1406 lines
38 KiB
C
1406 lines
38 KiB
C
/*
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* Copyright (c) 2018 Citrix Systems Inc.
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*
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* This work is licensed under the terms of the GNU GPL, version 2 or later.
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* See the COPYING file in the top-level directory.
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*/
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#include "qemu/osdep.h"
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#include "qemu/main-loop.h"
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#include "qemu/module.h"
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#include "qemu/uuid.h"
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#include "hw/qdev-properties.h"
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#include "hw/sysbus.h"
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#include "hw/xen/xen.h"
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#include "hw/xen/xen-backend.h"
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#include "hw/xen/xen-bus.h"
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#include "hw/xen/xen-bus-helper.h"
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#include "monitor/monitor.h"
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#include "qapi/error.h"
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#include "qapi/qmp/qdict.h"
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#include "sysemu/sysemu.h"
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#include "trace.h"
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static char *xen_device_get_backend_path(XenDevice *xendev)
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{
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XenBus *xenbus = XEN_BUS(qdev_get_parent_bus(DEVICE(xendev)));
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XenDeviceClass *xendev_class = XEN_DEVICE_GET_CLASS(xendev);
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const char *type = object_get_typename(OBJECT(xendev));
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const char *backend = xendev_class->backend;
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if (!backend) {
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backend = type;
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}
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return g_strdup_printf("/local/domain/%u/backend/%s/%u/%s",
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xenbus->backend_id, backend, xendev->frontend_id,
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xendev->name);
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}
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static char *xen_device_get_frontend_path(XenDevice *xendev)
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{
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XenDeviceClass *xendev_class = XEN_DEVICE_GET_CLASS(xendev);
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const char *type = object_get_typename(OBJECT(xendev));
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const char *device = xendev_class->device;
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if (!device) {
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device = type;
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}
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return g_strdup_printf("/local/domain/%u/device/%s/%s",
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xendev->frontend_id, device, xendev->name);
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}
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static void xen_device_unplug(XenDevice *xendev, Error **errp)
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{
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ERRP_GUARD();
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XenBus *xenbus = XEN_BUS(qdev_get_parent_bus(DEVICE(xendev)));
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const char *type = object_get_typename(OBJECT(xendev));
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xs_transaction_t tid;
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trace_xen_device_unplug(type, xendev->name);
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/* Mimic the way the Xen toolstack does an unplug */
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again:
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tid = xs_transaction_start(xenbus->xsh);
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if (tid == XBT_NULL) {
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error_setg_errno(errp, errno, "failed xs_transaction_start");
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return;
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}
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xs_node_printf(xenbus->xsh, tid, xendev->backend_path, "online",
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errp, "%u", 0);
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if (*errp) {
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goto abort;
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}
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xs_node_printf(xenbus->xsh, tid, xendev->backend_path, "state",
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errp, "%u", XenbusStateClosing);
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if (*errp) {
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goto abort;
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}
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if (!xs_transaction_end(xenbus->xsh, tid, false)) {
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if (errno == EAGAIN) {
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goto again;
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}
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error_setg_errno(errp, errno, "failed xs_transaction_end");
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}
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return;
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abort:
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/*
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* We only abort if there is already a failure so ignore any error
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* from ending the transaction.
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*/
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xs_transaction_end(xenbus->xsh, tid, true);
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}
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static void xen_bus_print_dev(Monitor *mon, DeviceState *dev, int indent)
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{
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XenDevice *xendev = XEN_DEVICE(dev);
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monitor_printf(mon, "%*sname = '%s' frontend_id = %u\n",
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indent, "", xendev->name, xendev->frontend_id);
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}
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static char *xen_bus_get_dev_path(DeviceState *dev)
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{
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return xen_device_get_backend_path(XEN_DEVICE(dev));
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}
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struct XenWatch {
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char *node, *key;
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char *token;
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XenWatchHandler handler;
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void *opaque;
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Notifier notifier;
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};
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static void watch_notify(Notifier *n, void *data)
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{
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XenWatch *watch = container_of(n, XenWatch, notifier);
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const char *token = data;
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if (!strcmp(watch->token, token)) {
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watch->handler(watch->opaque);
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}
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}
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static XenWatch *new_watch(const char *node, const char *key,
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XenWatchHandler handler, void *opaque)
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{
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XenWatch *watch = g_new0(XenWatch, 1);
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QemuUUID uuid;
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qemu_uuid_generate(&uuid);
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watch->token = qemu_uuid_unparse_strdup(&uuid);
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watch->node = g_strdup(node);
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watch->key = g_strdup(key);
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watch->handler = handler;
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watch->opaque = opaque;
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watch->notifier.notify = watch_notify;
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return watch;
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}
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static void free_watch(XenWatch *watch)
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{
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g_free(watch->token);
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g_free(watch->key);
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g_free(watch->node);
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g_free(watch);
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}
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struct XenWatchList {
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struct xs_handle *xsh;
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NotifierList notifiers;
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};
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static void watch_list_event(void *opaque)
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{
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XenWatchList *watch_list = opaque;
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char **v;
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const char *token;
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v = xs_check_watch(watch_list->xsh);
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if (!v) {
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return;
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}
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token = v[XS_WATCH_TOKEN];
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notifier_list_notify(&watch_list->notifiers, (void *)token);
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free(v);
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}
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static XenWatchList *watch_list_create(struct xs_handle *xsh)
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{
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XenWatchList *watch_list = g_new0(XenWatchList, 1);
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g_assert(xsh);
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watch_list->xsh = xsh;
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notifier_list_init(&watch_list->notifiers);
