From patchwork Fri May 22 17:17:23 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Stefan Hajnoczi X-Patchwork-Id: 11566019 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 0A8F914C0 for ; Fri, 22 May 2020 17:18:48 +0000 (UTC) Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id C675D20756 for ; Fri, 22 May 2020 17:18:47 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="HebC2I2R" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org C675D20756 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=redhat.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Received: from localhost ([::1]:48588 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1jcBJn-0006bk-1c for patchwork-qemu-devel@patchwork.kernel.org; Fri, 22 May 2020 13:18:47 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:46760) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1jcBJ7-0004vK-Gr for qemu-devel@nongnu.org; Fri, 22 May 2020 13:18:05 -0400 Received: from us-smtp-delivery-1.mimecast.com ([205.139.110.120]:25929 helo=us-smtp-1.mimecast.com) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_CBC_SHA1:256) (Exim 4.90_1) (envelope-from ) id 1jcBJ5-0000di-Rx for qemu-devel@nongnu.org; Fri, 22 May 2020 13:18:05 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1590167882; 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=4+WAH92SNYw1I0R63EWnB7Xfs3BvI/uefRj3o3pNaD4=; b=HebC2I2RIRSnxw1p6c0NJenk4de/+VQEO4GhZi1rbpx45h20xSeHIuPyIlMwoY1rQbKhOq tdAcWWT5J/A6oz1hkjjCQONV9M5wFntk2roeda7PAKG89Jc3+frKUuz60513GOWEhScmzm 2AVtHDPhNBRQpGV//NTd0NAIGGSSIoI= 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-288-6S4Dbln-OWaN1Tqzn83lHQ-1; Fri, 22 May 2020 13:17:57 -0400 X-MC-Unique: 6S4Dbln-OWaN1Tqzn83lHQ-1 Received: from smtp.corp.redhat.com (int-mx04.intmail.prod.int.phx2.redhat.com [10.5.11.14]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 7191480058A; Fri, 22 May 2020 17:17:56 +0000 (UTC) Received: from localhost (ovpn-112-243.ams2.redhat.com [10.36.112.243]) by smtp.corp.redhat.com (Postfix) with ESMTP id 965F55D9CC; Fri, 22 May 2020 17:17:55 +0000 (UTC) From: Stefan Hajnoczi To: qemu-devel@nongnu.org Subject: [PATCH 2/5] vhost: involve device backends in feature negotiation Date: Fri, 22 May 2020 18:17:23 +0100 Message-Id: <20200522171726.648279-3-stefanha@redhat.com> In-Reply-To: <20200522171726.648279-1-stefanha@redhat.com> References: <20200522171726.648279-1-stefanha@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.14 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Received-SPF: pass client-ip=205.139.110.120; envelope-from=stefanha@redhat.com; helo=us-smtp-1.mimecast.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/05/22 10:36:44 X-ACL-Warn: Detected OS = Linux 2.2.x-3.x [generic] [fuzzy] X-Spam_score_int: -3 X-Spam_score: -0.4 X-Spam_bar: / X-Spam_report: (-0.4 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, MIME_BASE64_TEXT=1.741, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H4=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_PASS=-0.001 autolearn=_AUTOLEARN 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: Kevin Wolf , Laurent Vivier , Thomas Huth , Eduardo Habkost , qemu-block@nongnu.org, "Michael S. Tsirkin" , jasowang@redhat.com, cohuck@redhat.com, Stefan Hajnoczi , "Dr. David Alan Gilbert" , Raphael Norwitz , "Gonglei \(Arei\)" , Gerd Hoffmann , Paolo Bonzini , =?utf-8?q?Marc-Andr=C3=A9_Lureau?