Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753808AbZF3Sog (ORCPT ); Tue, 30 Jun 2009 14:44:36 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752716AbZF3So1 (ORCPT ); Tue, 30 Jun 2009 14:44:27 -0400 Received: from mail-yx0-f188.google.com ([209.85.210.188]:40630 "EHLO mail-yx0-f188.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752223AbZF3So1 (ORCPT ); Tue, 30 Jun 2009 14:44:27 -0400 DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :cc:content-type:content-transfer-encoding; b=qFCmwHU1M5Y4mMa4WfplKWsezrtVzxVrV6bE9VfMuHNXgfVu+FlmkiV9XT6SJYwMVo NiD8rYoWfb5x5EfijD8IWPv3xLb7zAAqYYF/aRd7CGcNlJfVD71pRCbxjA0rEq01laEy awtRyrrdQNyLHlLTGqDJ/RZMA+keyWwcVh95g= MIME-Version: 1.0 In-Reply-To: <20090630075457.GH20289@redhat.com> References: <20090630064515.GG20289@redhat.com> <86802c440906300018p8c5156dy3e8d84b8c263797e@mail.gmail.com> <20090630075457.GH20289@redhat.com> Date: Tue, 30 Jun 2009 11:43:41 -0700 Message-ID: <86802c440906301143s14d0cc9ej9b666271a1ce15ba@mail.gmail.com> Subject: Re: [PATCH v4] enable x2APIC without interrupt remapping under KVM From: Yinghai Lu To: Gleb Natapov , "Eric W. Biederman" , Vivek Goyal Cc: linux-kernel@vger.kernel.org, Suresh Siddha , Sheng Yang , "kvm@vger.kernel.org" , "avi@redhat.com" Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 852 Lines: 26 2009/6/30 Gleb Natapov : >> >> how about kexec second kernel in KVM ? >> >> x2apic_preenabled will be set in second kernel. >> > Yes, bummer. But the similar problem exist now and without KVM. After > running x2apic enabled kernel you can't kexec kernel without x2apic > support. if the first kernel enable x2apic and intr_remapping, and second kernel has x2apic and intr_remap support. we can kexec the second kernel. restoring to original state is not possible for kdump case. maybe with minor change to your patch, you could kexec the in kexec second kernel with x2apic support. YH -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/