From patchwork Tue Feb 12 14:12:29 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Stefan Hajnoczi X-Patchwork-Id: 1040622 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=pass (mailfrom) smtp.mailfrom=nongnu.org (client-ip=209.51.188.17; helo=lists.gnu.org; envelope-from=qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org; receiver=) Authentication-Results: ozlabs.org; dmarc=fail (p=none dis=none) header.from=redhat.com Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 43zQ1r1v37z9s3x for ; Wed, 13 Feb 2019 01:26:08 +1100 (AEDT) Received: from localhost ([127.0.0.1]:40561 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1gtZ0g-0008VA-2m for incoming@patchwork.ozlabs.org; Tue, 12 Feb 2019 09:26:06 -0500 Received: from eggs.gnu.org ([209.51.188.92]:53995) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1gtYoW-0007pt-SZ for qemu-devel@nongnu.org; Tue, 12 Feb 2019 09:13:33 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1gtYoV-00068s-5M for qemu-devel@nongnu.org; Tue, 12 Feb 2019 09:13:32 -0500 Received: from mx1.redhat.com ([209.132.183.28]:17200) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1gtYo9-0004uU-VK; Tue, 12 Feb 2019 09:13:10 -0500 Received: from smtp.corp.redhat.com (int-mx05.intmail.prod.int.phx2.redhat.com [10.5.11.15]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 1264780F90; Tue, 12 Feb 2019 14:12:39 +0000 (UTC) Received: from localhost (unknown [10.64.242.44]) by smtp.corp.redhat.com (Postfix) with ESMTP id 48B6862943; Tue, 12 Feb 2019 14:12:38 +0000 (UTC) From: Stefan Hajnoczi To: Peter Maydell , qemu-devel@nongnu.org Date: Tue, 12 Feb 2019 22:12:29 +0800 Message-Id: <20190212141234.2814-2-stefanha@redhat.com> In-Reply-To: <20190212141234.2814-1-stefanha@redhat.com> References: <20190212141234.2814-1-stefanha@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.15 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.27]); Tue, 12 Feb 2019 14:12:39 +0000 (UTC) X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 209.132.183.28 Subject: [Qemu-devel] [RFC PULL 1/6] virtio-blk: add acct_failed param to virtio_blk_handle_rw_error() X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Pankaj Gupta , "Michael S . Tsirkin" , Stefan Hajnoczi , qemu-block@nongnu.org, sgarzare@redhat.com Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: "Qemu-devel" From: Stefano Garzarella We add acct_failed param in order to use virtio_blk_handle_rw_error() also when is not required to call block_acct_failed(). (eg. a discard operation is failed) Reviewed-by: Michael S. Tsirkin Reviewed-by: Stefan Hajnoczi Signed-off-by: Stefano Garzarella Acked-by: Pankaj Gupta Message-id: 20190208134950.187665-2-sgarzare@redhat.com Signed-off-by: Stefan Hajnoczi --- hw/block/virtio-blk.c | 10 ++++++---- 1 file changed, 6 insertions(+), 4 deletions(-) diff --git a/hw/block/virtio-blk.c b/hw/block/virtio-blk.c index 9a87b3bfac..b2bb129efa 100644 --- a/hw/block/virtio-blk.c +++ b/hw/block/virtio-blk.c @@ -61,7 +61,7 @@ static void virtio_blk_req_complete(VirtIOBlockReq *req, unsigned char status) } static int virtio_blk_handle_rw_error(VirtIOBlockReq *req, int error, - bool is_read) + bool is_read, bool acct_failed) { BlockErrorAction action = blk_get_error_action(req->dev->blk, is_read, error); @@ -75,7 +75,9 @@ static int virtio_blk_handle_rw_error(VirtIOBlockReq *req, int error, s->rq = req; } else if (action == BLOCK_ERROR_ACTION_REPORT) { virtio_blk_req_complete(req, VIRTIO_BLK_S_IOERR); - block_acct_failed(blk_get_stats(s->blk), &req->acct); + if (acct_failed) { + block_acct_failed(blk_get_stats(s->blk), &req->acct); + } virtio_blk_free_request(req); } @@ -113,7 +115,7 @@ static void virtio_blk_rw_complete(void *opaque, int ret) * the memory until the request is completed (which will * happen on the other side of the migration). */ - if (virtio_blk_handle_rw_error(req, -ret, is_read)) { + if (virtio_blk_handle_rw_error(req, -ret, is_read, true)) { continue; } } @@ -132,7 +134,7 @@ static void virtio_blk_flush_complete(void *opaque, int ret) aio_context_acquire(blk_get_aio_context(s->conf.conf.blk)); if (ret) { - if (virtio_blk_handle_rw_error(req, -ret, 