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=-16.5 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,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 8803FC4338F for ; Wed, 25 Aug 2021 11:07:54 +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 E43C7610E5 for ; Wed, 25 Aug 2021 11:07:53 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org E43C7610E5 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=redhat.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=nongnu.org Received: from localhost ([::1]:46928 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1mIql6-0002tC-VT for qemu-devel@archiver.kernel.org; Wed, 25 Aug 2021 07:07:53 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:53658) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1mIqe5-0007yn-Kq for qemu-devel@nongnu.org; Wed, 25 Aug 2021 07:00:37 -0400 Received: from us-smtp-delivery-124.mimecast.com ([170.10.133.124]:38619) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1mIqe3-0004lK-AF for qemu-devel@nongnu.org; Wed, 25 Aug 2021 07:00:37 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1629889234; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=bzq6iZWC3RUvSniMXJvrslApm8yLzaYYlXZvBru7tvs=; b=ddT0lEFMpY5XQDZpO7tMFwaHp+BTlJDkSJL2ZSPBiliaJDMeX5mhSk+n5Orj6hE00foUOv hu4oYpXWUpOS77vM/o+nAdNTXLneamoG4X+Q/8ic21b72IClHPEdM7apMrH+6sZfL1vmrZ 4cQug1mMPmrlpc5kJAN53VztsE54E40= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-560-vXYBPbcIPIWHp9IPdBD7Yg-1; Wed, 25 Aug 2021 07:00:32 -0400 X-MC-Unique: vXYBPbcIPIWHp9IPdBD7Yg-1 Received: from smtp.corp.redhat.com (int-mx05.intmail.prod.int.phx2.redhat.com [10.5.11.15]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id BEE198799EB; Wed, 25 Aug 2021 11:00:31 +0000 (UTC) Received: from thuth.com (unknown [10.39.192.111]) by smtp.corp.redhat.com (Postfix) with ESMTP id C84BA5D741; Wed, 25 Aug 2021 11:00:30 +0000 (UTC) From: Thomas Huth To: qemu-devel@nongnu.org, Peter Maydell Subject: [PULL 4/6] docs/about/removed-features: Move some CLI options to the right location Date: Wed, 25 Aug 2021 13:00:16 +0200 Message-Id: <20210825110018.100913-5-thuth@redhat.com> In-Reply-To: <20210825110018.100913-1-thuth@redhat.com> References: <20210825110018.100913-1-thuth@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.15 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=thuth@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Transfer-Encoding: 8bit Content-Type: text/plain; charset="US-ASCII" Received-SPF: pass client-ip=170.10.133.124; envelope-from=thuth@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -34 X-Spam_score: -3.5 X-Spam_bar: --- X-Spam_report: (-3.5 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.745, 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_H2=-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: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" Some of the removed CLI options have been added to the wrong section in the "Removed features" chapter - they've been put into the "Related binaries" section instead. Move them now into the correct "System emulator command line arguments" section. Message-Id: <20210818112908.102205-1-thuth@redhat.com> Signed-off-by: Thomas Huth --- docs/about/removed-features.rst | 124 ++++++++++++++++---------------- 1 file changed, 61 insertions(+), 63 deletions(-) diff --git a/docs/about/removed-features.rst b/docs/about/removed-features.rst index 8feeead449..08f9e625ce 100644 --- a/docs/about/removed-features.rst +++ b/docs/about/removed-features.rst @@ -146,12 +146,73 @@ Replaced by ``-rtc base=date``. The "tls-creds" option should be used instead to point to a "tls-creds-x509" object created using "-object". +``-mem-path`` fallback to RAM (removed in 5.0) +'''''''''''''''''''''''''''''''''''''''''''''' + +If guest RAM allocation from file pointed by ``mem-path`` failed, +QEMU was falling back to allocating from RAM, which might have resulted +in unpredictable behavior since the backing file specified by the user +as ignored. Currently, users are responsible for making sure the backing storage +specified with ``-mem-path`` can actually provide the guest RAM configured with +``-m`` and QEMU fails to start up if RAM allocation is unsuccessful. + ``-net ...,name=...`` (removed in 5.1) '''''''''''''''''''''''''''''''''''''' The ``name`` parameter of the ``-net`` option was a synonym for the ``id`` parameter, which should now be used instead. +``-numa node,mem=...`` (removed in 5.1) +''''''''''''''''''''''''''''''''''''''' + +The parameter ``mem`` of ``-numa node`` was used to assign a part of guest RAM +to a NUMA node. But when using it, it's impossible to manage a specified RAM +chunk on the host side (like bind it to a host node, setting bind policy, ...), +so the guest ends up with the fake NUMA configuration with suboptiomal +performance. +However since 2014 there is an alternative way to assign RAM to a NUMA node +using parameter ``memdev``, which does the same as ``mem`` and adds +means to actually manage node RAM on the host side. Use parameter ``memdev`` +with *memory-backend-ram* backend as replacement for parameter ``mem`` +to achieve the same fake NUMA effect or a properly configured +*memory-backend-file* backend to actually benefit from NUMA configuration. +New machine versions (since 5.1) will not accept the option but it will still +work with old machine types. User can check the QAPI schema to see