list */ },

};



static void virtio_input_host_event(void *opaque)

{

    VirtIOInputHost *vih = opaque;

    VirtIOInput *vinput = VIRTIO_INPUT(vih);

    struct virtio_input_event virtio;

    struct input_event evdev;

    int rc;



    for (;;) {

        rc = read(vih->fd, &evdev, sizeof(evdev));

        if (rc != sizeof(evdev)) {

            break;

        }



        virtio.type  = cpu_to_le16(evdev.type);

        virtio.code  = cpu_to_le16(evdev.code);

        virtio.value = cpu_to_le32(evdev.value);

        virtio_input_send(vinput, &virtio);

    }

}



static void virtio_input_bits_config(VirtIOInputHost *vih,

                                     int type, int count)

{

    virtio_input_config bits;

    int rc, i, size = 0;



    memset(&bits, 0, sizeof(bits));

    rc = ioctl(vih->fd, EVIOCGBIT(type, count/8), bits.u.bitmap);

    if (rc < 0) {

        return;

    }



    for (i = 0; i < count/8; i++) {

        if (bits.u.bitmap[i]) {

            size = i+1;

        }

    }

    if (size == 0) {

        return;

    }



    bits.select = VIRTIO_INPUT_CFG_EV_BITS;

    bits.subsel = type;

    bits.size   = size;

    virtio_input_add_config(VIRTIO_INPUT(vih), &bits);

}



static void virtio_input_host_realize(DeviceState *dev, Error **errp)

{

    VirtIOInputHost *vih = VIRTIO_INPUT_HOST(dev);

    VirtIOInput *vinput = VIRTIO_INPUT(dev);

    virtio_input_config id;

    struct input_id ids;

    int rc, ver;



    if (!vih->evdev) {

        error_setg(errp, "evdev property is required");

        return;

    }



    vih->fd = open(vih->evdev, O_RDWR);

    if (vih->fd < 0)  {

        error_setg_file_open(errp, errno, vih->evdev);

        return;

    }

    qemu_set_nonblock(vih->fd);



    rc = ioctl(vih->fd, EVIOCGVERSION, &ver);

    if (rc < 0) {

        error_setg(errp, "%s: is not an evdev device", vih->evdev);

        goto err_close;

    }



    rc = ioctl(vih->fd, EVIOCGRAB, 1);

    if (rc < 0) {

        error_setg_errno(errp, errno, "%s: failed to get exclusive access",

                         vih->evdev);

        goto err_close;

    }



    memset(&id, 0, sizeof(id));

    ioctl(vih->fd, EVIOCGNAME(sizeof(id.u.string)-1), id.u.string);

    id.select = VIRTIO_INPUT_CFG_ID_NAME;

    id.size = strlen(id.u.string);

    virtio_input_add_config(vinput, &id);



    if (ioctl(vih->fd, EVIOCGID, &ids) == 0) {

        memset(&id, 0, sizeof(id));

        id.select = VIRTIO_INPUT_CFG_ID_DEVIDS;

        id.size = sizeof(struct virtio_input_devids);

        id.u.ids.bustype = cpu_to_le16(ids.bustype);

        id.u.ids.vendor  = cpu_to_le16(ids.vendor);

        id.u.ids.product = cpu_to_le16(ids.product);

        id.u.ids.version = cpu_to_le16(ids.version);

        virtio_input_add_config(vinput, &id);

    }



    virtio_input_bits_config(vih, EV_KEY, KEY_CNT);

    virtio_input_bits_config(vih, EV_REL, REL_CNT);

    virtio_input_bits_config(vih, EV_ABS, ABS_CNT);

    virtio_input_bits_config(vih, EV_MSC, MSC_CNT);

    virtio_input_bits_config(vih, EV_SW,  SW_CNT);



    qemu_set_fd_handler(vih->fd, virtio_input_host_event, NULL, vih);

    return;



err_close:

    close(vih->fd);

    vih->fd = -1;

    return;

}



static void virtio_input_host_unrealize(DeviceState *dev, Error **errp)

{

    VirtIOInputHost *vih = VIRTIO_INPUT_HOST(dev);



    if (vih->fd > 0) {

        qemu_set_fd_handler(vih->fd, NULL, NULL, NULL);

        close(vih->fd);

    }

}



static const VMStateDescription vmstate_virtio_input_host = {

    .name = "virtio-input-host",

    .unmigratable = 1,

};



static Property virtio_input_host_properties[] = {

    DEFINE_PROP_STRING("evdev", VirtIOInputHost, evdev),

    DEFINE_PROP_END_OF_LIST(),

};



static void virtio_input_host_class_init(ObjectClass *klass, void *data)

{

    VirtIOInputClass *vic = VIRTIO_INPUT_CLASS(klass);

    DeviceClass *dc = DEVICE_CLASS(klass);



    dc->vmsd           = &vmstate_virtio_input_host;

    dc->props          = virtio_input_host_properties;

    vic->realize       = virtio_input_host_realize;

    vic->unrealize     = virtio_input_host_unrealize;

}



static void virtio_input_host_init(Object *obj)

{

    VirtIOInput *vinput = VIRTIO_INPUT(obj);



    virtio_input_init_config(vinput, virtio_input_host_config);