0)) { + if (virtio_blk_handle_rw_error(req, -ret, 0, true)) { goto out; } } From patchwork Tue Feb 12 14:12:30 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Stefan Hajnoczi X-Patchwork-Id: 1040618 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=pass (mailfrom) smtp.mailfrom=nongnu.org (client-ip=209.51.188.17; helo=lists.gnu.org; envelope-from=qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org; receiver=) Authentication-Results: ozlabs.org; dmarc=fail (p=none dis=none) header.from=redhat.com Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 43zPxN6mt0z9sMx for ; Wed, 13 Feb 2019 01:22:16 +1100 (AEDT) Received: from localhost ([127.0.0.1]:40491 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1gtYww-0005gU-SV for incoming@patchwork.ozlabs.org; Tue, 12 Feb 2019 09:22:14 -0500 Received: from eggs.gnu.org ([209.51.188.92]:53811) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1gtYoB-0007Um-D4 for qemu-devel@nongnu.org; Tue, 12 Feb 2019 09:13:13 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1gtYo9-0005jd-23 for qemu-devel@nongnu.org; Tue, 12 Feb 2019 09:13:11 -0500 Received: from mx1.redhat.com ([209.132.183.28]:60332) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1gtYo4-0004wi-FV; Tue, 12 Feb 2019 09:13:04 -0500 Received: from smtp.corp.redhat.com (int-mx06.intmail.prod.int.phx2.redhat.com [10.5.11.16]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 7BE9DA6411; Tue, 12 Feb 2019 14:12:41 +0000 (UTC) Received: from localhost (unknown [10.64.242.44]) by smtp.corp.redhat.com (Postfix) with ESMTP id B63D25C21A; Tue, 12 Feb 2019 14:12:40 +0000 (UTC) From: Stefan Hajnoczi To: Peter Maydell , qemu-devel@nongnu.org Date: Tue, 12 Feb 2019 22:12:30 +0800 Message-Id: <20190212141234.2814-3-stefanha@redhat.com> In-Reply-To: <20190212141234.2814-1-stefanha@redhat.com> References: <20190212141234.2814-1-stefanha@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.16 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.25]); Tue, 12 Feb 2019 14:12:41 +0000 (UTC) X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 209.132.183.28 Subject: [Qemu-devel] [RFC PULL 2/6] virtio-blk: add host_features field in VirtIOBlock X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Pankaj Gupta , "Michael S . Tsirkin" , Stefan Hajnoczi , qemu-block@nongnu.org, sgarzare@redhat.com Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: "Qemu-devel" From: Stefano Garzarella Since configurable features for virtio-blk are growing, this patch adds host_features field in the struct VirtIOBlock. (as in virtio-net) In this way, we can avoid to add new fields for new properties and we can directly set VIRTIO_BLK_F* flags in the host_features. We update "config-wce" and "scsi" property definition to use the new host_features field without change the behaviour. Suggested-by: Michael S. Tsirkin Reviewed-by: Stefan Hajnoczi Signed-off-by: Stefano Garzarella Acked-by: Pankaj Gupta Message-id: 20190208134950.187665-3-sgarzare@redhat.com Signed-off-by: Stefan Hajnoczi --- include/hw/virtio/virtio-blk.h | 3 +-- hw/block/virtio-blk.c | 16 +++++++++------- 2 files changed, 10 insertions(+), 9 deletions(-) diff --git a/include/hw/virtio/virtio-blk.h b/include/hw/virtio/virtio-blk.h index 5117431d96..f7345b0511 100644 --- a/include/hw/virtio/virtio-blk.h +++ b/include/hw/virtio/virtio-blk.h @@ -35,8 +35,6 @@ struct VirtIOBlkConf BlockConf conf; IOThread *iothread; char *serial; - uint32_t scsi; - uint32_t config_wce; uint32_t request_merging; uint16_t num_queues; uint16_t queue_size; @@ -57,6 +55,7 @@ typedef struct VirtIOBlock { bool dataplane_disabled; bool dataplane_started; struct VirtIOBlockDataPlane *dataplane; + uint64_t host_features; } VirtIOBlock; typedef struct VirtIOBlockReq { diff --git a/hw/block/virtio-blk.c b/hw/block/virtio-blk.c index b2bb129efa..938273c63c 100644 --- a/hw/block/virtio-blk.c +++ b/hw/block/virtio-blk.c @@ -242,7 +242,7 @@ static int virtio_blk_handle_scsi_req(VirtIOBlockReq *req) */ scsi = (void *)elem->in_sg[elem->in_num - 2].iov_base; - if (!blk->conf.scsi) { + if (!virtio_has_feature(blk->host_features, VIRTIO_BLK_F_SCSI)) { status = VIRTIO_BLK_S_UNSUPP; goto