From patchwork Fri Jun 2 12:41:52 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Saurabh Singh Sengar X-Patchwork-Id: 102536 Return-Path: Delivered-To: ouuuleilei@gmail.com Received: by 2002:a59:994d:0:b0:3d9:f83d:47d9 with SMTP id k13csp1004501vqr; Fri, 2 Jun 2023 05:54:53 -0700 (PDT) X-Google-Smtp-Source: ACHHUZ7umJ219V8GUvPWAIKONWMADCYpGdsg8naT+rV5cl3qtuaGDhJjAxEcefwTFtBm/cvn+ZNS X-Received: by 2002:a17:903:2445:b0:1ad:bc86:851 with SMTP id l5-20020a170903244500b001adbc860851mr1372891pls.45.1685710493199; Fri, 02 Jun 2023 05:54:53 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1685710493; cv=none; d=google.com; s=arc-20160816; b=aYX21JAyYOFLV1WF8aAQWpoPACepcsBoAE1htfBwPiteW1al+Jd/L7tcLQjFuf86RK bx0B+YKWqDJqMy10Qg21OZjiL/5mo6iBa/3AOA4T3xZrkuiuosxuj3bFb5uFCOCNCAmu /nGYyTQ7L3Yved2cW3vKs8ekwHUwqRG5I+UncKDDqtSx9QdJGslSSOrthjYKRUyh+/f2 57ZEF/heN99d++LnizSottMnePA0eF1esqArFao/hXjklFrU9jGhPflSRYKywdx0PNFw sS2WtvJeOhwhhrwsDNx8OvB70DMENWauw04siicOJwMas23pUG6Xv1PBGpkiFdIqomEu PPaQ== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:message-id:date:subject:to:from:dkim-signature :dkim-filter; bh=CYFJLeDTCw3IfeJbOMeEsgxwh59MLlV9KXPjuDvd634=; b=dxCOXItA2ZzXRCVKPQn+jPkozrgq19eH3alDTWxcSwxPDGENgzcAfpZ8v9nILh7/qh ifUJ3KgIudh30/jmmcyosWfnCxHpgC2mZxG90iMBJxzf5zJjL4WRsvGDbymqK7B3b9l3 AF8A+1p/t/PnFTgXw4GqBGMCNujNDziQ9XfhLlNcsKzCLZDHUyJs7yfDivPtSKSUmUu+ L5SLYzQf53KNlupzBbghkEeV2SmHM97P/+q1aXGWV4gTCc4LGLW/KjIOL0hFwIeG91SM A3OFSTQCfxJdRvtsVWrMz/TxWe7dV8hkkD7MlixAkK/39/QRJRxZn4XQhuoeKXt6yHFr ULgQ== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@linux.microsoft.com header.s=default header.b=QNWh05LZ; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=linux.microsoft.com Received: from out1.vger.email (out1.vger.email. [2620:137:e000::1:20]) by mx.google.com with ESMTP id u8-20020a170902e5c800b001a51c26f601si829275plf.627.2023.06.02.05.54.39; Fri, 02 Jun 2023 05:54:53 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20; Authentication-Results: mx.google.com; dkim=pass header.i=@linux.microsoft.com header.s=default header.b=QNWh05LZ; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=linux.microsoft.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235397AbjFBMl7 (ORCPT + 99 others); Fri, 2 Jun 2023 08:41:59 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:43942 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234114AbjFBMl5 (ORCPT ); Fri, 2 Jun 2023 08:41:57 -0400 Received: from linux.microsoft.com (linux.microsoft.com [13.77.154.182]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id 022DB13D; Fri, 2 Jun 2023 05:41:57 -0700 (PDT) Received: from linuxonhyperv3.guj3yctzbm1etfxqx2vob5hsef.xx.internal.cloudapp.net (linux.microsoft.com [13.77.154.182]) by linux.microsoft.com (Postfix) with ESMTPSA id 73F1220FCD4F; Fri, 2 Jun 2023 05:41:56 -0700 (PDT) DKIM-Filter: OpenDKIM Filter v2.11.0 linux.microsoft.com 73F1220FCD4F DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.microsoft.com; s=default; t=1685709716; bh=CYFJLeDTCw3IfeJbOMeEsgxwh59MLlV9KXPjuDvd634=; h=From:To:Subject:Date:From; b=QNWh05LZTGEW/x9oPwlqDErkIN87ieDHA0LavFn/+ysV5pa9mqnXGeiY9QcALniin thoDpCsIDq4pYx0+uHtHYoCxpyFTSS2icS6cpyTFCW601u+SpVA3C2Sbx/Xa1A6gAJ fzztPhIbkib/hQggouVdJSaT64T1HCwGtFE/2/HE= From: Saurabh Sengar To: kys@microsoft.com, haiyangz@microsoft.com, wei.liu@kernel.org, decui@microsoft.com, tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, dave.hansen@linux.intel.com, x86@kernel.org, mikelley@microsoft.com, linux-kernel@vger.kernel.org, linux-hyperv@vger.kernel.org, hpa@zytor.com Subject: [PATCH] x86/hyperv: add noop functions to x86_init mpparse functions Date: Fri, 2 Jun 2023 05:41:52 -0700 Message-Id: <1685709712-13752-1-git-send-email-ssengar@linux.microsoft.com> X-Mailer: git-send-email 1.8.3.1 X-Spam-Status: No, score=-19.8 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,ENV_AND_HDR_SPF_MATCH,RCVD_IN_DNSWL_MED, SPF_HELO_PASS,SPF_PASS,T_SCC_BODY_TEXT_LINE,USER_IN_DEF_DKIM_WL, USER_IN_DEF_SPF_WL autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-getmail-retrieved-from-mailbox: =?utf-8?q?INBOX?= X-GMAIL-THRID: =?utf-8?q?1767595566309400956?= X-GMAIL-MSGID: =?utf-8?q?1767595566309400956?= In !ACPI system, there is no way to disable CONFIG_X86_MPPARSE. When CONFIG_X86_MPPARSE is enabled for VTL2, the kernel will scan low memory looking for MP tables. Don't allow this, because low memory is controlled by VTL0 and may contain actual valid tables for VTL0, which can confuse the VTL2 kernel. Signed-off-by: Saurabh Sengar --- arch/x86/hyperv/hv_vtl.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/arch/x86/hyperv/hv_vtl.c b/arch/x86/hyperv/hv_vtl.c index 1ba5d3b99b16..ea21d897b5da 100644 --- a/arch/x86/hyperv/hv_vtl.c +++ b/arch/x86/hyperv/hv_vtl.c @@ -23,6 +23,10 @@ void __init hv_vtl_init_platform(void) x86_init.irqs.pre_vector_init = x86_init_noop; x86_init.timers.timer_init = x86_init_noop; + /* Avoid searching for BIOS MP tables */ + x86_init.mpparse.find_smp_config = x86_init_noop; + x86_init.mpparse.get_smp_config = x86_init_uint_noop; + x86_platform.get_wallclock = get_rtc_noop; x86_platform.set_wallclock = set_rtc_noop; x86_platform.get_nmi_reason = hv_get_nmi_reason;