From patchwork Mon Aug 15 06:29:54 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Gavin Shan X-Patchwork-Id: 12943154 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org 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 smtp.lore.kernel.org (Postfix) with ESMTPS id 2B79FC00140 for ; Mon, 15 Aug 2022 06:39:33 +0000 (UTC) Received: from localhost ([::1]:34092 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1oNTl6-000429-1H for qemu-devel@archiver.kernel.org; Mon, 15 Aug 2022 02:39:32 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:51960) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1oNTcI-0000sj-SV for qemu-devel@nongnu.org; Mon, 15 Aug 2022 02:30:27 -0400 Received: from us-smtp-delivery-124.mimecast.com ([170.10.133.124]:21235) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1oNTcF-0000Ox-6u for qemu-devel@nongnu.org; Mon, 15 Aug 2022 02:30:24 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1660545021; 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; bh=t//RPkk8qsPy8JgZVz6T9NGR3ElCqof5zdv/H95KjT0=; b=GVf9QO8iiPVeewASCARUh96ybEbwMo7Sja6moHwERDkr98/RiCtIAAd3MrsBq7uFg+QJ3+ bbogJCrGyJAfVBDruxyykSzr8tJJJVb4yh0c10Bkx6UjDyhM3tqofR+vEKp24SkJ3SRHK2 Qqdx0FZU/UvUpHsq7onWETaqW4PunkE= Received: from mimecast-mx02.redhat.com (mimecast-mx02.redhat.com [66.187.233.88]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-332-anSrCpKSP0W1--1WrVo10Q-1; Mon, 15 Aug 2022 02:30:20 -0400 X-MC-Unique: anSrCpKSP0W1--1WrVo10Q-1 Received: from smtp.corp.redhat.com (int-mx04.intmail.prod.int.rdu2.redhat.com [10.11.54.4]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id CBECD8037AF; Mon, 15 Aug 2022 06:30:19 +0000 (UTC) Received: from gshan.redhat.com (vpn2-54-77.bne.redhat.com [10.64.54.77]) by smtp.corp.redhat.com (Postfix) with ESMTP id 968622026D64; Mon, 15 Aug 2022 06:30:16 +0000 (UTC) From: Gavin Shan To: qemu-arm@nongnu.org Cc: qemu-devel@nongnu.org, maz@kernel.org, eric.auger@redhat.com, cohuck@redhat.com, zhenyzha@redhat.com, peter.maydell@linaro.org, richard.henderson@linaro.org, shan.gavin@gmail.com Subject: [PATCH v2 0/4] hw/arm/virt: Improve address assignment for high memory regions Date: Mon, 15 Aug 2022 14:29:54 +0800 Message-Id: <20220815062958.100366-1-gshan@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.78 on 10.11.54.4 Received-SPF: pass client-ip=170.10.133.124; envelope-from=gshan@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -21 X-Spam_score: -2.2 X-Spam_bar: -- X-Spam_report: (-2.2 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.082, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 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" There are three high memory regions, which are VIRT_HIGH_REDIST2, VIRT_HIGH_PCIE_ECAM and VIRT_HIGH_PCIE_MMIO. Their base addresses are floating on highest RAM address. However, they can be disabled in several cases. (1) One specific high memory region is disabled by developer by toggling vms->highmem_{redists, ecam, mmio}. (2) VIRT_HIGH_PCIE_ECAM region is disabled on machine, which is 'virt-2.12' or ealier than it. (3) VIRT_HIGH_PCIE_ECAM region is disabled when firmware is loaded on 32-bits system. (4) One specific high memory region is disabled when it breaks the PA space limit. The current implementation of virt_set_memmap() isn't comprehensive because the space for one specific high memory region is always reserved from the PA space for case (1), (2) and (3). In the code, 'base' and 'vms->highest_gpa' are always increased for those three cases. It's unnecessary since the assigned space of the disabled high memory region won't be used afterwards. The series intends to improve the address assignment for these high memory regions: PATCH[1] and PATCH[2] are cleanup and preparatory works. PATCH[3] improves address assignment for these high memory regions PATCH[4] moves the address assignment logic into standalone helper History ======= v1: https://lists.nongnu.org/archive/html/qemu-arm/2022-08/msg00013.html Changelog ========= v2: * Split the patches for easier review (Gavin) * Improved changelog (Marc) * Use 'bool fits' in virt_set_high_memmap() (Eric) Gavin Shan (4): hw/arm/virt: Rename variable size to region_size in virt_set_memmap() hw/arm/virt: Introduce variable region_base in virt_set_memmap() hw/arm/virt: Improve address assignment for high memory regions virt/hw/virt: Add virt_set_high_memmap() helper hw/arm/virt.c | 84 ++++++++++++++++++++++++++++++--------------------- 1 file changed, 50 insertions(+), 34 deletions(-)