fail; } @@ -783,12 +783,15 @@ static uint64_t virtio_blk_get_features(VirtIODevice *vdev, uint64_t features, { VirtIOBlock *s = VIRTIO_BLK(vdev); + /* Firstly sync all virtio-blk possible supported features */ + features |= s->host_features; + virtio_add_feature(&features, VIRTIO_BLK_F_SEG_MAX); virtio_add_feature(&features, VIRTIO_BLK_F_GEOMETRY); virtio_add_feature(&features, VIRTIO_BLK_F_TOPOLOGY); virtio_add_feature(&features, VIRTIO_BLK_F_BLK_SIZE); if (virtio_has_feature(features, VIRTIO_F_VERSION_1)) { - if (s->conf.scsi) { + if (virtio_has_feature(s->host_features, VIRTIO_BLK_F_SCSI)) { error_setg(errp, "Please set scsi=off for virtio-blk devices in order to use virtio 1.0"); return 0; } @@ -797,9 +800,6 @@ static uint64_t virtio_blk_get_features(VirtIODevice *vdev, uint64_t features, virtio_add_feature(&features, VIRTIO_BLK_F_SCSI); } - if (s->conf.config_wce) { - virtio_add_feature(&features, VIRTIO_BLK_F_CONFIG_WCE); - } if (blk_enable_write_cache(s->blk)) { virtio_add_feature(&features, VIRTIO_BLK_F_WCE); } @@ -1014,9 +1014,11 @@ static Property virtio_blk_properties[] = { DEFINE_BLOCK_ERROR_PROPERTIES(VirtIOBlock, conf.conf), DEFINE_BLOCK_CHS_PROPERTIES(VirtIOBlock, conf.conf), DEFINE_PROP_STRING("serial", VirtIOBlock, conf.serial), - DEFINE_PROP_BIT("config-wce", VirtIOBlock, conf.config_wce, 0, true), + DEFINE_PROP_BIT64("config-wce", VirtIOBlock, host_features, + VIRTIO_BLK_F_CONFIG_WCE, true), #ifdef __linux__ - DEFINE_PROP_BIT("scsi", VirtIOBlock, conf.scsi, 0, false), + DEFINE_PROP_BIT64("scsi", VirtIOBlock, host_features, + VIRTIO_BLK_F_SCSI, false), #endif DEFINE_PROP_BIT("request-merging", VirtIOBlock, conf.request_merging, 0, true), From patchwork Tue Feb 12 14:12:31 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Stefan Hajnoczi X-Patchwork-Id: 1040623 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=pass (mailfrom) smtp.mailfrom=nongnu.org (client-ip=209.51.188.17; helo=lists.gnu.org; envelope-from=qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org; receiver=) Authentication-Results: ozlabs.org; dmarc=fail (p=none dis=none) header.from=redhat.com Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 43zQ2D2qgrz9s3x for ; Wed, 13 Feb 2019 01:26:28 +1100 (AEDT) Received: from localhost ([127.0.0.1]:40565 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1gtZ10-0000JS-AG for incoming@patchwork.ozlabs.org; Tue, 12 Feb 2019 09:26:26 -0500 Received: from eggs.gnu.org ([209.51.188.92]:53945) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1gtYoF-0007ZV-P4 for qemu-devel@nongnu.org; Tue, 12 Feb 2019 09:13:21 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1gtYoE-0005t9-Ee for qemu-devel@nongnu.org; Tue, 12 Feb 2019 09:13:15 -0500 Received: from mx1.redhat.com ([209.132.183.28]:40392) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1gtYo9-0004za-CM; Tue, 12 Feb 2019 09:13:09 -0500 Received: from smtp.corp.redhat.com (int-mx05.intmail.prod.int.phx2.redhat.com [10.5.11.15]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id B774EC6107; Tue, 12 Feb 2019 14:12:43 +0000 (UTC) Received: from localhost (unknown [10.64.242.44]) by smtp.corp.redhat.com (Postfix) with ESMTP id 2FB8262986; Tue, 12 Feb 2019 14:12:43 +0000 (UTC) From: Stefan Hajnoczi To: Peter Maydell , qemu-devel@nongnu.org Date: Tue, 12 Feb 2019 22:12:31 +0800 Message-Id: <20190212141234.2814-4-stefanha@redhat.com> In-Reply-To: <20190212141234.2814-1-stefanha@redhat.com> References: <20190212141234.2814-1-stefanha@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.15 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.30]); Tue, 12 Feb 2019 14:12:43 +0000 (UTC) X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 209.132.183.28 Subject: [Qemu-devel] [RFC PULL 3/6] virtio-blk: add "discard" and "write-zeroes" properties X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Pankaj Gupta , qemu-block@nongnu.org, "Michael S . Tsirkin" , "Dr . David Alan Gilbert" , Stefan Hajnoczi , sgarzare@redhat.com Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: "Qemu-devel" From: Stefano Garzarella In order to avoid migration issues, we enable DISCARD and WRITE_ZEROES