From mboxrd@z Thu Jan 1 00:00:00 1970 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 lists1p.gnu.org (lists1p.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id C3A3DCDB47F for ; Wed, 24 Jun 2026 19:22:27 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists1p.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1wcTAP-0002js-ID; Wed, 24 Jun 2026 15:21:45 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists1p.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1wcTAI-0002jY-2u for qemu-devel@nongnu.org; Wed, 24 Jun 2026 15:21:38 -0400 Received: from us-smtp-delivery-124.mimecast.com ([170.10.129.124]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1wcTAF-0007Xc-UM for qemu-devel@nongnu.org; Wed, 24 Jun 2026 15:21:37 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1782328894; 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: in-reply-to:in-reply-to:references:references; bh=jaeg/PA7yWdgOgQBl7bkcl6SdBl5SL48gt6NzwYzObE=; b=al6Qbp3xScGkpNDupDEcSn52uZNGIJyxcFyD2dCtOTpvW6dDvTykCELrTZ/H1VgYPfAAOI 8VqSECTLSo6Hv9SlfmGyXf2FkjJ9xL3wGOH+G2kiAoVAbaVxB6P5Fh536tX4l29BKjFqUE mPmFsTayQoOZ6/ExCpwgNcBX9Oqy1Ds= Received: from mx-prod-mc-06.mail-002.prod.us-west-2.aws.redhat.com (ec2-35-165-154-97.us-west-2.compute.amazonaws.com [35.165.154.97]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-39-se_5FLeZPR2Tr6UZNwQu-Q-1; Wed, 24 Jun 2026 15:21:29 -0400 X-MC-Unique: se_5FLeZPR2Tr6UZNwQu-Q-1 X-Mimecast-MFC-AGG-ID: se_5FLeZPR2Tr6UZNwQu-Q_1782328887 Received: from mx-prod-int-05.mail-002.prod.us-west-2.aws.redhat.com (mx-prod-int-05.mail-002.prod.us-west-2.aws.redhat.com [10.30.177.17]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mx-prod-mc-06.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id 952EC18001F3; Wed, 24 Jun 2026 19:21:27 +0000 (UTC) Received: from localhost (unknown [10.2.17.97]) by mx-prod-int-05.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTP id BD2721956041; Wed, 24 Jun 2026 19:21:26 +0000 (UTC) Date: Wed, 24 Jun 2026 15:21:25 -0400 From: Stefan Hajnoczi To: Sam Li Cc: qemu-devel@nongnu.org, "Michael S. Tsirkin" , Hanna Reitz , Kevin Wolf , cassel@kernel.org, dlemoal@kernel.org, qemu-block@nongnu.org, dmitry.fomichev@wdc.com, Markus Armbruster , Pierrick Bouvier , Eric Blake Subject: Re: [PATCH v12 3/5] virtio-blk: do not merge writes across a zone boundary Message-ID: <20260624192125.GG109308@fedora> References: <20260623184830.373232-1-faithilikerun@gmail.com> <20260623184830.373232-4-faithilikerun@gmail.com> MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha512; protocol="application/pgp-signature"; boundary="RMdWOKqZmxKwB+oz" Content-Disposition: inline In-Reply-To: <20260623184830.373232-4-faithilikerun@gmail.com> X-Scanned-By: MIMEDefang 3.0 on 10.30.177.17 Received-SPF: pass client-ip=170.10.129.124; envelope-from=stefanha@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -24 X-Spam_score: -2.5 X-Spam_bar: -- X-Spam_report: (-2.5 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.445, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H3=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_PASS=-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: 2.1.29 Precedence: list List-Id: qemu development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org --RMdWOKqZmxKwB+oz Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Tue, Jun 23, 2026 at 08:48:28PM +0200, Sam Li wrote: > virtio_blk_submit_multireq() fuses adjacent in-zone writes into a > single request. On a zoned backend, a merged zone append request > that straddles a zone boundary is rejected by the device because > each write must stay within a single zone. >=20 > Add a bail condition to the merge coalescer: if combining the > candidate request into the current batch would cross a zone > boundary, flush the current batch and start a new one. >=20 > Signed-off-by: Sam Li > --- > block/block-backend.c | 11 +++++++++++ > hw/block/virtio-blk.c | 22 +++++++++++++++++++++- > include/system/block-backend-io.h | 1 + > 3 files changed, 33 insertions(+), 1 deletion(-) Reviewed-by: Stefan Hajnoczi --RMdWOKqZmxKwB+oz Content-Type: application/pgp-signature; name=signature.asc -----BEGIN PGP SIGNATURE----- iQEzBAEBCgAdFiEEhpWov9P5fNqsNXdanKSrs4Grc8gFAmo8LjUACgkQnKSrs4Gr c8iLPQf+MYIX/kI6qETg0Ky+InEYlTIjmb/moKq9/4yD6FM9qsHWJKMKug0dfpVp fUUjphzmbVpvMFbrl/VWxZhrJu6t5LTSCYyhwnb+nsj8i43p5jurhhbPzvskCvHZ NP5sqsbqkZIUyQoRqeGqz5ubG1phrdEc2jfD+u3zVz3cvoBRRa+wXo1LITdMBvhu o+zkEuO+Kgscp1bX492aKabKJ2faXZ8zP/MeTq74bvyfZTGIHmoSGt77ptWeqf0w DNZCzxS4tG5R8qlrFnpxNtOpyUGUU4sLqinuh/NbmcZIKzv1S9izcq+8X0IsrBq2 4Y8+SGCHBTjZXIISWReAvHC0urLSAw== =WZbE -----END PGP SIGNATURE----- --RMdWOKqZmxKwB+oz--