From nobody Tue Feb 10 00:24:55 2026 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; dkim=fail; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=fail(p=none dis=none) header.from=redhat.com ARC-Seal: i=1; a=rsa-sha256; t=1621500031; cv=none; d=zohomail.com; s=zohoarc; b=jE8R4tEUWpuQQMQk1fv4E6mBa5RPDEVG3yb8HAg2Kq7WBUT9zTRunmE1auOXnyoU3LKdIJitYxhKRtoBKNsxxL99AzPO0UkXIoClJ4seo7mF/3k8iOnbwpERRqRmEAlJdL82wUwtyIyMVgoMzXVXAvjFg5yL0pR3av3077wshr0= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1621500031; h=Content-Transfer-Encoding:Date:From:In-Reply-To:List-Subscribe:List-Post:List-Id:List-Archive:List-Help:List-Unsubscribe:MIME-Version:Message-ID:References:Sender:Subject:To; bh=mfZamIf15Ke/BeRA5FMstz0DDkSoart1dVqPlrNSeDc=; b=WnlsB9xwusKw93LzNQp0xeZQdHE5q8n4LR14CgtdtJ2eYenCuYcbC96Wrb/bl5Vw55K4UxE9WZM8yljTrdhDhxoZt53aTtRkFGrJq1MpJUzZalpni7BiShgwGK7jOR98DhB7qT3pwKk2J0DL7ARletFbiABwnqV5UfmyZ5AZLX8= ARC-Authentication-Results: i=1; mx.zohomail.com; dkim=fail; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=fail header.from= (p=none dis=none) header.from= Return-Path: Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) by mx.zohomail.com with SMTPS id 1621500031698377.34154137175483; Thu, 20 May 2021 01:40:31 -0700 (PDT) Received: from localhost ([::1]:54256 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1ljeEI-0006K8-Is for importer@patchew.org; Thu, 20 May 2021 04:40:30 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:50572) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1ljdxj-0005RI-98 for qemu-devel@nongnu.org; Thu, 20 May 2021 04:23:29 -0400 Received: from mail-wr1-x435.google.com ([2a00:1450:4864:20::435]:39932) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1ljdxe-0001bZ-W4 for qemu-devel@nongnu.org; Thu, 20 May 2021 04:23:22 -0400 Received: by mail-wr1-x435.google.com with SMTP id v12so16673106wrq.6 for ; Thu, 20 May 2021 01:23:16 -0700 (PDT) Received: from avogadro.redhat.com ([2001:b07:6468:f312:c8dd:75d4:99ab:290a]) by smtp.gmail.com with ESMTPSA id v10sm2603506wrq.0.2021.05.20.01.23.14 for (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 20 May 2021 01:23:15 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=sender:from:to:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=mfZamIf15Ke/BeRA5FMstz0DDkSoart1dVqPlrNSeDc=; b=I1RxqJIAGCZETtJiQ3/FCP+aDY4XqtU0xy6PW9CzitxLHzkV3HmMTVRJSQRLPTQIGR keL6aGjv+2IPQ0Q6IrDAdmsuweMcaeKNyReE3M84HQD6WssSwF1Estp+YqUyWKQ7+HxO sO/lhmalHGEK/osf+UNx8rV08+oSfNy1lSl2QvgNiyokqZ0lhluLqJE7CiV+vnTtVICC qtUIrI9cfn2PfmN+ccu1XSOUviDpjbvldqpl+CRgkUorC9DDt2pVpziSoBSx4JENcTtA JcJyWQdAVBcX1ppt5fUBWDX+yuY+V1Muzs1sKyhqMxPTFz5Mg2VTvN0BoKJMDK2aaUBa 10Rg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:sender:from:to:subject:date:message-id :in-reply-to:references:mime-version:content-transfer-encoding; bh=mfZamIf15Ke/BeRA5FMstz0DDkSoart1dVqPlrNSeDc=; b=MJHJa1YKP4JecaWTCvo9uvyqzeaf3g8bE3T3Q/NkGh6jowVHphnJP6b1nY7c4EXjVJ +E5In56HQxRksR7dcvd9syWFIToqpBeHLvO+X09g9/DLcnA5ed5z3Vn3b74RI8ptLK+b dNAZbtZ+nuvPdfqL53b1TlarUH4DopJ+yC7528MmfhQXjQdDxQZ7DMCZa6SVOA2PvHMS XuKcSSuzfpAr9mUa5QXM6DajQaTkCAEZmkwMeKy+HpmkLxNuyGVsWyy/z0F8vHNFGA+u