features only for machine type >= 4.0 As discussed with Michael S. Tsirkin and Stefan Hajnoczi on the list [1], DISCARD operation should not have security implications (eg. page cache attacks), so we can enable it by default. [1] https://lists.gnu.org/archive/html/qemu-devel/2019-02/msg00504.html Suggested-by: Dr. David Alan Gilbert Reviewed-by: Michael S. Tsirkin Reviewed-by: Stefan Hajnoczi Signed-off-by: Stefano Garzarella Acked-by: Pankaj Gupta Message-id: 20190208134950.187665-4-sgarzare@redhat.com Signed-off-by: Stefan Hajnoczi --- hw/block/virtio-blk.c | 4 ++++ hw/core/machine.c | 2 ++ 2 files changed, 6 insertions(+) diff --git a/hw/block/virtio-blk.c b/hw/block/virtio-blk.c index 938273c63c..6f2e86264d 100644 --- a/hw/block/virtio-blk.c +++ b/hw/block/virtio-blk.c @@ -1026,6 +1026,10 @@ static Property virtio_blk_properties[] = { DEFINE_PROP_UINT16("queue-size", VirtIOBlock, conf.queue_size, 128), DEFINE_PROP_LINK("iothread", VirtIOBlock, conf.iothread, TYPE_IOTHREAD, IOThread *), + DEFINE_PROP_BIT64("discard", VirtIOBlock, host_features, + VIRTIO_BLK_F_DISCARD, true), + DEFINE_PROP_BIT64("write-zeroes", VirtIOBlock, host_features, + VIRTIO_BLK_F_WRITE_ZEROES, true), DEFINE_PROP_END_OF_LIST(), }; diff --git a/hw/core/machine.c b/hw/core/machine.c index 077fbd182a..766ca5899d 100644 --- a/hw/core/machine.c +++ b/hw/core/machine.c @@ -33,6 +33,8 @@ GlobalProperty hw_compat_3_1[] = { { "usb-kbd", "serial", "42" }, { "usb-mouse", "serial", "42" }, { "usb-kbd", "serial", "42" }, + { "virtio-blk-device", "discard", "false" }, + { "virtio-blk-device", "write-zeroes", "false" }, }; const size_t hw_compat_3_1_len = G_N_ELEMENTS(hw_compat_3_1); From patchwork Tue Feb 12 14:12:32 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Stefan Hajnoczi X-Patchwork-Id: 1040606 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=pass (mailfrom) smtp.mailfrom=nongnu.org (client-ip=209.51.188.17; helo=lists.gnu.org; envelope-from=qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org; receiver=) Authentication-Results: ozlabs.org; dmarc=fail (p=none dis=none) header.from=redhat.com Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 43zPnr1d77z9sMl for ; Wed, 13 Feb 2019 01:15:44 +1100 (AEDT) Received: from localhost ([127.0.0.1]:40346 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1gtYqb-0000cl-Kq for incoming@patchwork.ozlabs.org; Tue, 12 Feb 2019 09:15:41 -0500 Received: from eggs.gnu.org ([209.51.188.92]:53657) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1gtYo4-0007Og-C6 for qemu-devel@nongnu.org; Tue, 12 Feb 2019 09:13:05 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1gtYo2-0005dO-P3 for qemu-devel@nongnu.org; Tue, 12 Feb 2019 09:13:04 -0500 Received: from mx1.redhat.com ([209.132.183.28]:57837) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1gtYnx-00057V-Cm; Tue, 12 Feb 2019 09:12:58 -0500 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 mx1.redhat.com (Postfix) with ESMTPS id 4ED11A327C; Tue, 12 Feb 2019 14:12:46 +0000 (UTC) Received: from localhost (unknown [10.64.242.44]) by smtp.corp.redhat.com (Postfix) with ESMTP id C03D95D962; Tue, 12 Feb 2019 14:12:45 +0000 (UTC) From: Stefan Hajnoczi To: Peter Maydell , qemu-devel@nongnu.org Date: Tue, 12 Feb 2019 22:12:32 +0800 Message-Id: <20190212141234.2814-5-stefanha@redhat.com> In-Reply-To: <20190212141234.2814-1-stefanha@redhat.com> References: <20190212141234.2814-1-stefanha@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.14 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.39]); Tue, 12 Feb 2019 14:12:46 +0000 (UTC) X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 209.132.183.28 Subject: [Qemu-devel] [RFC PULL 4/6] virtio-blk: add DISCARD and WRITE_ZEROES features X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Pankaj Gupta , "Michael S . Tsirkin" , Stefan Hajnoczi , qemu-block@nongnu.org, sgarzare@redhat.com Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: "Qemu-devel" From: Stefano Garzarella This patch adds the support of DISCARD and WRITE_ZEROES commands, that have been introduced in the virtio-blk protocol to have better performance when using SSD backend. We support