/* Stolen from xenstore code */
static int eventchn_init(void)
{
int rc;
// to revert to old way:
if (0)
return -1;
xce_handle = xenevtchn_open(NULL, 0);
if (xce_handle == NULL)
perror("Failed to open evtchn device");
if ((rc = xenevtchn_bind_virq(xce_handle, VIRQ_TBUF)) == -1)
perror("Failed to bind to domain exception virq port");
virq_port = rc;
return xce_handle == NULL ? -1 : 0;
}
int main(int argc, char *argv[])
{
int rc;
atexit(cleanup);
xch = xc_interface_open(NULL, NULL, 0);
if (xch == NULL)
{
perror("Failed to open xc interface");
return 1;
}
xce_handle = xenevtchn_open(NULL, 0);
if (xce_handle == NULL)
{
perror("Failed to open evtchn device");
return 2;
}
xs_handle = xs_daemon_open();
if (xs_handle == NULL)
{
perror("Failed to open xenstore connection");
return 3;
}
if ((rc = xenevtchn_bind_virq(xce_handle, VIRQ_ENOMEM)) == -1)
{
perror("Failed to bind to domain exception virq port");
return 4;
}
virq_port = rc;
while(1)
{
evtchn_port_t port;
if ((port = xenevtchn_pending(xce_handle)) == -1)
{
perror("Failed to listen for pending event channel");
return 5;
}
if (port != virq_port)
{
char data[BUFSZ];
snprintf(data, BUFSZ, "Wrong port, got %d expected %d", port, virq_port);
perror(data);
return 6;
}
if (xenevtchn_unmask(xce_handle, port) == -1)
{
perror("Failed to unmask port");
return 7;
}
printf("Got a virq kick, time to get work\n");
handle_low_mem();
}
return 0;
}
static int xen_9pfs_connect(struct XenLegacyDevice *xendev)
{
Error *err = NULL;
int i;
Xen9pfsDev *xen_9pdev = container_of(xendev, Xen9pfsDev, xendev);
V9fsState *s = &xen_9pdev->state;
QemuOpts *fsdev;
if (xenstore_read_fe_int(&xen_9pdev->xendev, "num-rings",
&xen_9pdev->num_rings) == -1 ||
xen_9pdev->num_rings > MAX_RINGS || xen_9pdev->num_rings < 1) {
return -1;
}
xen_9pdev->rings = g_new0(Xen9pfsRing, xen_9pdev->num_rings);
for (i = 0; i < xen_9pdev->num_rings; i++) {
char *str;
int ring_order;
xen_9pdev->rings[i].priv = xen_9pdev;
xen_9pdev->rings[i].evtchn = -1;
xen_9pdev->rings[i].local_port = -1;
str = g_strdup_printf("ring-ref%u", i);
if (xenstore_read_fe_int(&xen_9pdev->xendev, str,
&xen_9pdev->rings[i].ref) == -1) {
g_free(str);
goto out;
}
g_free(str);
str = g_strdup_printf("event-channel-%u", i);
if (xenstore_read_fe_int(&xen_9pdev->xendev, str,
&xen_9pdev->rings[i].evtchn) == -1) {
g_free(str);
goto out;
}
g_free(str);
xen_9pdev->rings[i].intf =
xen_be_map_grant_ref(&xen_9pdev->xendev,
xen_9pdev->rings[i].ref,
PROT_READ | PROT_WRITE);
if (!xen_9pdev->rings[i].intf) {
goto out;
}
ring_order = xen_9pdev->rings[i].intf->ring_order;
if (ring_order > MAX_RING_ORDER) {
goto out;
}
xen_9pdev->rings[i].ring_order = ring_order;
xen_9pdev->rings[i].data =
xen_be_map_grant_refs(&xen_9pdev->xendev,
xen_9pdev->rings[i].intf->ref,
(1 << ring_order),
PROT_READ | PROT_WRITE);
if (!xen_9pdev->rings[i].data) {
goto out;
}
xen_9pdev->rings[i].ring.in = xen_9pdev->rings[i].data;
xen_9pdev->rings[i].ring.out = xen_9pdev->rings[i].data +
XEN_FLEX_RING_SIZE(ring_order);
xen_9pdev->rings[i].bh = qemu_bh_new(xen_9pfs_bh, &xen_9pdev->rings[i]);
xen_9pdev->rings[i].out_cons = 0;
xen_9pdev->rings[i].out_size = 0;
xen_9pdev->rings[i].inprogress = false;
xen_9pdev->rings[i].evtchndev = xenevtchn_open(NULL, 0);
if (xen_9pdev->rings[i].evtchndev == NULL) {
goto out;
}
qemu_set_cloexec(xenevtchn_fd(xen_9pdev->rings[i].evtchndev));
xen_9pdev->rings[i].local_port = xenevtchn_bind_interdomain
(xen_9pdev->rings[i].evtchndev,
xendev->dom,
xen_9pdev->rings[i].evtchn);
if (xen_9pdev->rings[i].local_port == -1) {
xen_pv_printf(xendev, 0,
"xenevtchn_bind_interdomain failed port=%d\n",
xen_9pdev->rings[i].evtchn);
goto out;
}
xen_pv_printf(xendev, 2, "bind evtchn port %d\n", xendev->local_port);
qemu_set_fd_handler(xenevtchn_fd(xen_9pdev->rings[i].evtchndev),
xen_9pfs_evtchn_event, NULL, &xen_9pdev->rings[i]);
}
xen_9pdev->security_model = xenstore_read_be_str(xendev, "security_model");
xen_9pdev->path = xenstore_read_be_str(xendev, "path");
xen_9pdev->id = s->fsconf.fsdev_id =
g_strdup_printf("xen9p%d", xendev->dev);
xen_9pdev->tag = s->fsconf.tag = xenstore_read_fe_str(xendev, "tag");
fsdev = qemu_opts_create(qemu_find_opts("fsdev"),
s->fsconf.tag,
1, NULL);
qemu_opt_set(fsdev, "fsdriver", "local", NULL);
qemu_opt_set(fsdev, "path", xen_9pdev->path, NULL);
qemu_opt_set(fsdev, "security_model", xen_9pdev->security_model, NULL);
qemu_opts_set_id(fsdev, s->fsconf.fsdev_id);
qemu_fsdev_add(fsdev, &err);
if (err) {
error_report_err(err);
}
v9fs_device_realize_common(s, &xen_9p_transport, NULL);
return 0;
out:
xen_9pfs_free(xendev);
return -1;
}
