static void handle_aio_events(struct fs_mount *mount)
{
int fd, ret, count, i, notify;
evtchn_port_t port;
/* AIO control block for the evtchn file destriptor */
struct aiocb evtchn_cb;
const struct aiocb * cb_list[mount->nr_entries];
int request_ids[mount->nr_entries];
/* Prepare the AIO control block for evtchn */
fd = xc_evtchn_fd(mount->evth);
bzero(&evtchn_cb, sizeof(struct aiocb));
evtchn_cb.aio_fildes = fd;
evtchn_cb.aio_nbytes = sizeof(port);
evtchn_cb.aio_buf = &port;
assert(aio_read(&evtchn_cb) == 0);
wait_again:
/* Create list of active AIO requests */
count = 0;
for(i=0; i<mount->nr_entries; i++)
if(mount->requests[i].active)
{
cb_list[count] = &mount->requests[i].aiocb;
request_ids[count] = i;
count++;
}
/* Add the event channel at the end of the list. Event channel needs to be
* handled last as it exits this function. */
cb_list[count] = &evtchn_cb;
request_ids[count] = -1;
count++;
/* Block till an AIO requset finishes, or we get an event */
while(1) {
int ret = aio_suspend(cb_list, count, NULL);
if (!ret)
break;
assert(errno == EINTR);
}
for(i=0; i<count; i++)
if(aio_error(cb_list[i]) != EINPROGRESS)
{
if(request_ids[i] >= 0)
dispatch_response(mount, request_ids[i]);
else
goto read_event_channel;
}
RING_PUSH_RESPONSES_AND_CHECK_NOTIFY(&mount->ring, notify);
printf("Pushed responces and notify=%d\n", notify);
if(notify)
xc_evtchn_notify(mount->evth, mount->local_evtchn);
goto wait_again;
read_event_channel:
assert(aio_return(&evtchn_cb) == sizeof(evtchn_port_t));
assert(xc_evtchn_unmask(mount->evth, mount->local_evtchn) >= 0);
}
static void wait_for_event(void)
{
int ret;
fd_set inset;
evtchn_port_t port;
struct timeval tv;
int evtchn_fd;
if (xce_handle < 0) {
nanosleep(&opts.poll_sleep, NULL);
return;
}
evtchn_fd = xc_evtchn_fd(xce_handle);
FD_ZERO(&inset);
FD_SET(evtchn_fd, &inset);
tv.tv_sec = 1;
tv.tv_usec = 0;
// tv = millis_to_timespec(&opts.poll_sleep);
ret = select(evtchn_fd+1, &inset, NULL, NULL, &tv);
if ( (ret == 1) && FD_ISSET(evtchn_fd, &inset)) {
if ((port = xc_evtchn_pending(xce_handle)) == -1)
perror("Failed to read from event fd");
// if (port == virq_port)
// printf("got the event I was looking for\r\n");
if (xc_evtchn_unmask(xce_handle, port) == -1)
perror("Failed to write to event fd");
}
}
/* Register a QEMU graphical console, and key/mouse handler,
* connecting up their events to the frontend */
static int xenfb_register_console(struct xenfb *xenfb) {
/* Register our keyboard & mouse handlers */
qemu_add_kbd_event_handler(xenfb_key_event, xenfb);
qemu_add_mouse_event_handler(xenfb_mouse_event, xenfb,
xenfb->abs_pointer_wanted,
"Xen PVFB Mouse");
/* Tell QEMU to allocate a graphical console */
graphic_console_init(xenfb->ds,
xenfb_update,
xenfb_invalidate,
xenfb_screen_dump,
xenfb);
if (xenfb->ds->dpy_resize_shared)
dpy_resize_shared(xenfb->ds, xenfb->width, xenfb->height, xenfb->depth, xenfb->row_stride, xenfb->pixels + xenfb->offset);
else
dpy_resize(xenfb->ds, xenfb->width, xenfb->height);
if (qemu_set_fd_handler2(xc_evtchn_fd(xenfb->evt_xch), NULL, xenfb_dispatch_channel, NULL, xenfb) < 0)
return -1;
if (qemu_set_fd_handler2(xs_fileno(xenfb->xsh), NULL, xenfb_dispatch_store, NULL, xenfb) < 0)
return -1;
fprintf(stderr, "Xen Framebuffer registered\n");
return 0;
}
static int evtchn_suspend(checkpoint_state* s)
{
int rc;
rc = xc_evtchn_notify(s->xce, s->suspend_evtchn);
if (rc < 0) {
snprintf(errbuf, sizeof(errbuf),
"failed to notify suspend event channel: %d", rc);
s->errstr = errbuf;
return -1;
}
do
if (!(rc = pollfd(s, xc_evtchn_fd(s->xce))))
rc = xc_evtchn_pending(s->xce);
while (rc >= 0 && rc != s->suspend_evtchn);
if (rc <= 0)
