From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:52003) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1VeSgu-0006E2-9S for qemu-devel@nongnu.org; Thu, 07 Nov 2013 11:44:26 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1VeSgo-0003Ea-91 for qemu-devel@nongnu.org; Thu, 07 Nov 2013 11:44:20 -0500 Received: from mx1.redhat.com ([209.132.183.28]:45859) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1VeSgo-0003EU-16 for qemu-devel@nongnu.org; Thu, 07 Nov 2013 11:44:14 -0500 Received: from int-mx12.intmail.prod.int.phx2.redhat.com (int-mx12.intmail.prod.int.phx2.redhat.com [10.5.11.25]) by mx1.redhat.com (8.14.4/8.14.4) with ESMTP id rA7GiC5D002685 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=OK) for ; Thu, 7 Nov 2013 11:44:13 -0500 Date: Thu, 7 Nov 2013 18:47:05 +0200 From: "Michael S. Tsirkin" Message-ID: <20131107164705.GA4572@redhat.com> References: <1383840877-2861-1-git-send-email-pbonzini@redhat.com> <20131107162131.GA4370@redhat.com> <527BBFDB.2010404@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <527BBFDB.2010404@redhat.com> Subject: Re: [Qemu-devel] [PATCH 0/2] exec: alternative fix for master abort woes List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Paolo Bonzini Cc: marcel.a@redhat.com, qemu-devel@nongnu.org, lcapitulino@redhat.com On Thu, Nov 07, 2013 at 05:29:15PM +0100, Paolo Bonzini wrote: > Il 07/11/2013 17:21, Michael S. Tsirkin ha scritto: > >> > This fixes the problems with the misalignment of the master abort region. > >> > See patch 2 for details, patch 1 is just a preparatory search-and-replace > >> > patch. > >> > > >> > Paolo Bonzini (2): > >> > split definitions for exec.c and translate-all.c radix trees > >> > exec: make address spaces 64-bit wide > > Can you please share info on testing you did? > > > > "make check", booting a RHEL guest with both KVM and TCG, Luiz's gdb > crash. I also ran vmexit.flat from kvm-unit-tests and checked that > there was no measurable slowdown. > > Paolo That's on kvm with 52 bit address. But where I would be concerned is systems with e.g. 36 bit address space where we are doubling the cost of the lookup. E.g. try i386 and not x86_64. -- But