diff options
Diffstat (limited to 'spice-qemu-char.c')
-rw-r--r-- | spice-qemu-char.c | 238 |
1 files changed, 238 insertions, 0 deletions
diff --git a/spice-qemu-char.c b/spice-qemu-char.c new file mode 100644 index 000000000..7e8eaa9fd --- /dev/null +++ b/spice-qemu-char.c @@ -0,0 +1,238 @@ +#include "config-host.h" +#include "trace.h" +#include "ui/qemu-spice.h" +#include <spice.h> +#include <spice-experimental.h> + +#include "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"); +} + +int qemu_chr_open_spice(QemuOpts *opts, CharDriverState **_chr) +{ + 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 -EINVAL; + } + for(;*psubtype != NULL; ++psubtype) { + if (strcmp(name, *psubtype) == 0) { + subtype = *psubtype; + break; + } + } + if (subtype == NULL) { + fprintf(stderr, "spice-qemu-char: unsupported name\n"); + print_allowed_subtypes(); + return -EINVAL; + } + + 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 + + *_chr = chr; + return 0; +} |