From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751722AbaHROjv (ORCPT ); Mon, 18 Aug 2014 10:39:51 -0400 Received: from mx1.redhat.com ([209.132.183.28]:7876 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750906AbaHROjt (ORCPT ); Mon, 18 Aug 2014 10:39:49 -0400 Message-ID: <53F2101C.4090707@redhat.com> Date: Mon, 18 Aug 2014 16:39:24 +0200 From: Paolo Bonzini User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Thunderbird/24.7.0 MIME-Version: 1.0 To: Nadav Amit , Wanpeng Li CC: Nadav Amit , "gleb@kernel.org" , "tglx@linutronix.de" , "mingo@redhat.com" , "hpa@zytor.com" , "x86@kernel.org" , "linux-kernel@vger.kernel.org" , "kvm@vger.kernel.org" Subject: Re: [PATCH] KVM: x86: Increase the number of fixed MTRR regs to 10 References: <1403101279-23759-1-git-send-email-namit@cs.technion.ac.il> <20140818021715.GA7019@kernel> <20140818081115.GA26307@kernel> In-Reply-To: Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Il 18/08/2014 16:31, Nadav Amit ha scritto: > The cause for the blue-screen appears to be seabios, which leaves only 0x20 slots for “smp_mtrr”s. > Apparently, the increase in the variable range MTRR count caused it to exhaust the available slots. > As a result, some MSRs are not initialised by the BIOS (specifically, 3.5-4GB are not marked as UC), and cause Windows to panic. > > Once we increase the size of the array smp_mtrr in seabios, Windows boots. > > Paolo, you may wish to revert the patch. Please note that it was applied to some stable branches. Thanks. I'll post a patch to SeaBIOS too, since this should happen on bare metal too. Paolo