1 /* 2 * vhost shadow virtqueue 3 * 4 * SPDX-FileCopyrightText: Red Hat, Inc. 2021 5 * SPDX-FileContributor: Author: Eugenio Pérez <eperezma@redhat.com> 6 * 7 * SPDX-License-Identifier: GPL-2.0-or-later 8 */ 9 10 #ifndef VHOST_SHADOW_VIRTQUEUE_H 11 #define VHOST_SHADOW_VIRTQUEUE_H 12 13 #include "qemu/event_notifier.h" 14 15 /* Shadow virtqueue to relay notifications */ 16 typedef struct VhostShadowVirtqueue { 17 /* Shadow kick notifier, sent to vhost */ 18 EventNotifier hdev_kick; 19 /* Shadow call notifier, sent to vhost */ 20 EventNotifier hdev_call; 21 22 /* 23 * Borrowed virtqueue's guest to host notifier. To borrow it in this event 24 * notifier allows to recover the VhostShadowVirtqueue from the event loop 25 * easily. If we use the VirtQueue's one, we don't have an easy way to 26 * retrieve VhostShadowVirtqueue. 27 * 28 * So shadow virtqueue must not clean it, or we would lose VirtQueue one. 29 */ 30 EventNotifier svq_kick; 31 32 /* Guest's call notifier, where the SVQ calls guest. */ 33 EventNotifier svq_call; 34 } VhostShadowVirtqueue; 35 36 bool vhost_svq_valid_features(uint64_t features, Error **errp); 37 38 void vhost_svq_set_svq_kick_fd(VhostShadowVirtqueue *svq, int svq_kick_fd); 39 void vhost_svq_set_svq_call_fd(VhostShadowVirtqueue *svq, int call_fd); 40 41 void vhost_svq_stop(VhostShadowVirtqueue *svq); 42 43 VhostShadowVirtqueue *vhost_svq_new(void); 44 45 void vhost_svq_free(gpointer vq); 46 G_DEFINE_AUTOPTR_CLEANUP_FUNC(VhostShadowVirtqueue, vhost_svq_free); 47 48 #endif 49