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Tsirkin" , Cindy Lu , Jason Wang Subject: [RFC PATCH v9 13/23] vhost: Add vhost_svq_inject Date: Wed, 6 Jul 2022 20:39:58 +0200 Message-Id: <20220706184008.1649478-14-eperezma@redhat.com> In-Reply-To: <20220706184008.1649478-1-eperezma@redhat.com> References: <20220706184008.1649478-1-eperezma@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable X-Scanned-By: MIMEDefang 2.85 on 10.11.54.7 Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=170.10.133.124; envelope-from=eperezma@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -21 X-Spam_score: -2.2 X-Spam_bar: -- X-Spam_report: (-2.2 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.082, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: pass (identity @redhat.com) X-ZM-MESSAGEID: 1657133417883100001 This allows qemu to inject buffers to the device. Signed-off-by: Eugenio P=C3=A9rez --- hw/virtio/vhost-shadow-virtqueue.h | 2 ++ hw/virtio/vhost-shadow-virtqueue.c | 34 ++++++++++++++++++++++++++++++ 2 files changed, 36 insertions(+) diff --git a/hw/virtio/vhost-shadow-virtqueue.h b/hw/virtio/vhost-shadow-vi= rtqueue.h index a811f90e01..d01d2370db 100644 --- a/hw/virtio/vhost-shadow-virtqueue.h +++ b/hw/virtio/vhost-shadow-virtqueue.h @@ -98,6 +98,8 @@ bool vhost_svq_valid_features(uint64_t features, Error **= errp); =20 void vhost_svq_push_elem(VhostShadowVirtqueue *svq, const VirtQueueElement *elem, uint32_t len); +int vhost_svq_inject(VhostShadowVirtqueue *svq, const struct iovec *iov, + size_t out_num, size_t in_num, void *opaque); void vhost_svq_set_svq_kick_fd(VhostShadowVirtqueue *svq, int svq_kick_fd); void vhost_svq_set_svq_call_fd(VhostShadowVirtqueue *svq, int call_fd); void vhost_svq_get_vring_addr(const VhostShadowVirtqueue *svq, diff --git a/hw/virtio/vhost-shadow-virtqueue.c b/hw/virtio/vhost-shadow-vi= rtqueue.c index 492bb12b5f..bd9e34b413 100644 --- a/hw/virtio/vhost-shadow-virtqueue.c +++ b/hw/virtio/vhost-shadow-virtqueue.c @@ -283,6 +283,40 @@ static bool vhost_svq_add_element(VhostShadowVirtqueue= *svq, return ok; } =20 +/** + * Inject a chain of buffers to the device + * + * @svq: Shadow VirtQueue + * @iov: I/O vector + * @out_num: Number of front out descriptors + * @in_num: Number of last input descriptors + * @opaque: Contextual data to store in descriptor + * + * Return 0 on success, -ENOMEM if cannot inject + */ +int vhost_svq_inject(VhostShadowVirtqueue *svq, const struct iovec *iov, + size_t out_num, size_t in_num, void *opaque) +{ + bool ok; + + /* + * All vhost_svq_inject calls are controlled by qemu so we won't hit t= his + * assertions. + */ + assert(out_num || in_num); + assert(svq->ops); + + if (unlikely(svq->next_guest_avail_elem)) { + error_report("Injecting in a full queue"); + return -ENOMEM; + } + + ok =3D vhost_svq_add(svq, iov, out_num, iov + out_num, in_num, opaque); + assert(ok); + vhost_svq_kick(svq); + return 0; +} + /** * Forward available buffers. * --=20 2.31.1