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#include "config-host.h"
#include "trace.h"
#include "ui/qemu-spice.h"
#include "char/char.h"
#include <spice.h>
#include <spice-experimental.h>
#include "qemu/osdep.h"
#define dprintf(_scd, _level, _fmt, ...) \
do { \
static unsigned __dprintf_counter = 0; \
if (_scd->debug >= _level) { \
fprintf(stderr, "scd: %3d: " _fmt, ++__dprintf_counter, ## __VA_ARGS__);\
} \
} while (0)
#define VMC_MAX_HOST_WRITE 2048
typedef struct SpiceCharDriver {
CharDriverState* chr;
SpiceCharDeviceInstance sin;
char *subtype;
bool active;
uint8_t *buffer;
uint8_t *datapos;
ssize_t bufsize, datalen;
uint32_t debug;
} SpiceCharDriver;
static int vmc_write(SpiceCharDeviceInstance *sin, const uint8_t *buf, int len)
{
SpiceCharDriver *scd = container_of(sin, SpiceCharDriver, sin);
ssize_t out = 0;
ssize_t last_out;
uint8_t* p = (uint8_t*)buf;
while (len > 0) {
last_out = MIN(len, VMC_MAX_HOST_WRITE);
if (qemu_chr_be_can_write(scd->chr) < last_out) {
break;
}
qemu_chr_be_write(scd->chr, p, last_out);
out += last_out;
len -= last_out;
p += last_out;
}
dprintf(scd, 3, "%s: %zu/%zd\n", __func__, out, len + out);
trace_spice_vmc_write(out, len + out);
return out;
}
static int vmc_read(SpiceCharDeviceInstance *sin, uint8_t *buf, int len)
{
SpiceCharDriver *scd = container_of(sin, SpiceCharDriver, sin);
int bytes = MIN(len, scd->datalen);
dprintf(scd, 2, "%s: %p %d/%d/%zd\n", __func__, scd->datapos, len, bytes, scd->datalen);
if (bytes > 0) {
memcpy(buf, scd->datapos, bytes);
scd->datapos += bytes;
scd->datalen -= bytes;
assert(scd->datalen >= 0);
if (scd->datalen == 0) {
scd->datapos = 0;
}
}
trace_spice_vmc_read(bytes, len);
return bytes;
}
static void vmc_state(SpiceCharDeviceInstance *sin, int connected)
{
SpiceCharDriver *scd = container_of(sin, SpiceCharDriver, sin);
#if SPICE_SERVER_VERSION < 0x000901
/*
* spice-server calls the state callback for the agent channel when the
* spice client connects / disconnects. Given that not the client but
* the server is doing the parsing of the messages this is wrong as the
* server is still listening. Worse, this causes the parser in the server
* to go out of sync, so we ignore state calls for subtype vdagent
* spicevmc chardevs. For the full story see:
* http://lists.freedesktop.org/archives/spice-devel/2011-July/004837.html
*/
if (strcmp(sin->subtype, "vdagent") == 0) {
return;
}
#endif
if ((scd->chr->opened && connected) ||
(!scd->chr->opened && !connected)) {
return;
}
qemu_chr_be_event(scd->chr,
connected ? CHR_EVENT_OPENED : CHR_EVENT_CLOSED);
}
static SpiceCharDeviceInterface vmc_interface = {
.base.type = SPICE_INTERFACE_CHAR_DEVICE,
.base.description = "spice virtual channel char device",
.base.major_version = SPICE_INTERFACE_CHAR_DEVICE_MAJOR,
.base.minor_version = SPICE_INTERFACE_CHAR_DEVICE_MINOR,
.state = vmc_state,
.write = vmc_write,
.read = vmc_read,
};
static void vmc_register_interface(SpiceCharDriver *scd)
{
if (scd->active) {
return;
}
dprintf(scd, 1, "%s\n", __func__);
scd->sin.base.sif = &vmc_interface.base;
qemu_spice_add_interface(&scd->sin.base);
scd->active = true;
trace_spice_vmc_register_interface(scd);
}
static void vmc_unregister_interface(SpiceCharDriver *scd)
{
if (!scd->active) {
return;
}
dprintf(scd, 1, "%s\n", __func__);
spice_server_remove_interface(&scd->sin.base);
scd->active = false;
trace_spice_vmc_unregister_interface(scd);
}
static int spice_chr_write(CharDriverState *chr, const uint8_t *buf, int len)
{
SpiceCharDriver *s = chr->opaque;
dprintf(s, 2, "%s: %d\n", __func__, len);
vmc_register_interface(s);
assert(s->datalen == 0);
if (s->bufsize < len) {
s->bufsize = len;
s->buffer = g_realloc(s->buffer, s->bufsize);
}
memcpy(s->buffer, buf, len);
s->datapos = s->buffer;
s->datalen = len;
spice_server_char_device_wakeup(&s->sin);
return len;
}
static void spice_chr_close(struct CharDriverState *chr)
{
SpiceCharDriver *s = chr->opaque;
printf("%s\n", __func__);
vmc_unregister_interface(s);
g_free(s);
}
static void spice_chr_guest_open(struct CharDriverState *chr)
{
SpiceCharDriver *s = chr->opaque;
vmc_register_interface(s);
}
static void spice_chr_guest_close(struct CharDriverState *chr)
{
SpiceCharDriver *s = chr->opaque;
vmc_unregister_interface(s);
}
static void print_allowed_subtypes(void)
{
const char** psubtype;
int i;
fprintf(stderr, "allowed names: ");
for(i=0, psubtype = spice_server_char_device_recognized_subtypes();
*psubtype != NULL; ++psubtype, ++i) {
if (i == 0) {
fprintf(stderr, "%s", *psubtype);
} else {
fprintf(stderr, ", %s", *psubtype);
}
}
fprintf(stderr, "\n");
}
CharDriverState *qemu_chr_open_spice(QemuOpts *opts)
{
CharDriverState *chr;
SpiceCharDriver *s;
const char* name = qemu_opt_get(opts, "name");
uint32_t debug = qemu_opt_get_number(opts, "debug", 0);
const char** psubtype = spice_server_char_device_recognized_subtypes();
const char *subtype = NULL;
if (name == NULL) {
fprintf(stderr, "spice-qemu-char: missing name parameter\n");
print_allowed_subtypes();
return NULL;
}
for(;*psubtype != NULL; ++psubtype) {
if (strcmp(name, *psubtype) == 0) {
subtype = *psubtype;
break;
}
}
if (subtype == NULL) {
fprintf(stderr, "spice-qemu-char: unsupported name: %s\n", name);
print_allowed_subtypes();
return NULL;
}
chr = g_malloc0(sizeof(CharDriverState));
s = g_malloc0(sizeof(SpiceCharDriver));
s->chr = chr;
s->debug = debug;
s->active = false;
s->sin.subtype = subtype;
chr->opaque = s;
chr->chr_write = spice_chr_write;
chr->chr_close = spice_chr_close;
chr->chr_guest_open = spice_chr_guest_open;
chr->chr_guest_close = spice_chr_guest_close;
#if SPICE_SERVER_VERSION < 0x000901
/* See comment in vmc_state() */
if (strcmp(subtype, "vdagent") == 0) {
qemu_chr_generic_open(chr);
}
#endif
return chr;
}
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