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=-8.2 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,USER_AGENT_SANE_2 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 6F89FC433DF for ; Fri, 5 Jun 2020 16:49:37 +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 44C3B206F0 for ; Fri, 5 Jun 2020 16:49:37 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 44C3B206F0 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=kaod.org Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Received: from localhost ([::1]:42610 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1jhFXE-0008UH-Gq for qemu-devel@archiver.kernel.org; Fri, 05 Jun 2020 12:49:36 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:40150) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1jhFWC-0007XF-HV for qemu-devel@nongnu.org; Fri, 05 Jun 2020 12:48:32 -0400 Received: from 11.mo6.mail-out.ovh.net ([188.165.38.119]:60615) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1jhFWA-00015n-CL for qemu-devel@nongnu.org; Fri, 05 Jun 2020 12:48:32 -0400 Received: from player732.ha.ovh.net (unknown [10.110.208.44]) by mo6.mail-out.ovh.net (Postfix) with ESMTP id 1A533211306 for ; Fri, 5 Jun 2020 18:48:19 +0200 (CEST) Received: from kaod.org (lns-bzn-46-82-253-208-248.adsl.proxad.net [82.253.208.248]) (Authenticated sender: groug@kaod.org) by player732.ha.ovh.net (Postfix) with ESMTPSA id B00C312F8DE81; Fri, 5 Jun 2020 16:47:59 +0000 (UTC) Authentication-Results: garm.ovh; auth=pass (GARM-96R00171f0a97b-1de5-4267-aee7-336a0a374b76,78B6A409CB68D4ADAA3DD5D4BC07D4D8F234AD6B) smtp.auth=groug@kaod.org Date: Fri, 5 Jun 2020 18:47:58 +0200 From: Greg Kurz To: Igor Mammedov Subject: Re: [PATCH v3] numa: forbid '-numa node, mem' for 5.1 and newer machine types Message-ID: <20200605184758.6a7aa3ef@bahia> In-Reply-To: <20200605160321.671964-1-imammedo@redhat.com> References: <20200605160321.671964-1-imammedo@redhat.com> X-Mailer: Claws Mail 3.17.5 (GTK+ 2.24.32; x86_64-redhat-linux-gnu) MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-Ovh-Tracer-Id: 8598216115286284654 X-VR-SPAMSTATE: OK X-VR-SPAMSCORE: -100 X-VR-SPAMCAUSE: gggruggvucftvghtrhhoucdtuddrgeduhedrudegfedgledvucetufdoteggodetrfdotffvucfrrhhofhhilhgvmecuqfggjfdpvefjgfevmfevgfenuceurghilhhouhhtmecuhedttdenucesvcftvggtihhpihgvnhhtshculddquddttddmnecujfgurhepfffhvffukfgjfhfogggtgfesthejredtredtvdenucfhrhhomhepifhrvghgucfmuhhriicuoehgrhhouhhgsehkrghougdrohhrgheqnecuggftrfgrthhtvghrnhepheekhfdtheegheehjeeludefkefhvdelfedvieehhfekhfdufffhueeuvdfftdfhnecukfhppedtrddtrddtrddtpdekvddrvdehfedrvddtkedrvdegkeenucevlhhushhtvghrufhiiigvpedtnecurfgrrhgrmhepmhhouggvpehsmhhtphdqohhuthdphhgvlhhopehplhgrhigvrhejfedvrdhhrgdrohhvhhdrnhgvthdpihhnvghtpedtrddtrddtrddtpdhmrghilhhfrhhomhepghhrohhugheskhgrohgurdhorhhgpdhrtghpthhtohepqhgvmhhuqdguvghvvghlsehnohhnghhnuhdrohhrgh Received-SPF: pass client-ip=188.165.38.119; envelope-from=groug@kaod.org; helo=11.mo6.mail-out.ovh.net X-detected-operating-system: by eggs.gnu.org: First seen = 2020/06/05 12:48:21 X-ACL-Warn: Detected OS = Linux 3.11 and newer X-Spam_score_int: -18 X-Spam_score: -1.9 X-Spam_bar: - X-Spam_report: (-1.9 / 5.0 requ) BAYES_00=-1.9, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H3=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001 autolearn=_AUTOLEARN 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: peter.maydell@linaro.org, ehabkost@redhat.com, mst@redhat.com, libvir-list@redhat.com, Michal Privoznik , qemu-devel@nongnu.org, qemu-arm@nongnu.org, qemu-ppc@nongnu.org, pbonzini@redhat.com, rth@twiddle.net, david@gibson.dropbear.id.au Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On Fri, 5 Jun 2020 12:03:21 -0400 Igor Mammedov wrote: > Deprecation period is run out and it's a time to flip the switch > introduced by cd5ff8333a. Disable legacy option for new machine > types (since 5.1) and amend documentation. > > '-numa