= , Fam Zheng , Max Reitz Errors-To: qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Sender: "Qemu-devel" Many vhost devices in QEMU currently do not involve the device backend in feature negotiation. This seems fine at first glance for device types without their own feature bits (virtio-net has many but other device types have none). This overlooks the fact that QEMU's virtqueue implementation and the device backend's implementation may support different features. QEMU must not report features to the guest that the the device backend doesn't support. For example, QEMU supports VIRTIO 1.1 packed virtqueues while many existing vhost device backends do not. When the user sets packed=on the device backend breaks. This should have been handled gracefully by feature negotiation instead. Introduce vhost_get_default_features() and update all vhost devices in QEMU to involve the device backend in feature negotiation. This patch fixes the following error: $ x86_64-softmmu/qemu-system-x86_64 \ -drive if=virtio,file=test.img,format=raw \ -chardev socket,path=/tmp/vhost-user-blk.sock,id=char0 \ -device vhost-user-blk-pci,chardev=char0,packed=on \ -object memory-backend-memfd,size=1G,share=on,id=ram0 \ -M accel=kvm,memory-backend=ram0 qemu-system-x86_64: Failed to set msg fds. qemu-system-x86_64: vhost VQ 0 ring restore failed: -1: Success (0) The vhost-user-blk backend failed as follows: $ ./vhost-user-blk --socket-path=/tmp/vhost-user-blk.sock -b test2.img vu_panic: virtio: zero sized buffers are not allowed virtio-blk request missing headers Signed-off-by: Stefan Hajnoczi --- include/hw/virtio/vhost.h | 1 + include/hw/virtio/virtio-gpu.h | 2 ++ include/sysemu/cryptodev-vhost.h | 11 +++++++++++ backends/cryptodev-vhost.c | 19 +++++++++++++++++++ hw/display/vhost-user-gpu.c | 17 +++++++++++++++++ hw/display/virtio-gpu-base.c | 2 +- hw/input/vhost-user-input.c | 9 +++++++++ hw/virtio/vhost-user-fs.c | 5 +++-- hw/virtio/vhost-vsock.c | 5 +++-- hw/virtio/vhost.c | 22 ++++++++++++++++++++++ hw/virtio/virtio-crypto.c | 3 ++- 11 files changed, 90 insertions(+), 6 deletions(-) diff --git a/include/hw/virtio/vhost.h b/include/hw/virtio/vhost.h index 085450c6f8..d2e54dd4a8 100644 --- a/include/hw/virtio/vhost.h +++ b/include/hw/virtio/vhost.h @@ -112,6 +112,7 @@ void vhost_virtqueue_mask(struct vhost_dev *hdev, VirtIODevice *vdev, int n, bool mask); uint64_t vhost_get_features(struct vhost_dev *hdev, const int *feature_bits, uint64_t features); +uint64_t vhost_get_default_features(struct vhost_dev *hdev, uint64_t features); void vhost_ack_features(struct vhost_dev *hdev, const int *feature_bits, uint64_t features); bool vhost_has_free_slot(void); diff --git a/include/hw/virtio/virtio-gpu.h b/include/hw/virtio/virtio-gpu.h index 6dd57f2025..41d270d80e 100644 --- a/include/hw/virtio/virtio-gpu.h +++ b/include/hw/virtio/virtio-gpu.h @@ -192,6 +192,8 @@ bool virtio_gpu_base_device_realize(DeviceState *qdev, void virtio_gpu_base_reset(VirtIOGPUBase *g); void virtio_gpu_base_fill_display_info(VirtIOGPUBase *g, struct virtio_gpu_resp_display_info *dpy_info); +uint64_t virtio_gpu_base_get_features(VirtIODevice *vdev, uint64_t features, + Error **errp); /* virtio-gpu.c */ void virtio_gpu_ctrl_response(VirtIOGPU *g, diff --git a/include/sysemu/cryptodev-vhost.h b/include/sysemu/cryptodev-vhost.h index f42824fbde..e629446bfb 100644 --- a/include/sysemu/cryptodev-vhost.h +++ b/include/sysemu/cryptodev-vhost.h @@ -122,6 +122,17 @@ int cryptodev_vhost_start(VirtIODevice *dev, int total_queues); */ void cryptodev_vhost_stop(VirtIODevice *dev, int total_queues); +/** + * cryptodev_vhost_get_features: + * @dev: the virtio crypto object + * @requested_features: the features being offered + * + * Returns: the requested features bits that are supported by the vhost device, + * or the original request feature bits if vhost is disabled + * + */ +uint64_t cryptodev_vhost_get_features(VirtIODevice *dev, uint64_t features); + /** * cryptodev_vhost_virtqueue_mask: * @dev: the virtio crypto object diff --git a/backends/cryptodev-vhost.c b/backends/cryptodev-vhost.c index 8337c9a495..5f5a4fda7b 100644 --- a/backends/cryptodev-vhost.c +++ b/backends/cryptodev-vhost.c @@ -266,6 +266,20 @@ void cryptodev_vhost_stop(VirtIODevice *dev, int total_queues) assert(r >= 0); } +uint64_t cryptodev_vhost_get_features(VirtIODevice *dev, uint64_t features) +{ + VirtIOCrypto *vcrypto = VIRTIO_CRYPTO(dev); + CryptoDevBackend *b = vcrypto->cryptodev; + CryptoDevBackendClient *cc = b->conf.peers.ccs[0]; + CryptoDevBackendVhost *vhost_crypto = cryptodev_get_vhost(cc, b, 0); + + if (!vhost_crypto) { + return features; /* vhost disabled */ + } + + return vhost_get_default_features(&vhost_crypto->dev, features); +} + void cryptodev_vhost_virtqueue_mask(VirtIODevice *dev, int queue, int idx, bool mask) @@ -333,6 +347,11 @@ void cryptodev_vhost_stop(VirtIODevice *dev, int total_queues) { } +uint64_t cryptodev_vhost_get_features(VirtIODevice *dev, uint64_t features) +{ + return features; +} + void cryptodev_vhost_virtqueue_mask(VirtIODevice *dev, int queue, int idx, bool mask) diff --git a/hw/display/vhost-user-gpu.c b/hw/display/vhost-user-gpu.c index 4cdaee1bde..e483df2a9e 100644 --- a/hw/display/vhost-user-gpu.c +++ b/hw/display/vhost-user-gpu.c @@ -466,6 +466,22 @@ vhost_user_gpu_set_config(VirtIODevice *vdev, } } +static uint64_t +vhost_user_gpu_get_features(VirtIODevice *vdev, uint64_t features, + Error **errp) +{ + VhostUserGPU *g = VHOST_USER_GPU(vdev); + Error *local_err = NULL; + + features = virtio_gpu_base_get_features(vdev, features, &local_err); + if (local_err) { + error_propagate(errp, local_err); + return 0; + } + + return vhost_get_default_features(&g->vhost->dev, features); +} + static void vhost_user_gpu_set_status(VirtIODevice *vdev, uint8_t val) { @@ -582,6 +598,7 @@ vhost_user_gpu_class_init(ObjectClass *klass, void *data) vdc->realize = vhost_user_gpu_device_realize; vdc->reset = vhost_user_gpu_reset; + vdc->get_features = vhost_user_gpu_get_features; vdc->set_status = vhost_user_gpu_set_status; vdc->guest_notifier_mask = vhost_user_gpu_guest_notifier_mask; vdc->guest_notifier_pending = vhost_user_gpu_guest_notifier_pending; diff --git a/hw/display/virtio-gpu-base.c b/hw/display/virtio-gpu-base.c index c159351be3..05d1ff2db2 100644 --- a/hw/display/virtio-gpu-base.c +++ b/hw/display/virtio-gpu-base.c @@ -176,7 +176,7 @@ virtio_gpu_base_device_realize(DeviceState *qdev, return true; } -static uint64_t +uint64_t virtio_gpu_base_get_features(VirtIODevice *vdev, uint64_t features, Error **errp) { diff --git a/hw/input/vhost-user-input.c b/hw/input/vhost-user-input.c index 63984a8ba7..1371fb32cc 100644 --- a/hw/input/vhost-user-input.c +++ b/hw/input/vhost-user-input.c @@ -45,6 +45,14 @@ static void vhost_input_change_active(VirtIOInput *vinput) } } +static uint64_t vhost_input_get_features(VirtIODevice *vdev, uint64_t features, + Error **errp) +{ + VHostUserInput *vhi = VHOST_USER_INPUT(vdev); + + return vhost_get_default_features(&vhi->vhost->dev, features); +} + static void vhost_input_get_config(VirtIODevice *vdev, uint8_t *config_data) { VirtIOInput *vinput = VIRTIO_INPUT(vdev); @@ -89,6 +97,7 @@ static void vhost_input_class_init(ObjectClass *klass, void *data) DeviceClass *dc = DEVICE_CLASS(klass); dc->vmsd = &vmstate_vhost_input; + vdc->get_features = vhost_input_get_features; vdc->get_config = vhost_input_get_config; vdc->set_config = vhost_input_set_config; vic->realize = vhost_input_realize; diff --git a/hw/virtio/vhost-user-fs.c b/hw/virtio/vhost-user-fs.c index 1bc5d03a00..56015ca3d4 100644 --- a/hw/virtio/vhost-user-fs.c +++ b/hw/virtio/vhost-user-fs.c @@ -130,8 +130,9 @@ static uint64_t vuf_get_features(VirtIODevice *vdev, uint64_t requested_features, Error **errp) { - /* No feature bits used yet */ - return requested_features; + VHostUserFS *fs = VHOST_USER_FS(vdev); + + return vhost_get_default_features(&fs->vhost_dev, requested_features); } static void vuf_handle_output(VirtIODevice *vdev, VirtQueue *vq) diff --git a/hw/virtio/vhost-vsock.c b/hw/virtio/vhost-vsock.c index 4a228f5168..7276587be6 100644 --- a/hw/virtio/vhost-vsock.c +++ b/hw/virtio/vhost-vsock.c @@ -180,8 +180,9 @@ static uint64_t vhost_vsock_get_features(VirtIODevice *vdev, uint64_t requested_features, Error **errp) { - /* No feature bits used yet */ - return requested_features; + VHostVSock *vsock = VHOST_VSOCK(vdev); + + return vhost_get_default_features(&vsock->vhost_dev, requested_features); } static void vhost_vsock_handle_output(VirtIODevice *vdev, VirtQueue *vq) diff --git a/hw/virtio/vhost.c b/hw/virtio/vhost.c index aff98a0ede..f8a144dcd0 100644 --- a/hw/virtio/vhost.c +++ b/hw/virtio/vhost.c @@ -48,6 +48,23 @@ static unsigned int used_memslots; static QLIST_HEAD(, vhost_dev) vhost_devices = QLIST_HEAD_INITIALIZER(vhost_devices); +/* + * Feature bits that device backends must explicitly report. Feature bits not + * listed here maybe set by QEMU without checking with the device backend. + * Ideally all feature bits would be listed here but existing vhost device + * implementations do not explicitly report bits like VIRTIO_F_VERSION_1, so we + * can only assume they are supported. + * + * New feature bits added to the VIRTIO spec should usually be included here + * so that existing vhost device backends that do not support them yet continue + * to work. + */ +static const int vhost_default_feature_bits[] = { + VIRTIO_F_IOMMU_PLATFORM, + VIRTIO_F_RING_PACKED, + VHOST_INVALID_FEATURE_BIT +}; + bool vhost_has_free_slot(void) { unsigned int slots_limit = ~0U; @@ -1468,6 +1485,11 @@ uint64_t vhost_get_features(struct vhost_dev *hdev, const int *feature_bits, return features; } +uint64_t vhost_get_default_features(struct vhost_dev *hdev, uint64_t features) +{ + return vhost_get_features(hdev, vhost_default_feature_bits, features); +} + void vhost_ack_features(struct vhost_dev *hdev, const int *feature_bits, uint64_t features) { diff --git a/hw/virtio/virtio-crypto.c b/hw/virtio/virtio-crypto.c index bd9165c565..ef711b56f4 100644 --- a/hw/virtio/virtio-crypto.c +++ b/hw/virtio/virtio-crypto.c @@ -739,7 +739,8 @@ static uint64_t virtio_crypto_get_features(VirtIODevice *vdev, uint64_t features, Error **errp) { - return features; + /* Just returns features when vhost is disabled */ + return cryptodev_vhost_get_features(vdev, features); } static void virtio_crypto_reset(VirtIODevice *vdev)