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/*
Spice Virtual Machine Channel (VMC).
A virtio-serial port used for spice to guest communication, over
which spice client and a daemon in the guest operating system
communicate.
Replaces the old vdi_port PCI device.
*/
#include <stdio.h>
#include <stdbool.h>
#include <spice.h>
#include <spice-experimental.h>
#include "virtio-serial.h"
#include "qemu-spice.h"
#define VMC_GUEST_DEVICE_NAME "com.redhat.spice.0"
#define VMC_DEVICE_NAME "spicevmc"
/* windows guest driver bug workaround */
#define VMC_MAX_HOST_WRITE 2048
#define dprintf(_svc, _level, _fmt, ...) \
do { \
static unsigned __dprintf_counter = 0; \
if (_svc->debug >= _level) { \
fprintf(stderr, "svc: %3d: " _fmt, ++__dprintf_counter, ## __VA_ARGS__);\
} \
} while (0)
typedef struct SpiceVirtualChannel {
VirtIOSerialPort port;
VMChangeStateEntry *vmstate;
SpiceVDIPortInstance sin;
bool active;
uint8_t *buffer;
uint8_t *datapos;
ssize_t bufsize, datalen;
uint32_t debug;
} SpiceVirtualChannel;
static int vmc_write(SpiceVDIPortInstance *sin, const uint8_t *buf, int len)
{
SpiceVirtualChannel *svc = container_of(sin, SpiceVirtualChannel, sin);
ssize_t out = 0;
ssize_t last_out;
uint8_t* p = (uint8_t*)buf;
while (len > 0) {
last_out = virtio_serial_write(&svc->port, p,
MIN(len, VMC_MAX_HOST_WRITE));
if (last_out > 0) {
out += last_out;
len -= last_out;
p += last_out;
} else {
break;
}
}
dprintf(svc, 3, "%s: %lu/%zd\n", __func__, out, len + out);
return out;
}
static int vmc_read(SpiceVDIPortInstance *sin, uint8_t *buf, int len)
{
SpiceVirtualChannel *svc = container_of(sin, SpiceVirtualChannel, sin);
int bytes = MIN(len, svc->datalen);
dprintf(svc, 2, "%s: %p %d/%d/%zd\n", __func__, svc->datapos, len, bytes, svc->datalen);
if (bytes > 0) {
memcpy(buf, svc->datapos, bytes);
svc->datapos += bytes;
svc->datalen -= bytes;
assert(svc->datalen >= 0);
if (svc->datalen == 0) {
svc->datapos = 0;
virtio_serial_throttle_port(&svc->port, false);
// ^^^ !!! may call vmc_have_data, so don't touch svc after it!
}
}
return bytes;
}
static SpiceVDIPortInterface vmc_interface = {
.base.type = SPICE_INTERFACE_VDI_PORT,
.base.description = "spice virtual channel vdi port",
.base.major_version = SPICE_INTERFACE_VDI_PORT_MAJOR,
.base.minor_version = SPICE_INTERFACE_VDI_PORT_MINOR,
.write = vmc_write,
.read = vmc_read,
};
static void vmc_register_interface(SpiceVirtualChannel *svc)
{
if (svc->active) {
return;
}
dprintf(svc, 1, "%s\n", __func__);
svc->sin.base.sif = &vmc_interface.base;
spice_server_add_interface(spice_server, &svc->sin.base);
svc->active = true;
}
static void vmc_unregister_interface(SpiceVirtualChannel *svc)
{
if (!svc->active) {
return;
}
dprintf(svc, 1, "%s\n", __func__);
spice_server_remove_interface(&svc->sin.base);
svc->active = false;
}
static void vmc_change_state_handler(void *opaque, int running, int reason)
{
SpiceVirtualChannel *svc = opaque;
if (running && svc->active) {
spice_server_vdi_port_wakeup(&svc->sin);
}
}
/*
* virtio-serial callbacks
*/
static void vmc_guest_open(VirtIOSerialPort *port)
{
SpiceVirtualChannel *svc = DO_UPCAST(SpiceVirtualChannel, port, port);
dprintf(svc, 1, "%s\n", __func__);
vmc_register_interface(svc);
}
static void vmc_guest_close(VirtIOSerialPort *port)
{
SpiceVirtualChannel *svc = DO_UPCAST(SpiceVirtualChannel, port, port);
dprintf(svc, 1, "%s\n", __func__);
vmc_unregister_interface(svc);
}
static void vmc_guest_ready(VirtIOSerialPort *port)
{
SpiceVirtualChannel *svc = DO_UPCAST(SpiceVirtualChannel, port, port);
dprintf(svc, 1, "%s\n", __func__);
if (svc->active)
spice_server_vdi_port_wakeup(&svc->sin);
}
static void vmc_have_data(VirtIOSerialPort *port, const uint8_t *buf, size_t len)
{
SpiceVirtualChannel *svc = DO_UPCAST(SpiceVirtualChannel, port, port);
dprintf(svc, 2, "%s: %zd\n", __func__, len);
assert(svc->datalen == 0);
if (svc->bufsize < len) {
svc->bufsize = len;
svc->buffer = qemu_realloc(svc->buffer, svc->bufsize);
}
memcpy(svc->buffer, buf, len);
svc->datapos = svc->buffer;
svc->datalen = len;
virtio_serial_throttle_port(&svc->port, true);
spice_server_vdi_port_wakeup(&svc->sin);
}
static int vmc_initfn(VirtIOSerialDevice *dev)
{
VirtIOSerialPort *port = DO_UPCAST(VirtIOSerialPort, dev, &dev->qdev);
SpiceVirtualChannel *svc = DO_UPCAST(SpiceVirtualChannel, port, port);
if (!using_spice)
return -1;
dprintf(svc, 1, "%s\n", __func__);
port->name = qemu_strdup(VMC_GUEST_DEVICE_NAME);
svc->vmstate = qemu_add_vm_change_state_handler(
vmc_change_state_handler, svc);
virtio_serial_open(port);
return 0;
}
static int vmc_exitfn(VirtIOSerialDevice *dev)
{
VirtIOSerialPort *port = DO_UPCAST(VirtIOSerialPort, dev, &dev->qdev);
SpiceVirtualChannel *svc = DO_UPCAST(SpiceVirtualChannel, port, port);
dprintf(svc, 1, "%s\n", __func__);
vmc_unregister_interface(svc);
qemu_del_vm_change_state_handler(svc->vmstate);
virtio_serial_close(port);
return 0;
}
static VirtIOSerialPortInfo vmc_info = {
.qdev.name = VMC_DEVICE_NAME,
.qdev.size = sizeof(SpiceVirtualChannel),
.init = vmc_initfn,
.exit = vmc_exitfn,
.guest_open = vmc_guest_open,
.guest_close = vmc_guest_close,
.guest_ready = vmc_guest_ready,
.have_data = vmc_have_data,
.qdev.props = (Property[]) {
DEFINE_PROP_UINT32("nr", SpiceVirtualChannel, port.id, VIRTIO_CONSOLE_BAD_ID),
DEFINE_PROP_UINT32("debug", SpiceVirtualChannel, debug, 1),
DEFINE_PROP_END_OF_LIST(),
}
};
static void vmc_register(void)
{
virtio_serial_port_qdev_register(&vmc_info);
}
device_init(vmc_register)
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