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.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 smtp.lore.kernel.org (Postfix) with ESMTPS id 7AA15C3DA5D for ; Thu, 25 Jul 2024 10:01:22 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1sWvGz-0003f0-Ou; Thu, 25 Jul 2024 06:00:33 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1sWvGx-0003eL-RV for qemu-devel@nongnu.org; Thu, 25 Jul 2024 06:00:31 -0400 Received: from casper.infradead.org ([2001:8b0:10b:1236::1]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1sWvGu-0003kE-NV for qemu-devel@nongnu.org; Thu, 25 Jul 2024 06:00:31 -0400 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=MIME-Version:Content-Type:References: In-Reply-To:Date:Cc:To:From:Subject:Message-ID:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=/7IxyE746tB7gLFGUryPRx7FJ/Ne/kURVczteivoMWM=; b=bpJALwyMZsq53PsnZIrXIlUtAQ GlFdwp5W+vrYM69gwsbF83dXtsKoI0bE0jFv7hLrllcjxa4ck4U8LWqApf7YXKCr2I1P4UxKzGOHs 9BeC34FMYVTq6OSyWZSJBPFIAF+/C17CiQtsa9s45ATAE0Q3UDJ6qLkLirUQKfYgggP9IHkFKcVNc +q/shmWUZUxxazV3QvNYl0FpJgiWxK+x1SdD0tbEi8tsroerdvsGXYVmvOMLZGIH/Te3UqFElLTj7 rBz5WNPr5G8HQ+nTlv8X//fAOnxHovAB9bY4v1dcPJjdVXpkhkt+orEe4114RVlECsucd8LQ0nGHV DSzsy2mQ==; Received: from [2001:8b0:10b:5:25df:2ae1:4889:ee99] (helo=u3832b3a9db3152.ant.amazon.com) by casper.infradead.org with esmtpsa (Exim 4.97.1 #2 (Red Hat Linux)) id 1sWvGi-00000008mHI-1oqA; Thu, 25 Jul 2024 10:00:16 +0000 Message-ID: Subject: Re: [PATCH] ptp: Add vDSO-style vmclock support From: David Woodhouse To: "Michael S. Tsirkin" Cc: Richard Cochran , Peter Hilber , linux-kernel@vger.kernel.org, virtualization@lists.linux.dev, linux-arm-kernel@lists.infradead.org, linux-rtc@vger.kernel.org, "Ridoux, Julien" , virtio-dev@lists.linux.dev, "Luu, Ryan" , "Chashper, David" , "Mohamed Abuelfotoh, Hazem" , "Christopher S . Hall" , Jason Wang , John Stultz , netdev@vger.kernel.org, Stephen Boyd , Thomas Gleixner , Xuan Zhuo , Marc Zyngier , Mark Rutland , Daniel Lezcano , Alessandro Zummo , Alexandre Belloni , qemu-devel , Simon Horman Date: Thu, 25 Jul 2024 11:00:15 +0100 In-Reply-To: <20240725015120-mutt-send-email-mst@kernel.org> References: <14d1626bc9ddae9d8ad19d3c508538d10f5a8e44.camel@infradead.org> <20240725015120-mutt-send-email-mst@kernel.org> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-mX6aQ5w+mkWSt01+2kjl" User-Agent: Evolution 3.44.4-0ubuntu2 MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org. See http://www.infradead.org/rpr.html Received-SPF: none client-ip=2001:8b0:10b:1236::1; envelope-from=BATV+24aa3f22b0bcc14e6bb8+7641+infradead.org+dwmw2@casper.srs.infradead.org; helo=casper.infradead.org X-Spam_score_int: -43 X-Spam_score: -4.4 X-Spam_bar: ---- X-Spam_report: (-4.4 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_MED=-2.3, SPF_HELO_NONE=0.001, SPF_NONE=0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org --=-mX6aQ5w+mkWSt01+2kjl Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Thu, 2024-07-25 at 01:54 -0400, Michael S. Tsirkin wrote: > one other thing worth mentioning is that this design can't work > with confidential computing setups. By comparison, mapping e.g. a > range in a PCI BAR would work for these setups. Why so? This is just like mapping a PCI BAR, isn't it? It's cacheable MMIO space, *not* part of the encrypted guest RAM ranges. It just happens to be discovered through the _CRS of an ACPI device, not the BAR of a PCI device. > Is there a reason this functionality is not interesting for > confidential VMs? It is. In fact, that was one of the reasons for doing it as mappable MMIO space, instead of having the guest allocate a portion of its own RAM and invoke a hypervisor enlightenment to populate it. 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