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 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 smtp.lore.kernel.org (Postfix) with ESMTPS id 982C2C7EE22 for ; Tue, 9 May 2023 09:20:46 +0000 (UTC) Received: from list by lists.xenproject.org with outflank-mailman.532049.828021 (Exim 4.92) (envelope-from ) id 1pwJW8-0004EI-Fy; Tue, 09 May 2023 09:20:20 +0000 X-Outflank-Mailman: Message body and most headers restored to incoming version Received: by outflank-mailman (output) from mailman id 532049.828021; Tue, 09 May 2023 09:20:20 +0000 Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1pwJW8-0004EB-C3; Tue, 09 May 2023 09:20:20 +0000 Received: by outflank-mailman (input) for mailman id 532049; Tue, 09 May 2023 09:20:19 +0000 Received: from se1-gles-flk1-in.inumbo.com ([94.247.172.50] helo=se1-gles-flk1.inumbo.com) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1pwJW6-0004E5-Vl for xen-devel@lists.xenproject.org; Tue, 09 May 2023 09:20:18 +0000 Received: from mx01.omp.ru (mx01.omp.ru [90.154.21.10]) by se1-gles-flk1.inumbo.com (Halon) with ESMTPS id b540e484-ee4a-11ed-8611-37d641c3527e; Tue, 09 May 2023 11:20:16 +0200 (CEST) Received: from [192.168.1.103] (178.176.73.203) by msexch01.omp.ru (10.188.4.12) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384) id 15.2.986.14; Tue, 9 May 2023 12:20:06 +0300 X-BeenThere: xen-devel@lists.xenproject.org List-Id: Xen developer discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: xen-devel-bounces@lists.xenproject.org Precedence: list Sender: "Xen-devel" X-Inumbo-ID: b540e484-ee4a-11ed-8611-37d641c3527e Subject: Re: [patch v3 33/36] x86/apic: Save the APIC virtual base address To: Thomas Gleixner , LKML CC: , David Woodhouse , Andrew Cooper , Brian Gerst , Arjan van de Veen , Paolo Bonzini , Paul McKenney , Tom Lendacky , Sean Christopherson , Oleksandr Natalenko , Paul Menzel , "Guilherme G. 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Bottomley" , Helge Deller , , Paul Walmsley , Palmer Dabbelt , , Mark Rutland , Sabin Rapan , "Michael Kelley (LINUX)" References: <20230508181633.089804905@linutronix.de> <20230508185219.070274100@linutronix.de> From: Sergey Shtylyov Organization: Open Mobile Platform Message-ID: Date: Tue, 9 May 2023 12:20:06 +0300 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.10.1 MIME-Version: 1.0 In-Reply-To: <20230508185219.070274100@linutronix.de> Content-Type: text/plain; charset="utf-8" Content-Language: en-US Content-Transfer-Encoding: 7bit X-Originating-IP: [178.176.73.203] X-ClientProxiedBy: msexch01.omp.ru (10.188.4.12) To msexch01.omp.ru (10.188.4.12) X-KSE-ServerInfo: msexch01.omp.ru, 9 X-KSE-AntiSpam-Interceptor-Info: scan successful X-KSE-AntiSpam-Version: 5.9.59, Database issued on: 05/09/2023 08:58:12 X-KSE-AntiSpam-Status: KAS_STATUS_NOT_DETECTED X-KSE-AntiSpam-Method: none X-KSE-AntiSpam-Rate: 59 X-KSE-AntiSpam-Info: Lua profiles 177218 [May 07 2023] X-KSE-AntiSpam-Info: Version: 5.9.59.0 X-KSE-AntiSpam-Info: Envelope from: s.shtylyov@omp.ru X-KSE-AntiSpam-Info: LuaCore: 510 510 bc345371020d3ce827abc4c710f5f0ecf15eaf2e X-KSE-AntiSpam-Info: {rep_avail} X-KSE-AntiSpam-Info: {Tracking_from_domain_doesnt_match_to} X-KSE-AntiSpam-Info: {relay has no DNS name} X-KSE-AntiSpam-Info: {SMTP from is not routable} X-KSE-AntiSpam-Info: {Found in DNSBL: 178.176.73.203 in (user) b.barracudacentral.org} X-KSE-AntiSpam-Info: {Found in DNSBL: 178.176.73.203 in (user) dbl.spamhaus.org} X-KSE-AntiSpam-Info: 178.176.73.203:7.4.1,7.7.3;d41d8cd98f00b204e9800998ecf8427e.com:7.1.1;omp.ru:7.1.1;127.0.0.199:7.1.2 X-KSE-AntiSpam-Info: {iprep_blacklist} X-KSE-AntiSpam-Info: ApMailHostAddress: 178.176.73.203 X-KSE-AntiSpam-Info: {DNS response errors} X-KSE-AntiSpam-Info: Rate: 59 X-KSE-AntiSpam-Info: Status: not_detected X-KSE-AntiSpam-Info: Method: none X-KSE-AntiSpam-Info: Auth:dmarc=temperror header.from=omp.ru;spf=temperror smtp.mailfrom=omp.ru;dkim=none X-KSE-Antiphishing-Info: Clean X-KSE-Antiphishing-ScanningType: Heuristic X-KSE-Antiphishing-Method: None X-KSE-Antiphishing-Bases: 05/09/2023 09:07:00 X-KSE-Antivirus-Interceptor-Info: scan successful X-KSE-Antivirus-Info: Clean, bases: 5/9/2023 6:00:00 AM X-KSE-Attachment-Filter-Triggered-Rules: Clean X-KSE-Attachment-Filter-Triggered-Filters: Clean X-KSE-BulkMessagesFiltering-Scan-Result: InTheLimit Hello! On 5/8/23 10:44 PM, Thomas Gleixner wrote: > From: Thomas Gleixner > > For parallel CPU brinugp it's required to read the APIC ID in the low level > startup code. The virtual APIC base address is a constant because its a > fix-mapped address. Exposing that constant which is composed via macros to > assembly code is non-trivial dues to header inclusion hell. s/dues/due/? > Aside of that it's constant only because of the vsyscall ABI > requirement. Once vsyscall is out of the picture the fixmap can be placed > at runtime. > > Avoid header hell, stay flexible and store the address in a variable which > can be exposed to the low level startup code. > > Signed-off-by: Thomas Gleixner > Tested-by: Michael Kelley [...] MBR, Sergey