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Tsirkin" , Stefano Garzarella , Eric Blake , Zhu Lingshan , Stefan Hajnoczi , Markus Armbruster , Cornelia Huck , Parav Pandit , Laurent Vivier , Liuxiangdong , Eli Cohen , Cindy Lu , Harpreet Singh Anand , Jason Wang , "Gonglei (Arei)" Subject: [PATCH v2 09/19] vhost: Track number of descs in SVQElement Date: Thu, 14 Jul 2022 18:31:40 +0200 Message-Id: <20220714163150.2536327-10-eperezma@redhat.com> In-Reply-To: <20220714163150.2536327-1-eperezma@redhat.com> References: <20220714163150.2536327-1-eperezma@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable X-Scanned-By: MIMEDefang 2.78 on 10.11.54.3 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=170.10.129.124; envelope-from=eperezma@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -28 X-Spam_score: -2.9 X-Spam_bar: -- X-Spam_report: (-2.9 / 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_LOW=-0.7, 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: 1657816955842100001 Since CVQ will be able to modify elements, the number of descriptors in the guest may not match with the number of descriptors exposed. Track separately. Signed-off-by: Eugenio P=C3=A9rez --- hw/virtio/vhost-shadow-virtqueue.h | 6 ++++++ hw/virtio/vhost-shadow-virtqueue.c | 10 +++++----- 2 files changed, 11 insertions(+), 5 deletions(-) diff --git a/hw/virtio/vhost-shadow-virtqueue.h b/hw/virtio/vhost-shadow-vi= rtqueue.h index f35d4b8f90..143c86a568 100644 --- a/hw/virtio/vhost-shadow-virtqueue.h +++ b/hw/virtio/vhost-shadow-virtqueue.h @@ -17,6 +17,12 @@ =20 typedef struct SVQElement { VirtQueueElement elem; + + /* + * Number of descriptors exposed to the device. May or may not match + * guest's + */ + unsigned int ndescs; } SVQElement; =20 /* Shadow virtqueue to relay notifications */ diff --git a/hw/virtio/vhost-shadow-virtqueue.c b/hw/virtio/vhost-shadow-vi= rtqueue.c index 442ca3cbd3..3b112c4ec8 100644 --- a/hw/virtio/vhost-shadow-virtqueue.c +++ b/hw/virtio/vhost-shadow-virtqueue.c @@ -243,10 +243,10 @@ static int vhost_svq_add(VhostShadowVirtqueue *svq, c= onst struct iovec *out_sg, size_t in_num, SVQElement *svq_elem) { unsigned qemu_head; - unsigned ndescs =3D in_num + out_num; + svq_elem->ndescs =3D in_num + out_num; bool ok; =20 - if (unlikely(ndescs > vhost_svq_available_slots(svq))) { + if (unlikely(svq_elem->ndescs > vhost_svq_available_slots(svq))) { return -ENOSPC; } =20 @@ -393,7 +393,7 @@ static SVQElement *vhost_svq_get_buf(VhostShadowVirtque= ue *svq, SVQElement *elem; const vring_used_t *used =3D svq->vring.used; vring_used_elem_t used_elem; - uint16_t last_used, last_used_chain, num; + uint16_t last_used, last_used_chain; =20 if (!vhost_svq_more_used(svq)) { return NULL; @@ -420,8 +420,8 @@ static SVQElement *vhost_svq_get_buf(VhostShadowVirtque= ue *svq, } =20 elem =3D svq->ring_id_maps[used_elem.id]; - num =3D elem->elem.in_num + elem->elem.out_num; - last_used_chain =3D vhost_svq_last_desc_of_chain(svq, num, used_elem.i= d); + last_used_chain =3D vhost_svq_last_desc_of_chain(svq, elem->ndescs, + used_elem.id); svq->desc_next[last_used_chain] =3D svq->free_head; svq->free_head =3D used_elem.id; =20 --=20 2.31.1