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qemu_set_fd_handler(xs_fileno(watch_list->xsh), watch_list_event, NULL,
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watch_list);
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return watch_list;
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}
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static void watch_list_destroy(XenWatchList *watch_list)
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{
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g_assert(notifier_list_empty(&watch_list->notifiers));
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qemu_set_fd_handler(xs_fileno(watch_list->xsh), NULL, NULL, NULL);
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g_free(watch_list);
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}
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static XenWatch *watch_list_add(XenWatchList *watch_list, const char *node,
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const char *key, XenWatchHandler handler,
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void *opaque, Error **errp)
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{
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ERRP_GUARD();
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XenWatch *watch = new_watch(node, key, handler, opaque);
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notifier_list_add(&watch_list->notifiers, &watch->notifier);
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xs_node_watch(watch_list->xsh, node, key, watch->token, errp);
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if (*errp) {
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notifier_remove(&watch->notifier);
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free_watch(watch);
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return NULL;
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}
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return watch;
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}
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static void watch_list_remove(XenWatchList *watch_list, XenWatch *watch,
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Error **errp)
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{
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xs_node_unwatch(watch_list->xsh, watch->node, watch->key, watch->token,
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errp);
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notifier_remove(&watch->notifier);
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free_watch(watch);
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}
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static XenWatch *xen_bus_add_watch(XenBus *xenbus, const char *node,
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const char *key, XenWatchHandler handler,
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Error **errp)
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{
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trace_xen_bus_add_watch(node, key);
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return watch_list_add(xenbus->watch_list, node, key, handler, xenbus,
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errp);
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}
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static void xen_bus_remove_watch(XenBus *xenbus, XenWatch *watch,
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Error **errp)
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{
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trace_xen_bus_remove_watch(watch->node, watch->key);
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watch_list_remove(xenbus->watch_list, watch, errp);
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}
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static void xen_bus_backend_create(XenBus *xenbus, const char *type,
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const char *name, char *path,
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Error **errp)
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{
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ERRP_GUARD();
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xs_transaction_t tid;
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char **key;
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QDict *opts;
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unsigned int i, n;
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trace_xen_bus_backend_create(type, path);
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again:
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tid = xs_transaction_start(xenbus->xsh);
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if (tid == XBT_NULL) {
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error_setg(errp, "failed xs_transaction_start");
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return;
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}
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key = xs_directory(xenbus->xsh, tid, path, &n);
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if (!key) {
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if (!xs_transaction_end(xenbus->xsh, tid, true)) {
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error_setg_errno(errp, errno, "failed xs_transaction_end");
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}
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return;
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}
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opts = qdict_new();
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for (i = 0; i < n; i++) {
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char *val;
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/*
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* Assume anything found in the xenstore backend area, other than
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* the keys created for a generic XenDevice, are parameters
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* to be used to configure the backend.
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*/
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if (!strcmp(key[i], "state") ||
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!strcmp(key[i], "online") ||
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!strcmp(key[i], "frontend") ||
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!strcmp(key[i], "frontend-id") ||
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!strcmp(key[i], "hotplug-status"))
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continue;
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if (xs_node_scanf(xenbus->xsh, tid, path, key[i], NULL, "%ms",
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&val) == 1) {
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qdict_put_str(opts, key[i], val);
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free(val);
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}
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}
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free(key);
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if (!xs_transaction_end(xenbus->xsh, tid, false)) {
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qobject_unref(opts);
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if (errno == EAGAIN) {
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goto again;
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}
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error_setg_errno(errp, errno, "failed xs_transaction_end");
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return;
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}
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xen_backend_device_create(xenbus, type, name, opts, errp);
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qobject_unref(opts);
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if (*errp) {
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error_prepend(errp, "failed to create '%s' device '%s': ", type, name);
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}
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}
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static void xen_bus_type_enumerate(XenBus *xenbus, const char *type)
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{
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char *domain_path = g_strdup_printf("backend/%s/%u", type, xen_domid);
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char **backend;
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unsigned int i, n;
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trace_xen_bus_type_enumerate(type);
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backend = xs_directory(xenbus->xsh, XBT_NULL, domain_path, &n);
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if (!backend) {
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goto out;
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}
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for (i = 0; i < n; i++) {
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char *backend_path = g_strdup_printf("%s/%s", domain_path,
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backend[i]);
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enum xenbus_state state;
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unsigned int online;
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if (xs_node_scanf(xenbus->xsh, XBT_NULL, backend_path, "state",
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NULL, "%u", &state) != 1)
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state = XenbusStateUnknown;
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if (xs_node_scanf(xenbus->xsh, XBT_NULL, backend_path, "online",
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NULL, "%u", &online) != 1)
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online = 0;
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if (online && state == XenbusStateInitialising) {
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Error *local_err = NULL;
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xen_bus_backend_create(xenbus, type, backend[i], backend_path,
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&local_err);
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if (local_err) {
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error_report_err(local_err);
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}
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}
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g_free(backend_path);
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}
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free(backend);
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out:
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g_free(domain_path);
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}
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static void xen_bus_enumerate(XenBus *xenbus)
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{
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char **type;
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unsigned int i, n;
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trace_xen_bus_enumerate();
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type = xs_directory(xenbus->xsh, XBT_NULL, "backend", &n);
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if (!type) {
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return;
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}
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for (i = 0; i < n; i++) {
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xen_bus_type_enumerate(xenbus, type[i]);
