From nobody Tue Feb 10 06:04:55 2026 Delivered-To: importer@patchew.org Received-SPF: pass (zoho.com: domain of gnu.org designates 208.118.235.17 as permitted sender) client-ip=208.118.235.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Authentication-Results: mx.zohomail.com; spf=pass (zoho.com: domain of gnu.org designates 208.118.235.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org Return-Path: Received: from lists.gnu.org (lists.gnu.org [208.118.235.17]) by mx.zohomail.com with SMTPS id 1507117412289555.6967537947888; Wed, 4 Oct 2017 04:43:32 -0700 (PDT) Received: from localhost ([::1]:34527 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1dzi5I-00024c-Kl for importer@patchew.org; Wed, 04 Oct 2017 07:43:28 -0400 Received: from eggs.gnu.org ([2001:4830:134:3::10]:41600) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1dzi2P-0000Ho-QV for qemu-devel@nongnu.org; Wed, 04 Oct 2017 07:40:30 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1dzi2O-0005m7-QI for qemu-devel@nongnu.org; Wed, 04 Oct 2017 07:40:29 -0400 Received: from mx1.redhat.com ([209.132.183.28]:52408) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1dzi2O-0005kP-E9 for qemu-devel@nongnu.org; Wed, 04 Oct 2017 07:40:28 -0400 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 76F37267DB for ; Wed, 4 Oct 2017 11:40:27 +0000 (UTC) Received: from t460.redhat.com (unknown [10.33.36.100]) by smtp.corp.redhat.com (Postfix) with ESMTP id 32D346268E; Wed, 4 Oct 2017 11:40:26 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mx1.redhat.com 76F37267DB Authentication-Results: ext-mx06.extmail.prod.ext.phx2.redhat.com; dmarc=none (p=none dis=none) header.from=redhat.com Authentication-Results: ext-mx06.extmail.prod.ext.phx2.redhat.com; spf=fail smtp.mailfrom=berrange@redhat.com From: "Daniel P. Berrange" To: qemu-devel@nongnu.org Date: Wed, 4 Oct 2017 12:40:08 +0100 Message-Id: <20171004114008.14849-3-berrange@redhat.com> In-Reply-To: <20171004114008.14849-1-berrange@redhat.com> References: <20171004114008.14849-1-berrange@redhat.com> 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]); Wed, 04 Oct 2017 11:40:27 +0000 (UTC) X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] [fuzzy] X-Received-From: 209.132.183.28 Subject: [Qemu-devel] [PATCH v1 2/2] ide: support reporting of rotation rate 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: Paolo Bonzini , John Snow Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail: RSF_0 Z_629925259 SPT_0 Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" The Linux kernel will query the ATA IDENTITY DEVICE data, word 217 to determine the rotations per minute of the disk. If this has the value 1, it is taken to be an SSD and so Linux sets the 'rotational' flag to 0 for the I/O queue and will stop using that disk as a source of random entropy. Other operating systems may also take into account rotation rate when setting up default behaviour. Mgmt apps should be able to set the rotation rate for virtualized block devices, based on characteristics of the host storage in use, so that the guest OS gets sensible behaviour out of the box. This patch thus adds a 'rotation-rate' parameter for 'ide-hd' device types. Signed-off-by: Daniel P. Berrange Reviewed-by: John Snow --- hw/ide/core.c | 1 + hw/ide/qdev.c | 1 + include/hw/ide/internal.h | 8 ++++++++ 3 files changed, 10 insertions(+) diff --git a/hw/ide/core.c b/hw/ide/core.c index 5f1cd3b91f..a04766aee7 100644 --- a/hw/ide/core.c +++ b/hw/ide/core.c @@ -208,6 +208,7 @@ static void ide_identify(IDEState *s) if (dev && dev->conf.discard_granularity) { put_le16(p + 169, 1); /* TRIM support */ } + put_le16(p + 217, dev->rotation_rate); /* Nominal media rotation rate = */ =20 ide_identify_size(s); s->identify_set =3D 1; diff --git a/hw/ide/qdev.c b/hw/ide/qdev.c index d60ac25be0..a5181b4448 100644 --- a/hw/ide/qdev.c +++ b/hw/ide/qdev.c @@ -299,6 +299,7 @@ static Property ide_hd_properties[] =3D { DEFINE_BLOCK_CHS_PROPERTIES(IDEDrive, dev.conf), DEFINE_PROP_BIOS_CHS_TRANS("bios-chs-trans", IDEDrive, dev.chs_trans, BIOS_ATA_TRANSLATION_AUTO), + DEFINE_PROP_UINT16("rotation_rate", IDEDrive, dev.rotation_rate, 0), DEFINE_PROP_END_OF_LIST(), }; =20 diff --git a/include/hw/ide/internal.h b/include/hw/ide/internal.h index e641012b48..31851b44d1 100644 --- a/include/hw/ide/internal.h +++ b/include/hw/ide/internal.h @@ -508,6 +508,14 @@ struct IDEDevice { char *serial; char *model; uint64_t wwn; + /* + * 0x0000 - rotation rate not reported + * 0x0001 - non-rotating medium (SSD) + * 0x0002-0x0400 - reserved + * 0x0401-0xffe - rotations per minute + * 0xffff - reserved + */ + uint16_t rotation_rate; }; =20 /* These are used for the error_status field of IDEBus */ --=20 2.13.5