{"id":2174154,"url":"http://patchwork.ozlabs.org/api/patches/2174154/?format=json","web_url":"http://patchwork.ozlabs.org/project/qemu-devel/patch/20251215075747.2367-1-wafer@jaguarmicro.com/","project":{"id":14,"url":"http://patchwork.ozlabs.org/api/projects/14/?format=json","name":"QEMU Development","link_name":"qemu-devel","list_id":"qemu-devel.nongnu.org","list_email":"qemu-devel@nongnu.org","web_url":"","scm_url":"","webscm_url":"","list_archive_url":"","list_archive_url_format":"","commit_url_format":""},"msgid":"<20251215075747.2367-1-wafer@jaguarmicro.com>","list_archive_url":null,"date":"2025-12-15T07:57:47","name":"[v2,3/4] vhost: SVQ get the indirect descriptors from used 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SVQ","version":2,"mbox":"http://patchwork.ozlabs.org/series/485358/mbox/"}],"comments":"http://patchwork.ozlabs.org/api/patches/2174154/comments/","check":"pending","checks":"http://patchwork.ozlabs.org/api/patches/2174154/checks/","tags":{},"related":[],"headers":{"Return-Path":"","X-Original-To":"incoming@patchwork.ozlabs.org","Delivered-To":"patchwork-incoming@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=jaguarmicro.com header.i=@jaguarmicro.com\n header.a=rsa-sha256 header.s=selector2 header.b=Hqj7C8nD;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=nongnu.org\n (client-ip=209.51.188.17; helo=lists.gnu.org;\n envelope-from=qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org;\n receiver=patchwork.ozlabs.org)","dkim=none (message not signed)\n header.d=none;dmarc=none action=none header.from=jaguarmicro.com;"],"Received":["from lists.gnu.org (lists.gnu.org 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SPF_PASS=-0.001 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":",\n ","List-Archive":"","List-Post":"","List-Help":"","List-Subscribe":",\n ","Errors-To":"qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org","Sender":"qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org"},"content":"From: wafer Xie \n\nFor the used ring, based on the state of the SVQ descriptor,\nif it is indirect, retrieve the corresponding indirect buffer by index\nand then increment the freeing counter.\nOnce all descriptors in this buffer have been released,\nupdate the current buffer state to SVQ_INDIRECT_BUF_FREED.\n\nSigned-off-by: wafer Xie \n---\n hw/virtio/vhost-shadow-virtqueue.c | 43 +++++++++++++++++++++++++++---\n 1 file changed, 39 insertions(+), 4 deletions(-)","diff":"diff --git a/hw/virtio/vhost-shadow-virtqueue.c b/hw/virtio/vhost-shadow-virtqueue.c\nindex 85eff1d841..9d43f13842 100644\n--- a/hw/virtio/vhost-shadow-virtqueue.c\n+++ b/hw/virtio/vhost-shadow-virtqueue.c\n@@ -469,12 +469,47 @@ static VirtQueueElement *vhost_svq_get_buf(VhostShadowVirtqueue *svq,\n return NULL;\n }\n \n+ /* Check if indirect descriptors were used */\n+ int indirect_buf_idx = svq->desc_state[used_elem.id].indirect_buf_idx;\n+ bool used_indirect = (indirect_buf_idx >= 0);\n+\n+ /* Update indirect buffer state if it was used */\n+ if (used_indirect) {\n+ SVQIndirectDescBuf *buf = &svq->indirect_bufs[indirect_buf_idx];\n+ unsigned int ndescs = svq->desc_state[used_elem.id].ndescs;\n+\n+ /* Increment freeing_descs for descriptors returned from used ring */\n+ buf->freeing_descs += ndescs;\n+\n+ /* Check if all descriptors are accounted for (freed + freeing == num) */\n+ if (buf->freed_descs + buf->freeing_descs >= buf->num_descs) {\n+ /* Reset buffer to freed state */\n+ buf->state = SVQ_INDIRECT_BUF_FREED;\n+ buf->freed_descs = buf->num_descs;\n+ buf->freeing_descs = 0;\n+ buf->freed_head = 0;\n+ }\n+\n+ svq->desc_state[used_elem.id].indirect_buf_idx = -1;\n+ }\n+\n num = svq->desc_state[used_elem.id].ndescs;\n svq->desc_state[used_elem.id].ndescs = 0;\n- last_used_chain = vhost_svq_last_desc_of_chain(svq, num, used_elem.id);\n- svq->desc_next[last_used_chain] = svq->free_head;\n- svq->free_head = used_elem.id;\n- svq->num_free += num;\n+\n+ /*\n+ * If using indirect descriptors, only 1 main descriptor is used.\n+ * Otherwise, we used 'num' descriptors in a chain.\n+ */\n+ if (used_indirect) {\n+ svq->desc_next[used_elem.id] = svq->free_head;\n+ svq->free_head = used_elem.id;\n+ svq->num_free += 1;\n+ } else {\n+ last_used_chain = vhost_svq_last_desc_of_chain(svq, num, used_elem.id);\n+ svq->desc_next[last_used_chain] = svq->free_head;\n+ svq->free_head = used_elem.id;\n+ svq->num_free += num;\n+ }\n \n *len = used_elem.len;\n return g_steal_pointer(&svq->desc_state[used_elem.id].elem);\n","prefixes":["v2","3/4"]}