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}
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free(type);
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}
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static void xen_bus_device_cleanup(XenDevice *xendev)
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{
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const char *type = object_get_typename(OBJECT(xendev));
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Error *local_err = NULL;
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trace_xen_bus_device_cleanup(type, xendev->name);
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g_assert(!xendev->backend_online);
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if (!xen_backend_try_device_destroy(xendev, &local_err)) {
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object_unparent(OBJECT(xendev));
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}
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if (local_err) {
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error_report_err(local_err);
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}
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}
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static void xen_bus_cleanup(XenBus *xenbus)
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{
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XenDevice *xendev, *next;
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trace_xen_bus_cleanup();
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QLIST_FOREACH_SAFE(xendev, &xenbus->inactive_devices, list, next) {
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g_assert(xendev->inactive);
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QLIST_REMOVE(xendev, list);
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xen_bus_device_cleanup(xendev);
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}
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}
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static void xen_bus_backend_changed(void *opaque)
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{
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XenBus *xenbus = opaque;
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xen_bus_enumerate(xenbus);
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xen_bus_cleanup(xenbus);
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}
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static void xen_bus_unrealize(BusState *bus)
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{
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XenBus *xenbus = XEN_BUS(bus);
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trace_xen_bus_unrealize();
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if (xenbus->backend_watch) {
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unsigned int i;
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for (i = 0; i < xenbus->backend_types; i++) {
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if (xenbus->backend_watch[i]) {
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xen_bus_remove_watch(xenbus, xenbus->backend_watch[i], NULL);
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}
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}
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g_free(xenbus->backend_watch);
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xenbus->backend_watch = NULL;
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}
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if (xenbus->watch_list) {
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watch_list_destroy(xenbus->watch_list);
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xenbus->watch_list = NULL;
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}
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if (xenbus->xsh) {
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xs_close(xenbus->xsh);
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}
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}
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static void xen_bus_realize(BusState *bus, Error **errp)
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{
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char *key = g_strdup_printf("%u", xen_domid);
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XenBus *xenbus = XEN_BUS(bus);
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unsigned int domid;
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const char **type;
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unsigned int i;
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Error *local_err = NULL;
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trace_xen_bus_realize();
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xenbus->xsh = xs_open(0);
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if (!xenbus->xsh) {
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error_setg_errno(errp, errno, "failed xs_open");
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goto fail;
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}
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if (xs_node_scanf(xenbus->xsh, XBT_NULL, "", /* domain root node */
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"domid", NULL, "%u", &domid) == 1) {
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xenbus->backend_id = domid;
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} else {
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xenbus->backend_id = 0; /* Assume lack of node means dom0 */
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}
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|
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xenbus->watch_list = watch_list_create(xenbus->xsh);
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module_call_init(MODULE_INIT_XEN_BACKEND);
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type = xen_backend_get_types(&xenbus->backend_types);
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xenbus->backend_watch = g_new(XenWatch *, xenbus->backend_types);
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|
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for (i = 0; i < xenbus->backend_types; i++) {
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char *node = g_strdup_printf("backend/%s", type[i]);
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xenbus->backend_watch[i] =
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xen_bus_add_watch(xenbus, node, key, xen_bus_backend_changed,
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&local_err);
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if (local_err) {
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/* This need not be treated as a hard error so don't propagate */
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error_reportf_err(local_err,
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"failed to set up '%s' enumeration watch: ",
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type[i]);
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}
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g_free(node);
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}
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g_free(type);
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g_free(key);
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return;
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fail:
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xen_bus_unrealize(bus);
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g_free(key);
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}
|
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|
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static void xen_bus_unplug_request(HotplugHandler *hotplug,
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DeviceState *dev,
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Error **errp)
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{
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XenDevice *xendev = XEN_DEVICE(dev);
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|
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xen_device_unplug(xendev, errp);
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}
|
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|
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static void xen_bus_class_init(ObjectClass *class, void *data)
|
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{
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BusClass *bus_class = BUS_CLASS(class);
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HotplugHandlerClass *hotplug_class = HOTPLUG_HANDLER_CLASS(class);
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|
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bus_class->print_dev = xen_bus_print_dev;
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bus_class->get_dev_path = xen_bus_get_dev_path;
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bus_class->realize = xen_bus_realize;
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bus_class->unrealize = xen_bus_unrealize;
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|
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hotplug_class->unplug_request = xen_bus_unplug_request;
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}
|
|
|
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static const TypeInfo xen_bus_type_info = {
|
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.name = TYPE_XEN_BUS,
|
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.parent = TYPE_BUS,
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.instance_size = sizeof(XenBus),
|
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.class_size = sizeof(XenBusClass),
|
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.class_init = xen_bus_class_init,
|
|
.interfaces = (InterfaceInfo[]) {
|
|
{ TYPE_HOTPLUG_HANDLER },
|
|
{ }
|
|
},
|
|
};
|
|
|
|
void xen_device_backend_printf(XenDevice *xendev, const char *key,
|
|
const char *fmt, ...)
|
|
{
|
|
XenBus *xenbus = XEN_BUS(qdev_get_parent_bus(DEVICE(xendev)));
|
|
Error *local_err = NULL;
|
|
va_list ap;
|
|
|
|
g_assert(xenbus->xsh);
|
|
|
|
va_start(ap, fmt);
|
|
xs_node_vprintf(xenbus->xsh, XBT_NULL, xendev->backend_path, key,
|
|
&local_err, fmt, ap);
|
|
va_end(ap);
|
|
|
|
if (local_err) {
|
|
error_report_err(local_err);
|
|
}
|
|
}
|
|
|
|
static int xen_device_backend_scanf(XenDevice *xendev, const char *key,
|
|
const char *fmt, ...)
|
|
{
|
|
XenBus *xenbus = XEN_BUS(qdev_get_parent_bus(DEVICE(xendev)));
|
|
va_list ap;
|
|
int rc;
|
|
|
|
g_assert(xenbus->xsh);
|
|
|
|
va_start(ap, fmt);
|
|
rc = xs_node_vscanf(xenbus->xsh, XBT_NULL, xendev->backend_path, key,
|
|
NULL, fmt, ap);
|
|
va_end(ap);
|
|
|
|
return rc;
|
|
}
|
|
|
|
void xen_device_backend_set_state(XenDevice *xendev,
|
|
enum xenbus_state state)
|
|
{
|
|
const char *type = object_get_typename(OBJECT(xendev));
|
|
|
|
if (xendev->backend_state == state) {
|
|
return;
|
|
}
|
|
|
|
trace_xen_device_backend_state(type, xendev->name,
|
|
xs_strstate(state));
|
|
|
|
xendev->backend_state = state;
|
|
xen_device_backend_printf(xendev, "state", "%u", state);
|
|
}
|
|
|
|
enum xenbus_state xen_device_backend_get_state(XenDevice *xendev)
|
|
{
|
|
return xendev->backend_state;
|
|
}
|
|
|
|
static void xen_device_backend_set_online(XenDevice *xendev, bool online)
|
|
{
|
|
const char *type = object_get_typename(OBJECT(xendev));
|
|
|
|
if (xendev->backend_online == online) {
|
|
return;
|
|
}
|
|
|
|
trace_xen_device_backend_online(type, xendev->name, online);
|
|
|
|
xendev->backend_online = online;
|
|
xen_device_backend_printf(xendev, "online", "%u", online);
|
|
}
|
|
|
|
/*
|
|
* Tell from the state whether the frontend is likely alive,
|
|
* i.e. it will react to a change of state of the backend.
