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 1EB38C433EF for ; Fri, 24 Jun 2022 12:59:05 +0000 (UTC) Received: from localhost ([::1]:51818 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1o4its-00067u-11 for qemu-devel@archiver.kernel.org; Fri, 24 Jun 2022 08:59:04 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:56362) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1o4is4-0003WG-O7 for qemu-devel@nongnu.org; Fri, 24 Jun 2022 08:57:12 -0400 Received: from mail-yb1-xb2b.google.com ([2607:f8b0:4864:20::b2b]:45878) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1o4is3-0005gf-0S for qemu-devel@nongnu.org; Fri, 24 Jun 2022 08:57:12 -0400 Received: by mail-yb1-xb2b.google.com with SMTP id x184so1611993ybg.12 for ; Fri, 24 Jun 2022 05:57:10 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=YiA0YGlHhMKy/ne0Mh3r8zXDFLkjCNSQ537FSF96/24=; b=LndkKm2MAWPB3fwQ4CrnfzqRxS5hZUiKSw6JB316osM2WjtfhNcO0ZXODAXlPjFbbC O3EswrgZMTZBSLV7VYeLgj6r3yzeSPg9Akk6r5WaK21VhfXgfkmGSxmL4Y1Qo8kD59et JYvckztr7r5Fa70QOXq003etN8q3ZjQ3nZ8zwymcfg8SBroqtUiPVPA9DYC24sQeMPVA bvMoLrP2hj8clExquFlniSO5VqvOkkQylsjqZ83FHiZB/K8TLV2GdvYApnF9XKv4Bob+ zzQnLOt90NlCeBqNQVGsXS6GyZQyf/Pc6EnMdIYzXPWXa3CIFB8YBuxoez9sGMIDDWM5 9mUw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=YiA0YGlHhMKy/ne0Mh3r8zXDFLkjCNSQ537FSF96/24=; b=GU0MKcT+puVsHkvr5nmgzi6r0gkWEB3nI+twDC6kQ0FpTMSv8LdOesfgQ8f1zys2Pe ORPVI4Wc0YadBRmqENnTJ49BSU0aGEpotwvpQDmNmvPXhPXtKOTkYXT+4ZS3I9mYO5GW Tz0b/mRnV+0OqdLfEmfbee8KpMN0MWVwrJIgGWJfP8hOhuqtTfHDwdfftfMs/OCGAiM3 93XyD1QpXbaEKQ6x7hd0OaYj8lGlC/y1POJEvt+CXPimD94pyv7RhOXUN8jAF4GGE/jI phPRFMUA+Z6fGpJwMVQwweAKQH/TfCRzjFfpytQxgiZxOKd8rElaCZxvRQ0pq9WxRdn4 BlCQ== X-Gm-Message-State: AJIora+URgBr0wKj8fHuOKmkbWxxuxZXSOLHTfXAyXKxzV3GPWl9pEe0 lCbNvElS/LeFiYa7+G52/SsZVD1fe/ON0JP2cnVucA== X-Google-Smtp-Source: AGRyM1vnqCcyIkxaLhGzDujI38DtPZPyGcfvq+svZqcT4XL627aiXs+NBcZn7a4uOp9e+xW0HhccZsu3w16e46Zi9Gg= X-Received: by 2002:a25:7ec2:0:b0:669:b7ad:8806 with SMTP id z185-20020a257ec2000000b00669b7ad8806mr4913319ybc.85.1656075429910; Fri, 24 Jun 2022 05:57:09 -0700 (PDT) MIME-Version: 1.0 References: <20220616141950.23374-1-Jonathan.Cameron@huawei.com> <20220616141950.23374-2-Jonathan.Cameron@huawei.com> <20220624133909.00005f6e@Huawei.com> In-Reply-To: <20220624133909.00005f6e@Huawei.com> From: Peter Maydell Date: Fri, 24 Jun 2022 13:56:32 +0100 Message-ID: Subject: Re: [PATCH v11 1/2] hw/arm/virt: Basic CXL enablement on pci_expander_bridge instances pxb-cxl To: Jonathan Cameron Cc: qemu-devel@nongnu.org, alex.bennee@linaro.org, qemu-arm@nongnu.org, "Michael S . Tsirkin" , Ben Widawsky , Paolo Bonzini , linux-cxl@vger.kernel.org, linuxarm@huawei.com, Marcel Apfelbaum , Igor Mammedov , Markus Armbruster , Mark Cave-Ayland , Adam Manzanares , Tong Zhang , Shameerali Kolothum Thodi Content-Type: text/plain; charset="UTF-8" Received-SPF: pass client-ip=2607:f8b0:4864:20::b2b; envelope-from=peter.maydell@linaro.org; helo=mail-yb1-xb2b.google.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 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_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 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" On Fri, 24 Jun 2022 at 13:39, Jonathan Cameron wrote: > > On Fri, 24 Jun 2022 11:48:47 +0100 > Peter Maydell wrote: > > > > This seems to be missing code to advertise the new devices in the > > device tree. > > Intentionally. I am not aware of any current interest > in defining DT support CXL or supporting it in operating systems. > Easy enough to add if anyone does the leg work to figure out the > bindings, but that needs to come from someone who cares and > would need to be driven by OS support and a usecase. The ACPI > stuff here is defined as part of the main CXL spec because the > target class of machines simply doesn't generally use DT. I don't really want new devices in the virt board that aren't usable in the common use case of "just pass a kernel with -kernel"... -- PMM