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Tue, 09 Feb 2021 14:04:37 -0500 Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-490-poSY6VNJMXi4pe0pfFs2GQ-1; Tue, 09 Feb 2021 14:04:32 -0500 Received: from smtp.corp.redhat.com (int-mx02.intmail.prod.int.phx2.redhat.com [10.5.11.12]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 8F08D79EC7 for ; Tue, 9 Feb 2021 19:04:31 +0000 (UTC) Received: from dgilbert-t580.localhost (ovpn-112-66.ams2.redhat.com [10.36.112.66]) by smtp.corp.redhat.com (Postfix) with ESMTP id EE7D860C04; Tue, 9 Feb 2021 19:04:26 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1612897474; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=q2BHuaHwyAeHruEDsZi0dteCYPsHDGR868zs0c/yNDs=; b=XTlFaaybKN/5aP/xjcHZs6X52mmx6noB0ded8Pwvi1WNKN6dSdU1uZFcgbaSyds7+r0Ccy kxVkUpd9CMcvrYbmcrDfXSo25/ur/3FE8vajTceD4dL1/dr1qZfQ880jxgfgASIWljc8PQ HNdeZrnip+0fw1IbEpsVNc3ZpN5o3/w= X-MC-Unique: poSY6VNJMXi4pe0pfFs2GQ-1 From: "Dr. David Alan Gilbert (git)" To: qemu-devel@nongnu.org, vgoyal@redhat.com, stefanha@redhat.com, virtio-fs@redhat.com, marcandre.lureau@redhat.com, mst@redhat.com Subject: [PATCH 08/24] DAX: virtio-fs: Fill in slave commands for mapping Date: Tue, 9 Feb 2021 19:02:08 +0000 Message-Id: <20210209190224.62827-9-dgilbert@redhat.com> In-Reply-To: <20210209190224.62827-1-dgilbert@redhat.com> References: <20210209190224.62827-1-dgilbert@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.12 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=dgilbert@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com 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=63.128.21.124; envelope-from=dgilbert@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -33 X-Spam_score: -3.4 X-Spam_bar: --- X-Spam_report: (-3.4 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.57, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H4=0.001, RCVD_IN_MSPIKE_WL=0.001, 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: 2.1.23 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) Content-Type: text/plain; charset="utf-8" From: "Dr. David Alan Gilbert" Fill in definitions for map, unmap and sync commands. Signed-off-by: Dr. David Alan Gilbert with fix by misono.tomohiro@fujitsu.com --- hw/virtio/vhost-user-fs.c | 115 ++++++++++++++++++++++++++++++++++++-- 1 file changed, 111 insertions(+), 4 deletions(-) diff --git a/hw/virtio/vhost-user-fs.c b/hw/virtio/vhost-user-fs.c index 78401d2ff1..5f2fca4d82 100644 --- a/hw/virtio/vhost-user-fs.c +++ b/hw/virtio/vhost-user-fs.c @@ -37,15 +37,122 @@ uint64_t vhost_user_fs_slave_map(struct vhost_dev *dev, VhostUserFSSlaveMs= g *sm, int fd) { - /* TODO */ - return (uint64_t)-1; + VHostUserFS *fs =3D VHOST_USER_FS(dev->vdev); + if (!fs) { + /* Shouldn't happen - but seen on error path */ + error_report("Bad fs ptr"); + return (uint64_t)-1; + } + size_t cache_size =3D fs->conf.cache_size; + if (!cache_size) { + error_report("map called when DAX cache not present"); + return (uint64_t)-1; + } + void *cache_host =3D memory_region_get_ram_ptr(&fs->cache); + + unsigned int i; + int res =3D 0; + + if (fd < 0) { + error_report("Bad fd for map"); + return (uint64_t)-1; + } + + for (i =3D 0; i < VHOST_USER_FS_SLAVE_ENTRIES; i++) { + if (sm->len[i] =3D=3D 0) { + continue; + } + + if ((sm->c_offset[i] + sm->len[i]) < sm->len[i] || + (sm->c_offset[i] + sm->len[i]) > cache_size) { + error_report("Bad offset/len for map [%d] %" PRIx64 "+%" PRIx6= 4, + i, sm->c_offset[i], sm->len[i]); + res =3D -1; + break; + } + + if (mmap(cache_host + sm->c_offset[i], sm->len[i], + ((sm->flags[i] & VHOST_USER_FS_FLAG_MAP_R) ? PROT_READ : = 0) | + ((sm->flags[i] & VHOST_USER_FS_FLAG_MAP_W) ? PROT_WRITE := 0), + MAP_SHARED | MAP_FIXED, + fd, sm->fd_offset[i]) !=3D (cache_host + sm->c_offset[i])= ) { + res =3D -errno; + error_report("map failed err %d [%d] %" PRIx64 "+%" PRIx64 " f= rom %" + PRIx64, errno, i, sm->c_offset[i], sm->len[i], + sm->fd_offset[i]); + break; + } + } + + if (res) { + /* Something went wrong, unmap them all */ + vhost_user_fs_slave_unmap(dev, sm); + } + return (uint64_t)res; } =20 uint64_t vhost_user_fs_slave_unmap(struct vhost_dev *dev, VhostUserFSSlaveMsg *sm) { - /* TODO */ - return (uint64_t)-1; + VHostUserFS *fs =3D VHOST_USER_FS(dev->vdev); + if (!fs) { + /* Shouldn't happen - but seen on error path */ + error_report("Bad fs ptr"); + return (uint64_t)-1; + } + size_t cache_size =3D fs->conf.cache_size; + if (!cache_size) { + /* + * Since dax cache is disabled, there should be no unmap request. + * Howerver we still receives whole range unmap request during umo= unt + * for cleanup. Ignore it. + */ + if (sm->len[0] =3D=3D ~(uint64_t)0) { + return 0; + } + + error_report("unmap called when DAX cache not present"); + return (uint64_t)-1; + } + void *cache_host =3D memory_region_get_ram_ptr(&fs->cache); + + unsigned int i; + int res =3D 0; + + /* + * Note even if one unmap fails we try the rest, since the effect + * is to clean up as much as possible. + */ + for (i =3D 0; i < VHOST_USER_FS_SLAVE_ENTRIES; i++) { + void *ptr; + if (sm->len[i] =3D=3D 0) { + continue; + } + + if (sm->len[i] =3D=3D ~(uint64_t)0) { + /* Special case meaning the whole arena */ + sm->len[i] =3D cache_size; + } + + if ((sm->c_offset[i] + sm->len[i]) < sm->len[i] || + (sm->c_offset[i] + sm->len[i]) > cache_size) { + error_report("Bad offset/len for unmap [%d] %" PRIx64 "+%" PRI= x64, + i, sm->c_offset[i], sm->len[i]); + res =3D -1; + continue; + } + + ptr =3D mmap(cache_host + sm->c_offset[i], sm->len[i], DAX_WINDOW_= PROT, + MAP_PRIVATE | MAP_ANONYMOUS | MAP_FIXED, -1, 0); + if (ptr !=3D (cache_host + sm->c_offset[i])) { + res =3D -errno; + error_report("mmap failed (%s) [%d] %" PRIx64 "+%" PRIx64 " fr= om %" + PRIx64 " res: %p", strerror(errno), i, sm->c_offs= et[i], + sm->len[i], sm->fd_offset[i], ptr); + } + } + + return (uint64_t)res; } =20 static void vuf_get_config(VirtIODevice *vdev, uint8_t *config) --=20 2.29.2