only one segment per request since multiple segments are not widely used and there are no userspace APIs that allow applications to submit multiple segments in a single call. Reviewed-by: Michael S. Tsirkin Reviewed-by: Stefan Hajnoczi Signed-off-by: Stefano Garzarella Acked-by: Pankaj Gupta Message-id: 20190208134950.187665-5-sgarzare@redhat.com Signed-off-by: Stefan Hajnoczi --- include/hw/virtio/virtio-blk.h | 2 + hw/block/virtio-blk.c | 184 +++++++++++++++++++++++++++++++++ 2 files changed, 186 insertions(+) diff --git a/include/hw/virtio/virtio-blk.h b/include/hw/virtio/virtio-blk.h index f7345b0511..015b523fe0 100644 --- a/include/hw/virtio/virtio-blk.h +++ b/include/hw/virtio/virtio-blk.h @@ -38,6 +38,8 @@ struct VirtIOBlkConf uint32_t request_merging; uint16_t num_queues; uint16_t queue_size; + uint32_t max_discard_sectors; + uint32_t max_write_zeroes_sectors; }; struct VirtIOBlockDataPlane; diff --git a/hw/block/virtio-blk.c b/hw/block/virtio-blk.c index 6f2e86264d..5d1b823b66 100644 --- a/hw/block/virtio-blk.c +++ b/hw/block/virtio-blk.c @@ -147,6 +147,30 @@ out: aio_context_release(blk_get_aio_context(s->conf.conf.blk)); } +static void virtio_blk_discard_write_zeroes_complete(void *opaque, int ret) +{ + VirtIOBlockReq *req = opaque; + VirtIOBlock *s = req->dev; + bool is_write_zeroes = (virtio_ldl_p(VIRTIO_DEVICE(s), &req->out.type) & + ~VIRTIO_BLK_T_BARRIER) == VIRTIO_BLK_T_WRITE_ZEROES; + + aio_context_acquire(blk_get_aio_context(s->conf.conf.blk)); + if (ret) { + if (virtio_blk_handle_rw_error(req, -ret, false, is_write_zeroes)) { + goto out; + } + } + + virtio_blk_req_complete(req, VIRTIO_BLK_S_OK); + if (is_write_zeroes) { + block_acct_done(blk_get_stats(s->blk), &req->acct); + } + virtio_blk_free_request(req); + +out: + aio_context_release(blk_get_aio_context(s->conf.conf.blk)); +} + #ifdef __linux__ typedef struct { @@ -480,6 +504,84 @@ static bool virtio_blk_sect_range_ok(VirtIOBlock *dev, return true; } +static uint8_t virtio_blk_handle_discard_write_zeroes(VirtIOBlockReq *req, + struct virtio_blk_discard_write_zeroes *dwz_hdr, bool is_write_zeroes) +{ + VirtIOBlock *s = req->dev; + VirtIODevice *vdev = VIRTIO_DEVICE(s); + uint64_t sector; + uint32_t num_sectors, flags, max_sectors; + uint8_t err_status; + int bytes; + + sector = virtio_ldq_p(vdev, &dwz_hdr->sector); + num_sectors = virtio_ldl_p(vdev, &dwz_hdr->num_sectors); + flags = virtio_ldl_p(vdev, &dwz_hdr->flags); + max_sectors = is_write_zeroes ? s->conf.max_write_zeroes_sectors : + s->conf.max_discard_sectors; + + /* + * max_sectors is at most BDRV_REQUEST_MAX_SECTORS, this check + * make us sure that "num_sectors << BDRV_SECTOR_BITS" can fit in + * the integer variable. + */ + if (unlikely(num_sectors > max_sectors)) { + err_status = VIRTIO_BLK_S_IOERR; + goto err; + } + + bytes = num_sectors << BDRV_SECTOR_BITS; + + if (unlikely(!virtio_blk_sect_range_ok(s, sector, bytes))) { + err_status = VIRTIO_BLK_S_IOERR; + goto err; + } + + /* + * The device MUST set the status byte to VIRTIO_BLK_S_UNSUPP for discard + * and write zeroes commands if any unknown flag is set. + */ + if (unlikely(flags & ~VIRTIO_BLK_WRITE_ZEROES_FLAG_UNMAP)) { + err_status = VIRTIO_BLK_S_UNSUPP; + goto err; + } + + if (is_write_zeroes) { /* VIRTIO_BLK_T_WRITE_ZEROES */ + int blk_aio_flags = 0; + + if (flags & VIRTIO_BLK_WRITE_ZEROES_FLAG_UNMAP) { + blk_aio_flags |= BDRV_REQ_MAY_UNMAP; + } + + block_acct_start(blk_get_stats(s->blk), &req->acct, bytes, + BLOCK_ACCT_WRITE); + + blk_aio_pwrite_zeroes(s->blk, sector << BDRV_SECTOR_BITS, + bytes, blk_aio_flags, + virtio_blk_discard_write_zeroes_complete, req); + } else { /* VIRTIO_BLK_T_DISCARD */ + /* + * The device MUST set the status byte to VIRTIO_BLK_S_UNSUPP for + * discard commands if the unmap flag is set. + */ + if (unlikely(flags & VIRTIO_BLK_WRITE_ZEROES_FLAG_UNMAP)) { + err_status = VIRTIO_BLK_S_UNSUPP; + goto err; + } + + blk_aio_pdiscard(s->blk, sector << BDRV_SECTOR_BITS, bytes, + virtio_blk_discard_write_zeroes_complete, req); + } + + return VIRTIO_BLK_S_OK; + +err: + if (is_write_zeroes) { + block_acct_invalid(blk_get_stats(s->blk), BLOCK_ACCT_WRITE); + } + return