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=-8.3 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, 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 6A72BC3F2CD for ; Tue, 3 Mar 2020 10:29:35 +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 44036214D8 for ; Tue, 3 Mar 2020 10:29:35 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 44036214D8 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]:45014 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1j94nu-0000bl-G6 for qemu-devel@archiver.kernel.org; Tue, 03 Mar 2020 05:29:34 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]:54609) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1j94e0-0001Ih-5p for qemu-devel@nongnu.org; Tue, 03 Mar 2020 05:19:21 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1j94dy-0001c8-NL for qemu-devel@nongnu.org; Tue, 03 Mar 2020 05:19:19 -0500 Received: from 18.mo1.mail-out.ovh.net ([46.105.35.72]:55735) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1j94dy-0001aM-A8 for qemu-devel@nongnu.org; Tue, 03 Mar 2020 05:19:18 -0500 Received: from player788.ha.ovh.net (unknown [10.110.103.112]) by mo1.mail-out.ovh.net (Postfix) with ESMTP id ADD421B3D04 for ; Tue, 3 Mar 2020 11:19:14 +0100 (CET) Received: from kaod.org (lns-bzn-46-82-253-208-248.adsl.proxad.net [82.253.208.248]) (Authenticated sender: groug@kaod.org) by player788.ha.ovh.net (Postfix) with ESMTPSA id C385B1005FCB2; Tue, 3 Mar 2020 10:18:51 +0000 (UTC) Date: Tue, 3 Mar 2020 11:18:49 +0100 From: Greg Kurz To: David Gibson Subject: Re: [PATCH v7 16/17] spapr: Clean up RMA size calculation Message-ID: <20200303111849.361b741a@bahia.home> In-Reply-To: <20200303034351.333043-17-david@gibson.dropbear.id.au> References: <20200303034351.333043-1-david@gibson.dropbear.id.au> <20200303034351.333043-17-david@gibson.dropbear.id.au> X-Mailer: Claws Mail 3.17.4 (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: 3396277069955373542 X-VR-SPAMSTATE: OK X-VR-SPAMSCORE: -100 X-VR-SPAMCAUSE: gggruggvucftvghtrhhoucdtuddrgedugedruddtiedgudehucetufdoteggodetrfdotffvucfrrhhofhhilhgvmecuqfggjfdpvefjgfevmfevgfenuceurghilhhouhhtmecuhedttdenucesvcftvggtihhpihgvnhhtshculddquddttddmnecujfgurhepfffhvffukfgjfhfogggtgfesthejredtredtvdenucfhrhhomhepifhrvghgucfmuhhriicuoehgrhhouhhgsehkrghougdrohhrgheqnecukfhppedtrddtrddtrddtpdekvddrvdehfedrvddtkedrvdegkeenucevlhhushhtvghrufhiiigvpedtnecurfgrrhgrmhepmhhouggvpehsmhhtphdqohhuthdphhgvlhhopehplhgrhigvrhejkeekrdhhrgdrohhvhhdrnhgvthdpihhnvghtpedtrddtrddtrddtpdhmrghilhhfrhhomhepghhrohhugheskhgrohgurdhorhhgpdhrtghpthhtohepqhgvmhhuqdguvghvvghlsehnohhnghhnuhdrohhrgh X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 46.105.35.72 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: lvivier@redhat.com, Thomas Huth , Xiao Guangrong , farosas@linux.ibm.com, aik@ozlabs.ru, "Michael S. Tsirkin" , Mark Cave-Ayland , qemu-devel@nongnu.org, Paolo Bonzini , qemu-ppc@nongnu.org, clg@kaod.org, Igor Mammedov , "Edgar E. Iglesias" , paulus@samba.org Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On Tue, 3 Mar 2020 14:43:50 +1100 David Gibson wrote: > Move the calculation of the Real Mode Area (RMA) size into a helper > function. While