From nobody Fri Dec 19 22:02:55 2025 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=pass(p=none dis=none) header.from=gmail.com ARC-Seal: i=1; a=rsa-sha256; t=1733430944; cv=none; d=zohomail.com; s=zohoarc; b=esXwMiNPi7IpGflpZfHFmM+F8lNnHD90rs25YpnV7OgZS4EpJ48NnrfXh3rUHEibn+oS7tWgl4bi9q6QjpZ09a49Wz7i9+xH1ZnjWknqIXR4C0GNMHqTR12DufwoJmsyN0jyDHd4dIyxYbh8UNyYzuKpOnFXzwlzmrAvQbZyVaM= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1733430944; h=Content-Transfer-Encoding:Cc:Cc:Date:Date:From:From:In-Reply-To:List-Subscribe:List-Post:List-Id:List-Archive:List-Help:List-Unsubscribe:MIME-Version:Message-ID:References:Sender:Subject:Subject:To:To:Message-Id:Reply-To; bh=Ho7yg6U067P5Xh/RW+CDVPYnTIMYuQPRqRvfGLa5b6g=; b=AryK0rN+YRQ5S8P/jJo3sYZ+T/4FzrgGFpYXhBRq86ilKe7lDyW+7AXcAGzs/GNZHOB1TmBT7WlTfgbuOD54zIMs3PuhAeyi4/k6b0OLsQtHeHwMpoS4VWeSf8uGA0wEiVAeTC2O6R6QJfj+hFXRCGRcHl79QMvFBFYfX7L+Co4= ARC-Authentication-Results: i=1; mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=pass header.from= (p=none dis=none) Return-Path: Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) by mx.zohomail.com with SMTPS id 1733430944227163.20257848746917; Thu, 5 Dec 2024 12:35:44 -0800 (PST) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1tJIZ2-0005yV-2C; Thu, 05 Dec 2024 15:35:08 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1tJIZ0-0005wI-Fa for qemu-devel@nongnu.org; Thu, 05 Dec 2024 15:35:06 -0500 Received: from mail-pf1-x432.google.com ([2607:f8b0:4864:20::432]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1tJIYy-0004lR-Mu for qemu-devel@nongnu.org; Thu, 05 Dec 2024 15:35:06 -0500 Received: by mail-pf1-x432.google.com with SMTP id d2e1a72fcca58-724e14b90cfso1435625b3a.2 for ; Thu, 05 Dec 2024 12:35:04 -0800 (PST) Received: from valdaarhun.. ([2409:4081:2c01:b2be:f39d:e902:7582:5526]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-2ef2701c2f2sm3705905a91.23.2024.12.05.12.35.00 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 05 Dec 2024 12:35:02 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1733430903; x=1734035703; darn=nongnu.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=Ho7yg6U067P5Xh/RW+CDVPYnTIMYuQPRqRvfGLa5b6g=; b=fS1RHPzJW2Aj30eyjd9HqMIMaAIzRtx85+qPClw27ZS3adaHN8xbW+SDVvTE2cU+9d R3eJwxvjyy8IQ60KqxJaS9aMckzzjT6LN19NZSTZCaBFjT00D2JHw8VuRSkoFmNLaW9x Nh0mpom9J5y6NMnbaqYO0OA72YCJ1Vh0k2oAPkUUImPaFLjyN6jcWPRcTx0PvWmLffr2 wk69iqY3uMi0FxVYmpStiZed0nH1RV2KXIKyiVJF/jcGmpY6u5SIuconpScbn117YTK7 6rUa5QwHLlOVONgRvDTAH6dUb9Xcz5OKqTRPtA8VNM7xk9xYji5ENmwF8b7VYT5ecYB1 D2MA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1733430903; x=1734035703; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=Ho7yg6U067P5Xh/RW+CDVPYnTIMYuQPRqRvfGLa5b6g=; b=MgZel8Xm1E0CRsupaEXtrV8iBjTCPywyUXhCdYTWT+wX6+xCChIt43wV4m/Stjg/cq pTQJDOAIl7vtzTDOhvqbpAshk4SaDquJE6GeWoSwLBi/BRxZkaYhPv2T1Tlyep0guj2n WsJcFqrE9HVNcf6+xVbmQPWYaEk5AthHI9tTkayQU6qI/Wq/JS3Glbe/WDboQ1/Qy/Rt