From patchwork Fri Feb 26 13:59:27 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Igor Mammedov X-Patchwork-Id: 8437191 Return-Path: X-Original-To: patchwork-qemu-devel@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork2.web.kernel.org (Postfix) with ESMTP id BE42FC0553 for ; Fri, 26 Feb 2016 14:02:03 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 2F12520259 for ; Fri, 26 Feb 2016 14:02:03 +0000 (UTC) Received: from lists.gnu.org (lists.gnu.org [208.118.235.17]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 842912021B for ; Fri, 26 Feb 2016 14:02:02 +0000 (UTC) Received: from localhost ([::1]:49958 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1aZIy1-0001il-Vd for patchwork-qemu-devel@patchwork.kernel.org; Fri, 26 Feb 2016 09:02:01 -0500 Received: from eggs.gnu.org ([2001:4830:134:3::10]:44854) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1aZIvt-0006yI-2x for qemu-devel@nongnu.org; Fri, 26 Feb 2016 08:59:49 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1aZIvq-0008Vy-SX for qemu-devel@nongnu.org; Fri, 26 Feb 2016 08:59:49 -0500 Received: from mx1.redhat.com ([209.132.183.28]:39186) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1aZIvq-0008Vs-ND for qemu-devel@nongnu.org; Fri, 26 Feb 2016 08:59:46 -0500 Received: from int-mx14.intmail.prod.int.phx2.redhat.com (int-mx14.intmail.prod.int.phx2.redhat.com [10.5.11.27]) by mx1.redhat.com (Postfix) with ESMTPS id 485258EA38 for ; Fri, 26 Feb 2016 13:59:46 +0000 (UTC) Received: from dell-r430-03.lab.eng.brq.redhat.com (dell-r430-03.lab.eng.brq.redhat.com [10.34.112.60]) by int-mx14.intmail.prod.int.phx2.redhat.com (8.14.4/8.14.4) with ESMTP id u1QDxVCx007250; Fri, 26 Feb 2016 08:59:45 -0500 From: Igor Mammedov To: qemu-devel@nongnu.org Date: Fri, 26 Feb 2016 14:59:27 +0100 Message-Id: <1456495168-144510-10-git-send-email-imammedo@redhat.com> In-Reply-To: <1456495168-144510-1-git-send-email-imammedo@redhat.com> References: <1456495168-144510-1-git-send-email-imammedo@redhat.com> X-Scanned-By: MIMEDefang 2.68 on 10.5.11.27 X-detected-operating-system: by eggs.gnu.org: GNU/Linux 3.x X-Received-From: 209.132.183.28 Cc: marcel@redhat.com, ehabkost@redhat.com, mst@redhat.com Subject: [Qemu-devel] [PATCH v4 09/10] pc: acpi: clarify why possible LAPIC entries must be present in MADT X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Sender: qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org X-Spam-Status: No, score=-6.9 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Signed-off-by: Igor Mammedov Reviewed-by: Eduardo Habkost --- hw/i386/acpi-build.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/hw/i386/acpi-build.c b/hw/i386/acpi-build.c index 48240e0..155198b 100644 --- a/hw/i386/acpi-build.c +++ b/hw/i386/acpi-build.c @@ -360,6 +360,12 @@ build_madt(GArray *table_data, GArray *linker, PCMachineState *pcms) if (apic_ids->cpus[i].cpu != NULL) { apic->flags = cpu_to_le32(1); } else { + /* ACPI spec says that LAPIC entry for non present + * CPU may be omitted from MADT or it must be marked + * as disabled. However omitting non present CPU from + * MADT breaks hotplug on linux. So possible CPUs + * should be put in MADT but kept disabled. + */ apic->flags = cpu_to_le32(0); } }