node,memdev' shall be used instead of disabled option > with new machine types. > > Signed-off-by: Igor Mammedov > Reviewed-by: Michal Privoznik > --- > v1: > - rebased on top of current master > - move compat mode from 4.2 to 5.0 > v2: > - move deprection text to recently removed section > v3: > - increase title line length for (deprecated.rst) > '``-numa node,mem=``\ *size* (removed in 5.1)' > > CC: peter.maydell@linaro.org > CC: ehabkost@redhat.com > CC: marcel.apfelbaum@gmail.com > CC: mst@redhat.com > CC: pbonzini@redhat.com > CC: rth@twiddle.net > CC: david@gibson.dropbear.id.au > CC: libvir-list@redhat.com > CC: qemu-arm@nongnu.org > CC: qemu-ppc@nongnu.org > --- > docs/system/deprecated.rst | 37 ++++++++++++++++++++----------------- > hw/arm/virt.c | 2 +- > hw/core/numa.c | 6 ++++++ > hw/i386/pc.c | 1 - > hw/i386/pc_piix.c | 1 + > hw/i386/pc_q35.c | 1 + > hw/ppc/spapr.c | 2 +- > qemu-options.hx | 9 +++++---- > 8 files changed, 35 insertions(+), 24 deletions(-) > > diff --git a/docs/system/deprecated.rst b/docs/system/deprecated.rst > index f0061f94aa..502e41ff35 100644 > --- a/docs/system/deprecated.rst > +++ b/docs/system/deprecated.rst > @@ -101,23 +101,6 @@ error in the future. > The ``-realtime mlock=on|off`` argument has been replaced by the > ``-overcommit mem-lock=on|off`` argument. > > -``-numa node,mem=``\ *size* (since 4.1) > -''''''''''''''''''''''''''''''''''''''' > - > -The parameter ``mem`` of ``-numa node`` is used to assign a part of > -guest RAM to a NUMA node. But when using it, it's impossible to manage specified > -RAM chunk on the host side (like bind it to a host node, setting bind policy, ...), > -so guest end-ups 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 actualy manage node RAM on the host side. Use parameter ``memdev`` > -with *memory-backend-ram* backend as an 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. > -In future new machine versions will not accept the option but it will still > -work with old machine types. User can check QAPI schema to see if the legacy > -option is supported by looking at MachineInfo::numa-mem-supported property. > - > ``-numa`` node (without memory specified) (since 4.1) > ''''''''''''''''''''''''''''''''''''''''''''''''''''' > > @@ -512,3 +495,23 @@ long starting at 1MiB, the old command:: > can be rewritten as:: > > qemu-nbd -t --image-opts driver=raw,offset=1M,size=100M,file.driver=qcow2,file.file.driver=file,file.file.filename=file.qcow2 > + > +Command line options > +-------------------- > + > +``-numa node,mem=``\ *size* (removed in 5.1) > +'''''''''''''''''''''''''''''''''''''''''''' > + > +The parameter ``mem`` of ``-numa node`` is used to assign a part of > +guest RAM to a NUMA node. But when using it, it's impossible to manage specified > +RAM chunk on the host side (like bind it to a host node, setting bind policy, ...), > +so guest end-ups 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 actualy manage node RAM on the host side. Use parameter ``memdev`` > +with *memory-backend-ram* backend as an 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. > +In future new machine versions will not accept the option but it will still > +work with old machine types. User can check QAPI schema to see if the legacy > +option is supported by looking at MachineInfo::numa-mem-supported property. > diff --git a/hw/arm/virt.c b/hw/arm/virt.c > index 37462a6f78..063d4703f7 100644 > --- a/hw/arm/virt.c > +++ b/hw/arm/virt.c > @@ -2262,7 +2262,6 @@ static void virt_machine_class_init(ObjectClass *oc, void *data) > hc->pre_plug = virt_machine_device_pre_plug_cb; > hc->plug = virt_machine_device_plug_cb; > hc->unplug_request = virt_machine_device_unplug_request_cb; > - mc->numa_mem_supported = true; > mc->nvdimm_supported = true; > mc->auto_enable_numa_with_memhp = true; > mc->default_ram_id = "mach-virt.ram"; > @@ -2375,6 +2374,7 @@ DEFINE_VIRT_MACHINE_AS_LATEST(5, 1) > static void virt_machine_5_0_options(MachineClass *mc) > { > virt_machine_5_1_options(mc); > + mc->numa_mem_supported = true; > } > DEFINE_VIRT_MACHINE(5, 0) > > diff --git a/hw/core/numa.c b/hw/core/numa.c > index 316bc50d75..05be412e59 100644 > --- a/hw/core/numa.c > +++ b/hw/core/numa.c > @@ -117,6 +117,12 @@ static void parse_numa_node(MachineState *ms, NumaNodeOptions *node, > } > > if (node->has_mem) { > + if (!mc->numa_mem_supported) { > + error_setg(errp, "Parameter -numa node,mem is not supported by this" > + " machine type. Use -numa node,memdev instead"); What about using error_append_hint() for the hint part ? > + return; > + } > + > numa_info[nodenr].node_mem = node->mem; > if (!qtest_enabled()) { > warn_report("Parameter -numa node,mem is deprecated," > diff --git a/hw/i386/pc.c b/hw/i386/pc.c > index 2128f3d6fe..a86136069c 100644 > --- a/hw/i386/pc.c > +++ b/hw/i386/pc.c > @@ -1960,7 +1960,6 @@ static void pc_machine_class_init(ObjectClass *oc, void *data) > hc->unplug = pc_machine_device_unplug_cb; > mc->default_cpu_type = TARGET_DEFAULT_CPU_TYPE; > mc->nvdimm_supported = true; > - mc->numa_mem_supported = true; > mc->default_ram_id = "pc.ram"; > > object_class_property_add(oc, PC_MACHINE_DEVMEM_REGION_SIZE, "int", > diff --git a/hw/i386/pc_piix.c b/hw/i386/pc_piix.c > index f66e1d73ce..8955436efa 100644 > --- a/hw/i386/pc_piix.c > +++ b/hw/i386/pc_piix.c > @@ -438,6 +438,7 @@ static void pc_i440fx_5_0_machine_options(MachineClass *m) > pc_i440fx_5_1_machine_options(m); > m->alias = NULL; > m->is_default = false; > + m->numa_mem_supported = true; > compat_props_add(m->compat_props, hw_compat_5_0, hw_compat_5_0_len); > compat_props_add(m->compat_props, pc_compat_5_0, pc_compat_5_0_len); > } > diff --git a/hw/i386/pc_q35.c b/hw/i386/pc_q35.c > index 4ba8ac8774..af6b32adb7 100644 > --- a/hw/i386/pc_q35.c > +++ b/hw/i386/pc_q35.c > @@ -366,6 +366,7 @@ static void pc_q35_5_0_machine_options(MachineClass *m) > { > pc_q35_5_1_machine_options(m); > m->alias = NULL; > + m->numa_mem_supported = true; > compat_props_add(m->compat_props, hw_compat_5_0, hw_compat_5_0_len); > compat_props_add(m->compat_props, pc_compat_5_0, pc_compat_5_0_len); > } > diff --git a/hw/ppc/spapr.c b/hw/ppc/spapr.c > index 3b1a5ed865..210d61d1b3 100644 > --- a/hw/ppc/spapr.c > +++ b/hw/ppc/spapr.c > @@ -4511,7 +4511,6 @@ static void spapr_machine_class_init(ObjectClass *oc, void *data) > * in which LMBs are represented and hot-added > */ > mc->numa_mem_align_shift = 28; > - mc->numa_mem_supported = true; > mc->auto_enable_numa = true; > > smc->default_caps.caps[SPAPR_CAP_HTM] = SPAPR_CAP_OFF; > @@ -4599,6 +4598,7 @@ static void spapr_machine_5_0_class_options(MachineClass *mc) > { > spapr_machine_5_1_class_options(mc); > compat_props_add(mc->compat_props, hw_compat_5_0, hw_compat_5_0_len); > + mc->numa_mem_supported = true; > } > > DEFINE_SPAPR_MACHINE(5_0, "5.0", false); > diff --git a/qemu-options.hx b/qemu-options.hx > index 93bde2bbc8..196f468786 100644 > --- a/qemu-options.hx > +++ b/qemu-options.hx > @@ -239,10 +239,11 @@ SRST > -numa node,nodeid=0 -numa node,nodeid=1 \ > -numa cpu,node-id=0,socket-id=0 -numa cpu,node-id=1,socket-id=1 > > - '\ ``mem``\ ' assigns a given RAM amount to a node. '\ ``memdev``\ ' > - assigns RAM from a given memory backend device to a node. If > - '\ ``mem``\ ' and '\ ``memdev``\ ' are omitted in all nodes, RAM is > - split equally between them. > + Legacy '\ ``mem``\ ' assigns a given RAM amount to a node (not supported > + for 5.1 and newer machine types). '\ ``memdev``\ ' assigns RAM from > + a given memory backend device to a node. If '\ ``mem``\ ' and > + '\ ``memdev``\ ' are omitted in all nodes, RAM is split equally between them. > + > > '\ ``mem``\ ' and '\ ``memdev``\ ' are mutually exclusive. > Furthermore, if one node uses '\ ``memdev``\ ', all of them have to