FnfCbmZRLjruQuqXgsV0hwELJJCs8Jbgmn/qoRe5SAoYYr6aEcUzjOPjNDQuUstD+tAI WbvKwDCdeUPVCPVkN/9bCd7KS4l7iOhn44olvxUCHoqQQyH6tQmGzxwWBs97+JB3TP6E wA6Q== X-Forwarded-Encrypted: i=1; AJvYcCXBkyQhFYz9jjcb4erMlNdQH7x0zoAOr7VLEAS5L/NdK76cVcREFCU4sKUj5UdHpUXGFWXRibD68w/2@nongnu.org X-Gm-Message-State: AOJu0YygcAsHt46ADDB6gc8A2I+kFZVDhruDRI6CVrgfIncWEiMgB1T7 Xov5YDqk9kQ6jGsUHBTTlC2rQvkHOKs7QkNuc4purvKgSxJELFKkr+vywQ== X-Gm-Gg: ASbGncug0+ah91KuwDo0hacUtwyFUSv9H3jdvOOZmbFJSWmEIAfNNAZx7MspFp23OF7 g4CcvM2QEu0arwIqX5p0/rTTiQjsQzSBHSENPDAs0CbN/0M7mlV17Kx0DxLuDu8qopUxqEIfAdg X3yJYUUyASTOVLGwTVeZUSKurE3AYTU2eiaHghacTLpoqROr2ICcyrO0s0grqcWAV0qcYdWdM4P +fCU98EVGhLiYJrBT4IRXZiA/rL6/LjSX2n/024s0M= X-Google-Smtp-Source: AGHT+IGaKFkcjrLMfwjlj0++LPVUS7WZYp/D4x5NUBgasLDoRn7VkRiUrUONm/NEj+C0Eu6hcrkL8A== X-Received: by 2002:a17:90b:5384:b0:2ee:dcf6:1c8f with SMTP id 98e67ed59e1d1-2ef69f0b7f8mr812652a91.16.1733430903260; Thu, 05 Dec 2024 12:35:03 -0800 (PST) From: Sahil Siddiq X-Google-Original-From: Sahil Siddiq To: eperezma@redhat.com, sgarzare@redhat.com Cc: mst@redhat.com, qemu-devel@nongnu.org, Sahil Siddiq Subject: [RFC v4 2/5] vhost: Write descriptors to packed svq Date: Fri, 6 Dec 2024 02:04:27 +0530 Message-ID: <20241205203430.76251-3-sahilcdq@proton.me> X-Mailer: git-send-email 2.47.0 In-Reply-To: <20241205203430.76251-1-sahilcdq@proton.me> References: <20241205203430.76251-1-sahilcdq@proton.me> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable 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=2607:f8b0:4864:20::432; envelope-from=icegambit91@gmail.com; helo=mail-pf1-x432.google.com X-Spam_score_int: -17 X-Spam_score: -1.8 X-Spam_bar: - X-Spam_report: (-1.8 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_ENVFROM_END_DIGIT=0.25, FREEMAIL_FROM=0.001, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, 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: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @gmail.com) X-ZM-MESSAGEID: 1733430946145116600 Content-Type: text/plain; charset="utf-8" This commit is the first in a series to add support for packed virtqueues in vhost_shadow_virtqueue. This patch implements the insertion of available buffers in the descriptor area. It takes into account descriptor chains, but does not consider indirect descriptors. Also validate svq-specific features that vdpa supports. Signed-off-by: Sahil Siddiq --- Changes v3 -> v4: - Split commit #1 in v3 into 2 commits. - vhost-shadow-virtqueue.c (vhost_svq_valid_features): Add enums. hw/virtio/vhost-shadow-virtqueue.c | 83 +++++++++++++++++++++++++++++- 1 file changed, 81 insertions(+), 2 deletions(-) diff --git a/hw/virtio/vhost-shadow-virtqueue.c b/hw/virtio/vhost-shadow-vi= rtqueue.c index bb7cf6d5db..6eee01ab3c 100644 --- a/hw/virtio/vhost-shadow-virtqueue.c +++ b/hw/virtio/vhost-shadow-virtqueue.c @@ -33,6 +33,9 @@ bool vhost_svq_valid_features(uint64_t