From nobody Mon Feb 9 09:34:28 2026 Delivered-To: importer@patchew.org Received-SPF: pass (zoho.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; Authentication-Results: mx.zohomail.com; dkim=fail; spf=pass (zoho.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=1573841453; cv=none; d=zoho.com; s=zohoarc; b=Eenx0V/fAfQCVVVBvRNXFKpjhiWiY8t1Uu3ciXaBzTHTqcpsjvwm19kGZah1x3et9QPngV3y+t9HuwlCLjE/UjhHmJOVHVmaeXxJKgNay06uKMJOoV12ZVEn6K5lCJ/a/oz4hQFzmVZEATFEHIlayQCT8hP02kntyXXS+AEa/o0= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zoho.com; s=zohoarc; t=1573841453; h=Content-Type:Content-Transfer-Encoding:Cc:Date:From:In-Reply-To:List-Subscribe:List-Post:List-Id:List-Archive:List-Help:List-Unsubscribe:Message-ID:References:Sender:Subject:To; bh=Uzo0IBZEfDDnEOirdnitakwDJQ8L2Q9b7cQMpd1dxN0=; b=jCBHuR4qJGEhMBdiT2TIFQ7DkuQ6M86CTHlYX1549yMKE7GdFlJ1lK8zIdqQnIdCwkFEle9/whUz41s+RpmSACkTWiIKli8I8bMEw3cYoTy8bILtcgzGIGoyZxrDlIsbLsMCDVPCRDsw2MPAhWYizuXGuoGPyYr6IuTjKW6kKgo= ARC-Authentication-Results: i=1; mx.zoho.com; dkim=fail; spf=pass (zoho.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 1573841453817585.4352438003676; Fri, 15 Nov 2019 10:10:53 -0800 (PST) Received: from localhost ([::1]:44138 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1iVg3Y-0002P5-KR for importer@patchew.org; Fri, 15 Nov 2019 13:10:52 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]:45793) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1iVg1U-0000bL-W3 for qemu-devel@nongnu.org; Fri, 15 Nov 2019 13:08:45 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1iVg1T-00023r-WA for qemu-devel@nongnu.org; Fri, 15 Nov 2019 13:08:44 -0500 Received: from us-smtp-1.mimecast.com ([205.139.110.61]:56349 helo=us-smtp-delivery-1.mimecast.com) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1iVg1T-00023X-SE for qemu-devel@nongnu.org; Fri, 15 Nov 2019 13:08:43 -0500 Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-284-R_Pc_wSbO9K5c7dMhdXmSw-1; Fri, 15 Nov 2019 13:08:40 -0500 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 mimecast-mx01.redhat.com (Postfix) with ESMTPS id 45D88801FD2; Fri, 15 Nov 2019 18:08:39 +0000 (UTC) Received: from virtlab501.virt.lab.eng.bos.redhat.com (virtlab501.virt.lab.eng.bos.redhat.com [10.19.152.162]) by smtp.corp.redhat.com (Postfix) with ESMTP id 7A1FE60557; Fri, 15 Nov 2019 18:08:38 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1573841323; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=Uzo0IBZEfDDnEOirdnitakwDJQ8L2Q9b7cQMpd1dxN0=; b=JZIoqmJYXIaUL7N7/cnfNPcrxUsb/nLl8zFOwI4nEo+xN0zVz+TG1dvhD6yC1Bhu8kguY3 lhaWNTLMrXYsPP4tAhwEX2asSK7LRqxV74LpjPU55Hig2+SqcPEsclVXAItaUs3QhBPrpm K49KceQPUU1sjGTXew9RkeND1/+bMdY= From: Wainer dos Santos Moschetta To: qemu-devel@nongnu.org Subject: [PATCH 3/4] python/qemu: accel: Strengthen kvm_available() checks Date: Fri, 15 Nov 2019 13:08:28 -0500 Message-Id: <20191115180829.10275-4-wainersm@redhat.com> In-Reply-To: <20191115180829.10275-1-wainersm@redhat.com> References: <20191115180829.10275-1-wainersm@redhat.com> X-Scanned-By: MIMEDefang 2.79 on 10.5.11.11 X-MC-Unique: R_Pc_wSbO9K5c7dMhdXmSw-1 X-Mimecast-Spam-Score: 0 Content-Transfer-Encoding: quoted-printable X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] [fuzzy] X-Received-From: 205.139.110.61 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: , Cc: fam@euphon.net, ehabkost@redhat.com, philmd@redhat.com, jsnow@redhat.com, crosa@redhat.com, alex.bennee@linaro.org Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: fail (Header signature does not verify) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Currently kvm_available() checks for the presence of kvm module and, if target and host arches don't mismatch. This patch adds an 3rd checking: if QEMU binary was compiled with kvm support. Signed-off-by: Wainer dos Santos Moschetta Reviewed-by: Alex Benn=C3=A9e --- python/qemu/accel.py | 27 +++++++++++++++++++++------ 1 file changed, 21 insertions(+), 6 deletions(-) diff --git a/python/qemu/accel.py b/python/qemu/accel.py index a63ff980a9..1978fbee4e 100644 --- a/python/qemu/accel.py +++ b/python/qemu/accel.py @@ -48,9 +48,24 @@ def list_accel(qemu_bin): # Skip the first line which is the header. return [l.strip() for l in lines[1:] if l] =20 -def kvm_available(target_arch=3DNone): - host_arch =3D os.uname()[4] - if target_arch and target_arch !=3D host_arch: - if target_arch !=3D ADDITIONAL_ARCHES.get(host_arch): - return False - return os.access("/dev/kvm", os.R_OK | os.W_OK) +def kvm_available(target_arch=3DNone, qemu_bin=3DNone): + """ + Check if KVM is available using the following heuristic: + - Kernel module is present in the host; + - Target and host arches don't mismatch; + - KVM is enabled in the QEMU binary. + + @param target_arch (str): target architecture + @param qemu_bin (str): path to the QEMU binary + @return True if kvm is available, otherwise False. + """ + if not os.access("/dev/kvm", os.R_OK | os.W_OK): + return False + if target_arch: + host_arch =3D os.uname()[4] + if target_arch !=3D host_arch: + if target_arch !=3D ADDITIONAL_ARCHES.get(host_arch): + return False + if qemu_bin and "kvm" not in list_accel(qemu_bin): + return False + return True --=20 2.18.1