From patchwork Mon May 15 16:05:06 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Stefan Hajnoczi X-Patchwork-Id: 13241763 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 2C06BC7EE22 for ; Mon, 15 May 2023 16:07:25 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S242630AbjEOQHX (ORCPT ); Mon, 15 May 2023 12:07:23 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:38424 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S242582AbjEOQHN (ORCPT ); Mon, 15 May 2023 12:07:13 -0400 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id C022A10EA for ; Mon, 15 May 2023 09:06:08 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1684166754; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=YTcjmxqtSvVPGQaZ0SXB++FKN48c2ec24jCxFpCBrLs=; b=BLhOLTMGGV5192XnkY57yq11OfgyNncO4assEL/TH8Tm3dpopr8JMfF91qfO2Poct9AeJc 5+79rz8J9dQ5JxPvYnBhNPmy/qUgrgXguK8rRmXtSWwzwATxQzdoZ/dt0qvwbpyj/PvXkq cPGgts9GZaC01XQ4mbD12V0SkikdlFQ= Received: from mimecast-mx02.redhat.com (mx3-rdu2.redhat.com [66.187.233.73]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-416-QRnZstKdPvKDqMrWGTrxOw-1; Mon, 15 May 2023 12:05:50 -0400 X-MC-Unique: QRnZstKdPvKDqMrWGTrxOw-1 Received: from smtp.corp.redhat.com (int-mx08.intmail.prod.int.rdu2.redhat.com [10.11.54.8]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id AC0D32812944; Mon, 15 May 2023 16:05:48 +0000 (UTC) Received: from localhost (unknown [10.39.192.179]) by smtp.corp.redhat.com (Postfix) with ESMTP id 28B2BC15BA0; Mon, 15 May 2023 16:05:47 +0000 (UTC) From: Stefan Hajnoczi To: qemu-devel@nongnu.org Cc: Richard Henderson , Paolo Bonzini , Thomas Huth , =?utf-8?q?Daniel_P=2E_Berrang=C3=A9?= , Julia Suvorova , Aarushi Mehta , Kevin Wolf , kvm@vger.kernel.org, Stefan Hajnoczi , =?utf-8?q?Marc-Andr=C3=A9_Lureau?= , Markus Armbruster , Cornelia Huck , Raphael Norwitz , qemu-block@nongnu.org, "Michael S. Tsirkin" , =?utf-8?q?Philippe_Mathieu-Daud?= =?utf-8?q?=C3=A9?= , Hanna Reitz , Eric Blake , Stefano Garzarella , Fam Zheng , Sam Li Subject: [PULL v2 16/16] docs/zoned-storage:add zoned emulation use case Date: Mon, 15 May 2023 12:05:06 -0400 Message-Id: <20230515160506.1776883-17-stefanha@redhat.com> In-Reply-To: <20230515160506.1776883-1-stefanha@redhat.com> References: <20230515160506.1776883-1-stefanha@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.1 on 10.11.54.8 Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org From: Sam Li Add the documentation about the example of using virtio-blk driver to pass the zoned block devices through to the guest. Signed-off-by: Sam Li Message-id: 20230508051916.178322-5-faithilikerun@gmail.com [Fix pre-formatted code syntax --Stefan] Signed-off-by: Stefan Hajnoczi --- docs/devel/zoned-storage.rst | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+) diff --git a/docs/devel/zoned-storage.rst b/docs/devel/zoned-storage.rst index da78db2783..30296d3c85 100644 --- a/docs/devel/zoned-storage.rst +++ b/docs/devel/zoned-storage.rst @@ -41,3 +41,22 @@ APIs for zoned storage emulation or testing. For example, to test zone_report on a null_blk device using qemu-io is:: $ path/to/qemu-io --image-opts -n driver=host_device,filename=/dev/nullb0 -c "zrp offset nr_zones" + +To expose the host's zoned block device through virtio-blk, the command line +can be (includes the -device parameter):: + + -blockdev node-name=drive0,driver=host_device,filename=/dev/nullb0,cache.direct=on \ + -device virtio-blk-pci,drive=drive0 + +Or only use the -drive parameter:: + + -driver driver=host_device,file=/dev/nullb0,if=virtio,cache.direct=on + +Additionally, QEMU has several ways of supporting zoned storage, including: +(1) Using virtio-scsi: --device scsi-block allows for the passing through of +SCSI ZBC devices, enabling the attachment of ZBC or ZAC HDDs to QEMU. +(2) PCI device pass-through: While NVMe ZNS emulation is available for testing +purposes, it cannot yet pass through a zoned device from the host. To pass on +the NVMe ZNS device to the guest, use VFIO PCI pass the entire NVMe PCI adapter +through to the guest. Likewise, an HDD HBA can be passed on to QEMU all HDDs +attached to the HBA.