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=-8.6 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS autolearn=ham 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 2E15EC2B9F7 for ; Wed, 26 May 2021 05:40:59 +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 977BC613F4 for ; Wed, 26 May 2021 05:40:58 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 977BC613F4 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]:42534 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1llmHp-00056V-GV for qemu-devel@archiver.kernel.org; Wed, 26 May 2021 01:40:57 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:44460) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1llmGA-0004PG-8N for qemu-devel@nongnu.org; Wed, 26 May 2021 01:39:14 -0400 Received: from us-smtp-delivery-124.mimecast.com ([170.10.133.124]:24031) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1llmG6-0006fV-Lh for qemu-devel@nongnu.org; Wed, 26 May 2021 01:39:13 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1622007548; 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: in-reply-to:in-reply-to:references:references; bh=Ogdnwrv8EnweBfzc5kp3FkUpqmBHuZ3/rPFEY/5MiIA=; b=B1KM19PtUfP4mxwHBR9bxHPCOv3B2N+dF8rn+ayyHfOSzd3BgdPn13RS30sJsTVmK9QRCy FQAC2VpeUMSgwRWrgC4s9Nt1juYfFx8akEP8sE9hNUl4omD7BnBnkpJ1HpGhq15YJ9Vncf dVGUiJrxPl9Wk9uiW7k2MPtzQOU3GAs= Received: from mail-wr1-f69.google.com (mail-wr1-f69.google.com [209.85.221.69]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-256-4Pm4DCumMgud-Qct9wxtEg-1; Wed, 26 May 2021 01:39:06 -0400 X-MC-Unique: 4Pm4DCumMgud-Qct9wxtEg-1 Received: by mail-wr1-f69.google.com with SMTP id u5-20020adf9e050000b029010df603f280so15484534wre.18 for ; Tue, 25 May 2021 22:39:05 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:from:to:cc:subject:message-id:references :mime-version:content-disposition:in-reply-to; bh=Ogdnwrv8EnweBfzc5kp3FkUpqmBHuZ3/rPFEY/5MiIA=; b=PG+benGxmYIhuiFj+y+hoI9UOVPUFASkSi25H3FtNnkBNIBd2xEGaiMSH8G/CGIvel lGXXQsOSir0FdTozbErRmaTNKhmFS9RzuUApNPsU/C9GSivLIpkwKRwgQbHBOIXHbr5T aU+ycGud1LsnA1KQcdnG2hlkSXDN/F64Iamidc/faxmm7R/j2v9miS+5wK06O9ZJhtzG VUguWqkliznS0EvPiYWTIOhFN22aCQwOvUogCMLhbukv2DMaEOT+Sc/3k0guwAHBSwu6 aONegKaDmLNN3pxIRnoWByOB9HR8NLb0hOYjrE5f370o2hVY0iaazOqqFk66vsoWFLyZ 46iw== X-Gm-Message-State: AOAM530misPH15zQz/rXwzlqGlcS1m3kzoCPpyWOu4nc0KSyccdkpHN3 rFXkhettxEDmjnxAsFnO8GG6Y1iDXn0BN2NftdN19QK8pInpxxu8ueKFphb5frFLp8VSxre+2mn xRhGmmEdqcOe/E0k= X-Received: by 2002:adf:f8c4:: with SMTP id f4mr30626966wrq.65.1622007544578; Tue, 25 May 2021 22:39:04 -0700 (PDT) X-Google-Smtp-Source: ABdhPJwDaGuaI0+ST0KLnPQHVjbywjYyADbE3BUrClCysFZVMbz8s9X5lJIKRi7RhdBUX7IHFDwMKw== X-Received: by 2002:adf:f8c4:: with SMTP id f4mr30626948wrq.65.1622007544389; Tue, 25 May 2021 22:39:04 -0700 (PDT) Received: from redhat.com ([2a10:8006:fcda:0:90d:c7e7:9e26:b297]) by smtp.gmail.com with ESMTPSA id v18sm22147050wro.18.2021.05.25.22.39.02 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 25 May 2021 22:39:03 -0700 (PDT) Date: Wed, 26 May 2021 01:39:00 -0400 From: "Michael S. Tsirkin" To: Julia Suvorova Subject: Re: [RFC PATCH v4 0/7] Use ACPI PCI hot-plug for Q35 Message-ID: <20210526013830-mutt-send-email-mst@kernel.org> References: <20210513062642.3027987-1-jusual@redhat.com> MIME-Version: 1.0 In-Reply-To: <20210513062642.3027987-1-jusual@redhat.com> Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=mst@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Received-SPF: pass client-ip=170.10.133.124; envelope-from=mst@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -31 X-Spam_score: -3.2 X-Spam_bar: --- X-Spam_report: (-3.2 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.371, 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=0.001, RCVD_IN_MSPIKE_WL=0.001, 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: Igor Mammedov , qemu-devel@nongnu.org, Eduardo Habkost Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On