From patchwork Mon Apr 20 10:41:44 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Laurent Vivier X-Patchwork-Id: 11498579 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 E901014DD for ; Mon, 20 Apr 2020 10:45:14 +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 BE56F205C9 for ; Mon, 20 Apr 2020 10:45:14 +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="KBahea8o" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org BE56F205C9 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]:33160 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1jQTvN-0007yf-Sk for patchwork-qemu-devel@patchwork.kernel.org; Mon, 20 Apr 2020 06:45:13 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:58212 helo=eggs1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1jQTuC-0006Fz-1h for qemu-devel@nongnu.org; Mon, 20 Apr 2020 06:44:00 -0400 Received: from Debian-exim by eggs1p.gnu.org with spam-scanned (Exim 4.90_1) (envelope-from ) id 1jQTuB-0007A3-AW for qemu-devel@nongnu.org; Mon, 20 Apr 2020 06:43:59 -0400 Received: from us-smtp-delivery-1.mimecast.com ([205.139.110.120]:49025 helo=us-smtp-1.mimecast.com) by eggs1p.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_CBC_SHA1:256) (Exim 4.90_1) (envelope-from ) id 1jQTuA-00078n-SX for qemu-devel@nongnu.org; Mon, 20 Apr 2020 06:43:58 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1587379438; 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=68zcpC9k81t800nLNJDYA9V3jbLASwP5qT+sd5lfxSI=; b=KBahea8oH1Saa5Q6Cg9fA2u97UBGvMjC6tCgE2HBl9OoRsBTKnVATQ6Sj+G6i40PKmuxtA Rmuayo5/CzneKhxdU30lZeGaFCo8qF8yuJGbr+WJjNjgyyayjKPNjuYaBnASgQruAjxHyV mZLAewSDpjisjX4Z+Ezs3CX+nTveuvU= 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-280-wGhhSnn5N3eu_PEBznCHsw-1; Mon, 20 Apr 2020 06:43:54 -0400 X-MC-Unique: wGhhSnn5N3eu_PEBznCHsw-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 87F8C18CA240; Mon, 20 Apr 2020 10:43:53 +0000 (UTC) Received: from thinkpad.redhat.com (ovpn-114-254.ams2.redhat.com [10.36.114.254]) by smtp.corp.redhat.com (Postfix) with ESMTP id CD9455DA76; Mon, 20 Apr 2020 10:43:32 +0000 (UTC) From: Laurent Vivier To: qemu-devel@nongnu.org Subject: [RFC v2 5/6] qmp: add QMP command virtio-queue-element Date: Mon, 20 Apr 2020 12:41:44 +0200 Message-Id: <20200420104145.205297-6-lvivier@redhat.com> In-Reply-To: <20200420104145.205297-1-lvivier@redhat.com> References: <20200420104145.205297-1-lvivier@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=lvivier@redhat.com; helo=us-smtp-1.mimecast.com X-detected-operating-system: by eggs1p.gnu.org: First seen = 2020/04/20 04:32:42 X-ACL-Warn: Detected OS = Linux 2.2.x-3.x [generic] X-Received-From: 205.139.110.120 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: Laurent Vivier , Fam Zheng , Thomas Huth , qemu-block@nongnu.org, Amit Shah , Markus Armbruster , Jason Wang , "Michael S. Tsirkin" , David Hildenbrand , Michael Roth , Max Reitz , Eric Auger , Gerd Hoffmann , Stefan Hajnoczi , =?utf-8?q?Marc-Andr=C3=A9_Lureau?