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=-3.8 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED 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 9B5DEC4338F for ; Tue, 24 Aug 2021 20:31:23 +0000 (UTC) Received: from smtp4.osuosl.org (smtp4.osuosl.org [140.211.166.137]) (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 2A72461163 for ; Tue, 24 Aug 2021 20:31:23 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org 2A72461163 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=kernel.org Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=lists.linux-foundation.org Received: from localhost (localhost [127.0.0.1]) by smtp4.osuosl.org (Postfix) with ESMTP id EB2E14254B; Tue, 24 Aug 2021 20:31:22 +0000 (UTC) X-Virus-Scanned: amavisd-new at osuosl.org Received: from smtp4.osuosl.org ([127.0.0.1]) by localhost (smtp4.osuosl.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id YqaGpTa3v3Ww; Tue, 24 Aug 2021 20:31:19 +0000 (UTC) Received: from lists.linuxfoundation.org (lf-lists.osuosl.org [140.211.9.56]) by smtp4.osuosl.org (Postfix) with ESMTPS id 7BDAA42536; Tue, 24 Aug 2021 20:31:18 +0000 (UTC) Received: from lf-lists.osuosl.org (localhost [127.0.0.1]) by lists.linuxfoundation.org (Postfix) with ESMTP id 56E69C001A; Tue, 24 Aug 2021 20:31:18 +0000 (UTC) Received: from smtp1.osuosl.org (smtp1.osuosl.org [140.211.166.138]) by lists.linuxfoundation.org (Postfix) with ESMTP id 846EFC000E for ; Tue, 24 Aug 2021 20:31:17 +0000 (UTC) Received: from localhost (localhost [127.0.0.1]) by smtp1.osuosl.org (Postfix) with ESMTP id 6FC3481886 for ; Tue, 24 Aug 2021 20:31:17 +0000 (UTC) X-Virus-Scanned: amavisd-new at osuosl.org Authentication-Results: smtp1.osuosl.org (amavisd-new); dkim=pass (2048-bit key) header.d=kernel.org Received: from smtp1.osuosl.org ([127.0.0.1]) by localhost (smtp1.osuosl.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id C0dKI8Xbhr5m for ; Tue, 24 Aug 2021 20:31:17 +0000 (UTC) X-Greylist: domain auto-whitelisted by SQLgrey-1.8.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp1.osuosl.org (Postfix) with ESMTPS id 06A948183D for ; Tue, 24 Aug 2021 20:31:16 +0000 (UTC) Received: by mail.kernel.org (Postfix) with ESMTPSA id 3738C610F7; Tue, 24 Aug 2021 20:31:16 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1629837076; bh=u89RhbA1T4/YcegxqumOKFDZveULzg7IH3BXxWstXGA=; h=Date:From:To:Cc:Subject:In-Reply-To:From; b=E7gmG9cu+2X8EpSv9jHNw194dQ/bFH+W8S5CviPC+WEzgK9x1GqwxeKDnQA93Ubc6 pIROpW9mCbmFawlLNt183dkzLJG92jUie48vdct5nMY9KMIpav4jCN5vVtcBqt99IN LlMRmUTD9hQbKroaOXlhVlrUixEOK798eHEQ6pmGyuqfJJo5J4wfidKynCvdtb3s37 PjcEO5DOcIPu3SLREF0Tt+IUZRL6NjCeGqQy3Vt+WmnxMDtnryxVfbjA5YVJAeYKm9 BpOJvSuNngQVXkAMINkK0ZwKmdIz+EDYyzVhKaDWPyJSTPhZYBRtaAf1VAW/wDK4NO xT3mGvV5LJ4bA== Date: Tue, 24 Aug 2021 15:31:15 -0500 From: Bjorn Helgaas To: Andi Kleen Subject: Re: [PATCH v4 11/15] pci: Add pci_iomap_shared{,_range} Message-ID: <20210824203115.GA3492097@bjorn-Precision-5520> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: Cc: "Kuppuswamy, Sathyanarayanan" , Kuppuswamy Sathyanarayanan , "Michael S. Tsirkin" , Peter Zijlstra , Linux PCI , linux-mips@vger.kernel.org, James E J Bottomley , Dave Hansen , Peter H Anvin , sparclinux@vger.kernel.org, Rajat Jain , Thomas Gleixner , linux-arch , Jonathan Corbet , Helge Deller , X86 ML , Ingo Molnar , Arnd Bergmann , Tony Luck , Borislav Petkov , Andy Lutomirski , Bjorn Helgaas , Dan Williams , virtualization@lists.linux-foundation.org, Richard Henderson , Thomas Bogendoerfer , linux-parisc@vger.kernel.org, Sean Christopherson , Linux Doc Mailing List , Linux Kernel Mailing List , linux-alpha@vger.kernel.org, "David S . Miller" , Kirill Shutemov X-BeenThere: virtualization@lists.linux-foundation.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: Linux virtualization List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: virtualization-bounces@lists.linux-foundation.org Sender: "Virtualization" On Tue, Aug 24, 2021 at 01:14:02PM -0700, Andi Kleen wrote: > > On 8/24/2021 11:55 AM, Bjorn Helgaas wrote: > > [+cc Rajat; I still don't know what "shared memory with a hypervisor > > in a confidential guest" means, > > A confidential guest is a guest which uses memory encryption to isolate > itself from the host. It doesn't trust the host. But it still needs to > communicate with the host for IO, so it has some special memory areas that > are explicitly marked shared. These are used to do IO with the host. All > their usage needs to be carefully hardened to avoid any security attacks on > the guest, that's why we want to limit this interaction only to a small set > of hardened drivers. For MMIO, the set is currently only virtio and MSI-X. Good material for the commit log next time around. Thanks! Bjorn _______________________________________________ Virtualization mailing list Virtualization@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/virtualization