From nobody Tue Feb 10 23:01:04 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 (208.118.235.17 [208.118.235.17]) by mx.zohomail.com with SMTPS id 1507326893565975.0351904176538; Fri, 6 Oct 2017 14:54:53 -0700 (PDT) Received: from localhost ([::1]:47262 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1e0aZu-0004rE-QL for importer@patchew.org; Fri, 06 Oct 2017 17:54:42 -0400 Received: from eggs.gnu.org ([2001:4830:134:3::10]:41904) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1e0aYA-0003pW-TM for qemu-devel@nongnu.org; Fri, 06 Oct 2017 17:52:55 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1e0aY9-0001YG-Jl for qemu-devel@nongnu.org; Fri, 06 Oct 2017 17:52:54 -0400 Received: from mx1.redhat.com ([209.132.183.28]:39306) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1e0aY9-0001X7-DU for qemu-devel@nongnu.org; Fri, 06 Oct 2017 17:52:53 -0400 Received: from smtp.corp.redhat.com (int-mx01.intmail.prod.int.phx2.redhat.com [10.5.11.11]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 65E0A85543 for ; Fri, 6 Oct 2017 21:52:52 +0000 (UTC) Received: from localhost (ovpn-116-25.gru2.redhat.com [10.97.116.25]) by smtp.corp.redhat.com (Postfix) with ESMTP id 19CA96047D; Fri, 6 Oct 2017 21:52:49 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mx1.redhat.com 65E0A85543 Authentication-Results: ext-mx04.extmail.prod.ext.phx2.redhat.com; dmarc=none (p=none dis=none) header.from=redhat.com Authentication-Results: ext-mx04.extmail.prod.ext.phx2.redhat.com; spf=fail smtp.mailfrom=ehabkost@redhat.com From: Eduardo Habkost To: qemu-devel@nongnu.org Date: Fri, 6 Oct 2017 18:52:38 -0300 Message-Id: <20171006215244.27104-2-ehabkost@redhat.com> In-Reply-To: <20171006215244.27104-1-ehabkost@redhat.com> References: <20171006215244.27104-1-ehabkost@redhat.com> X-Scanned-By: MIMEDefang 2.79 on 10.5.11.11 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.28]); Fri, 06 Oct 2017 21:52:52 +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 1/7] qemu-doc: Document minimum kernel version for KVM in x86_64 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 , Igor Mammedov , "Michael S. Tsirkin" 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 default set of KVM CPU features require the host kernel to support them. KVM_PV_EOI is the newest one, and was included on Linux v3.6 (Linux commit ae7a2a3f). Running on an old host might break management software expectations because the latest machine-type won't be runnable while older machine-types might be runnable. Document v3.6 as the minimum kernel version for KVM on x86_64. Signed-off-by: Eduardo Habkost --- qemu-doc.texi | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/qemu-doc.texi b/qemu-doc.texi index ecd186a159..be45b6b6f6 100644 --- a/qemu-doc.texi +++ b/qemu-doc.texi @@ -37,6 +37,7 @@ * QEMU System emulator for non PC targets:: * QEMU Guest Agent:: * QEMU User space emulator:: +* System requirements:: * Implementation notes:: * Deprecated features:: * License:: @@ -2348,6 +2349,14 @@ Act as if the host page size was 'pagesize' bytes Run the emulation in single step mode. @end table =20 +@node System requirements +@chapter System requirements + +@section KVM kernel module + +On x86_64 hosts, the default set of CPU features enabled by the KVM accele= rator +require the host to be running Linux v3.6 or newer. + =20 @include qemu-tech.texi =20 --=20 2.13.6