|
|
*/
|
|
static bool xen_device_frontend_is_active(XenDevice *xendev)
|
|
{
|
|
switch (xendev->frontend_state) {
|
|
case XenbusStateInitWait:
|
|
case XenbusStateInitialised:
|
|
case XenbusStateConnected:
|
|
case XenbusStateClosing:
|
|
return true;
|
|
default:
|
|
return false;
|
|
}
|
|
}
|
|
|
|
static void xen_device_backend_changed(void *opaque)
|
|
{
|
|
XenDevice *xendev = opaque;
|
|
const char *type = object_get_typename(OBJECT(xendev));
|
|
enum xenbus_state state;
|
|
unsigned int online;
|
|
|
|
trace_xen_device_backend_changed(type, xendev->name);
|
|
|
|
if (xen_device_backend_scanf(xendev, "state", "%u", &state) != 1) {
|
|
state = XenbusStateUnknown;
|
|
}
|
|
|
|
xen_device_backend_set_state(xendev, state);
|
|
|
|
if (xen_device_backend_scanf(xendev, "online", "%u", &online) != 1) {
|
|
online = 0;
|
|
}
|
|
|
|
xen_device_backend_set_online(xendev, !!online);
|
|
|
|
/*
|
|
* If the toolstack (or unplug request callback) has set the backend
|
|
* state to Closing, but there is no active frontend then set the
|
|
* backend state to Closed.
|
|
*/
|
|
if (state == XenbusStateClosing &&
|
|
!xen_device_frontend_is_active(xendev)) {
|
|
xen_device_backend_set_state(xendev, XenbusStateClosed);
|
|
}
|
|
|
|
/*
|
|
* If a backend is still 'online' then we should leave it alone but,
|
|
* if a backend is not 'online', then the device is a candidate
|
|
* for destruction. Hence add it to the 'inactive' list to be cleaned
|
|
* by xen_bus_cleanup().
|
|
*/
|
|
if (!online &&
|
|
(state == XenbusStateClosed || state == XenbusStateInitialising ||
|
|
state == XenbusStateInitWait || state == XenbusStateUnknown) &&
|
|
!xendev->inactive) {
|
|
XenBus *xenbus = XEN_BUS(qdev_get_parent_bus(DEVICE(xendev)));
|
|
|
|
xendev->inactive = true;
|
|
QLIST_INSERT_HEAD(&xenbus->inactive_devices, xendev, list);
|
|
|
|
/*
|
|
* Re-write the state to cause a XenBus backend_watch notification,
|
|
* resulting in a call to xen_bus_cleanup().
|
|
*/
|
|
xen_device_backend_printf(xendev, "state", "%u", state);
|
|
}
|
|
}
|
|
|
|
static XenWatch *xen_device_add_watch(XenDevice *xendev, const char *node,
|
|
const char *key,
|
|
XenWatchHandler handler,
|
|
Error **errp)
|
|
{
|
|
const char *type = object_get_typename(OBJECT(xendev));
|
|
|
|
trace_xen_device_add_watch(type, xendev->name, node, key);
|
|
|
|
return watch_list_add(xendev->watch_list, node, key, handler, xendev,
|
|
errp);
|
|
}
|
|
|
|
static void xen_device_remove_watch(XenDevice *xendev, XenWatch *watch,
|
|
Error **errp)
|
|
{
|
|
const char *type = object_get_typename(OBJECT(xendev));
|
|
|
|
trace_xen_device_remove_watch(type, xendev->name, watch->node,
|
|
watch->key);
|
|
|
|
watch_list_remove(xendev->watch_list, watch, errp);
|
|
}
|
|
|
|
|
|
static void xen_device_backend_create(XenDevice *xendev, Error **errp)
|
|
{
|
|
ERRP_GUARD();
|
|
XenBus *xenbus = XEN_BUS(qdev_get_parent_bus(DEVICE(xendev)));
|
|
struct xs_permissions perms[2];
|
|
|
|
xendev->backend_path = xen_device_get_backend_path(xendev);
|
|
|
|
perms[0].id = xenbus->backend_id;
|
|
perms[0].perms = XS_PERM_NONE;
|
|
perms[1].id = xendev->frontend_id;
|
|
perms[1].perms = XS_PERM_READ;
|
|
|
|
g_assert(xenbus->xsh);
|
|
|
|
xs_node_create(xenbus->xsh, XBT_NULL, xendev->backend_path, perms,
|
|
ARRAY_SIZE(perms), errp);
|
|
if (*errp) {
|
|
error_prepend(errp, "failed to create backend: ");
|
|
return;
|
|
}
|
|
|
|
xendev->backend_state_watch =
|
|
xen_device_add_watch(xendev, xendev->backend_path,
|
|
"state", xen_device_backend_changed,
|
|
errp);
|
|
if (*errp) {
|
|
error_prepend(errp, "failed to watch backend state: ");
|
|
return;
|
|
}
|
|
|
|
xendev->backend_online_watch =
|
|
xen_device_add_watch(xendev, xendev->backend_path,
|
|
"online", xen_device_backend_changed,
|
|
errp);
|
|
if (*errp) {
|
|
error_prepend(errp, "failed to watch backend online: ");
|
|
return;
|
|
}
|
|
}
|
|
|
|
static void xen_device_backend_destroy(XenDevice *xendev)
|
|
{
|
|
XenBus *xenbus = XEN_BUS(qdev_get_parent_bus(DEVICE(xendev)));
|
|
Error *local_err = NULL;
|
|
|
|
if (xendev->backend_online_watch) {
|
|
xen_device_remove_watch(xendev, xendev->backend_online_watch, NULL);
|
|
xendev->backend_online_watch = NULL;
|
|
}
|
|
|
|
if (xendev->backend_state_watch) {
|
|
xen_device_remove_watch(xendev, xendev->backend_state_watch, NULL);
|
|
xendev->backend_state_watch = NULL;
|
|
}
|
|
|
|
if (!xendev->backend_path) {
|
|
return;
|
|
}
|
|
|
|
g_assert(xenbus->xsh);
|
|
|
|
xs_node_destroy(xenbus->xsh, XBT_NULL, xendev->backend_path,
|
|
&local_err);
|
|
g_free(xendev->backend_path);
|
|
xendev->backend_path = NULL;
|
|
|
|
if (local_err) {
|
|
error_report_err(local_err);
|
|
}
|
|
}
|
|
|
|
void xen_device_frontend_printf(XenDevice *xendev, const char *key,
|
|
const char *fmt, ...)
