Archipelago » qemu

#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_can_read(scd->chr) < last_out) {

            break;

        }

        qemu_chr_read(scd->chr, p, last_out);

        out += last_out;

        len -= last_out;

        p += last_out;

    }

    dprintf(scd, 3, "%s: %lu/%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 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,

    .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 = qemu_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);

    qemu_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 = qemu_mallocz(sizeof(CharDriverState));

    s = qemu_mallocz(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;

    qemu_chr_generic_open(chr);

    *_chr = chr;

    return 0;

}