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 496E6740049 for ; Tue, 27 Feb 2024 11:19:32 +0000 (UTC) DKIM-Signature: a=rsa-sha256; bh=s/j4BQRxNnswwmiUGFh/kcItDiCufpyTu6TdXtCfEFQ=; 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=1709032770; v=1; b=Q3XTzxE/aJP3OJ1QkEwUfobBxDKeY9e8dh0XbFUCSY1hSRFm/EVMLNqNd2H5Y3z/WZmctYQH FPLB8N/vZsOo5dIxE/qQWLMCE4ljt7snOeB/v0bQiGVZb4DJRlUvzqS8GRw7pp9zqZMdATE6oDV wK95hM3RHcCL2gJmwXb9D6QU= X-Received: by 127.0.0.2 with SMTP id GdqmYY7687511x7HIpzsV5Nr; Tue, 27 Feb 2024 03:19:30 -0800 X-Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) by mx.groups.io with SMTP id smtpd.web10.10100.1709032770081897908 for ; Tue, 27 Feb 2024 03:19:30 -0800 X-Received: from mimecast-mx02.redhat.com (mimecast-mx02.redhat.com [66.187.233.88]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-543-QRhpdVOjPGWg8XXl7K-_FA-1; Tue, 27 Feb 2024 06:19:25 -0500 X-MC-Unique: QRhpdVOjPGWg8XXl7K-_FA-1 X-Received: from smtp.corp.redhat.com (int-mx09.intmail.prod.int.rdu2.redhat.com [10.11.54.9]) (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 470E6185A781; Tue, 27 Feb 2024 11:19:24 +0000 (UTC) X-Received: from sirius.home.kraxel.org (unknown [10.39.192.249]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 6F98A492BC6; Tue, 27 Feb 2024 11:19:23 +0000 (UTC) X-Received: by sirius.home.kraxel.org (Postfix, from userid 1000) id 3E69D18009BA; Tue, 27 Feb 2024 12:19:22 +0100 (CET) Date: Tue, 27 Feb 2024 12:19:22 +0100 From: "Gerd Hoffmann" To: Tom Lendacky Cc: devel@edk2.groups.io, Ard Biesheuvel , Erdem Aktas , Jiewen Yao , Laszlo Ersek , Liming Gao , Michael D Kinney , Min Xu , Zhiguang Liu , Rahul Kumar , Ray Ni , Michael Roth Subject: Re: [edk2-devel] [PATCH v2 09/23] OvmfPkg/BaseMemEncryptSevLib: Maximize Page State Change efficiency Message-ID: References: <4f8a004b8f5f6de32d44c478543f9542fd9c82f2.1708623001.git.thomas.lendacky@amd.com> MIME-Version: 1.0 In-Reply-To: <4f8a004b8f5f6de32d44c478543f9542fd9c82f2.1708623001.git.thomas.lendacky@amd.com> X-Scanned-By: MIMEDefang 3.4.1 on 10.11.54.9 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: 9fDeOGBeKkKlbo0pgYm69zqax7686176AA= 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="Q3XTzxE/"; dmarc=fail reason="SPF not aligned (relaxed), DKIM not aligned (relaxed)" header.from=redhat.com (policy=none); spf=pass (spool.mail.gandi.net: domain of bounce@groups.io designates 66.175.222.108 as permitted sender) smtp.mailfrom=bounce@groups.io On Thu, Feb 22, 2024 at 11:29:48AM -0600, Tom Lendacky wrote: > BZ: https://bugzilla.tianocore.org/show_bug.cgi?id=4654 > > When building the Page State Change entries for a range of memory, it can > happen that multiple calls to BuildPageStateBuffer() need to be made. If > the size of the input work area passed to BuildPageStateBuffer() exceeds > the number of entries that can be passed to the hypervisor using the GHCB > shared buffer, the Page State Change VMGEXIT support will issue multiple > VMGEXITs to process all entries in the buffer. > > However, it could be that the final VMGEXIT for each round of Page State > Changes is only for a small number of entries and subsequent VMGEXITs may > still be issued to handle the full range of memory requested. To maximize > the number of entries processed during the Page State Change VMGEXIT, > limit BuildPageStateBuffer() to not build entries that exceed the maximum > number of entries that can be handled in a single Page State Change > VMGEXIT. > > Signed-off-by: Tom Lendacky Reviewed-by: Gerd Hoffmann -=-=-=-=-=-=-=-=-=-=-=- Groups.io Links: You receive all messages sent to this group. View/Reply Online (#116027): https://edk2.groups.io/g/devel/message/116027 Mute This Topic: https://groups.io/mt/104512950/7686176 Group Owner: devel+owner@edk2.groups.io Unsubscribe: https://edk2.groups.io/g/devel/unsub [rebecca@openfw.io] -=-=-=-=-=-=-=-=-=-=-=-