err_status; +} + static int virtio_blk_handle_request(VirtIOBlockReq *req, MultiReqBuffer *mrb) { uint32_t type; @@ -584,6 +686,47 @@ static int virtio_blk_handle_request(VirtIOBlockReq *req, MultiReqBuffer *mrb) virtio_blk_free_request(req); break; } + /* + * VIRTIO_BLK_T_DISCARD and VIRTIO_BLK_T_WRITE_ZEROES are defined with + * VIRTIO_BLK_T_OUT flag set. We masked this flag in the switch statement, + * so we must mask it for these requests, then we will check if it is set. + */ + case VIRTIO_BLK_T_DISCARD & ~VIRTIO_BLK_T_OUT: + case VIRTIO_BLK_T_WRITE_ZEROES & ~VIRTIO_BLK_T_OUT: + { + struct virtio_blk_discard_write_zeroes dwz_hdr; + size_t out_len = iov_size(out_iov, out_num); + bool is_write_zeroes = (type & ~VIRTIO_BLK_T_BARRIER) == + VIRTIO_BLK_T_WRITE_ZEROES; + uint8_t err_status; + + /* + * Unsupported if VIRTIO_BLK_T_OUT is not set or the request contains + * more than one segment. + */ + if (unlikely(!(type & VIRTIO_BLK_T_OUT) || + out_len > sizeof(dwz_hdr))) { + virtio_blk_req_complete(req, VIRTIO_BLK_S_UNSUPP); + virtio_blk_free_request(req); + return 0; + } + + if (unlikely(iov_to_buf(out_iov, out_num, 0, &dwz_hdr, + sizeof(dwz_hdr)) != sizeof(dwz_hdr))) { + virtio_error(vdev, "virtio-blk discard/write_zeroes header" + " too short"); + return -1; + } + + err_status = virtio_blk_handle_discard_write_zeroes(req, &dwz_hdr, + is_write_zeroes); + if (err_status != VIRTIO_BLK_S_OK) { + virtio_blk_req_complete(req, err_status); + virtio_blk_free_request(req); + } + + break; + } default: virtio_blk_req_complete(req, VIRTIO_BLK_S_UNSUPP); virtio_blk_free_request(req); @@ -763,6 +906,24 @@ static void virtio_blk_update_config(VirtIODevice *vdev, uint8_t *config) blkcfg.alignment_offset = 0; blkcfg.wce = blk_enable_write_cache(s->blk); virtio_stw_p(vdev, &blkcfg.num_queues, s->conf.num_queues); + if (virtio_has_feature(s->host_features, VIRTIO_BLK_F_DISCARD)) { + virtio_stl_p(vdev, &blkcfg.max_discard_sectors, + s->conf.max_discard_sectors); + virtio_stl_p(vdev, &blkcfg.discard_sector_alignment, + blk_size >> BDRV_SECTOR_BITS); + /* + * We support only one segment per request since multiple segments + * are not widely used and there are no userspace APIs that allow + * applications to submit multiple segments in a single call. + */ + virtio_stl_p(vdev, &blkcfg.max_discard_seg, 1); + } + if (virtio_has_feature(s->host_features, VIRTIO_BLK_F_WRITE_ZEROES)) { + virtio_stl_p(vdev, &blkcfg.max_write_zeroes_sectors, + s->conf.max_write_zeroes_sectors); + blkcfg.write_zeroes_may_unmap = 1; + virtio_stl_p(vdev, &blkcfg.max_write_zeroes_seg, 1); + } memcpy(config, &blkcfg, sizeof(struct virtio_blk_config)); } @@ -954,6 +1115,25 @@ static void virtio_blk_device_realize(DeviceState *dev, Error **errp) return; } + if (virtio_has_feature(s->host_features, VIRTIO_BLK_F_DISCARD) && + (!conf->max_discard_sectors || + conf->max_discard_sectors > BDRV_REQUEST_MAX_SECTORS)) { + error_setg(errp, "invalid max-discard-sectors property (%" PRIu32 ")" + ", must be between 1 and %d", + conf->max_discard_sectors, (int)BDRV_REQUEST_MAX_SECTORS); + return; + } + + if (virtio_has_feature(s->host_features, VIRTIO_BLK_F_WRITE_ZEROES) && + (!conf->max_write_zeroes_sectors || + conf->max_write_zeroes_sectors > BDRV_REQUEST_MAX_SECTORS)) { + error_setg(errp, "invalid max-write-zeroes-sectors property (%" PRIu32 + "), must be between 1 and %d", + conf->max_write_zeroes_sectors, + (int)BDRV_REQUEST_MAX_SECTORS); + return; + } + virtio_init(vdev, "virtio-blk", VIRTIO_ID_BLOCK, sizeof(struct virtio_blk_config)); @@ -1030,6 +1210,10 @@ static Property virtio_blk_properties[] = { VIRTIO_BLK_F_DISCARD, true), DEFINE_PROP_BIT64("write-zeroes", VirtIOBlock, host_features, VIRTIO_BLK_F_WRITE_ZEROES, true), + DEFINE_PROP_UINT32("max-discard-sectors", VirtIOBlock, + conf.max_discard_sectors, BDRV_REQUEST_MAX_SECTORS), + DEFINE_PROP_UINT32("max-write-zeroes-sectors", VirtIOBlock, + conf.max_write_zeroes_sectors, BDRV_REQUEST_MAX_SECTORS), DEFINE_PROP_END_OF_LIST(), }; From patchwork Tue Feb 12 14:12:33 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Stefan Hajnoczi X-Patchwork-Id: 1040620 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=pass (mailfrom) smtp.mailfrom=nongnu.org (client-ip=209.51.188.17; helo=lists.gnu.org; envelope-from=qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org; receiver=) Authentication-Results: ozlabs.org; dmarc=fail (p=none dis=none) header.from=redhat.com Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 43zPzl6tbXz9s3x for ; Wed, 13 Feb 2019 01:24:19 +1100 (AEDT) Received: from localhost ([127.0.0.1]:40516 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1gtYyv-000735-UT for incoming@patchwork.ozlabs.org; Tue, 12 Feb 2019 09:24:17 -0500 Received: from eggs.gnu.org ([209.51.188.92]:53924) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1gtYoE-0007Y4-J7 for qemu-devel@nongnu.org; Tue, 12 Feb 2019 09:13:20 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1gtYoD-0005qV-4w for qemu-devel@nongnu.org; Tue, 12 Feb 2019 09:13:14 -0500 Received: from mx1.redhat.com ([209.132.183.28]:58422) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1gtYo9-0005Gj-1k; Tue, 12 Feb 2019 09:13:09 -0500 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 mx1.redhat.com (Postfix) with ESMTPS id AC2FEC0C7CB5; Tue, 12 Feb 2019 14:12:48 +0000 (UTC) Received: from localhost (unknown [10.64.242.44]) by smtp.corp.redhat.com (Postfix) with ESMTP id 0532410021B1; Tue, 12 Feb 2019 14:12:47 +0000 (UTC) From: Stefan Hajnoczi To: Peter Maydell , qemu-devel@nongnu.org Date: Tue, 12 Feb 2019 22:12:33 +0800 Message-Id: <20190212141234.2814-6-stefanha@redhat.com> In-Reply-To: <20190212141234.2814-1-stefanha@redhat.com> References: <20190212141234.2814-1-stefanha@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.84 on 10.5.11.22 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.31]); Tue, 12 Feb 2019 14:12:48 +0000 (UTC) X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 209.132.183.28 Subject: [Qemu-devel] [RFC PULL 5/6] tests/virtio-blk: change assert on data_size in virtio_blk_request() X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Pankaj Gupta , Thomas Huth , qemu-block@nongnu.org, "Michael S . Tsirkin" , Stefan Hajnoczi , sgarzare@redhat.com Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: "Qemu-devel" From: Stefano Garzarella The size of data in the virtio_blk_request must be a multiple of 512 bytes for IN and OUT requests, or a multiple of the size of struct virtio_blk_discard_write_zeroes for DISCARD and WRITE_ZEROES requests. Reviewed-by: Michael S. Tsirkin Reviewed-by: Stefan Hajnoczi Reviewed-by: Thomas Huth Signed-off-by: Stefano Garzarella Acked-by: Pankaj Gupta Message-id: 20190208134950.187665-6-sgarzare@redhat.com Signed-off-by: Stefan Hajnoczi --- tests/virtio-blk-test.c | 15 ++++++++++++++- 1 file changed, 14 insertions(+), 1 deletion(-) diff --git a/tests/virtio-blk-test.c b/tests/virtio-blk-test.c index 04c608764b..0739498da7 100644 --- a/tests/virtio-blk-test.c +++ b/tests/virtio-blk-test.c @@ -144,7 +144,20 @@ static uint64_t virtio_blk_request(QGuestAllocator *alloc, QVirtioDevice *d, uint64_t addr; uint8_t status = 0xFF; - g_assert_cmpuint(data_size % 512, ==, 0); + switch (req->type) { + case VIRTIO_BLK_T_IN: + case VIRTIO_BLK_T_OUT: + g_assert_cmpuint(data_size % 512, ==, 0); + break; + case VIRTIO_BLK_T_DISCARD: + case VIRTIO_BLK_T_WRITE_ZEROES: + g_assert_cmpuint(data_size % + sizeof(struct virtio_blk_discard_write_zeroes), ==, 0); + break; + default: + g_assert_cmpuint(data_size, ==, 0); + } + addr = guest_alloc(alloc, sizeof(*req) + data_size); virtio_blk_fix_request(d, req); From patchwork Tue Feb 12 14:12:34 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Stefan Hajnoczi X-Patchwork-Id: 1040610 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=pass (mailfrom) smtp.mailfrom=nongnu.org (client-ip=209.51.188.17; helo=lists.gnu.org; envelope-from=qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org; receiver=) Authentication-Results: ozlabs.org; dmarc=fail (p=none dis=none) header.from=redhat.com Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 43zPqf16PBz9s3x for ; Wed, 13 Feb 2019 01:17:18 +1100 (AEDT) Received: from localhost ([127.0.0.1]:40398 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1gtYs8-0001qN-12 for