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Mon, 17 Mar 2025 23:51:48 GMT Received: from pps.reinject (localhost [127.0.0.1]) by phxpaimrmta02.imrmtpd1.prodappphxaev1.oraclevcn.com (PPS) with ESMTPS id 45dxeekf9a-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Mon, 17 Mar 2025 23:51:48 +0000 Received: from phxpaimrmta02.imrmtpd1.prodappphxaev1.oraclevcn.com (phxpaimrmta02.imrmtpd1.prodappphxaev1.oraclevcn.com [127.0.0.1]) by pps.reinject (8.17.1.5/8.17.1.5) with ESMTP id 52HNpi2n016519; Mon, 17 Mar 2025 23:51:47 GMT Received: from localhost.localdomain (ca-dev80.us.oracle.com [10.211.9.80]) by phxpaimrmta02.imrmtpd1.prodappphxaev1.oraclevcn.com (PPS) with ESMTP id 45dxeekf68-5; Mon, 17 Mar 2025 23:51:47 +0000 From: Dongli Zhang To: virtualization@lists.linux.dev, kvm@vger.kernel.org, netdev@vger.kernel.org Cc: mst@redhat.com, jasowang@redhat.com, michael.christie@oracle.com, pbonzini@redhat.com, stefanha@redhat.com, eperezma@redhat.com, joao.m.martins@oracle.com, joe.jin@oracle.com, si-wei.liu@oracle.com, linux-kernel@vger.kernel.org Subject: [PATCH v2 04/10] vhost: modify vhost_log_write() for broader users Date: Mon, 17 Mar 2025 16:55:12 -0700 Message-ID: <20250317235546.4546-5-dongli.zhang@oracle.com> X-Mailer: git-send-email 2.43.5 In-Reply-To: <20250317235546.4546-1-dongli.zhang@oracle.com> References: <20250317235546.4546-1-dongli.zhang@oracle.com> Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1093,Hydra:6.0.680,FMLib:17.12.68.34 definitions=2025-03-17_10,2025-03-17_03,2024-11-22_01 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 bulkscore=0 phishscore=0 mlxscore=0 adultscore=0 mlxlogscore=981 spamscore=0 malwarescore=0 suspectscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2502280000 definitions=main-2503170173 X-Proofpoint-GUID: JuWQprw7Op6UhA4vIqhU_DL2z1_HuuCx X-Proofpoint-ORIG-GUID: JuWQprw7Op6UhA4vIqhU_DL2z1_HuuCx Currently, the only user of vhost_log_write() is vhost-net. The 'len' argument prevents logging of pages that are not tainted by the RX path. Adjustments are needed since more drivers (i.e. vhost-scsi) begin using vhost_log_write(). So far vhost-net RX path may only partially use pages shared by the last vring descriptor. Unlike vhost-net, vhost-scsi always logs all pages shared via vring descriptors. To accommodate this, a new argument 'partial' is introduced. This argument works alongside 'len' to indicate whether the driver should log all pages of a vring descriptor, or only pages that are tainted by the driver. In addition, removes BUG(). Suggested-by: Joao Martins Signed-off-by: Dongli Zhang --- drivers/vhost/net.c | 2 +- drivers/vhost/vhost.c | 28 +++++++++++++++++----------- drivers/vhost/vhost.h | 2 +- 3 files changed, 19 insertions(+), 13 deletions(-) diff --git a/drivers/vhost/net.c b/drivers/vhost/net.c index b9b9e9d40951..0e5d82bfde76 100644 --- a/drivers/vhost/net.c +++ b/drivers/vhost/net.c @@ -1219,7 +1219,7 @@ static void handle_rx(struct vhost_net *net) if (nvq->done_idx > VHOST_NET_BATCH) vhost_net_signal_used(nvq); if (unlikely(vq_log)) - vhost_log_write(vq, vq_log, log, vhost_len, + vhost_log_write(vq, vq_log, log, vhost_len, true, vq->iov, in); total_len += vhost_len; } while (likely(!vhost_exceeds_weight(vq, ++recv_pkts, total_len))); diff --git a/drivers/vhost/vhost.c b/drivers/vhost/vhost.c index 9ac25d08f473..db3b30aba940 100644 --- a/drivers/vhost/vhost.c +++ b/drivers/vhost/vhost.c @@ -2304,8 +2304,14 @@ static int log_used(struct vhost_virtqueue *vq, u64 used_offset, u64 len) return 0; } -int vhost_log_write(struct vhost_virtqueue *vq, struct vhost_log *log, - unsigned int log_num, u64 len, struct iovec *iov, int count) +/* + * 'len' is used only when 'partial' is true, to indicate whether the + * entire length of each descriptor is logged. + */ +int vhost_log_write(struct vhost_virtqueue *vq, + struct vhost_log *log, unsigned int log_num, + u64 len, bool partial, + struct iovec *iov, int count) { int i, r; @@ -2323,19 +2329,19 @@ int vhost_log_write(struct vhost_virtqueue *vq, struct vhost_log *log, } for (i = 0; i < log_num; ++i) { - u64 l = min(log[i].len, len); + u64 l = partial ? min(log[i].len, len) : log[i].len; + r = log_write(vq->log_base, log[i].addr, l); if (r < 0) return r; - len -= l; - if (!len) { - if (vq->log_ctx) - eventfd_signal(vq->log_ctx); - return 0; - } + + if (partial) + len -= l; } - /* Length written exceeds what we have stored. This is a bug. */ - BUG(); + + if (vq->log_ctx) + eventfd_signal(vq->log_ctx); + return 0; } EXPORT_SYMBOL_GPL(vhost_log_write); diff --git a/drivers/vhost/vhost.h b/drivers/vhost/vhost.h index bb75a292d50c..5de5941988fe 100644 --- a/drivers/vhost/vhost.h +++ b/drivers/vhost/vhost.h @@ -224,7 +224,7 @@ bool vhost_vq_avail_empty(struct vhost_dev *, struct vhost_virtqueue *); bool vhost_enable_notify(struct vhost_dev *, struct vhost_virtqueue *); int vhost_log_write(struct vhost_virtqueue *vq, struct vhost_log *log, - unsigned int log_num, u64 len, + unsigned int log_num, u64 len, bool partial, struct iovec *iov, int count); int vq_meta_prefetch(struct vhost_virtqueue *vq);