|
|
{
|
|
XenBus *xenbus = XEN_BUS(qdev_get_parent_bus(DEVICE(xendev)));
|
|
Error *local_err = NULL;
|
|
va_list ap;
|
|
|
|
g_assert(xenbus->xsh);
|
|
|
|
va_start(ap, fmt);
|
|
xs_node_vprintf(xenbus->xsh, XBT_NULL, xendev->frontend_path, key,
|
|
&local_err, fmt, ap);
|
|
va_end(ap);
|
|
|
|
if (local_err) {
|
|
error_report_err(local_err);
|
|
}
|
|
}
|
|
|
|
int xen_device_frontend_scanf(XenDevice *xendev, const char *key,
|
|
const char *fmt, ...)
|
|
{
|
|
XenBus *xenbus = XEN_BUS(qdev_get_parent_bus(DEVICE(xendev)));
|
|
va_list ap;
|
|
int rc;
|
|
|
|
g_assert(xenbus->xsh);
|
|
|
|
va_start(ap, fmt);
|
|
rc = xs_node_vscanf(xenbus->xsh, XBT_NULL, xendev->frontend_path, key,
|
|
NULL, fmt, ap);
|
|
va_end(ap);
|
|
|
|
return rc;
|
|
}
|
|
|
|
static void xen_device_frontend_set_state(XenDevice *xendev,
|
|
enum xenbus_state state,
|
|
bool publish)
|
|
{
|
|
const char *type = object_get_typename(OBJECT(xendev));
|
|
|
|
if (xendev->frontend_state == state) {
|
|
return;
|
|
}
|
|
|
|
trace_xen_device_frontend_state(type, xendev->name,
|
|
xs_strstate(state));
|
|
|
|
xendev->frontend_state = state;
|
|
if (publish) {
|
|
xen_device_frontend_printf(xendev, "state", "%u", state);
|
|
}
|
|
}
|
|
|
|
static void xen_device_frontend_changed(void *opaque)
|
|
{
|
|
XenDevice *xendev = opaque;
|
|
XenDeviceClass *xendev_class = XEN_DEVICE_GET_CLASS(xendev);
|
|
const char *type = object_get_typename(OBJECT(xendev));
|
|
enum xenbus_state state;
|
|
|
|
trace_xen_device_frontend_changed(type, xendev->name);
|
|
|
|
if (xen_device_frontend_scanf(xendev, "state", "%u", &state) != 1) {
|
|
state = XenbusStateUnknown;
|
|
}
|
|
|
|
xen_device_frontend_set_state(xendev, state, false);
|
|
|
|
if (state == XenbusStateInitialising &&
|
|
xendev->backend_state == XenbusStateClosed &&
|
|
xendev->backend_online) {
|
|
/*
|
|
* The frontend is re-initializing so switch back to
|
|
* InitWait.
|
|
*/
|
|
xen_device_backend_set_state(xendev, XenbusStateInitWait);
|
|
return;
|
|
}
|
|
|
|
if (xendev_class->frontend_changed) {
|
|
Error *local_err = NULL;
|
|
|
|
xendev_class->frontend_changed(xendev, state, &local_err);
|
|
|
|
if (local_err) {
|
|
error_reportf_err(local_err, "frontend change error: ");
|
|
}
|
|
}
|
|
}
|
|
|
|
static bool xen_device_frontend_exists(XenDevice *xendev)
|
|
{
|
|
enum xenbus_state state;
|
|
|
|
return (xen_device_frontend_scanf(xendev, "state", "%u", &state) == 1);
|
|
}
|
|
|
|
static void xen_device_frontend_create(XenDevice *xendev, Error **errp)
|
|
{
|
|
ERRP_GUARD();
|
|
XenBus *xenbus = XEN_BUS(qdev_get_parent_bus(DEVICE(xendev)));
|
|
struct xs_permissions perms[2];
|
|
|
|
xendev->frontend_path = xen_device_get_frontend_path(xendev);
|
|
|
|
/*
|
|
* The frontend area may have already been created by a legacy
|
|
* toolstack.