we're there clean it up and correct it in a few ways: > * Add comments making it clearer where the various constraints come from > * Remove a pointless check that the RMA fits within Node 0 (we've just > clamped it so that it does) > > Signed-off-by: David Gibson > --- Reviewed-by: Greg Kurz > hw/ppc/spapr.c | 60 ++++++++++++++++++++++++++++++-------------------- > 1 file changed, 36 insertions(+), 24 deletions(-) > > diff --git a/hw/ppc/spapr.c b/hw/ppc/spapr.c > index 95bda4a615..2eb0d8f70d 100644 > --- a/hw/ppc/spapr.c > +++ b/hw/ppc/spapr.c > @@ -2648,6 +2648,41 @@ static PCIHostState *spapr_create_default_phb(void) > return PCI_HOST_BRIDGE(dev); > } > > +static hwaddr spapr_rma_size(SpaprMachineState *spapr, Error **errp) > +{ > + MachineState *machine = MACHINE(spapr); > + SpaprMachineClass *smc = SPAPR_MACHINE_GET_CLASS(spapr); > + hwaddr rma_size = machine->ram_size; > + hwaddr node0_size = spapr_node0_size(machine); > + > + /* RMA has to fit in the first NUMA node */ > + rma_size = MIN(rma_size, node0_size); > + > + /* > + * VRMA access is via a special 1TiB SLB mapping, so the RMA can > + * never exceed that > + */ > + rma_size = MIN(rma_size, 1 * TiB); > + > + /* > + * Clamp the RMA size based on machine type. This is for > + * migration compatibility with older qemu versions, which limited > + * the RMA size for complicated and mostly bad reasons. > + */ > + if (smc->rma_limit) { > + rma_size = MIN(rma_size, smc->rma_limit); > + } > + > + if (rma_size < MIN_RMA_SLOF) { > + error_setg(errp, > +"pSeries SLOF firmware requires >= %ldMiB guest RMA (Real Mode Area memory)", > + MIN_RMA_SLOF / MiB); > + return 0; > + } > + > + return rma_size; > +} > + > /* pSeries LPAR / sPAPR hardware init */ > static void spapr_machine_init(MachineState *machine) > { > @@ -2659,7 +2694,6 @@ static void spapr_machine_init(MachineState *machine) > PCIHostState *phb; > int i; > MemoryRegion *sysmem = get_system_memory(); > - hwaddr node0_size = spapr_node0_size(machine); > long load_limit, fw_size; > char *filename; > Error *resize_hpt_err = NULL; > @@ -2699,22 +2733,7 @@ static void spapr_machine_init(MachineState *machine) > exit(1); > } > > - spapr->rma_size = node0_size; > - > - /* > - * Clamp the RMA size based on machine type. This is for > - * migration compatibility with older qemu versions, which limited > - * the RMA size for complicated and mostly bad reasons. > - */ > - if (smc->rma_limit) { > - spapr->rma_size = MIN(spapr->rma_size, smc->rma_limit); > - } > - > - if (spapr->rma_size > node0_size) { > - error_report("Numa node 0 has to span the RMA (%#08"HWADDR_PRIx")", > - spapr->rma_size); > - exit(1); > - } > + spapr->rma_size = spapr_rma_size(spapr, &error_fatal); > > /* Setup a load limit for the ramdisk leaving room for SLOF and FDT */ > load_limit = MIN(spapr->rma_size, RTAS_MAX_ADDR) - FW_OVERHEAD; > @@ -2951,13 +2970,6 @@ static void spapr_machine_init(MachineState *machine) > } > } > > - if (spapr->rma_size < MIN_RMA_SLOF) { > - error_report( > - "pSeries SLOF firmware requires >= %ldMiB guest RMA (Real Mode Area memory)", > - MIN_RMA_SLOF / MiB); > - exit(1); > - } > - > if (kernel_filename) { > uint64_t lowaddr = 0; >