Thu, May 13, 2021 at 08:26:35AM +0200, Julia Suvorova wrote: > The patch set consists of two parts: > patches 1-4: introduce new feature > 'acpi-pci-hotplug-with-bridge-support' on Q35 > patches 5-7: make the feature default along with changes in ACPI tables > > This way maintainers can decide which way to choose without breaking > the patch set. This is in good shape, I think the next version can be a non-RFC series. > With the feature disabled Q35 falls back to the native hot-plug. > > Pros > * no racy behavior during boot (see 110c477c2ed) > * eject is possible - according to PCIe spec, attention button > press should lead to power off, and then the adapter should be > removed manually. As there is no power down state exists in QEMU, > we cannot distinguish between an eject and a power down > request. > * no delay during deleting - after the actual power off software > must wait at least 1 second before indicating about it. This case > is quite important for users, it even has its own bug: > https://bugzilla.redhat.com/show_bug.cgi?id=1594168 > * no timer-based behavior - in addition to the previous example, > the attention button has a 5-second waiting period, during which > the operation can be canceled with a second press. While this > looks fine for manual button control, automation will result in > the need to queue or drop events, and the software receiving > events in all sort of unspecified combinations of attention/power > indicator states, which is racy and uppredictable. > * fixes or reduces the likelihood of the bugs: > * https://bugzilla.redhat.com/show_bug.cgi?id=1833187 > * https://bugzilla.redhat.com/show_bug.cgi?id=1657077 > * https://bugzilla.redhat.com/show_bug.cgi?id=1669931 > * https://bugzilla.redhat.com/show_bug.cgi?id=1678290 > > Cons: > * no access to possible features presented in slot capabilities > (this is only surprise removal AFAIK) > > v4: > * regain per-port control over hot-plug > * rebased over acpi-index changes > * set property on machine type to > make pci code more generic [Igor, Michael] > > v3: > * drop change of _OSC to allow SHPC on hotplugged bridges > * use 'acpi-root-pci-hotplug' > * add migration states [Igor] > * minor style changes > > v2: > * new ioport range for acpiphp [Gerd] > * drop find_pci_host() [Igor] > * explain magic numbers in _OSC [Igor] > * drop build_q35_pci_hotplug() wrapper [Igor] > > Julia Suvorova (7): > hw/acpi/pcihp: Enhance acpi_pcihp_disable_root_bus() to support Q35 > hw/i386/acpi-build: Add ACPI PCI hot-plug methods to Q35 > hw/acpi/ich9: Enable ACPI PCI hot-plug > hw/pci/pcie: Do not set HPC flag if acpihp is used > bios-tables-test: Allow changes in DSDT ACPI tables > hw/acpi/ich9: Set ACPI PCI hot-plug as default on Q35 > bios-tables-test: Update golden binaries > > hw/i386/acpi-build.h | 5 +++ > include/hw/acpi/ich9.h | 5 +++ > include/hw/acpi/pcihp.h | 3 +- > include/hw/boards.h | 1 + > hw/acpi/ich9.c | 68 ++++++++++++++++++++++++++++++ > hw/acpi/pcihp.c | 22 +++++++--- > hw/acpi/piix4.c | 4 +- > hw/core/machine.c | 19 +++++++++ > hw/i386/acpi-build.c | 32 ++++++++------ > hw/i386/pc.c | 4 +- > hw/i386/pc_q35.c | 8 ++++ > hw/pci/pcie.c | 11 ++++- > tests/data/acpi/q35/DSDT | Bin 7859 -> 8289 bytes > tests/data/acpi/q35/DSDT.acpihmat | Bin 9184 -> 9614 bytes > tests/data/acpi/q35/DSDT.bridge | Bin 7877 -> 11003 bytes > tests/data/acpi/q35/DSDT.cphp | Bin 8323 -> 8753 bytes > tests/data/acpi/q35/DSDT.dimmpxm | Bin 9513 -> 9943 bytes > tests/data/acpi/q35/DSDT.ipmibt | Bin 7934 -> 8364 bytes > tests/data/acpi/q35/DSDT.memhp | Bin 9218 -> 9648 bytes > tests/data/acpi/q35/DSDT.mmio64 | Bin 8990 -> 9419 bytes > tests/data/acpi/q35/DSDT.nohpet | Bin 7717 -> 8147 bytes > tests/data/acpi/q35/DSDT.numamem | Bin 7865 -> 8295 bytes > tests/data/acpi/q35/DSDT.tis | Bin 8465 -> 8894 bytes > 23 files changed, 161 insertions(+), 21 deletions(-) > > -- > 2.30.2