libIVC_t *openIVCLibrary()
{
libIVC_t *retval;
assert( retval = calloc(1, sizeof(struct libIVC_interface)) );
assert( retval->xc = xc_interface_open(NULL, NULL, 0) );
assert( retval->xs = xs_open(0) );
assert( retval->ec = xc_evtchn_open(NULL, 0) );
assert( retval->gt = xc_gnttab_open(NULL, 0) );
#ifdef HAVE_XENSTORE_H
retval->gs = xc_gntshr_open(NULL, 0); /* may not be available on all plats */
#endif
return retval;
}
struct libxenvchan *libxenvchan_server_init(xentoollog_logger *logger, int domain, const char* xs_path, size_t left_min, size_t right_min)
{
struct libxenvchan *ctrl;
int ring_ref;
if (left_min > MAX_RING_SIZE || right_min > MAX_RING_SIZE)
return 0;
ctrl = malloc(sizeof(*ctrl));
if (!ctrl)
return 0;
ctrl->ring = NULL;
ctrl->event = NULL;
ctrl->is_server = 1;
ctrl->server_persist = 0;
ctrl->read.order = min_order(left_min);
ctrl->write.order = min_order(right_min);
// if we can avoid allocating extra pages by using in-page rings, do so
if (left_min <= MAX_SMALL_RING && right_min <= MAX_LARGE_RING) {
ctrl->read.order = SMALL_RING_SHIFT;
ctrl->write.order = LARGE_RING_SHIFT;
} else if (left_min <= MAX_LARGE_RING && right_min <= MAX_SMALL_RING) {
ctrl->read.order = LARGE_RING_SHIFT;
ctrl->write.order = SMALL_RING_SHIFT;
} else if (left_min <= MAX_LARGE_RING) {
ctrl->read.order = LARGE_RING_SHIFT;
} else if (right_min <= MAX_LARGE_RING) {
ctrl->write.order = LARGE_RING_SHIFT;
}
ctrl->gntshr = xc_gntshr_open(logger, 0);
if (!ctrl->gntshr)
goto out;
if (init_evt_srv(ctrl, domain, logger))
goto out;
ring_ref = init_gnt_srv(ctrl, domain);
if (ring_ref < 0)
goto out;
if (init_xs_srv(ctrl, domain, xs_path, ring_ref))
goto out;
return ctrl;
out:
libxenvchan_close(ctrl);
return 0;
}
CAMLprim value stub_xc_gntshr_open(void)
{
CAMLparam0();
CAMLlocal1(result);
#ifdef HAVE_GNTSHR
xc_gntshr *xgh;
xgh = xc_gntshr_open(NULL, 0);
if (NULL == xgh)
failwith_xc(NULL);
result = (value)xgh;
#else
gntshr_missing();
#endif
CAMLreturn(result);
}
CAMLprim value stub_gntshr_open(value unit)
{
CAMLparam1(unit);
CAMLlocal1(result);
#ifdef HAVE_GNTSHR
xc_gntshr *xgh;
xgh = xc_gntshr_open(NULL, 0);
if (NULL == xgh)
caml_failwith("Failed to open interface");
result = (value)xgh;
#else
gntshr_missing();
#endif
CAMLreturn(result);
}
/* Open an interface to gntshr or gnttab each time it is needed. */
int test_open_multiple() {
xc_gntshr *gntshr_if;
xc_gnttab *gnttab_if;
uint32_t refs[PAGE_COUNT];
uint32_t domids[PAGE_COUNT];
void* local_share;
void* remote_share;
int i;
int err;
gntshr_if = xc_gntshr_open(NULL, 0);
if(!gntshr_if) {
printf("Failed to open gntshr interface.\n");
return 1;
}
gnttab_if = xc_gnttab_open(NULL, 0);
if(!gnttab_if) {
printf("Failed to open gnttab interface.\n");
return 1;
}
local_share = xc_gntshr_share_pages(gntshr_if, DOMID, PAGE_COUNT, refs, 0);
if(!local_share) {
printf("Failed to share memory.\n");
return 1;
}
for(i = 0; i < PAGE_COUNT; i++) {
printf("Sharing page with ref %d.\n", refs[i]);
}
for(i = 0; i < PAGE_COUNT; i++) {
domids[i] = DOMID;
}
remote_share = xc_gnttab_map_grant_refs(
gnttab_if,
PAGE_COUNT,
domids,
refs,
PROT_READ);
if(!remote_share) {
printf("Failed to map memory.\n");
return 1;
}
if(xc_gntshr_close(gntshr_if)) {
printf("Failed to close gntshr interface.\n");
return 1;
}
if(xc_gnttab_close(gnttab_if)) {
printf("Failed to close gnttab interface.\n");
return 1;
}
gntshr_if = xc_gntshr_open(NULL, 0);
if(!gntshr_if) {
printf("Failed to open gntshr interface.\n");
return 1;
}
gnttab_if = xc_gnttab_open(NULL, 0);
if(!gnttab_if) {
printf("Failed to open gnttab interface.\n");
return 1;
}
err = xc_gnttab_munmap(gnttab_if, remote_share, 1);
if(err) {
printf("Failed to unmap memory - got error code %d.\n", err);
return 1;
}
err = xc_gntshr_munmap(gntshr_if, local_share, 1);
if(err) {
printf("Failed to unshare memory - got error code %d.\n", err);
return 1;
}
if(xc_gntshr_close(gntshr_if)) {
printf("Failed to close gntshr interface.\n");
return 1;
}
if(xc_gnttab_close(gnttab_if)) {
printf("Failed to close gnttab interface.\n");
return 1;
}
return 0;
}