return -1;
if (xc_evtchn_unmask(s->xce, s->suspend_evtchn) < 0) {
snprintf(errbuf, sizeof(errbuf),
"failed to unmask suspend notification channel: %d", rc);
s->errstr = errbuf;
return -1;
}
return 0;
}
CAMLprim value stub_eventchn_fd(value xce)
{
int fd;
fd = xc_evtchn_fd(_H(xce));
if (fd == -1)
caml_failwith("evtchn fd failed");
return Val_int(fd);
}
void xen_be_unbind_evtchn(struct XenDevice *xendev)
{
if (xendev->local_port == -1) {
return;
}
qemu_set_fd_handler(xc_evtchn_fd(xendev->evtchndev), NULL, NULL, NULL);
xc_evtchn_unbind(xendev->evtchndev, xendev->local_port);
xen_be_printf(xendev, 2, "unbind evtchn port %d\n", xendev->local_port);
xendev->local_port = -1;
}
CAMLprim value stub_eventchn_fd(value xce)
{
CAMLparam1(xce);
int fd;
fd = xc_evtchn_fd(_H(xce));
if (fd == -1)
{
perror("xc_evtchn_fd");
caml_failwith(strerror(errno));
}
CAMLreturn(Val_int(fd));
}
CAMLprim value stub_eventchn_fd(value xce)
{
CAMLparam1(xce);
CAMLlocal1(result);
int fd;
fd = xc_evtchn_fd(_H(xce));
if (fd == -1)
caml_failwith("evtchn fd failed");
result = Val_int(fd);
CAMLreturn(result);
}
int xen_be_bind_evtchn(struct XenDevice *xendev)
{
if (xendev->local_port != -1) {
return 0;
}
xendev->local_port = xc_evtchn_bind_interdomain
(xendev->evtchndev, xendev->dom, xendev->remote_port);
if (xendev->local_port == -1) {
xen_be_printf(xendev, 0, "xc_evtchn_bind_interdomain failed\n");
return -1;
}
xen_be_printf(xendev, 2, "bind evtchn port %d\n", xendev->local_port);
qemu_set_fd_handler(xc_evtchn_fd(xendev->evtchndev),
xen_be_evtchn_event, NULL, xendev);
return 0;
}
int libxenvchan_fd_for_select(struct libxenvchan *ctrl)
{
return xc_evtchn_fd(ctrl->event);
}
static int xenpaging_wait_for_event_or_timeout(struct xenpaging *paging)
{
xc_interface *xch = paging->xc_handle;
xc_evtchn *xce = paging->vm_event.xce_handle;
char **vec, *val;
unsigned int num;
struct pollfd fd[2];
int port;
int rc;
int timeout;
/* Wait for event channel and xenstore */
fd[0].fd = xc_evtchn_fd(xce);
fd[0].events = POLLIN | POLLERR;
fd[1].fd = xs_fileno(paging->xs_handle);
fd[1].events = POLLIN | POLLERR;
/* No timeout while page-out is still in progress */
timeout = paging->use_poll_timeout ? 100 : 0;
rc = poll(fd, 2, timeout);
if ( rc < 0 )
{
if (errno == EINTR)
return 0;
PERROR("Poll exited with an error");
return -1;
}
/* First check for guest shutdown */
if ( rc && fd[1].revents & POLLIN )
{
DPRINTF("Got event from xenstore\n");
vec = xs_read_watch(paging->xs_handle, &num);
if ( vec )
{
DPRINTF("path '%s' token '%s'\n", vec[XS_WATCH_PATH], vec[XS_WATCH_TOKEN]);
if ( strcmp(vec[XS_WATCH_TOKEN], watch_token) == 0 )
{
/* If our guest disappeared, set interrupt flag and fall through */
if ( xs_is_domain_introduced(paging->xs_handle, paging->vm_event.domain_id) == false )
{
xs_unwatch(paging->xs_handle, "@releaseDomain", watch_token);
interrupted = SIGQUIT;
/* No further poll result processing */
rc = 0;
}
}
else if ( strcmp(vec[XS_WATCH_PATH], watch_target_tot_pages) == 0 )
{
int ret, target_tot_pages;
val = xs_read(paging->xs_handle, XBT_NULL, vec[XS_WATCH_PATH], NULL);
if ( val )
{
ret = sscanf(val, "%d", &target_tot_pages);
if ( ret > 0 )
{
/* KiB to pages */
target_tot_pages >>= 2;
if ( target_tot_pages < 0 || target_tot_pages > paging->max_pages )
target_tot_pages = paging->max_pages;
paging->target_tot_pages = target_tot_pages;
/* Disable poll() delay while new target is not yet reached */
paging->use_poll_timeout = 0;
DPRINTF("new target_tot_pages %d\n", target_tot_pages);
}
free(val);
}
}
/// The fd to use for select() set
EVTCHN libvchan_fd_for_select(struct libvchan *ctrl)
{
return xc_evtchn_fd(ctrl->evfd);
}