From patchwork Wed Sep 21 23:13:48 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Gavin Shan X-Patchwork-Id: 12984299 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 1E12AECAAD8 for ; Wed, 21 Sep 2022 23:18:42 +0000 (UTC) Received: from localhost ([::1]:48466 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1ob8zJ-0003X6-31 for qemu-devel@archiver.kernel.org; Wed, 21 Sep 2022 19:18:41 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:54490) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1ob8v4-000065-KX for qemu-devel@nongnu.org; Wed, 21 Sep 2022 19:14:18 -0400 Received: from us-smtp-delivery-124.mimecast.com ([170.10.133.124]:23758) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1ob8v3-0001sr-25 for qemu-devel@nongnu.org; Wed, 21 Sep 2022 19:14:18 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1663802056; 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=Sv6gjcFNmp354tzRnNVqsmaz0Eb5IUn+dcydFYKMH/o=; b=OiUR7kNIdlOMOoKtkfmbL/YW3lhP10/qUz4x8BkYjZjklLjtDd6ajTBYjNn143dTkYKW1B nVcY6k84s9WY2ubD+4gOIGwzj5YnH9zq24SHgKl5rUFow+cM/wD7PrToLc+rNcAAgmWxS1 t9Kg6XFQk4ug23Yaw3BGSCChCm+XFo4= 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-580-t76h502BNOOuknaDTC2yZg-1; Wed, 21 Sep 2022 19:14:13 -0400 X-MC-Unique: t76h502BNOOuknaDTC2yZg-1 Received: from smtp.corp.redhat.com (int-mx06.intmail.prod.int.rdu2.redhat.com [10.11.54.6]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id CD9DE3C0D197; Wed, 21 Sep 2022 23:14:12 +0000 (UTC) Received: from gshan.redhat.com (vpn2-54-126.bne.redhat.com [10.64.54.126]) by smtp.corp.redhat.com (Postfix) with ESMTP id 392982166B26; Wed, 21 Sep 2022 23:14:08 +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 v3 4/5] hw/arm/virt: Improve high memory region address assignment Date: Thu, 22 Sep 2022 07:13:48 +0800 Message-Id: <20220921231349.274049-5-gshan@redhat.com> In-Reply-To: <20220921231349.274049-1-gshan@redhat.com> References: <20220921231349.274049-1-gshan@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.1 on 10.11.54.6 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: -27 X-Spam_score: -2.8 X-Spam_bar: -- X-Spam_report: (-2.8 / 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_LOW=-0.7, 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. This improves the address assignment for those three high memory region by skipping the address assignment for one specific high memory region if it has been disabled in case (1), (2) and (3). Signed-off-by: Gavin Shan --- hw/arm/virt.c | 44 ++++++++++++++++++++++++++------------------ 1 file changed, 26 insertions(+), 18 deletions(-) diff --git a/hw/arm/virt.c b/hw/arm/virt.c index b0b679d1f4..b702f8f2b5 100644 --- a/hw/arm/virt.c +++ b/hw/arm/virt.c @@ -1693,15 +1693,31 @@ static void virt_set_high_memmap(VirtMachineState *vms, hwaddr base, int pa_bits) { hwaddr region_base, region_size; - bool fits; + bool *region_enabled, fits; int i; for (i = VIRT_LOWMEMMAP_LAST; i < ARRAY_SIZE(extended_memmap); i++) { region_base = ROUND_UP(base, extended_memmap[i].size); region_size = extended_memmap[i].size; - vms->memmap[i].base = region_base; - vms->memmap[i].size = region_size; + switch (i) { + case VIRT_HIGH_GIC_REDIST2: + region_enabled = &vms->highmem_redists; + break; + case VIRT_HIGH_PCIE_ECAM: + region_enabled = &vms->highmem_ecam; + break; + case VIRT_HIGH_PCIE_MMIO: + region_enabled = &vms->highmem_mmio; + break; + default: + region_enabled = NULL; + } + + /* Skip unknown region */ + if (!region_enabled) { + continue; + } /* * Check each device to see if they fit in the PA space, @@ -1710,23 +1726,15 @@ static void virt_set_high_memmap(VirtMachineState *vms, * For each device that doesn't fit, disable it. */ fits = (region_base + region_size) <= BIT_ULL(pa_bits); - if (fits) { - vms->highest_gpa = region_base + region_size - 1; - } + if (*region_enabled && fits) { + vms->memmap[i].base = region_base; + vms->memmap[i].size = region_size; - switch (i) { - case VIRT_HIGH_GIC_REDIST2: - vms->highmem_redists &= fits; - break; - case VIRT_HIGH_PCIE_ECAM: - vms->highmem_ecam &= fits; - break; - case VIRT_HIGH_PCIE_MMIO: - vms->highmem_mmio &= fits; - break; + vms->highest_gpa = region_base + region_size - 1; + base = region_base + region_size; + } else { + *region_enabled = false; } - - base = region_base + region_size; } }