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=-6.6 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, 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 95266C433DF for ; Thu, 21 May 2020 09:30:56 +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 ECD242072C for ; Thu, 21 May 2020 09:30:55 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="XLTb0Z1h" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org ECD242072C 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]:39050 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1jbhXT-0006zp-6K for qemu-devel@archiver.kernel.org; Thu, 21 May 2020 05:30:55 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:57364) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1jbhWo-0006Ns-UP for qemu-devel@nongnu.org; Thu, 21 May 2020 05:30:14 -0400 Received: from us-smtp-2.mimecast.com ([207.211.31.81]:49817 helo=us-smtp-delivery-1.mimecast.com) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_CBC_SHA1:256) (Exim 4.90_1) (envelope-from ) id 1jbhWn-0000LZ-QW for qemu-devel@nongnu.org; Thu, 21 May 2020 05:30:14 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1590053412; 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: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=kRZr8uWaR23o4JQjTsLqMa/HlO+Ckw1tCxizbVtVWxw=; b=XLTb0Z1hgAlWHJ29rGHJplAaBxEs9LHcc9HgnkeQCth3sEhcnwQhCZjYaoCA7dM1EWwNBH qzn+vCjf2k9PL4iTY98UZgyP8H/yW2QegPHuyliHsakHympRoGfwT81ZAd7CSN0OfoVWiu bRenuXajDcw9Eg4mXBYLeKkllX5sQM0= 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-215-nTdUkN_7PlaWl6ITYZMkyQ-1; Thu, 21 May 2020 05:30:08 -0400 X-MC-Unique: nTdUkN_7PlaWl6ITYZMkyQ-1 Received: from smtp.corp.redhat.com (int-mx03.intmail.prod.int.phx2.redhat.com [10.5.11.13]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id AE1321923429; Thu, 21 May 2020 09:29:54 +0000 (UTC) Received: from localhost (unknown [10.40.208.12]) by smtp.corp.redhat.com (Postfix) with ESMTP id D0EBDA394E; Thu, 21 May 2020 09:29:23 +0000 (UTC) Date: Thu, 21 May 2020 11:29:21 +0200 From: Igor Mammedov To: Gerd Hoffmann Subject: Re: [PATCH v3 14/22] microvm: use 2G split unconditionally Message-ID: <20200521112921.641f12bb@redhat.com> In-Reply-To: <20200520132003.9492-15-kraxel@redhat.com> References: <20200520132003.9492-1-kraxel@redhat.com> <20200520132003.9492-15-kraxel@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.13 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Received-SPF: pass client-ip=207.211.31.81; envelope-from=imammedo@redhat.com; helo=us-smtp-delivery-1.mimecast.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/05/21 04:44:45 X-ACL-Warn: Detected OS = Linux 2.2.x-3.x [generic] [fuzzy] 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, DKIMWL_WL_HIGH=0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H4=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_PASS=-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 , Eduardo Habkost , Sergio Lopez , "Michael S. Tsirkin" , qemu-devel@nongnu.org, Shannon Zhao , qemu-arm@nongnu.org, Paolo Bonzini , Richard Henderson Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On Wed, 20 May 2020 15:19:55 +0200 Gerd Hoffmann wrote: > Looks like the logiv was copied over from q35. > > q35 does this for backward compatibility, there is no reason to do this > on microvm though. So split @ 2G unconditionally. not related to your ACPI rework, but just an idea for future of microvm I wonder if we should carry over all this fixed RAM layout legacy from pc/q35 with a bunch of knobs to tweak it (along with complicated logic). Can we just re-use pc-dimms for main RAM and let user specify RAM layout the way they wish? > Signed-off-by: Gerd Hoffmann > --- > hw/i386/microvm.c | 16 +--------------- > 1 file changed, 1 insertion(+), 15 deletions(-) > > diff --git a/hw/i386/microvm.c b/hw/i386/microvm.c > index 867d3d652145..b8f0d3283758 100644 > --- a/hw/i386/microvm.c > +++ b/hw/i386/microvm.c > @@ -170,23 +170,9 @@ static void microvm_memory_init(MicrovmMachineState *mms) > MemoryRegion *ram_below_4g, *ram_above_4g; > MemoryRegion *system_memory = get_system_memory(); > FWCfgState *fw_cfg; > - ram_addr_t lowmem; > + ram_addr_t lowmem = 0x80000000; /* 2G */ > int i; > > - /* > - * Check whether RAM fits below 4G (leaving 1/2 GByte for IO memory > - * and 256 Mbytes for PCI Express Enhanced Configuration Access Mapping > - * also known as MMCFG). > - * If it doesn't, we need to split it in chunks below and above 4G. > - * In any case, try to make sure that guest addresses aligned at > - * 1G boundaries get mapped to host addresses aligned at 1G boundaries. > - */ > - if (machine->ram_size >= 0xb0000000) { > - lowmem = 0x80000000; > - } else { > - lowmem = 0xb0000000; > - } > - > /* > * Handle the machine opt max-ram-below-4g. It is basically doing > * min(qemu limit, user limit).