|
|
*/
|
|
if (!xen_device_frontend_exists(xendev)) {
|
|
perms[0].id = xendev->frontend_id;
|
|
perms[0].perms = XS_PERM_NONE;
|
|
perms[1].id = xenbus->backend_id;
|
|
perms[1].perms = XS_PERM_READ | XS_PERM_WRITE;
|
|
|
|
g_assert(xenbus->xsh);
|
|
|
|
xs_node_create(xenbus->xsh, XBT_NULL, xendev->frontend_path, perms,
|
|
ARRAY_SIZE(perms), errp);
|
|
if (*errp) {
|
|
error_prepend(errp, "failed to create frontend: ");
|
|
return;
|
|
}
|
|
}
|
|
|
|
xendev->frontend_state_watch =
|
|
xen_device_add_watch(xendev, xendev->frontend_path, "state",
|
|
xen_device_frontend_changed, errp);
|
|
if (*errp) {
|
|
error_prepend(errp, "failed to watch frontend state: ");
|
|
}
|
|
}
|
|
|
|
static void xen_device_frontend_destroy(XenDevice *xendev)
|
|
{
|
|
XenBus *xenbus = XEN_BUS(qdev_get_parent_bus(DEVICE(xendev)));
|
|
Error *local_err = NULL;
|
|
|
|
if (xendev->frontend_state_watch) {
|
|
xen_device_remove_watch(xendev, xendev->frontend_state_watch,
|
|
NULL);
|
|
xendev->frontend_state_watch = NULL;
|
|
}
|
|
|
|
if (!xendev->frontend_path) {
|
|
return;
|
|
}
|
|
|
|
g_assert(xenbus->xsh);
|
|
|
|
xs_node_destroy(xenbus->xsh, XBT_NULL, xendev->frontend_path,
|
|
&local_err);
|
|
g_free(xendev->frontend_path);
|
|
xendev->frontend_path = NULL;
|
|
|
|
if (local_err) {
|
|
error_report_err(local_err);
|
|
}
|
|
}
|
|
|
|
void xen_device_set_max_grant_refs(XenDevice *xendev, unsigned int nr_refs,
|
|
Error **errp)
|
|
{
|
|
if (xengnttab_set_max_grants(xendev->xgth, nr_refs)) {
|
|
error_setg_errno(errp, errno, "xengnttab_set_max_grants failed");
|
|
}
|
|
}
|
|
|
|
void *xen_device_map_grant_refs(XenDevice *xendev, uint32_t *refs,
|
|
unsigned int nr_refs, int prot,
|
|
Error **errp)
|
|
{
|
|
void *map = xengnttab_map_domain_grant_refs(xendev->xgth, nr_refs,
|
|
xendev->frontend_id, refs,
|
|
prot);
|
|
|
|
if (!map) {
|
|
error_setg_errno(errp, errno,
|
|
"xengnttab_map_domain_grant_refs failed");
|
|
}
|
|
|
|
return map;
|
|
}
|
|
|
|
void xen_device_unmap_grant_refs(XenDevice *xendev, void *map,
|
|
unsigned int nr_refs, Error **errp)
|
|
{
|
|
if (xengnttab_unmap(xendev->xgth, map, nr_refs)) {
|
|
error_setg_errno(errp, errno, "xengnttab_unmap failed");
|
|
}
|
|
}
|
|
|
|
static void compat_copy_grant_refs(XenDevice *xendev, bool to_domain,
|
|
XenDeviceGrantCopySegment segs[],
|
|
unsigned int nr_segs, Error **errp)
|
|
{
|
|
uint32_t *refs = g_new(uint32_t, nr_segs);
|
|
int prot = to_domain ? PROT_WRITE : PROT_READ;
|
|
void *map;
|
|
unsigned int i;
|
|
|
|
for (i = 0; i < nr_segs; i++) {
|
|
XenDeviceGrantCopySegment *seg = &segs[i];
|
|
|
|
refs[i] = to_domain ? seg->dest.foreign.ref :
|
|
seg->source.foreign.ref;
|
|
}
|
|
|
|
map = xengnttab_map_domain_grant_refs(xendev->xgth, nr_segs,
|
|
xendev->frontend_id, refs,
|
|
prot);
|
|
if (!map) {
|
|
error_setg_errno(errp, errno,
|
|
"xengnttab_map_domain_grant_refs failed");
|
|
goto done;
|
|
}
|
|
|
|
for (i = 0; i < nr_segs; i++) {
|
|
XenDeviceGrantCopySegment *seg = &segs[i];
|
|
void *page = map + (i * XC_PAGE_SIZE);
|
|
|
|
if (to_domain) {
|
|
memcpy(page + seg->dest.foreign.offset, seg->source.virt,
|
|
seg->len);
|
|
} else {
|
|
memcpy(seg->dest.virt, page + seg->source.foreign.offset,
|
|
seg->len);
|
|
}
|
|
}
|
|
|
|
if (xengnttab_unmap(xendev->xgth, map, nr_segs)) {
|
|
error_setg_errno(errp, errno, "xengnttab_unmap failed");
|
|
}
|
|
|
|
done:
|
|
g_free(refs);
|
|
}
|
|
|
|
void xen_device_copy_grant_refs(XenDevice *xendev, bool to_domain,
|
|
XenDeviceGrantCopySegment segs[],
|
|
unsigned int nr_segs, Error **errp)
|
|
{
|
|
xengnttab_grant_copy_segment_t *xengnttab_segs;
|
|
unsigned int i;
|
|
|
|
if (!xendev->feature_grant_copy) {
|
|
compat_copy_grant_refs(xendev, to_domain, segs, nr_segs, errp);
|
|
return;
|
|
}
|
|
|
|
xengnttab_segs = g_new0(xengnttab_grant_copy_segment_t, nr_segs);
|
|
|
|
for (i = 0; i < nr_segs; i++) {
|
|
XenDeviceGrantCopySegment *seg = &segs[i];
|
|
xengnttab_grant_copy_segment_t *xengnttab_seg = &xengnttab_segs[i];
|
|
|
|
if (to_domain) {
|
|
xengnttab_seg->flags = GNTCOPY_dest_gref;
|
|
xengnttab_seg->dest.foreign.domid = xendev->frontend_id;
|
|
xengnttab_seg->dest.foreign.ref = seg->dest.foreign.ref;
|
|
xengnttab_seg->dest.foreign.offset = seg->dest.foreign.offset;
|
|
xengnttab_seg->source.virt = seg->source.virt;
|
|
} else {
|
|
xengnttab_seg->flags = GNTCOPY_source_gref;
|
|
xengnttab_seg->source.foreign.domid = xendev->frontend_id;
|
|
xengnttab_seg->source.foreign.ref = seg->source.foreign.ref;
|
|
xengnttab_seg->source.foreign.offset =
|
|
seg->source.foreign.offset;
