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Tsirkin" , Cindy Lu , Jason Wang Subject: [RFC PATCH v9 01/23] vhost: Return earlier if used buffers overrun Date: Wed, 6 Jul 2022 20:39:46 +0200 Message-Id: <20220706184008.1649478-2-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=170.10.129.124; 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: 1657133252846100001 Previous function misses the just picked avail buffer from the queue. This way keeps blocking the used queue forever, but is cleaner to check before calling to vhost_svq_get_buf. Fixes: 100890f7cad50 ("vhost: Shadow virtqueue buffers forwarding") Signed-off-by: Eugenio P=C3=A9rez Acked-by: Jason Wang --- hw/virtio/vhost-shadow-virtqueue.c | 14 ++++++++------ 1 file changed, 8 insertions(+), 6 deletions(-) diff --git a/hw/virtio/vhost-shadow-virtqueue.c b/hw/virtio/vhost-shadow-vi= rtqueue.c index 56c96ebd13..9280285435 100644 --- a/hw/virtio/vhost-shadow-virtqueue.c +++ b/hw/virtio/vhost-shadow-virtqueue.c @@ -405,19 +405,21 @@ static void vhost_svq_flush(VhostShadowVirtqueue *svq, vhost_svq_disable_notification(svq); while (true) { uint32_t len; - g_autofree VirtQueueElement *elem =3D vhost_svq_get_buf(svq, &= len); - if (!elem) { - break; - } + g_autofree VirtQueueElement *elem =3D NULL; =20 if (unlikely(i >=3D svq->vring.num)) { qemu_log_mask(LOG_GUEST_ERROR, "More than %u used buffers obtained in a %u size = SVQ", i, svq->vring.num); - virtqueue_fill(vq, elem, len, i); - virtqueue_flush(vq, i); + virtqueue_flush(vq, svq->vring.num); return; } + + elem =3D vhost_svq_get_buf(svq, &len); + if (!elem) { + break; + } + virtqueue_fill(vq, elem, len, i++); } =20 --=20 2.31.1