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([223.233.82.156]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-1fed7fcd252sm28201655ad.285.2024.07.26.02.58.41 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 26 Jul 2024 02:58:43 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1721987924; x=1722592724; 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=sVvw9f50xTkuvlwY1MV4CHABenmr7Ci+oOmj5DJaqa4=; b=QqRBX9gTrGGM4opiVUhCh/q4cw2f4KyhfGTzdNziNkl+/5tLdscrZ76Ho1Xe8EuzVm D5zwe2VuVcwPTEFrtysW/Ic3UaD/CHWh0d5VrPQ9mV/ET4LUUjxz69RpbckXzdFrSNBK HFe5xVvQnISGPz6lzf3RiTyroO/1+6dpaJd2KsmU2V+x7qlHC6bkWUB2CyYndb9vGNRe miZ26P+lR+24hLpox+f/iUDd9uOsxu8rA/bNm6T56awU3/OrHa+l5UATt6qPc5g/nscv i5/pq0Yhv9Ku6BWgWJbJowDKtOwum19p+DrAf9zhENUQns+CG6TstptGH5oWff1PD5oA /n7g== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1721987924; x=1722592724; 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=sVvw9f50xTkuvlwY1MV4CHABenmr7Ci+oOmj5DJaqa4=; b=VSzgLZEwlk0P6jG6uvWf6VszCpAm+a5sKKB0gKaLoumT1wTGE88Es4uDRAFpFf3nE1 +o21r6CUMlC98XWwkC8UrMAvWbZC1lSgJwvkBJ8WA5RjZERF3IXyLyJrzi36swaICE7P djg+9Qc5GKHHWdlu7UzXWHTUPyjZJgZRdAhMMVss9B814Fv/fTwgjNh1FGOCyYvtLBjw vHMOnU0ZBtNMfgYp0+dTKr3bmv1H4uFKGPRomonZAqXSVXgMhHMCJK8gCK23BCLxq4Fk veV80eNQ+BuNcZ2mU5sYj9am3WMh/KVR5ZnxB9zpsiu4tEecOAyh+8uI76ge2FiaDfW9 08yw== X-Forwarded-Encrypted: i=1; AJvYcCWrl8+TJrqTDtKvTkeg/4uLfZvzbErI91YqRXrQuMGnZ8RUKmyhpTtzrOtXHVDDkO7Oo+9wgpqu1eChi5d7iDf+9dZ0+B8= X-Gm-Message-State: AOJu0YyOw6yWxvTk42AVIFfCv65dCGbbVNaGGE1iDV64EUfCsxYGh8NW m52vXMLQ7sHewv88+psNIJ1Zgtj0ps9UVg6owyg6ui7IoF0ZkCc2Z5FVSw== X-Google-Smtp-Source: AGHT+IH1TkDBtKDFvI5jcyXmLrrOcOzNDBrTCqjT4hikTpMOYVdrRYDnL/f4bshWsFb2R23VDnwiEw== X-Received: by 2002:a17:902:ec91:b0:1fd:8904:ecf6 with SMTP id d9443c01a7336-1fed9259301mr46266625ad.21.1721987924328; Fri, 26 Jul 2024 02:58:44 -0700 (PDT) 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 v2 1/3] vhost: Introduce packed vq and add buffer elements Date: Fri, 26 Jul 2024 15:28:20 +0530 Message-ID: <20240726095822.104017-2-sahilcdq@proton.me> X-Mailer: git-send-email 2.45.2 In-Reply-To: <20240726095822.104017-1-sahilcdq@proton.me> References: <20240726095822.104017-1-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::62d; envelope-from=icegambit91@gmail.com; helo=mail-pl1-x62d.google.com X-Spam_score_int: 15 X-Spam_score: 1.5 X-Spam_bar: + X-Spam_report: (1.5 / 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, RCVD_IN_SBL_CSS=3.335, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=no 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: 1721987978563116600 Content-Type: text/plain; charset="utf-8" This is the first patch 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. Signed-off-by: Sahil Siddiq --- Changes v1 -> v2: * Split commit from RFC v1 into two commits. * vhost-shadow-virtqueue.c (vhost_svq_add_packed): - Merge with "vhost_svq_vring_write_descs_packed()" - Remove "num =3D=3D 0" check hw/virtio/vhost-shadow-virtqueue.c | 93 +++++++++++++++++++++++++++++- 1 file changed, 92 insertions(+), 1 deletion(-) diff --git a/hw/virtio/vhost-shadow-virtqueue.c b/hw/virtio/vhost-shadow-vi= rtqueue.c index fc5f408f77..c7b7e0c477 100644 --- a/hw/virtio/vhost-shadow-virtqueue.c +++ b/hw/virtio/vhost-shadow-virtqueue.c @@ -217,6 +217,91 @@ static bool vhost_svq_add_split(VhostShadowVirtqueue *= svq, return true; } =20 +static bool vhost_svq_add_packed(VhostShadowVirtqueue *svq, + const struct iovec *out_sg, size_t out_num, + const struct iovec *in_sg, size_t in_num, + unsigned *head) +{ + bool ok; + uint16_t head_flags =3D 0; + g_autofree hwaddr *sgs =3D g_new(hwaddr, out_num + in_num); + + *head =3D svq->vring_packed.next_avail_idx; + + /* We need some descriptors here */ + if (unlikely(!out_num && !in_num)) { + qemu_log_mask(LOG_GUEST_ERROR, + "Guest provided element with no descriptors"); + return false; + } + + uint16_t id, curr, i; + unsigned n; + struct vring_packed_desc *descs =3D svq->vring_packed.vring.desc; + + i =3D *head; + id =3D svq->free_head; + curr =3D id; + + size_t num =3D out_num + in_num; + + ok =3D vhost_svq_translate_addr(svq, sgs, out_sg, out_num); + if (unlikely(!ok)) { + return false; + } + + ok =3D vhost_svq_translate_addr(svq, sgs + out_num, in_sg, in_num); + if (unlikely(!ok)) { + return false; + } + + /* 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; + + return true; +} + static void vhost_svq_kick(VhostShadowVirtqueue *svq) { bool needs_kick; @@ -258,7 +343,13 @@ int vhost_svq_add(VhostShadowVirtqueue *svq, const str= uct iovec *out_sg, return -ENOSPC; } =20 - ok =3D vhost_svq_add_split(svq, out_sg, out_num, in_sg, in_num, &qemu_= head); + if (virtio_vdev_has_feature(svq->vdev, VIRTIO_F_RING_PACKED)) { + ok =3D vhost_svq_add_packed(svq, out_sg, out_num, + in_sg, in_num, &qemu_head); + } else { + ok =3D vhost_svq_add_split(svq, out_sg, out_num, + in_sg, in_num, &qemu_head); + } if (unlikely(!ok)) { return -EINVAL; } --=20 2.45.2