From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail02.groups.io (mail02.groups.io [66.175.222.108]) by spool.mail.gandi.net (Postfix) with ESMTPS id 5D08ED80122 for ; Wed, 10 Jan 2024 10:54:39 +0000 (UTC) DKIM-Signature: a=rsa-sha256; bh=3p8DUaWFxgC1jOpx+x2imI9wgbcds9nyT2xCn3CP8hI=; c=relaxed/simple; d=groups.io; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version:In-Reply-To:Precedence:List-Subscribe:List-Help:Sender:List-Id:Mailing-List:Delivered-To:Reply-To:List-Unsubscribe-Post:List-Unsubscribe:Content-Type:Content-Disposition; s=20140610; t=1704884077; v=1; b=BvzcP0LEGMGzfohL1JdRJkSc+PEGNRanmrWWY4U6UtpF5hlkTrLX/ewHz9ff5BO2d7vhW28G QE8YBx6YEppYDA72F7Ql9V8/heqvTrIdFP8fP6bCx+YL1zrplWthZa6Ct8nvxwgCbnBUGvLNesi Xhwap5MIj6t7PUW37bdI0s5Q= X-Received: by 127.0.0.2 with SMTP id uylwYY7687511xh1zBHeJ0k9; Wed, 10 Jan 2024 02:54:37 -0800 X-Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) by mx.groups.io with SMTP id smtpd.web11.9119.1704884077031123001 for ; Wed, 10 Jan 2024 02:54:37 -0800 X-Received: from mimecast-mx02.redhat.com (mx-ext.redhat.com [66.187.233.73]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-516-BVwsA7pPPHWf1FGm9L9SHA-1; Wed, 10 Jan 2024 05:54:32 -0500 X-MC-Unique: BVwsA7pPPHWf1FGm9L9SHA-1 X-Received: from smtp.corp.redhat.com (int-mx05.intmail.prod.int.rdu2.redhat.com [10.11.54.5]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 15E40386A0A0; Wed, 10 Jan 2024 10:54:32 +0000 (UTC) X-Received: from sirius.home.kraxel.org (unknown [10.39.192.101]) by smtp.corp.redhat.com (Postfix) with ESMTPS id E7DB051E3; Wed, 10 Jan 2024 10:54:31 +0000 (UTC) X-Received: by sirius.home.kraxel.org (Postfix, from userid 1000) id BB3C21800605; Wed, 10 Jan 2024 11:54:30 +0100 (CET) Date: Wed, 10 Jan 2024 11:54:30 +0100 From: "Gerd Hoffmann" To: Dun Tan Cc: devel@edk2.groups.io, Ray Ni , Laszlo Ersek , Rahul Kumar Subject: Re: [edk2-devel] [PATCH] UefiCpuPkg:Limit PhysicalAddressBits in speicial case Message-ID: References: <20240110080544.1350-1-dun.tan@intel.com> MIME-Version: 1.0 In-Reply-To: <20240110080544.1350-1-dun.tan@intel.com> X-Scanned-By: MIMEDefang 3.4.1 on 10.11.54.5 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Precedence: Bulk List-Subscribe: List-Help: Sender: devel@edk2.groups.io List-Id: Mailing-List: list devel@edk2.groups.io; contact devel+owner@edk2.groups.io Reply-To: devel@edk2.groups.io,kraxel@redhat.com List-Unsubscribe-Post: List-Unsubscribe=One-Click List-Unsubscribe: X-Gm-Message-State: Qh428MaCS90IDkL0EqerTi9Kx7686176AA= Content-Type: text/plain; charset=us-ascii Content-Disposition: inline X-GND-Status: LEGIT Authentication-Results: spool.mail.gandi.net; dkim=pass header.d=groups.io header.s=20140610 header.b=BvzcP0LE; spf=pass (spool.mail.gandi.net: domain of bounce@groups.io designates 66.175.222.108 as permitted sender) smtp.mailfrom=bounce@groups.io; dmarc=fail reason="SPF not aligned (relaxed), DKIM not aligned (relaxed)" header.from=redhat.com (policy=none) On Wed, Jan 10, 2024 at 04:05:44PM +0800, Dun Tan wrote: > When creating smm page table, limit maximum > supported physical address bits returned by > CalculateMaximumSupportAddress() to 48 if > 5-Level Paging is disabled. > When 5-Level Paging is disabled and the > PhysicalAddressBits retrived from CPU HOB or > CpuId is bigger than 48, only [0, 2^48 -1] > range in 52-bit physical address is mapped > in page table. I think this is wrong. Virtual addresses are sign-extended, i.e. the virtual address space without 5-level paging is: 0x0000000000000000 -> 0x00007fffffffffff and 0xffff800000000000 -> 0xffffffffffffffff Therefore identity-mapping works for [0, 2^47-1] only. take care, Gerd -=-=-=-=-=-=-=-=-=-=-=- Groups.io Links: You receive all messages sent to this group. View/Reply Online (#113523): https://edk2.groups.io/g/devel/message/113523 Mute This Topic: https://groups.io/mt/103637402/7686176 Group Owner: devel+owner@edk2.groups.io Unsubscribe: https://edk2.groups.io/g/devel/unsub [rebecca@openfw.io] -=-=-=-=-=-=-=-=-=-=-=-