|
|
xengnttab_seg->dest.virt = seg->dest.virt;
|
|
}
|
|
|
|
xengnttab_seg->len = seg->len;
|
|
}
|
|
|
|
if (xengnttab_grant_copy(xendev->xgth, nr_segs, xengnttab_segs)) {
|
|
error_setg_errno(errp, errno, "xengnttab_grant_copy failed");
|
|
goto done;
|
|
}
|
|
|
|
for (i = 0; i < nr_segs; i++) {
|
|
xengnttab_grant_copy_segment_t *xengnttab_seg = &xengnttab_segs[i];
|
|
|
|
if (xengnttab_seg->status != GNTST_okay) {
|
|
error_setg(errp, "xengnttab_grant_copy seg[%u] failed", i);
|
|
break;
|
|
}
|
|
}
|
|
|
|
done:
|
|
g_free(xengnttab_segs);
|
|
}
|
|
|
|
struct XenEventChannel {
|
|
QLIST_ENTRY(XenEventChannel) list;
|
|
AioContext *ctx;
|
|
xenevtchn_handle *xeh;
|
|
evtchn_port_t local_port;
|
|
XenEventHandler handler;
|
|
void *opaque;
|
|
};
|
|
|
|
static bool xen_device_poll(void *opaque)
|
|
{
|
|
XenEventChannel *channel = opaque;
|
|
|
|
return channel->handler(channel->opaque);
|
|
}
|
|
|
|
static void xen_device_event(void *opaque)
|
|
{
|
|
XenEventChannel *channel = opaque;
|
|
unsigned long port = xenevtchn_pending(channel->xeh);
|
|
|
|
if (port == channel->local_port) {
|
|
xen_device_poll(channel);
|
|
|
|
xenevtchn_unmask(channel->xeh, port);
|
|
}
|
|
}
|
|
|
|
void xen_device_set_event_channel_context(XenDevice *xendev,
|
|
XenEventChannel *channel,
|
|
AioContext *ctx,
|
|
Error **errp)
|
|
{
|
|
if (!channel) {
|
|
error_setg(errp, "bad channel");
|
|
return;
|
|
}
|
|
|
|
if (channel->ctx)
|
|
aio_set_fd_handler(channel->ctx, xenevtchn_fd(channel->xeh), true,
|
|
NULL, NULL, NULL, NULL, NULL);
|
|
|
|
channel->ctx = ctx;
|
|
aio_set_fd_handler(channel->ctx, xenevtchn_fd(channel->xeh), true,
|
|
xen_device_event, NULL, xen_device_poll, NULL, channel);
|
|
}
|
|
|
|
XenEventChannel *xen_device_bind_event_channel(XenDevice *xendev,
|
|
unsigned int port,
|
|
XenEventHandler handler,
|
|
void *opaque, Error **errp)
|
|
{
|
|
XenEventChannel *channel = g_new0(XenEventChannel, 1);
|
|
xenevtchn_port_or_error_t local_port;
|
|
|
|
channel->xeh = xenevtchn_open(NULL, 0);
|
|
if (!channel->xeh) {
|
|
error_setg_errno(errp, errno, "failed xenevtchn_open");
|
|
goto fail;
|
|
}
|
|
|
|
local_port = xenevtchn_bind_interdomain(channel->xeh,
|
|
xendev->frontend_id,
|
|
port);
|
|
if (local_port < 0) {
|
|
error_setg_errno(errp, errno, "xenevtchn_bind_interdomain failed");
|
|
goto fail;
|
|
}
|
|
|
|
channel->local_port = local_port;
|
|
channel->handler = handler;
|
|
channel->opaque = opaque;
|
|
|
|
/* Only reason for failure is a NULL channel */
|
|
xen_device_set_event_channel_context(xendev, channel,
|
|
qemu_get_aio_context(),
|
|
&error_abort);
|
|
|
|
QLIST_INSERT_HEAD(&xendev->event_channels, channel, list);
|
|
|
|
return channel;
|
|
|
|
fail:
|
|
if (channel->xeh) {
|
|
xenevtchn_close(channel->xeh);
|
|
}
|
|
|
|
g_free(channel);
|
|
|
|
return NULL;
|
|
}
|
|
|
|
void xen_device_notify_event_channel(XenDevice *xendev,
|
|
XenEventChannel *channel,
|
|
Error **errp)
|
|
{
|
|
if (!channel) {
|
|
error_setg(errp, "bad channel");
|
|
return;
|
|
}
|
|
|
|
if (xenevtchn_notify(channel->xeh, channel->local_port) < 0) {
|
|
error_setg_errno(errp, errno, "xenevtchn_notify failed");
|
|
}
|
|
}
|
|
|
|
void xen_device_unbind_event_channel(XenDevice *xendev,
|
|
XenEventChannel *channel,
|
|
Error **errp)
|
|
{
|
|
if (!channel) {
|
|
error_setg(errp, "bad channel");
|
|
return;
|
|
}
|
|
|
|
QLIST_REMOVE(channel, list);
|
|
|
|
aio_set_fd_handler(channel->ctx, xenevtchn_fd(channel->xeh), true,
|
|
NULL, NULL, NULL, NULL, NULL);
|
|
|
|
if (xenevtchn_unbind(channel->xeh, channel->local_port) < 0) {
|
|
error_setg_errno(errp, errno, "xenevtchn_unbind failed");
|
|
}
|
|
|
|
xenevtchn_close(channel->xeh);
|
|
g_free(channel);
|
|
}
|
|
|
|
static void xen_device_unrealize(DeviceState *dev)
|
|
{
|
|
XenDevice *xendev = XEN_DEVICE(dev);
|
|
XenDeviceClass *xendev_class = XEN_DEVICE_GET_CLASS(xendev);
|
|
const char *type = object_get_typename(OBJECT(xendev));
|
|
XenEventChannel *channel, *next;
|
|
|
|
if (!xendev->name) {
|
|
return;
|
|
}
|
|
|
|
trace_xen_device_unrealize(type, xendev->name);
|
|
|
|
if (xendev->exit.notify) {
|
|
qemu_remove_exit_notifier(&xendev->exit);
|
|
xendev->exit.notify = NULL;
|
|
}
|
|
|
|
if (xendev_class->unrealize) {
|
|
xendev_class->unrealize(xendev);
|
|
}
|
|
|
|
/* Make sure all event channels are cleaned up */
|
|
QLIST_FOREACH_SAFE(channel, &xendev->event_channels, list, next) {
|
|
xen_device_unbind_event_channel(xendev, channel, NULL);
|
|
}
|
|
|
|
xen_device_frontend_destroy(xendev);
|
|