jLSUgINYeOuwai9xMhqUPnvkUF2NoyzieXmQysdBY3KXZZvd2PWU6BArBkSrKYwzeiUm PPgg== X-Gm-Message-State: AOAM533NHUWFQEZs8EDuYcMGdXBMmBwO0E0E5BQEgM1Ai/K+h6zQLs/d ZKauFdCFsqqA0NTtRj06C5eO7DyL1v4NwQ== X-Google-Smtp-Source: ABdhPJyCdQRDXg2SyeudYiC9s8IxLwanuBspulh9+FnW9YDj6zADI0veQyqLhC1npaiPbLQjbhOKqw== X-Received: by 2002:adf:b64b:: with SMTP id i11mr2998959wre.157.1621498995569; Thu, 20 May 2021 01:23:15 -0700 (PDT) From: Paolo Bonzini To: qemu-devel@nongnu.org Subject: [PULL 26/26] scsi-generic: pass max_segments via max_iov field in BlockLimits Date: Thu, 20 May 2021 10:22:57 +0200 Message-Id: <20210520082257.187061-27-pbonzini@redhat.com> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20210520082257.187061-1-pbonzini@redhat.com> References: <20210520082257.187061-1-pbonzini@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=2a00:1450:4864:20::435; envelope-from=paolo.bonzini@gmail.com; helo=mail-wr1-x435.google.com X-Spam_score_int: -14 X-Spam_score: -1.5 X-Spam_bar: - X-Spam_report: (-1.5 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FORGED_FROMDOMAIN=0.25, FREEMAIL_FROM=0.001, HEADER_FROM_DIFFERENT_DOMAINS=0.25, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=no autolearn_force=no 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: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: fail (Header signature does not verify) Content-Type: text/plain; charset="utf-8" I/O to a disk via read/write is not limited by the number of segments allow= ed by the host adapter; the kernel can split requests if needed, and the limit imposed by the host adapter can be very low (256k or so) to avoid that SG_IO returns EINVAL if memory is heavily fragmented. Since this value is only interesting for SG_IO-based I/O, do not include it in the max_transfer and only take it into account when patching the block limits VPD page in the scsi-generic device. Signed-off-by: Paolo Bonzini --- block/file-posix.c | 3 +-- hw/scsi/scsi-generic.c | 6 ++++-- 2 files changed, 5 insertions(+), 4 deletions(-) diff --git a/block/file-posix.c b/block/file-posix.c index 10b71d9a13..59c889d5a7 100644 --- a/block/file-posix.c +++ b/block/file-posix.c @@ -1228,8 +1228,7 @@ static void raw_refresh_limits(BlockDriverState *bs, = Error **errp) =20 ret =3D sg_get_max_segments(s->fd); if (ret > 0) { - bs->bl.max_transfer =3D MIN(bs->bl.max_transfer, - ret * qemu_real_host_page_size); + bs->bl.max_iov =3D ret; } } =20 diff --git a/hw/scsi/scsi-generic.c b/hw/scsi/scsi-generic.c index 98c30c5d5c..82e1e2ee79 100644 --- a/hw/scsi/scsi-generic.c +++ b/hw/scsi/scsi-generic.c @@ -179,10 +179,12 @@ static void scsi_handle_inquiry_reply(SCSIGenericReq = *r, SCSIDevice *s) (r->req.cmd.buf[1] & 0x01)) { page =3D r->req.cmd.buf[2]; if (page =3D=3D 0xb0) { - uint32_t max_transfer =3D - blk_get_max_transfer(s->conf.blk) / s->blocksize; + uint32_t max_transfer =3D blk_get_max_transfer(s->conf.blk); + uint32_t max_iov =3D blk_get_max_iov(s->conf.blk); =20 assert(max_transfer); + max_transfer =3D MIN_NON_ZERO(max_transfer, max_iov * qemu_rea= l_host_page_size) + / s->blocksize; stl_be_p(&r->buf[8], max_transfer); /* Also take care of the opt xfer len. */ stl_be_p(&r->buf[12], --=20 2.31.1