From patchwork Tue Oct 4 00:26:21 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Gavin Shan X-Patchwork-Id: 12997896 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 C36DCC433FE for ; Tue, 4 Oct 2022 00:31:54 +0000 (UTC) Received: from localhost ([::1]:54530 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1ofVqj-00034c-PL for qemu-devel@archiver.kernel.org; Mon, 03 Oct 2022 20:31:53 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:50012) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1ofVlj-0007on-GL for qemu-devel@nongnu.org; Mon, 03 Oct 2022 20:26:43 -0400 Received: from us-smtp-delivery-124.mimecast.com ([170.10.133.124]:58476) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1ofVlf-0004r6-Cu for qemu-devel@nongnu.org; Mon, 03 Oct 2022 20:26:40 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1664843197; 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=0I/lEiOBQ3COXqfsbRBTyni/ySvMDvCrmKW7u9qW9ZA=; b=SHPPf8y4beuHGgb5urE2RUIbCcZr8Qx1NamYbLArUVR+A4Twvsa+9+e4zjHaROj8qvUHxl 3XmTg3Js+1+GFdsK3ZlsuWUOj1EVWWTsX8Gd1NNwmbtw3jVLarqIoflCOG389L1W6HTG5z 3V8MG+0FdlHXAqaXuX8NgAbOEAPpsog= 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-68-opumObTUO9GHnQRQECEEvQ-1; Mon, 03 Oct 2022 20:26:34 -0400 X-MC-Unique: opumObTUO9GHnQRQECEEvQ-1 Received: from smtp.corp.redhat.com (int-mx01.intmail.prod.int.rdu2.redhat.com [10.11.54.1]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id F2BA71C05197; Tue, 4 Oct 2022 00:26:33 +0000 (UTC) Received: from gshan.redhat.com (vpn2-54-56.bne.redhat.com [10.64.54.56]) by smtp.corp.redhat.com (Postfix) with ESMTP id 9D84F40C206B; Tue, 4 Oct 2022 00:26:30 +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, richard.henderson@linaro.org, peter.maydell@linaro.org, shan.gavin@gmail.com Subject: [PATCH v4 0/6] hw/arm/virt: Improve address assignment for high memory regions Date: Tue, 4 Oct 2022 08:26:21 +0800 Message-Id: <20221004002627.59172-1-gshan@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.1 on 10.11.54.1 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: -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, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 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[1-4] preparatory work for the improvment PATCH[5] improve high memory region address assignment PATCH[6] adds 'compact-highmem' to enable or disable the optimization History ======= 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 ========== 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 (6): 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 hw/arm/virt: Add 'compact-highmem' property docs/system/arm/virt.rst | 4 ++ hw/arm/virt.c | 131 +++++++++++++++++++++++++++++---------- include/hw/arm/virt.h | 2 + 3 files changed, 104 insertions(+), 33 deletions(-)