xen_device_backend_destroy(xendev);
|
|
|
|
if (xendev->xgth) {
|
|
xengnttab_close(xendev->xgth);
|
|
xendev->xgth = NULL;
|
|
}
|
|
|
|
if (xendev->watch_list) {
|
|
watch_list_destroy(xendev->watch_list);
|
|
xendev->watch_list = NULL;
|
|
}
|
|
|
|
if (xendev->xsh) {
|
|
xs_close(xendev->xsh);
|
|
xendev->xsh = NULL;
|
|
}
|
|
|
|
g_free(xendev->name);
|
|
xendev->name = NULL;
|
|
}
|
|
|
|
static void xen_device_exit(Notifier *n, void *data)
|
|
{
|
|
XenDevice *xendev = container_of(n, XenDevice, exit);
|
|
|
|
xen_device_unrealize(DEVICE(xendev));
|
|
}
|
|
|
|
static void xen_device_realize(DeviceState *dev, Error **errp)
|
|
{
|
|
ERRP_GUARD();
|
|
XenDevice *xendev = XEN_DEVICE(dev);
|
|
XenDeviceClass *xendev_class = XEN_DEVICE_GET_CLASS(xendev);
|
|
XenBus *xenbus = XEN_BUS(qdev_get_parent_bus(DEVICE(xendev)));
|
|
const char *type = object_get_typename(OBJECT(xendev));
|
|
|
|
if (xendev->frontend_id == DOMID_INVALID) {
|
|
xendev->frontend_id = xen_domid;
|
|
}
|
|
|
|
if (xendev->frontend_id >= DOMID_FIRST_RESERVED) {
|
|
error_setg(errp, "invalid frontend-id");
|
|
goto unrealize;
|
|
}
|
|
|
|
if (!xendev_class->get_name) {
|
|
error_setg(errp, "get_name method not implemented");
|
|
goto unrealize;
|
|
}
|
|
|
|
xendev->name = xendev_class->get_name(xendev, errp);
|
|
if (*errp) {
|
|
error_prepend(errp, "failed to get device name: ");
|
|
goto unrealize;
|
|
}
|
|
|
|
trace_xen_device_realize(type, xendev->name);
|
|
|
|
xendev->xsh = xs_open(0);
|
|
if (!xendev->xsh) {
|
|
error_setg_errno(errp, errno, "failed xs_open");
|
|
goto unrealize;
|
|
}
|
|
|
|
xendev->watch_list = watch_list_create(xendev->xsh);
|
|
|
|
xendev->xgth = xengnttab_open(NULL, 0);
|
|
if (!xendev->xgth) {
|
|
error_setg_errno(errp, errno, "failed xengnttab_open");
|
|
goto unrealize;
|
|
}
|
|
|
|
xendev->feature_grant_copy =
|
|
(xengnttab_grant_copy(xendev->xgth, 0, NULL) == 0);
|
|
|
|
xen_device_backend_create(xendev, errp);
|
|
if (*errp) {
|
|
goto unrealize;
|
|
}
|
|
|
|
xen_device_frontend_create(xendev, errp);
|
|
if (*errp) {
|
|
goto unrealize;
|
|
}
|
|
|
|
if (xendev_class->realize) {
|
|
xendev_class->realize(xendev, errp);
|
|
if (*errp) {
|
|
goto unrealize;
|
|
}
|
|
}
|
|
|
|
xen_device_backend_printf(xendev, "frontend", "%s",
|
|
xendev->frontend_path);
|
|
xen_device_backend_printf(xendev, "frontend-id", "%u",
|
|
xendev->frontend_id);
|
|
xen_device_backend_printf(xendev, "hotplug-status", "connected");
|
|
|
|
xen_device_backend_set_online(xendev, true);
|
|
xen_device_backend_set_state(xendev, XenbusStateInitWait);
|
|
|
|
if (!xen_device_frontend_exists(xendev)) {
|
|
xen_device_frontend_printf(xendev, "backend", "%s",
|
|
xendev->backend_path);
|
|
xen_device_frontend_printf(xendev, "backend-id", "%u",
|
|
xenbus->backend_id);
|
|
|
|
xen_device_frontend_set_state(xendev, XenbusStateInitialising, true);
|
|
}
|
|
|
|
xendev->exit.notify = xen_device_exit;
|
|
qemu_add_exit_notifier(&xendev->exit);
|
|
return;
|
|
|
|
unrealize:
|
|
xen_device_unrealize(dev);
|
|
}
|
|
|
|
static Property xen_device_props[] = {
|
|
DEFINE_PROP_UINT16("frontend-id", XenDevice, frontend_id,
|
|
DOMID_INVALID),
|
|
DEFINE_PROP_END_OF_LIST()
|
|
};
|
|
|
|
static void xen_device_class_init(ObjectClass *class, void *data)
|
|
{
|
|
DeviceClass *dev_class = DEVICE_CLASS(class);
|
|
|
|
dev_class->realize = xen_device_realize;
|
|
dev_class->unrealize = xen_device_unrealize;
|
|
device_class_set_props(dev_class, xen_device_props);
|
|
dev_class->bus_type = TYPE_XEN_BUS;
|
|
}
|
|
|
|
static const TypeInfo xen_device_type_info = {
|
|
.name = TYPE_XEN_DEVICE,
|
|
.parent = TYPE_DEVICE,
|
|
.instance_size = sizeof(XenDevice),
|
|
.abstract = true,
|
|
.class_size = sizeof(XenDeviceClass),
|
|
.class_init = xen_device_class_init,
|
|
};
|
|
|
|
typedef struct XenBridge {
|
|
SysBusDevice busdev;
|
|
} XenBridge;
|
|
|
|
#define TYPE_XEN_BRIDGE "xen-bridge"
|
|
|
|
static const TypeInfo xen_bridge_type_info = {
|
|
.name = TYPE_XEN_BRIDGE,
|
|
.parent = TYPE_SYS_BUS_DEVICE,
|
|
.instance_size = sizeof(XenBridge),
|
|
};
|
|
|
|
static void xen_register_types(void)
|
|
{
|
|
type_register_static(&xen_bridge_type_info);
|
|
type_register_static(&xen_bus_type_info);
|
|
type_register_static(&xen_device_type_info);
|
|
}
|
|
|
|
type_init(xen_register_types)
|
|
|
|
void xen_bus_init(void)
|
|
{
|
|
DeviceState *dev = qdev_new(TYPE_XEN_BRIDGE);
|
|
BusState *bus = qbus_new(TYPE_XEN_BUS, dev, NULL);
|
|
|
|
sysbus_realize_and_unref(SYS_BUS_DEVICE(dev), &error_fatal);
|
|
qbus_set_bus_hotplug_handler(bus);
|
|
}
|