incoming@patchwork.ozlabs.org; Tue, 12 Feb 2019 09:17:16 -0500 Received: from eggs.gnu.org ([209.51.188.92]:53974) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1gtYoR-0007kk-6v for qemu-devel@nongnu.org; Tue, 12 Feb 2019 09:13:28 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1gtYoE-0005t6-EI for qemu-devel@nongnu.org; Tue, 12 Feb 2019 09:13:25 -0500 Received: from mx1.redhat.com ([209.132.183.28]:52200) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1gtYo9-0005Q0-RV; Tue, 12 Feb 2019 09:13:10 -0500 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 mx1.redhat.com (Postfix) with ESMTPS id 88DEFC0C8CCD; Tue, 12 Feb 2019 14:12:51 +0000 (UTC) Received: from localhost (unknown [10.64.242.44]) by smtp.corp.redhat.com (Postfix) with ESMTP id A802B108BEEF; Tue, 12 Feb 2019 14:12:50 +0000 (UTC) From: Stefan Hajnoczi To: Peter Maydell , qemu-devel@nongnu.org Date: Tue, 12 Feb 2019 22:12:34 +0800 Message-Id: <20190212141234.2814-7-stefanha@redhat.com> In-Reply-To: <20190212141234.2814-1-stefanha@redhat.com> References: <20190212141234.2814-1-stefanha@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.84 on 10.5.11.22 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.31]); Tue, 12 Feb 2019 14:12:51 +0000 (UTC) X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 209.132.183.28 Subject: [Qemu-devel] [RFC PULL 6/6] tests/virtio-blk: add test for WRITE_ZEROES command X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Pankaj Gupta , Thomas Huth , qemu-block@nongnu.org, "Michael S . Tsirkin" , Stefan Hajnoczi , sgarzare@redhat.com Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: "Qemu-devel" From: Stefano Garzarella If the WRITE_ZEROES feature is enabled, we check this command in the test_basic(). Reviewed-by: Michael S. Tsirkin Reviewed-by: Stefan Hajnoczi Acked-by: Thomas Huth Signed-off-by: Stefano Garzarella Acked-by: Pankaj Gupta Message-id: 20190208134950.187665-7-sgarzare@redhat.com Signed-off-by: Stefan Hajnoczi --- tests/virtio-blk-test.c | 60 +++++++++++++++++++++++++++++++++++++++++ 1 file changed, 60 insertions(+) diff --git a/tests/virtio-blk-test.c b/tests/virtio-blk-test.c index 0739498da7..35bd92dbfc 100644 --- a/tests/virtio-blk-test.c +++ b/tests/virtio-blk-test.c @@ -244,6 +244,66 @@ static void test_basic(QVirtioDevice *dev, QGuestAllocator *alloc, guest_free(alloc, req_addr); + if (features & (1u << VIRTIO_BLK_F_WRITE_ZEROES)) { + struct virtio_blk_discard_write_zeroes dwz_hdr; + void *expected; + + /* + * WRITE_ZEROES request on the same sector of previous test where + * we wrote "TEST". + */ + req.type = VIRTIO_BLK_T_WRITE_ZEROES; + req.data = (char *) &dwz_hdr; + dwz_hdr.sector = 0; + dwz_hdr.num_sectors = 1; + dwz_hdr.flags = 0; + + req_addr = virtio_blk_request(alloc, dev, &req, sizeof(dwz_hdr)); + + free_head = qvirtqueue_add(vq, req_addr, 16, false, true); + qvirtqueue_add(vq, req_addr + 16, sizeof(dwz_hdr), false, true); + qvirtqueue_add(vq, req_addr + 16 + sizeof(dwz_hdr), 1, true, false); + + qvirtqueue_kick(dev, vq, free_head); + + qvirtio_wait_used_elem(dev, vq, free_head, NULL, + QVIRTIO_BLK_TIMEOUT_US); + status = readb(req_addr + 16 + sizeof(dwz_hdr)); + g_assert_cmpint(status, ==, 0); + + guest_free(alloc, req_addr); + + /* Read request to check if the sector contains all zeroes */ + req.type = VIRTIO_BLK_T_IN; + req.ioprio = 1; + req.sector = 0; + req.data = g_malloc0(512); + + req_addr = virtio_blk_request(alloc, dev, &req, 512); + + g_free(req.data); + + free_head = qvirtqueue_add(vq, req_addr, 16, false, true); + qvirtqueue_add(vq, req_addr + 16, 512, true, true); + qvirtqueue_add(vq, req_addr + 528, 1, true, false); + + qvirtqueue_kick(dev, vq, free_head); + + qvirtio_wait_used_elem(dev, vq, free_head, NULL, + QVIRTIO_BLK_TIMEOUT_US); + status = readb(req_addr + 528); + g_assert_cmpint(status, ==, 0); + + data = g_malloc(512); + expected = g_malloc0(512); + memread(req_addr + 16, data, 512); + g_assert_cmpmem(data, 512, expected, 512); + g_free(expected); + g_free(data); + + guest_free(alloc, req_addr); + } + if (features & (1u << VIRTIO_F_ANY_LAYOUT)) { /* Write and read with 2 descriptor layout */ /* Write request */