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Tsirkin" , Cindy Lu , Cornelia Huck , Liuxiangdong , Jason Wang , Stefan Hajnoczi , "Gonglei (Arei)" , Gautam Dawar Subject: [RFC PATCH 06/12] vhost: Use opaque data in SVQDescState Date: Sat, 16 Jul 2022 13:34:01 +0200 Message-Id: <20220716113407.2730331-7-eperezma@redhat.com> In-Reply-To: <20220716113407.2730331-1-eperezma@redhat.com> References: <20220716113407.2730331-1-eperezma@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable X-Scanned-By: MIMEDefang 2.84 on 10.11.54.2 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: 1657971524957100001 Since we'll allow net/vhost-vdpa to add elements that don't come from the guest, we need to store opaque data that makes sense to the caller. Signed-off-by: Eugenio P=C3=A9rez --- hw/virtio/vhost-shadow-virtqueue.h | 4 ++-- hw/virtio/vhost-shadow-virtqueue.c | 20 +++++++++++--------- 2 files changed, 13 insertions(+), 11 deletions(-) diff --git a/hw/virtio/vhost-shadow-virtqueue.h b/hw/virtio/vhost-shadow-vi= rtqueue.h index d04c34a589..03eb7ff670 100644 --- a/hw/virtio/vhost-shadow-virtqueue.h +++ b/hw/virtio/vhost-shadow-virtqueue.h @@ -16,7 +16,7 @@ #include "hw/virtio/vhost-iova-tree.h" =20 typedef struct SVQDescState { - VirtQueueElement *elem; + void *data; =20 /* * Number of descriptors exposed to the device. May or may not match @@ -115,7 +115,7 @@ void vhost_svq_push_elem(VhostShadowVirtqueue *svq, const VirtQueueElement *elem, uint32_t len); int vhost_svq_add(VhostShadowVirtqueue *svq, const struct iovec *out_sg, size_t out_num, const struct iovec *in_sg, size_t in_num, - VirtQueueElement *elem); + void *data); size_t vhost_svq_poll(VhostShadowVirtqueue *svq); =20 void vhost_svq_set_svq_kick_fd(VhostShadowVirtqueue *svq, int svq_kick_fd); diff --git a/hw/virtio/vhost-shadow-virtqueue.c b/hw/virtio/vhost-shadow-vi= rtqueue.c index 29633b7a29..88e290d94b 100644 --- a/hw/virtio/vhost-shadow-virtqueue.c +++ b/hw/virtio/vhost-shadow-virtqueue.c @@ -237,7 +237,7 @@ static void vhost_svq_kick(VhostShadowVirtqueue *svq) */ int vhost_svq_add(VhostShadowVirtqueue *svq, const struct iovec *out_sg, size_t out_num, const struct iovec *in_sg, size_t in_num, - VirtQueueElement *elem) + void *data) { unsigned qemu_head; unsigned ndescs =3D in_num + out_num; @@ -252,7 +252,7 @@ int vhost_svq_add(VhostShadowVirtqueue *svq, const stru= ct iovec *out_sg, return -EINVAL; } =20 - svq->desc_state[qemu_head].elem =3D elem; + svq->desc_state[qemu_head].data =3D data; svq->desc_state[qemu_head].ndescs =3D ndescs; vhost_svq_kick(svq); return 0; @@ -389,8 +389,7 @@ static uint16_t vhost_svq_last_desc_of_chain(const Vhos= tShadowVirtqueue *svq, return i; } =20 -static VirtQueueElement *vhost_svq_get_buf(VhostShadowVirtqueue *svq, - uint32_t *len) +static void *vhost_svq_get_buf(VhostShadowVirtqueue *svq, uint32_t *len) { const vring_used_t *used =3D svq->vring.used; vring_used_elem_t used_elem; @@ -413,7 +412,7 @@ static VirtQueueElement *vhost_svq_get_buf(VhostShadowV= irtqueue *svq, return NULL; } =20 - if (unlikely(!svq->desc_state[used_elem.id].elem)) { + if (unlikely(!svq->desc_state[used_elem.id].data)) { qemu_log_mask(LOG_GUEST_ERROR, "Device %s says index %u is used, but it was not available", svq->vdev->name, used_elem.id); @@ -426,7 +425,7 @@ static VirtQueueElement *vhost_svq_get_buf(VhostShadowV= irtqueue *svq, svq->free_head =3D used_elem.id; =20 *len =3D used_elem.len; - return g_steal_pointer(&svq->desc_state[used_elem.id].elem); + return g_steal_pointer(&svq->desc_state[used_elem.id].data); } =20 /** @@ -498,8 +497,7 @@ size_t vhost_svq_poll(VhostShadowVirtqueue *svq) { do { uint32_t len; - VirtQueueElement *elem =3D vhost_svq_get_buf(svq, &len); - if (elem) { + if (vhost_svq_get_buf(svq, &len)) { return len; } =20 @@ -658,8 +656,12 @@ void vhost_svq_stop(VhostShadowVirtqueue *svq) vhost_svq_flush(svq, false); =20 for (unsigned i =3D 0; i < svq->vring.num; ++i) { + /* + * We know .data is an element because external callers of + * vhost_svq_add use active polling, not SVQ + */ g_autofree VirtQueueElement *elem =3D NULL; - elem =3D g_steal_pointer(&svq->desc_state[i].elem); + elem =3D g_steal_pointer(&svq->desc_state[i].data); if (elem) { virtqueue_detach_element(svq->vq, elem, 0); } --=20 2.31.1