4725a4181b
This allows SVQ to negotiate features with the guest and the device. For the device, SVQ is a driver. While this function bypasses all non-transport features, it needs to disable the features that SVQ does not support when forwarding buffers. This includes packed vq layout, indirect descriptors or event idx. Future changes can add support to offer more features to the guest, since the use of VirtQueue gives this for free. This is left out at the moment for simplicity. Signed-off-by: Eugenio Pérez <eperezma@redhat.com> Acked-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Jason Wang <jasowang@redhat.com>
49 lines
1.4 KiB
C
49 lines
1.4 KiB
C
/*
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* vhost shadow virtqueue
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*
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* SPDX-FileCopyrightText: Red Hat, Inc. 2021
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* SPDX-FileContributor: Author: Eugenio Pérez <eperezma@redhat.com>
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*
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* SPDX-License-Identifier: GPL-2.0-or-later
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*/
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#ifndef VHOST_SHADOW_VIRTQUEUE_H
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#define VHOST_SHADOW_VIRTQUEUE_H
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#include "qemu/event_notifier.h"
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/* Shadow virtqueue to relay notifications */
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typedef struct VhostShadowVirtqueue {
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/* Shadow kick notifier, sent to vhost */
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EventNotifier hdev_kick;
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/* Shadow call notifier, sent to vhost */
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EventNotifier hdev_call;
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/*
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* Borrowed virtqueue's guest to host notifier. To borrow it in this event
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* notifier allows to recover the VhostShadowVirtqueue from the event loop
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* easily. If we use the VirtQueue's one, we don't have an easy way to
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* retrieve VhostShadowVirtqueue.
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*
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* So shadow virtqueue must not clean it, or we would lose VirtQueue one.
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*/
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EventNotifier svq_kick;
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/* Guest's call notifier, where the SVQ calls guest. */
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EventNotifier svq_call;
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} VhostShadowVirtqueue;
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bool vhost_svq_valid_features(uint64_t features, Error **errp);
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void vhost_svq_set_svq_kick_fd(VhostShadowVirtqueue *svq, int svq_kick_fd);
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void vhost_svq_set_svq_call_fd(VhostShadowVirtqueue *svq, int call_fd);
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void vhost_svq_stop(VhostShadowVirtqueue *svq);
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VhostShadowVirtqueue *vhost_svq_new(void);
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void vhost_svq_free(gpointer vq);
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G_DEFINE_AUTOPTR_CLEANUP_FUNC(VhostShadowVirtqueue, vhost_svq_free);
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#endif
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