features, Error **= errp) ++b) { switch (b) { case VIRTIO_F_ANY_LAYOUT: + case VIRTIO_F_RING_PACKED: + case VIRTIO_F_RING_RESET: + case VIRTIO_RING_F_INDIRECT_DESC: case VIRTIO_RING_F_EVENT_IDX: continue; =20 @@ -178,7 +181,78 @@ static void vhost_svq_add_split(VhostShadowVirtqueue *= svq, /* Update the avail index after write the descriptor */ smp_wmb(); avail->idx =3D cpu_to_le16(svq->shadow_avail_idx); +} =20 +/** + * Write descriptors to SVQ packed vring + * + * @svq: The shadow virtqueue + * @out_sg: The iovec to the guest + * @out_num: Outgoing iovec length + * @in_sg: The iovec from the guest + * @in_num: Incoming iovec length + * @sgs: Cache for hwaddr + * @head: Saves current free_head + */ +static void vhost_svq_add_packed(VhostShadowVirtqueue *svq, + const struct iovec *out_sg, size_t out_num, + const struct iovec *in_sg, size_t in_num, + hwaddr *sgs, unsigned *head) +{ + uint16_t id, curr, i, head_flags =3D 0; + size_t num =3D out_num + in_num; + unsigned n; + + struct vring_packed_desc *descs =3D svq->vring_packed.vring.desc; + + *head =3D svq->vring_packed.next_avail_idx; + i =3D *head; + id =3D svq->free_head; + curr =3D id; + + /* Write descriptors to SVQ packed vring */ + for (n =3D 0; n < num; n++) { + uint16_t flags =3D cpu_to_le16(svq->vring_packed.avail_used_flags | + (n < out_num ? 0 : VRING_DESC_F_WRITE= ) | + (n + 1 =3D=3D num ? 0 : VRING_DESC_F_= NEXT)); + if (i =3D=3D *head) { + head_flags =3D flags; + } else { + descs[i].flags =3D flags; + } + + descs[i].addr =3D cpu_to_le64(sgs[n]); + descs[i].id =3D id; + if (n < out_num) { + descs[i].len =3D cpu_to_le32(out_sg[n].iov_len); + } else { + descs[i].len =3D cpu_to_le32(in_sg[n - out_num].iov_len); + } + + curr =3D cpu_to_le16(svq->desc_next[curr]); + + if (++i >=3D svq->vring_packed.vring.num) { + i =3D 0; + svq->vring_packed.avail_used_flags ^=3D + 1 << VRING_PACKED_DESC_F_AVAIL | + 1 << VRING_PACKED_DESC_F_USED; + } + } + + if (i <=3D *head) { + svq->vring_packed.avail_wrap_counter ^=3D 1; + } + + svq->vring_packed.next_avail_idx =3D i; + svq->free_head =3D curr; + + /* + * A driver MUST NOT make the first descriptor in the list + * available before all subsequent descriptors comprising + * the list are made available. + */ + smp_wmb(); + svq->vring_packed.vring.desc[*head].flags =3D head_flags; } =20 static void vhost_svq_kick(VhostShadowVirtqueue *svq) @@ -240,8 +314,13 @@ int vhost_svq_add(VhostShadowVirtqueue *svq, const str= uct iovec *out_sg, return -EINVAL; } =20 - vhost_svq_add_split(svq, out_sg, out_num, in_sg, - in_num, sgs, &qemu_head); + if (virtio_vdev_has_feature(svq->vdev, VIRTIO_F_RING_PACKED)) { + vhost_svq_add_packed(svq, out_sg, out_num, in_sg, + in_num, sgs, &qemu_head); + } else { + vhost_svq_add_split(svq, out_sg, out_num, in_sg, + in_num, sgs, &qemu_head); + } =20 svq->num_free -=3D ndescs; svq->desc_state[qemu_head].elem =3D elem; --=20 2.47.0