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=-2.3 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 autolearn=no 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 8F05EC83003 for ; Wed, 29 Apr 2020 13:29:29 +0000 (UTC) Received: from lists.xenproject.org (lists.xenproject.org [192.237.175.120]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 65A072085B for ; Wed, 29 Apr 2020 13:29:28 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 65A072085B Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=suse.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=xen-devel-bounces@lists.xenproject.org Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1jTmm6-0008R0-3l; Wed, 29 Apr 2020 13:29:18 +0000 Received: from all-amaz-eas1.inumbo.com ([34.197.232.57] helo=us1-amaz-eas2.inumbo.com) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1jTmm4-0008Qv-Ak for xen-devel@lists.xenproject.org; Wed, 29 Apr 2020 13:29:16 +0000 X-Inumbo-ID: 6ba63afc-8a1d-11ea-9949-12813bfff9fa Received: from mx2.suse.de (unknown [195.135.220.15]) by us1-amaz-eas2.inumbo.com (Halon) with ESMTPS id 6ba63afc-8a1d-11ea-9949-12813bfff9fa; Wed, 29 Apr 2020 13:29:15 +0000 (UTC) X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay2.suse.de (unknown [195.135.220.254]) by mx2.suse.de (Postfix) with ESMTP id 166B5ABD0; Wed, 29 Apr 2020 13:29:14 +0000 (UTC) Subject: Re: [PATCH 2/3] x86/pv: Short-circuit is_pv_{32,64}bit_domain() in !CONFIG_PV32 builds To: Andrew Cooper References: <20200417155004.16806-1-andrew.cooper3@citrix.com> <20200417155004.16806-3-andrew.cooper3@citrix.com> <9b721f94-92de-8d23-b9a4-fdaae13aec38@suse.com> <0300a420-2979-d788-c158-12d580e412ee@citrix.com> From: Jan Beulich Message-ID: <128b382e-e601-d09f-95de-fa9f7b0b2318@suse.com> Date: Wed, 29 Apr 2020 15:29:13 +0200 User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:68.0) Gecko/20100101 Thunderbird/68.7.0 MIME-Version: 1.0 In-Reply-To: <0300a420-2979-d788-c158-12d580e412ee@citrix.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit X-BeenThere: xen-devel@lists.xenproject.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Xen developer discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Cc: Xen-devel , Wei Liu , =?UTF-8?Q?Roger_Pau_Monn=c3=a9?= Errors-To: xen-devel-bounces@lists.xenproject.org Sender: "Xen-devel" On 29.04.2020 15:13, Andrew Cooper wrote: > On 20/04/2020 15:09, Jan Beulich wrote: >> On 17.04.2020 17:50, Andrew Cooper wrote: >>> --- a/xen/arch/x86/pv/domain.c >>> +++ b/xen/arch/x86/pv/domain.c >>> @@ -215,7 +215,7 @@ int switch_compat(struct domain *d) >>> return 0; >>> >>> d->arch.has_32bit_shinfo = 1; >>> - d->arch.is_32bit_pv = 1; >>> + d->arch.pv.is_32bit = 1; >>> >>> for_each_vcpu( d, v ) >>> { >>> @@ -235,7 +235,7 @@ int switch_compat(struct domain *d) >>> return 0; >>> >>> undo_and_fail: >>> - d->arch.is_32bit_pv = d->arch.has_32bit_shinfo = 0; >>> + d->arch.pv.is_32bit = d->arch.has_32bit_shinfo = 0; >>> for_each_vcpu( d, v ) >>> { >>> free_compat_arg_xlat(v); >>> @@ -358,7 +358,7 @@ int pv_domain_initialise(struct domain *d) >>> d->arch.ctxt_switch = &pv_csw; >>> >>> /* 64-bit PV guest by default. */ >>> - d->arch.is_32bit_pv = d->arch.has_32bit_shinfo = 0; >>> + d->arch.pv.is_32bit = d->arch.has_32bit_shinfo = 0; >> Switch to true/false while you're touching these? > > Yes, but I'm tempted to delete these lines in the final hunk.  Its > writing zeros into a zeroed structures. Oh, yes, agreed. Jan