spice-qemu-char.c

   1 #include "config-host.h"
   2 #include "trace.h"
   3 #include "ui/qemu-spice.h"
   4 #include <spice.h>
   5 #include <spice-experimental.h>
   6
   7 #include "osdep.h"
   8
   9 #define dprintf(_scd, _level, _fmt, ...)                                \
  10     do {                                                                \
  11         static unsigned __dprintf_counter = 0;                          \
  12         if (_scd->debug >= _level) {                                    \
  13             fprintf(stderr, "scd: %3d: " _fmt, ++__dprintf_counter, ## __VA_ARGS__);\
  14         }                                                               \
  15     } while (0)
  16
  17 #define VMC_MAX_HOST_WRITE    2048
  18
  19 typedef struct SpiceCharDriver {
  20     CharDriverState*      chr;
  21     SpiceCharDeviceInstance     sin;
  22     char                  *subtype;
  23     bool                  active;
  24     uint8_t               *buffer;
  25     uint8_t               *datapos;
  26     ssize_t               bufsize, datalen;
  27     uint32_t              debug;
  28 } SpiceCharDriver;
  29
  30 static int vmc_write(SpiceCharDeviceInstance *sin, const uint8_t *buf, int len)
  31 {
  32     SpiceCharDriver *scd = container_of(sin, SpiceCharDriver, sin);
  33     ssize_t out = 0;
  34     ssize_t last_out;
  35     uint8_t* p = (uint8_t*)buf;
  36
  37     while (len > 0) {
  38         last_out = MIN(len, VMC_MAX_HOST_WRITE);
  39         if (qemu_chr_can_read(scd->chr) < last_out) {
  40             break;
  41         }
  42         qemu_chr_read(scd->chr, p, last_out);
  43         out += last_out;
  44         len -= last_out;
  45         p += last_out;
  46     }
  47
  48     dprintf(scd, 3, "%s: %lu/%zd\n", __func__, out, len + out);
  49     trace_spice_vmc_write(out, len + out);
  50     return out;
  51 }
  52
  53 static int vmc_read(SpiceCharDeviceInstance *sin, uint8_t *buf, int len)
  54 {
  55     SpiceCharDriver *scd = container_of(sin, SpiceCharDriver, sin);
  56     int bytes = MIN(len, scd->datalen);
  57
  58     dprintf(scd, 2, "%s: %p %d/%d/%zd\n", __func__, scd->datapos, len, bytes, scd->datalen);
  59     if (bytes > 0) {
  60         memcpy(buf, scd->datapos, bytes);
  61         scd->datapos += bytes;
  62         scd->datalen -= bytes;
  63         assert(scd->datalen >= 0);
  64         if (scd->datalen == 0) {
  65             scd->datapos = 0;
  66         }
  67     }
  68     trace_spice_vmc_read(bytes, len);
  69     return bytes;
  70 }
  71
  72 static SpiceCharDeviceInterface vmc_interface = {
  73     .base.type          = SPICE_INTERFACE_CHAR_DEVICE,
  74     .base.description   = "spice virtual channel char device",
  75     .base.major_version = SPICE_INTERFACE_CHAR_DEVICE_MAJOR,
  76     .base.minor_version = SPICE_INTERFACE_CHAR_DEVICE_MINOR,
  77     .write              = vmc_write,
  78     .read               = vmc_read,
  79 };
  80
  81
  82 static void vmc_register_interface(SpiceCharDriver *scd)
  83 {
  84     if (scd->active) {
  85         return;
  86     }
  87     dprintf(scd, 1, "%s\n", __func__);
  88     scd->sin.base.sif = &vmc_interface.base;
  89     qemu_spice_add_interface(&scd->sin.base);
  90     scd->active = true;
  91     trace_spice_vmc_register_interface(scd);
  92 }
  93
  94 static void vmc_unregister_interface(SpiceCharDriver *scd)