= , Paolo Bonzini , Kevin Wolf , "Dr. David Alan Gilbert" Errors-To: qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Sender: "Qemu-devel" This new command shows the information of a VirtQueue element. Signed-off-by: Laurent Vivier --- Notes: v2: don't check if the queue is empty to allow to display old elements use enum for desc flags manage indirect desc hw/virtio/virtio-stub.c | 7 +++ hw/virtio/virtio.c | 128 ++++++++++++++++++++++++++++++++++++++++ qapi/virtio.json | 94 +++++++++++++++++++++++++++++ 3 files changed, 229 insertions(+) diff --git a/hw/virtio/virtio-stub.c b/hw/virtio/virtio-stub.c index 5b4ed6fd531e..693f5eac409f 100644 --- a/hw/virtio/virtio-stub.c +++ b/hw/virtio/virtio-stub.c @@ -23,3 +23,10 @@ VirtQueueStatus *qmp_virtio_queue_status(const char *path, uint16_t queue, { return qmp_virtio_unsupported(errp); } + +VirtioQueueElement *qmp_virtio_queue_element(const char* path, uint16_t queue, + bool has_index, uint16_t index, + Error **errp) +{ + return qmp_virtio_unsupported(errp); +} diff --git a/hw/virtio/virtio.c b/hw/virtio/virtio.c index dd0b57fb9441..cb2d6c605372 100644 --- a/hw/virtio/virtio.c +++ b/hw/virtio/virtio.c @@ -4033,6 +4033,134 @@ VirtioStatus *qmp_virtio_status(const char* path, Error **errp) return status; } +static VirtioRingDescFlagsList *qmp_decode_vring_desc_flags(uint16_t flags) +{ + VirtioRingDescFlagsList *list = NULL; + VirtioRingDescFlagsList *node; + int i; + struct { + uint16_t flag; + VirtioRingDescFlags value; + } map[] = { + { VRING_DESC_F_NEXT, VIRTIO_RING_DESC_FLAGS_NEXT }, + { VRING_DESC_F_WRITE, VIRTIO_RING_DESC_FLAGS_WRITE }, + { VRING_DESC_F_INDIRECT, VIRTIO_RING_DESC_FLAGS_INDIRECT }, + { 1 << VRING_PACKED_DESC_F_AVAIL, VIRTIO_RING_DESC_FLAGS_AVAIL }, + { 1 << VRING_PACKED_DESC_F_USED, VIRTIO_RING_DESC_FLAGS_USED }, + { 0, -1 } + }; + + for (i = 0; map[i].flag; i++) { + if ((map[i].flag & flags) == 0) { + continue; + } + node = g_malloc0(sizeof(VirtioRingDescFlagsList)); + node->value = map[i].value; + node->next = list; + list = node; + } + + return list; +} + +VirtioQueueElement *qmp_virtio_queue_element(const char* path, uint16_t queue, + bool has_index, uint16_t index, + Error **errp) +{ + VirtIODevice *vdev; + VirtQueue *vq; + VirtioQueueElement *element = NULL; + + vdev = virtio_device_find(path); + if (vdev == NULL) { + error_setg(errp, "Path %s is not a VirtIO device", path); + return NULL; + } + + if (queue >= VIRTIO_QUEUE_MAX || !virtio_queue_get_num(vdev, queue)) { + error_setg(errp, "Invalid virtqueue number %d", queue); + return NULL; + } + vq = &vdev->vq[queue]; + + if (virtio_vdev_has_feature(vdev, VIRTIO_F_RING_PACKED)) { + error_setg(errp, "Packed ring not supported"); + return NULL; + } else { + unsigned int head, i, max; + VRingMemoryRegionCaches *caches; + MemoryRegionCache indirect_desc_cache = MEMORY_REGION_CACHE_INVALID; + MemoryRegionCache *desc_cache; + VRingDesc desc; + VirtioRingDescList *list = NULL; + VirtioRingDescList *node; + int rc; + + RCU_READ_LOCK_GUARD(); + + max = vq->vring.num; + + if (!has_index) { + head = vring_avail_ring(vq, vq->last_avail_idx % vq->vring.num); + } else { + head = vring_avail_ring(vq, index % vq->vring.num); + } + i = head; + + caches = vring_get_region_caches(vq); + if (!caches) { + error_setg(errp, "Region