From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-2.5 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_MUTT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 1AB24C28CC0 for ; Thu, 30 May 2019 00:53:55 +0000 (UTC) Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id E59A5243B8 for ; Thu, 30 May 2019 00:53:54 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org E59A5243B8 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=redhat.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Received: from localhost ([127.0.0.1]:53898 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1hW9KL-0006gr-Um for qemu-devel@archiver.kernel.org; Wed, 29 May 2019 20:53:53 -0400 Received: from eggs.gnu.org ([209.51.188.92]:43469) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1hW9JV-0006OE-0c for qemu-devel@nongnu.org; Wed, 29 May 2019 20:53:01 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1hW9JU-0004rx-7C for qemu-devel@nongnu.org; Wed, 29 May 2019 20:53:00 -0400 Received: from mx1.redhat.com ([209.132.183.28]:35850) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1hW9JU-0004rI-22 for qemu-devel@nongnu.org; Wed, 29 May 2019 20:53:00 -0400 Received: from smtp.corp.redhat.com (int-mx02.intmail.prod.int.phx2.redhat.com [10.5.11.12]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 357E13086246; Thu, 30 May 2019 00:52:58 +0000 (UTC) Received: from xz-x1 (ovpn-12-21.pek2.redhat.com [10.72.12.21]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 6705460C75; Thu, 30 May 2019 00:52:55 +0000 (UTC) Date: Thu, 30 May 2019 08:52:43 +0800 From: Peter Xu To: Pavel Dovgalyuk Message-ID: <20190530005243.GA28587@xz-x1> References: <003a01d51611$6251a2b0$26f4e810$@ru> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <003a01d51611$6251a2b0$26f4e810$@ru> User-Agent: Mutt/1.10.1 (2018-07-13) X-Scanned-By: MIMEDefang 2.79 on 10.5.11.12 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.49]); Thu, 30 May 2019 00:52:58 +0000 (UTC) X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 209.132.183.28 Subject: Re: [Qemu-devel] i386: EFER vs 32-bit CPU X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: ehabkost@redhat.com, quintela@redhat.com, dgilbert@redhat.com, qemu-devel@nongnu.org, pbonzini@redhat.com, rth@twiddle.net Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On Wed, May 29, 2019 at 02:26:39PM +0300, Pavel Dovgalyuk wrote: > Hello! > > > > I found this while debugging the inconsistent saved/restored state of the virtual machine. > > > > i386 (32 bit) emulation uses this register (in wrmsr and in MMU fault processing). Sorry if this question is elementary, but... why would a 32bit guest use IA32_EFER? From SDM I only see 4 bits defined in this MSR (SCE, LME, LMA, NXE) but is there any of them that should be set in a 32bit guest? Regards, -- Peter Xu