if the legacy +option is supported by looking at MachineInfo::numa-mem-supported property. + +``-numa`` node (without memory specified) (removed in 5.2) +'''''''''''''''''''''''''''''''''''''''''''''''''''''''''' + +Splitting RAM by default between NUMA nodes had the same issues as ``mem`` +parameter with the difference that the role of the user plays QEMU using +implicit generic or board specific splitting rule. +Use ``memdev`` with *memory-backend-ram* backend or ``mem`` (if +it's supported by used machine type) to define mapping explicitly instead. +Users of existing VMs, wishing to preserve the same RAM distribution, should +configure it explicitly using ``-numa node,memdev`` options. Current RAM +distribution can be retrieved using HMP command ``info numa`` and if separate +memory devices (pc|nv-dimm) are present use ``info memory-device`` and subtract +device memory from output of ``info numa``. + +``-smp`` (invalid topologies) (removed in 5.2) +'''''''''''''''''''''''''''''''''''''''''''''' + +CPU topology properties should describe whole machine topology including +possible CPUs. + +However, historically it was possible to start QEMU with an incorrect topology +where *n* <= *sockets* * *cores* * *threads* < *maxcpus*, +which could lead to an incorrect topology enumeration by the guest. +Support for invalid topologies is removed, the user must ensure +topologies described with -smp include all possible cpus, i.e. +*sockets* * *cores* * *threads* = *maxcpus*. + +``-machine enforce-config-section=on|off`` (removed in 5.2) +''''''''''''''''''''''''''''''''''''''''''''''''''''''''''' + +The ``enforce-config-section`` property was replaced by the +``-global migration.send-configuration={on|off}`` option. + ``-no-kvm`` (removed in 5.2) '''''''''''''''''''''''''''' @@ -590,69 +651,6 @@ enforce that any failure to open the backing image (including if the backing file is missing or an incorrect format was specified) is an error when ``-u`` is not used. -Command line options --------------------- - -``-smp`` (invalid topologies) (removed in 5.2) -'''''''''''''''''''''''''''''''''''''''''''''' - -CPU topology properties should describe whole machine topology including -possible CPUs. - -However, historically it was possible to start QEMU with an incorrect topology -where *n* <= *sockets* * *cores* * *threads* < *maxcpus*, -which could lead to an incorrect topology enumeration by the guest. -Support for invalid topologies is removed, the user must ensure -topologies described with -smp include all possible cpus, i.e. -*sockets* * *cores* * *threads* = *maxcpus*. - -``-numa`` node (without memory specified) (removed in 5.2) -'''''''''''''''''''''''''''''''''''''''''''''''''''''''''' - -Splitting RAM by default between NUMA nodes had the same issues as ``mem`` -parameter with the difference that the role of the user plays QEMU using -implicit generic or board specific splitting rule. -Use ``memdev`` with *memory-backend-ram* backend or ``mem`` (if -it's supported by used machine type) to define mapping explicitly instead. -Users of existing VMs, wishing to preserve the same RAM distribution, should -configure it explicitly using ``-numa node,memdev`` options. Current RAM -distribution can be retrieved using HMP command ``info numa`` and if separate -memory devices (pc|nv-dimm) are present use ``info memory-device`` and subtract -device memory from output of ``info numa``. - -``-numa node,mem=``\ *size* (removed in 5.1) -'''''''''''''''''''''''''''''''''''''''''''' - -The parameter ``mem`` of ``-numa node`` was used to assign a part of -guest RAM to a NUMA node. But when using it, it's impossible to manage a specified -RAM chunk on the host side (like bind it to a host node, setting bind policy, ...), -so the guest ends up with the fake NUMA configuration with suboptiomal performance. -However since 2014 there is an alternative way to assign RAM to a NUMA node -using parameter ``memdev``, which does the same as ``mem`` and adds -means to actually manage node RAM on the host side. Use parameter ``memdev`` -with *memory-backend-ram* backend as replacement for parameter ``mem`` -to achieve the same fake NUMA effect or a properly configured -*memory-backend-file* backend to actually benefit from NUMA configuration. -New machine versions (since 5.1) will not accept the option but it will still -work with old machine types. User can check the QAPI schema to see if the legacy -option is supported by looking at MachineInfo::numa-mem-supported property. - -``-mem-path`` fallback to RAM (removed in 5.0) -'''''''''''''''''''''''''''''''''''''''''''''' - -If guest RAM allocation from file pointed by ``mem-path`` failed, -QEMU was falling back to allocating from RAM, which might have resulted -in unpredictable behavior since the backing file specified by the user -as ignored. Currently, users are responsible for making sure the backing storage -specified with ``-mem-path`` can actually provide the guest RAM configured with -``-m`` and QEMU fails to start up if RAM allocation is unsuccessful. - -``-machine enforce-config-section=on|off`` (removed in 5.2) -''''''''''''''''''''''''''''''''''''''''''''''''''''''''''' - -The ``enforce-config-section`` property was replaced by the -``-global migration.send-configuration={on|off}`` option. - qemu-img amend to adjust backing file (removed in 6.1) '''''''''''''''''''''''''''''''''''''''''''''''''''''' -- 2.27.0