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=-0.6 required=3.0 tests=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 5DD03C2BA19 for ; Thu, 23 Apr 2020 06:20:01 +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 2575920724 for ; Thu, 23 Apr 2020 06:20:01 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="qEL7jXjd" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 2575920724 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=infradead.org Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Received: from localhost ([::1]:37506 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1jRVDM-00083B-9C for qemu-devel@archiver.kernel.org; Thu, 23 Apr 2020 02:20:00 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:58912) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1jRVCE-0007XI-7R for qemu-devel@nongnu.org; Thu, 23 Apr 2020 02:18:50 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.90_1) (envelope-from ) id 1jRVCD-00063d-3u for qemu-devel@nongnu.org; Thu, 23 Apr 2020 02:18:50 -0400 Received: from bombadil.infradead.org ([2607:7c80:54:e::133]:34952) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1jRVCC-00057V-BD for qemu-devel@nongnu.org; Thu, 23 Apr 2020 02:18:48 -0400 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20170209; h=In-Reply-To:Content-Type:MIME-Version :References:Message-ID:Subject:Cc:To:From:Date:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=rq+QTShohzY4Rd55RAkLg7KPowx3+3Zby0B4moCrCAY=; b=qEL7jXjdh2GSG0KAjb7y96qB1K wOBucwe//4VQGGg/7GXhV+gQ6CMAXoGlzwYLQ62tBi3VaGqsCf0uO3KP8q2HpxcJutrlexg0JBK4B sWtpnDwYuhphJSvyXGABzlVszINTd0bDteg8nSbUPAMnmlEjIYcRoqu9VN7ct/xM5vSDXaTsSkgMP cmg9nPEYHl9tuQuRSoyX6004eLFn+GnUuBIZanO/vhOzVCxE8K5jZkh/qgGUziwuYilR0/AALIqE7 xlwzMQ78eqpC/siuM6wPXjkqZGqyh4YR6dDmEda21cwqxKHByclDa9fPB/sFU8QW60Z9EgDkHzOjU b12plF5Q==; Received: from hch by bombadil.infradead.org with local (Exim 4.92.3 #3 (Red Hat Linux)) id 1jRV9z-00067g-MX; Thu, 23 Apr 2020 06:16:31 +0000 Date: Wed, 22 Apr 2020 23:16:31 -0700 From: Christoph Hellwig To: Jon Derrick Subject: Re: [PATCH 0/1] KVM support for VMD devices Message-ID: <20200423061631.GA12688@infradead.org> References: <20200422171444.10992-1-jonathan.derrick@intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20200422171444.10992-1-jonathan.derrick@intel.com> X-SRS-Rewrite: SMTP reverse-path rewritten from by bombadil.infradead.org. See http://www.infradead.org/rpr.html Received-SPF: none client-ip=2607:7c80:54:e::133; envelope-from=BATV+4e4c82ab207447f3219b+6087+infradead.org+hch@bombadil.srs.infradead.org; helo=bombadil.infradead.org X-detected-operating-system: by eggs.gnu.org: Error: [-] PROGRAM ABORT : Malformed IPv6 address (bad octet value). Location : parse_addr6(), p0f-client.c:67 X-Received-From: 2607:7c80:54:e::133 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: Lorenzo Pieralisi , linux-pci@vger.kernel.org, qemu-devel@nongnu.org, virtualization@lists.linux-foundation.org, Bjorn Helgaas , Andrzej Jakowski Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On Wed, Apr 22, 2020 at 01:14:44PM -0400, Jon Derrick wrote: > The two patches (Linux & QEMU) add support for passthrough VMD devices > in QEMU/KVM. VMD device 28C0 already supports passthrough natively by > providing the Host Physical Address in a shadow register to the guest > for correct bridge programming. > > The QEMU patch emulates the 28C0 mode by creating a shadow register and > advertising its support by using QEMU's subsystem vendor/id. > The Linux patch matches the QEMU subsystem vendor/id to use the shadow > register. Please pick a different PCI ID for Qemu vs real hardware so that we can properly quirk them if they end up behaving differently due to hardware or software bugs.