  95 {
  96     if (!scd->active) {
  97         return;
  98     }
  99     dprintf(scd, 1, "%s\n", __func__);
 100     spice_server_remove_interface(&scd->sin.base);
 101     scd->active = false;
 102     trace_spice_vmc_unregister_interface(scd);
 103 }
 104
 105
 106 static int spice_chr_write(CharDriverState *chr, const uint8_t *buf, int len)
 107 {
 108     SpiceCharDriver *s = chr->opaque;
 109
 110     dprintf(s, 2, "%s: %d\n", __func__, len);
 111     vmc_register_interface(s);
 112     assert(s->datalen == 0);
 113     if (s->bufsize < len) {
 114         s->bufsize = len;
 115         s->buffer = qemu_realloc(s->buffer, s->bufsize);
 116     }
 117     memcpy(s->buffer, buf, len);
 118     s->datapos = s->buffer;
 119     s->datalen = len;
 120     spice_server_char_device_wakeup(&s->sin);
 121     return len;
 122 }
 123
 124 static void spice_chr_close(struct CharDriverState *chr)
 125 {
 126     SpiceCharDriver *s = chr->opaque;
 127
 128     printf("%s\n", __func__);
 129     vmc_unregister_interface(s);
 130     qemu_free(s);
 131 }
 132
 133 static void spice_chr_guest_open(struct CharDriverState *chr)
 134 {
 135     SpiceCharDriver *s = chr->opaque;
 136     vmc_register_interface(s);
 137 }
 138
 139 static void spice_chr_guest_close(struct CharDriverState *chr)
 140 {
 141     SpiceCharDriver *s = chr->opaque;
 142     vmc_unregister_interface(s);
 143 }
 144
 145 static void print_allowed_subtypes(void)
 146 {
 147     const char** psubtype;
 148     int i;
 149
 150     fprintf(stderr, "allowed names: ");
 151     for(i=0, psubtype = spice_server_char_device_recognized_subtypes();
 152         *psubtype != NULL; ++psubtype, ++i) {
 153         if (i == 0) {
 154             fprintf(stderr, "%s", *psubtype);
 155         } else {
 156             fprintf(stderr, ", %s", *psubtype);
 157         }
 158     }
 159     fprintf(stderr, "\n");
 160 }
 161
 162 int qemu_chr_open_spice(QemuOpts *opts, CharDriverState **_chr)
 163 {
 164     CharDriverState *chr;
 165     SpiceCharDriver *s;
 166     const char* name = qemu_opt_get(opts, "name");
 167     uint32_t debug = qemu_opt_get_number(opts, "debug", 0);
 168     const char** psubtype = spice_server_char_device_recognized_subtypes();
 169     const char *subtype = NULL;
 170
 171     if (name == NULL) {
 172         fprintf(stderr, "spice-qemu-char: missing name parameter\n");
 173         print_allowed_subtypes();
 174         return -EINVAL;
 175     }
 176     for(;*psubtype != NULL; ++psubtype) {
 177         if (strcmp(name, *psubtype) == 0) {
 178             subtype = *psubtype;
 179             break;
 180         }
 181     }
 182     if (subtype == NULL) {
 183         fprintf(stderr, "spice-qemu-char: unsupported name\n");
 184         print_allowed_subtypes();
 185         return -EINVAL;
 186     }
 187
 188     chr = qemu_mallocz(sizeof(CharDriverState));
 189     s = qemu_mallocz(sizeof(SpiceCharDriver));
 190     s->chr = chr;
 191     s->debug = debug;
 192     s->active = false;
 193     s->sin.subtype = subtype;
 194     chr->opaque = s;
 195     chr->chr_write = spice_chr_write;
 196     chr->chr_close = spice_chr_close;
 197     chr->chr_guest_open = spice_chr_guest_open;
 198     chr->chr_guest_close = spice_chr_guest_close;
 199
 200     qemu_chr_generic_open(chr);
 201
 202     *_chr = chr;
 203     return 0;
 204 }