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From a26eb02b3a49c5d1163685ba5b83b67138c09047 Mon Sep 17 00:00:00 2001
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From: =?UTF-8?q?Eugenio=20P=C3=A9rez?= <eperezma@redhat.com>
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Date: Thu, 21 Jul 2022 15:38:55 +0200
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Subject: [PATCH 17/32] vhost: add vhost_svq_push_elem
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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RH-Author: Eugenio Pérez <eperezma@redhat.com>
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RH-MergeRequest: 108: Net Control Virtqueue shadow Support
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RH-Commit: [17/27] d064b40a262f2dfdc9f648d250aa8c8020c40385 (eperezmartin/qemu-kvm)
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RH-Bugzilla: 1939363
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RH-Acked-by: Stefano Garzarella <sgarzare@redhat.com>
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RH-Acked-by: Cindy Lu <lulu@redhat.com>
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RH-Acked-by: Laurent Vivier <lvivier@redhat.com>
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Bugzilla: https://bugzilla.redhat.com/1939363
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Upstream Status: git://git.qemu.org/qemu.git
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commit 432efd144e990b6e040862de25f8f0b6a6eeb03d
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Author: Eugenio Pérez <eperezma@redhat.com>
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Date: Wed Jul 20 08:59:36 2022 +0200
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vhost: add vhost_svq_push_elem
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This function allows external SVQ users to return guest's available
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buffers.
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Signed-off-by: Eugenio Pérez <eperezma@redhat.com>
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Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
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Signed-off-by: Jason Wang <jasowang@redhat.com>
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Signed-off-by: Eugenio Pérez <eperezma@redhat.com>
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---
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hw/virtio/vhost-shadow-virtqueue.c | 16 ++++++++++++++++
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hw/virtio/vhost-shadow-virtqueue.h | 3 +++
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2 files changed, 19 insertions(+)
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diff --git a/hw/virtio/vhost-shadow-virtqueue.c b/hw/virtio/vhost-shadow-virtqueue.c
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index 4d99075e73..1ce52d5b4a 100644
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--- a/hw/virtio/vhost-shadow-virtqueue.c
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+++ b/hw/virtio/vhost-shadow-virtqueue.c
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@@ -428,6 +428,22 @@ static VirtQueueElement *vhost_svq_get_buf(VhostShadowVirtqueue *svq,
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return g_steal_pointer(&svq->desc_state[used_elem.id].elem);
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}
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+/**
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+ * Push an element to SVQ, returning it to the guest.
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+ */
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+void vhost_svq_push_elem(VhostShadowVirtqueue *svq,
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+ const VirtQueueElement *elem, uint32_t len)
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+{
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+ virtqueue_push(svq->vq, elem, len);
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+ if (svq->next_guest_avail_elem) {
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+ /*
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+ * Avail ring was full when vhost_svq_flush was called, so it's a
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+ * good moment to make more descriptors available if possible.
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+ */
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+ vhost_handle_guest_kick(svq);
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+ }
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+}
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+
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static void vhost_svq_flush(VhostShadowVirtqueue *svq,
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bool check_for_avail_queue)
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{
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diff --git a/hw/virtio/vhost-shadow-virtqueue.h b/hw/virtio/vhost-shadow-virtqueue.h
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index 5c7e7cbab6..d9fc1f1799 100644
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--- a/hw/virtio/vhost-shadow-virtqueue.h
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+++ b/hw/virtio/vhost-shadow-virtqueue.h
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@@ -84,6 +84,9 @@ typedef struct VhostShadowVirtqueue {
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bool vhost_svq_valid_features(uint64_t features, Error **errp);
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+void vhost_svq_push_elem(VhostShadowVirtqueue *svq,
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+ const VirtQueueElement *elem, uint32_t len);
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+
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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_get_vring_addr(const VhostShadowVirtqueue *svq,
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--
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2.31.1
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