}



static const TypeInfo virtio_input_host_info = {

    .name          = TYPE_VIRTIO_INPUT_HOST,

    .parent        = TYPE_VIRTIO_INPUT,

    .instance_size = sizeof(VirtIOInputHost),

    .instance_init = virtio_input_host_init,

    .class_init    = virtio_input_host_class_init,

};



/* ----------------------------------------------------------------- */



static void virtio_register_types(void)

{

    type_register_static(&virtio_input_host_info);

}



type_init(virtio_register_types)

hw/virtio/virtio-pci.c

+16 −0
Original line number Diff line number Diff line
@@ -1969,6 +1969,14 @@ static void virtio_tablet_initfn(Object *obj) 
                                TYPE_VIRTIO_TABLET);

}



static void virtio_host_initfn(Object *obj)

{

    VirtIOInputHostPCI *dev = VIRTIO_INPUT_HOST_PCI(obj);



    virtio_instance_init_common(obj, &dev->vdev, sizeof(dev->vdev),

                                TYPE_VIRTIO_INPUT_HOST);

}



static const TypeInfo virtio_input_pci_info = {

    .name          = TYPE_VIRTIO_INPUT_PCI,

    .parent        = TYPE_VIRTIO_PCI,
@@ -2007,6 +2015,13 @@ static const TypeInfo virtio_tablet_pci_info = { 
    .instance_init = virtio_tablet_initfn,

};



static const TypeInfo virtio_host_pci_info = {

    .name          = TYPE_VIRTIO_INPUT_HOST_PCI,

    .parent        = TYPE_VIRTIO_INPUT_PCI,

    .instance_size = sizeof(VirtIOInputHostPCI),

    .instance_init = virtio_host_initfn,

};



/* virtio-pci-bus */



static void virtio_pci_bus_new(VirtioBusState *bus, size_t bus_size,
@@ -2053,6 +2068,7 @@ static void virtio_pci_register_types(void) 
    type_register_static(&virtio_keyboard_pci_info);

    type_register_static(&virtio_mouse_pci_info);

    type_register_static(&virtio_tablet_pci_info);

    type_register_static(&virtio_host_pci_info);

    type_register_static(&virtio_pci_bus_info);

    type_register_static(&virtio_pci_info);

#ifdef CONFIG_VIRTFS

hw/virtio/virtio-pci.h

+10 −0
Original line number Diff line number Diff line
@@ -43,6 +43,7 @@ typedef struct VHostSCSIPCI VHostSCSIPCI; 
typedef struct VirtIORngPCI VirtIORngPCI;

typedef struct VirtIOInputPCI VirtIOInputPCI;

typedef struct VirtIOInputHIDPCI VirtIOInputHIDPCI;

typedef struct VirtIOInputHostPCI VirtIOInputHostPCI;

typedef struct VirtIOGPUPCI VirtIOGPUPCI;



/* virtio-pci-bus */
@@ -263,6 +264,15 @@ struct VirtIOInputHIDPCI { 
    VirtIOInputHID vdev;

};



#define TYPE_VIRTIO_INPUT_HOST_PCI "virtio-input-host-pci"

#define VIRTIO_INPUT_HOST_PCI(obj) \

        OBJECT_CHECK(VirtIOInputHostPCI, (obj), TYPE_VIRTIO_INPUT_HOST_PCI)



struct VirtIOInputHostPCI {

    VirtIOPCIProxy parent_obj;

    VirtIOInputHost vdev;

};



/*

 * virtio-gpu-pci: This extends VirtioPCIProxy.

 */

include/hw/virtio/virtio-input.h

+13 −0
Original line number Diff line number Diff line
@@ -50,10 +50,17 @@ typedef struct virtio_input_event virtio_input_event; 
#define VIRTIO_INPUT_HID_GET_PARENT_CLASS(obj) \

        OBJECT_GET_PARENT_CLASS(obj, TYPE_VIRTIO_INPUT_HID)



#define TYPE_VIRTIO_INPUT_HOST   "virtio-input-host-device"

#define VIRTIO_INPUT_HOST(obj) \

        OBJECT_CHECK(VirtIOInputHost, (obj), TYPE_VIRTIO_INPUT_HOST)

#define VIRTIO_INPUT_HOST_GET_PARENT_CLASS(obj) \

        OBJECT_GET_PARENT_CLASS(obj, TYPE_VIRTIO_INPUT_HOST)



typedef struct VirtIOInput VirtIOInput;

typedef struct VirtIOInputClass VirtIOInputClass;

typedef struct VirtIOInputConfig VirtIOInputConfig;

typedef struct VirtIOInputHID VirtIOInputHID;

typedef struct VirtIOInputHost VirtIOInputHost;



struct VirtIOInputConfig {

    virtio_input_config               config;
@@ -93,6 +100,12 @@ struct VirtIOInputHID { 
    int                               ledstate;

};



struct VirtIOInputHost {

    VirtIOInput                       parent_obj;

    char                              *evdev;

    int                               fd;

};



void virtio_input_send(VirtIOInput *vinput, virtio_input_event *event);

void virtio_input_init_config(VirtIOInput *vinput,

                              virtio_input_config *config);