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=-3.6 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS 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 2EDB8C07E99 for ; Mon, 12 Jul 2021 09:50:54 +0000 (UTC) Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (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 940096102A for ; Mon, 12 Jul 2021 09:50:53 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 940096102A Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=redhat.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Received: from localhost ([::1]:36904 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1m2saS-0005VF-GE for qemu-devel@archiver.kernel.org; Mon, 12 Jul 2021 05:50:52 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:33298) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1m2sZc-0004gb-8F for qemu-devel@nongnu.org; Mon, 12 Jul 2021 05:50:00 -0400 Received: from us-smtp-delivery-124.mimecast.com ([170.10.133.124]:50185) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1m2sZX-0007GU-Qo for qemu-devel@nongnu.org; Mon, 12 Jul 2021 05:49:58 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1626083394; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=OM/iwwVYUbe1CyDjJQ54Gx8sBHDi8QnZ+IrtfImXwD4=; b=AUwSm9/HWbh3dS1vpzJwr4GGgzfaSONVVfWryBpIqYZf6snukc2/VC41ZXGjNrf/pwwJ4W uXREMixtLpL9b6mlkgrMN9PN5DjmUPHp5U1FqAP7alsvvFsOfUh3+kTt/byjvw5KofDzY3 MwQkdS+9U0cVc7BC9JDmWW2Tu4cg+YU= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-480-BFOy-0--N_qociMcxZyTLg-1; Mon, 12 Jul 2021 05:49:52 -0400 X-MC-Unique: BFOy-0--N_qociMcxZyTLg-1 Received: from smtp.corp.redhat.com (int-mx03.intmail.prod.int.phx2.redhat.com [10.5.11.13]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 9D7DA802E6C; Mon, 12 Jul 2021 09:49:51 +0000 (UTC) Received: from starship (unknown [10.40.192.10]) by smtp.corp.redhat.com (Postfix) with ESMTP id C438860871; Mon, 12 Jul 2021 09:49:45 +0000 (UTC) Message-ID: Subject: Re: About two-dimensional page translation (e.g., Intel EPT) and shadow page table in Linux QEMU/KVM From: Maxim Levitsky To: harry harry , kvm@vger.kernel.org, qemu-devel@nongnu.org Date: Mon, 12 Jul 2021 12:49:44 +0300 In-Reply-To: References: Content-Type: text/plain; charset="UTF-8" User-Agent: Evolution 3.36.5 (3.36.5-2.fc32) MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Scanned-By: MIMEDefang 2.79 on 10.5.11.13 Received-SPF: pass client-ip=170.10.133.124; envelope-from=mlevitsk@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -34 X-Spam_score: -3.5 X-Spam_bar: --- X-Spam_report: (-3.5 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.7, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H4=-0.01, RCVD_IN_MSPIKE_WL=-0.01, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Paolo Bonzini , mathieu.tarral@protonmail.com, stefanha@redhat.com, Sean Christopherson Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On Sun, 2021-07-11 at 15:13 -0500, harry harry wrote: > Hi all, > > I hope you are very well! May I know whether it is possible to enable > two-dimensional page translation (e.g., Intel EPT) mechanisms and > shadow page table mechanisms in Linux QEMU/KVM at the same time on a > physical server? For example, if the physical server has 80 cores, is > it possible to let 40 cores use Intel EPT mechanisms for page > translation and the other 40 cores use shadow page table mechanisms? > Thanks! Nope sadly. EPT/NPT is enabled by a module param. Best regards, Maxim Levitsky > > Best, > Harry >