caches not initialized"); + return NULL; + } + + if (caches->desc.len < max * sizeof(VRingDesc)) { + error_setg(errp, "Cannot map descriptor ring"); + return NULL; + } + + desc_cache = &caches->desc; + vring_split_desc_read(vdev, &desc, desc_cache, i); + if (desc.flags & VRING_DESC_F_INDIRECT) { + int64_t len; + + len = address_space_cache_init(&indirect_desc_cache, vdev->dma_as, + desc.addr, desc.len, false); + desc_cache = &indirect_desc_cache; + if (len < desc.len) { + error_setg(errp, "Cannot map indirect buffer"); + goto done; + } + i = 0; + vring_split_desc_read(vdev, &desc, desc_cache, i); + } + + element = g_new0(VirtioQueueElement, 1); + element->index = head; + element->ndescs = 0; + + do { + node = g_new0(VirtioRingDescList, 1); + node->value = g_new0(VirtioRingDesc, 1); + node->value->addr = desc.addr; + node->value->len = desc.len; + node->value->flags = qmp_decode_vring_desc_flags(desc.flags); + node->next = list; + list = node; + + element->ndescs++; + + rc = virtqueue_split_read_next_desc(vdev, &desc, desc_cache, + max, &i); + } while (rc == VIRTQUEUE_READ_DESC_MORE); + + element->descs = list; +done: + address_space_cache_destroy(&indirect_desc_cache); + } + + return element; +} + static const TypeInfo virtio_device_info = { .name = TYPE_VIRTIO_DEVICE, .parent = TYPE_DEVICE, diff --git a/qapi/virtio.json b/qapi/virtio.json index a53a6609567a..c9c1d19cb038 100644 --- a/qapi/virtio.json +++ b/qapi/virtio.json @@ -406,3 +406,97 @@ 'data': { 'path': 'str', 'queue': 'uint16' }, 'returns': 'VirtQueueStatus' } + +## +# @VirtioRingDescFlags: +# +# An enumeration of the virtio ring descriptor flags +# +# Since: 5.1 +# +## + +{ 'enum': 'VirtioRingDescFlags', + 'data': [ 'next', 'write', 'indirect', 'avail', 'used' ] +} + +## +# @VirtioRingDesc: +# +# @addr: guest physical address of the descriptor data +# +# @len: length of the descriptor data +# +# @flags: descriptor flags +# +# Since: 5.1 +# +## + +{ 'struct': 'VirtioRingDesc', + 'data': { + 'addr': 'uint64', + 'len': 'uint32', + 'flags': [ 'VirtioRingDescFlags' ] + } +} + +## +# @VirtioQueueElement: +# +# @index: index of the element in the queue +# +# @ndescs: number of descriptors +# +# @descs: list of the descriptors +# +# Since: 5.1 +# +## + +{ 'struct': 'VirtioQueueElement', + 'data': { + 'index': 'uint32', + 'ndescs': 'uint32', + 'descs': ['VirtioRingDesc'] + } +} + +## +# @virtio-queue-element: +# +# Return the information about an element queue (by default head) +# +# @path: QOBject path of the VirtIODevice +# +# @queue: queue number to examine +# +# @index: the index in the queue, by default head +# +# Returns: the element information +# +# Since: 5.1 +# +# Example: +# +# -> { "execute": "virtio-queue-element", +# "arguments": { +# "path": "/machine/peripheral-anon/device[3]/virtio-backend", +# "queue": 0 +# } +# } +# -> { "return": { +# "index": 24, +# "ndescs": 1, +# "descs": [ +# { "flags": ["write"], "len": 1536, "addr": 2027557376 } +# ] +# } +# } +# +## + +{ 'command': 'virtio-queue-element', + 'data': { 'path': 'str', 'queue': 'uint16', '*index': 'uint16' }, + 'returns': 'VirtioQueueElement' +}