From patchwork Sat Oct 29 22:43:00 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Gavin Shan X-Patchwork-Id: 13024817 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 9AAE6C433FE for ; Sat, 29 Oct 2022 22:45:22 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1oouY4-0003TN-DT; Sat, 29 Oct 2022 18:43:28 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1oouY2-0003So-MM for qemu-devel@nongnu.org; Sat, 29 Oct 2022 18:43:26 -0400 Received: from us-smtp-delivery-124.mimecast.com ([170.10.133.124]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1oouY0-0002Q1-R6 for qemu-devel@nongnu.org; Sat, 29 Oct 2022 18:43:26 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1667083404; 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=NklmTCly+O2jixEBqYygzCH7H/fTKXf/Ut3Ljc4qBms=; b=Cdh0OBtRMsEFc+lxB/cmpnKlKtMW5JETysurkdO871TUiQMydC/xwjABPz2DjZFi/g5aU5 H8PFyTYd3ooI9Cm4KCd6Wvec7wGd0DNp2M/XpsdL1JOvesT8grPyVN8qveF2u+qcFVLQ+t TYasnBbcIBR7p5IFTC7oC+PfKDw1Pn4= Received: from mimecast-mx02.redhat.com (mx3-rdu2.redhat.com [66.187.233.73]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-360-mZ06fn4bOq6OI73lqXkTAA-1; Sat, 29 Oct 2022 18:43:18 -0400 X-MC-Unique: mZ06fn4bOq6OI73lqXkTAA-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 7D1263C02192; Sat, 29 Oct 2022 22:43:18 +0000 (UTC) Received: from gshan.redhat.com (vpn2-54-151.bne.redhat.com [10.64.54.151]) by smtp.corp.redhat.com (Postfix) with ESMTP id 2A7642027062; Sat, 29 Oct 2022 22:43:14 +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, richard.henderson@linaro.org, peter.maydell@linaro.org, zhenyzha@redhat.com, shan.gavin@gmail.com Subject: [PATCH v7 0/7] hw/arm/virt: Improve address assignment for high memory regions Date: Sun, 30 Oct 2022 06:43:00 +0800 Message-Id: <20221029224307.138822-1-gshan@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.1 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: -25 X-Spam_score: -2.6 X-Spam_bar: -- X-Spam_report: (-2.6 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.516, 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_H2=-0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=unavailable 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: , Sender: "Qemu-devel" Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org 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 and introduces new properties for user to selectively disable those 3 high memory regions. PATCH[1-4] preparatory work for the improvment PATCH[5] improve high memory region address assignment PATCH[6] adds 'compact-highmem' to enable or disable the optimization PATCH[7] adds properties so that high memory regions can be disabled v6: https://lists.nongnu.org/archive/html/qemu-arm/2022-10/msg00490.html v5: https://lists.nongnu.org/archive/html/qemu-arm/2022-10/msg00280.html v4: https://lists.nongnu.org/archive/html/qemu-arm/2022-10/msg00067.html v3: https://lists.nongnu.org/archive/html/qemu-arm/2022-09/msg00258.html v2: https://lore.kernel.org/all/20220815062958.100366-1-gshan@redhat.com/T/ v1: https://lists.nongnu.org/archive/html/qemu-arm/2022-08/msg00013.html Changelog ========== v7: * Pick review-by from Connie/Eric/Marc (Connie/Eric/Marc) * Use 'base - 1' to update 'vms->highest_gpa' in PATCH[v7 5] (Eric) * Replace 'even' with 'even if' in the comments about the legacy and compact layout in PATCH[v7 6] (Connie) * The maximal supported CPUs are calculated based on property 'highmem-redists' and the improved comments and error messages for this property (Connie) v6: * Pick review-by from Connie/Eric (Connie/Eric) * Make the changes obvious in PATCH[v6 5/7] (Eric) * Move the example to commit log and describe the legacy and compact layout in code's comments in PATCH[v6 6/7] (Eric) * Comment and commit message improvements (Connie/Eric) * Add 3 properties in PATCH[v6 7/7], allowing user to disable those 3 high memory regions (Marc) v5: * Pick review-by and tested-by (Connie/Zhenyu) * Add extra check in PATCH[v5 4/6] (Connie) * Improve comments about compatibility for disabled regions in PATCH[v5 5/6] (Connie) v4: * Add virt_get_high_memmap_enabled() helper (Eric) * Move 'vms->highmem_compact' and related logic from PATCH[v4 6/6] to PATCH[v4 5/6] to avoid git-bisect breakage (Eric) * Document the legacy and optimized high memory region layout in commit log and source code (Eric) v3: * Reorder the patches (Gavin) * Add 'highmem-compact' property for backwards compatibility (Eric) v2: * Split the patches for easier review (Gavin) * Improved changelog (Marc) * Use 'bool fits' in virt_set_high_memmap() (Eric) Gavin Shan (7): hw/arm/virt: Introduce virt_set_high_memmap() helper hw/arm/virt: Rename variable size to region_size in virt_set_high_memmap() hw/arm/virt: Introduce variable region_base in virt_set_high_memmap() hw/arm/virt: Introduce virt_get_high_memmap_enabled() helper hw/arm/virt: Improve high memory region address assignment hw/arm/virt: Add 'compact-highmem' property hw/arm/virt: Add properties to disable high memory regions docs/system/arm/virt.rst | 17 ++++ hw/arm/virt.c | 193 ++++++++++++++++++++++++++++++++------- include/hw/arm/virt.h | 2 + 3 files changed, 177 insertions(+), 35 deletions(-)