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Wed, 28 Apr 2021 07:01:56 -0400 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-477-9LmE-bY5NYCbW9nFE0yt-A-1; Wed, 28 Apr 2021 07:01:49 -0400 Received: from smtp.corp.redhat.com (int-mx07.intmail.prod.int.phx2.redhat.com [10.5.11.22]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 7D40D80B71B; Wed, 28 Apr 2021 11:01:48 +0000 (UTC) Received: from dgilbert-t580.localhost (ovpn-115-35.ams2.redhat.com [10.36.115.35]) by smtp.corp.redhat.com (Postfix) with ESMTP id CFF1610190A7; Wed, 28 Apr 2021 11:01:39 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1619607711; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=Ljfo4oko6rykN3ZDh9ZJHLBPXCNPDpGtckcWAS6rmbk=; b=C422kcKOq42eDt0zqW8NNJdz+Bz8CnV17TijMz/6Lr9DhxXzIsXWRQ0TQX+BuE1kR4/5p6 BMFj+ztZhxufw7GAtncq5LBiXYZi/d0SQLXk/1ZjcZRCb4rH/30XMzlyxpwhCGD7ewFgN8 xyHerBA509K7omYgeR9Up9b4KY7PspY= X-MC-Unique: 9LmE-bY5NYCbW9nFE0yt-A-1 From: "Dr. David Alan Gilbert (git)" To: qemu-devel@nongnu.org, vgoyal@redhat.com, stefanha@redhat.com, groug@kaod.org Subject: [PATCH v3 10/26] DAX: virtio-fs: Fill in slave commands for mapping Date: Wed, 28 Apr 2021 12:00:44 +0100 Message-Id: <20210428110100.27757-11-dgilbert@redhat.com> In-Reply-To: <20210428110100.27757-1-dgilbert@redhat.com> References: <20210428110100.27757-1-dgilbert@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.84 on 10.5.11.22 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=216.205.24.124; envelope-from=dgilbert@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -29 X-Spam_score: -3.0 X-Spam_bar: --- X-Spam_report: (-3.0 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.22, 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: , Cc: virtio-fs@redhat.com 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 Reviewed-by: Stefan Hajnoczi --- hw/virtio/vhost-user-fs.c | 117 ++++++++++++++++++++++++++++++++++++-- 1 file changed, 113 insertions(+), 4 deletions(-) diff --git a/hw/virtio/vhost-user-fs.c b/hw/virtio/vhost-user-fs.c index 169a146e72..963f694435 100644 --- a/hw/virtio/vhost-user-fs.c +++ b/hw/virtio/vhost-user-fs.c @@ -92,23 +92,132 @@ static bool check_slave_message_entries(const VhostUse= rFSSlaveMsg *sm, uint64_t vhost_user_fs_slave_map(struct vhost_dev *dev, int message_size, VhostUserFSSlaveMsg *sm, int fd) { + VHostUserFS *fs =3D (VHostUserFS *)object_dynamic_cast(OBJECT(dev->vde= v), + TYPE_VHOST_USER_FS); + if (!fs) { + error_report("%s: Bad fs ptr", __func__); + return (uint64_t)-1; + } if (!check_slave_message_entries(sm, message_size)) { return (uint64_t)-1; } =20 - /* TODO */ - 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 < sm->count; i++) { + VhostUserFSSlaveMsgEntry *e =3D &sm->entries[i]; + if (e->len =3D=3D 0) { + continue; + } + + if ((e->c_offset + e->len) < e->len || + (e->c_offset + e->len) > cache_size) { + error_report("Bad offset/len for map [%d] %" PRIx64 "+%" PRIx6= 4, + i, e->c_offset, e->len); + res =3D -1; + break; + } + + if (mmap(cache_host + e->c_offset, e->len, + ((e->flags & VHOST_USER_FS_FLAG_MAP_R) ? PROT_READ : 0) | + ((e->flags & VHOST_USER_FS_FLAG_MAP_W) ? PROT_WRITE : 0), + MAP_SHARED | MAP_FIXED, + fd, e->fd_offset) !=3D (cache_host + e->c_offset)) { + res =3D -errno; + error_report("map failed err %d [%d] %" PRIx64 "+%" PRIx64 " f= rom %" + PRIx64, errno, i, e->c_offset, e->len, + e->fd_offset); + break; + } + } + + if (res) { + /* Something went wrong, unmap them all */ + vhost_user_fs_slave_unmap(dev, message_size, sm); + } + return (uint64_t)res; } =20 uint64_t vhost_user_fs_slave_unmap(struct vhost_dev *dev, int message_size, VhostUserFSSlaveMsg *sm) { + VHostUserFS *fs =3D (VHostUserFS *)object_dynamic_cast(OBJECT(dev->vde= v), + TYPE_VHOST_USER_FS); + if (!fs) { + error_report("%s: Bad fs ptr", __func__); + return (uint64_t)-1; + } if (!check_slave_message_entries(sm, message_size)) { return (uint64_t)-1; } =20 - /* TODO */ - 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->entries[0].len =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 < sm->count; i++) { + VhostUserFSSlaveMsgEntry *e =3D &sm->entries[i]; + void *ptr; + if (e->len =3D=3D 0) { + continue; + } + + if (e->len =3D=3D ~(uint64_t)0) { + /* Special case meaning the whole arena */ + e->len =3D cache_size; + } + + if ((e->c_offset + e->len) < e->len || + (e->c_offset + e->len) > cache_size) { + error_report("Bad offset/len for unmap [%d] %" PRIx64 "+%" PRI= x64, + i, e->c_offset, e->len); + res =3D -1; + continue; + } + + ptr =3D mmap(cache_host + e->c_offset, e->len, DAX_WINDOW_PROT, + MAP_PRIVATE | MAP_ANONYMOUS | MAP_FIXED, -1, 0); + if (ptr !=3D (cache_host + e->c_offset)) { + res =3D -errno; + error_report("mmap failed (%s) [%d] %" PRIx64 "+%" PRIx64 " fr= om %" + PRIx64 " res: %p", strerror(errno), i, e->c_offse= t, + e->len, e->fd_offset, ptr); + } + } + + return (uint64_t)res; } =20 static void vuf_get_config(VirtIODevice *vdev, uint8_t *config) --=20 2.31.1