From patchwork Fri Jun 21 23:56:05 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Stefano Stabellini X-Patchwork-Id: 11010819 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id DABA46C5 for ; Fri, 21 Jun 2019 23:57:01 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id CB75E2870D for ; Fri, 21 Jun 2019 23:57:01 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id BFBEC28BAD; Fri, 21 Jun 2019 23:57:01 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-5.0 required=2.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,MAILING_LIST_MULTI,RCVD_IN_DNSWL_MED autolearn=ham version=3.3.1 Received: from lists.xenproject.org (lists.xenproject.org [192.237.175.120]) (using TLSv1.2 with cipher AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id 4FE702870D for ; Fri, 21 Jun 2019 23:57:01 +0000 (UTC) Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.89) (envelope-from ) id 1heTO9-0004W4-Gz; Fri, 21 Jun 2019 23:56:13 +0000 Received: from us1-rack-dfw2.inumbo.com ([104.130.134.6]) by lists.xenproject.org with esmtp (Exim 4.89) (envelope-from ) id 1heTO8-0004V5-A9 for xen-devel@lists.xenproject.org; Fri, 21 Jun 2019 23:56:12 +0000 X-Inumbo-ID: 24f0bd46-9480-11e9-8980-bc764e045a96 Received: from mail.kernel.org (unknown [198.145.29.99]) by us1-rack-dfw2.inumbo.com (Halon) with ESMTPS id 24f0bd46-9480-11e9-8980-bc764e045a96; Fri, 21 Jun 2019 23:56:11 +0000 (UTC) Received: from sstabellini-ThinkPad-T480s.xilinx.com (c-67-164-102-47.hsd1.ca.comcast.net [67.164.102.47]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 627E6208CA; Fri, 21 Jun 2019 23:56:10 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1561161370; bh=ooUl19J+IJwZ1PqFUpcffEM0Og0dNRoOvPVOxh2NX3A=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=KYB9qNK6rDDwk6nE4MZoNevD99KLnTJytUfgd9JPYy5DK6Nz5jeBgbXBszCwrlF+A 1Y1DP9E7OItZjNzm0ynWBfjQ8EZVIqMOEaJLj533LcZPGW+se4G26WVsCidM5tCwz0 Usjf1J15+A6nwgjz7udwCtYDafiSM+alpLGyEbRQ= From: Stefano Stabellini To: xen-devel@lists.xenproject.org Date: Fri, 21 Jun 2019 16:56:05 -0700 Message-Id: <20190621235608.2153-3-sstabellini@kernel.org> X-Mailer: git-send-email 2.17.1 In-Reply-To: References: Subject: [Xen-devel] [PATCH v3 3/6] xen/arm: keep track of reserved-memory regions X-BeenThere: xen-devel@lists.xenproject.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Xen developer discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Cc: Stefano Stabellini , julien.grall@arm.com, sstabellini@kernel.org MIME-Version: 1.0 Errors-To: xen-devel-bounces@lists.xenproject.org Sender: "Xen-devel" X-Virus-Scanned: ClamAV using ClamSMTP As we parse the device tree in Xen, keep track of the reserved-memory regions as they need special treatment (follow-up patches will make use of the stored information.) Reuse process_memory_node to add reserved-memory regions to the bootinfo.reserved_mem array. Refuse to continue once we reach the max number of reserved memory regions to avoid accidentally mapping any portions of them into a VM. Signed-off-by: Stefano Stabellini --- It is cleaner to avoid sharing the whole function process_memory_node between the normal memory case and the reserved-memory case. I'll do it in the next version once I understand the best way do to it. --- Changes in v3: - match only /reserved-memory - put the warning back in place for reg not present on a normal memory region - refuse to continue once we reach the max number of reserved memory regions Changes in v2: - call process_memory_node from process_reserved_memory_node to avoid duplication --- xen/arch/arm/bootfdt.c | 38 +++++++++++++++++++++++++++++++------ xen/include/asm-arm/setup.h | 1 + 2 files changed, 33 insertions(+), 6 deletions(-) diff --git a/xen/arch/arm/bootfdt.c b/xen/arch/arm/bootfdt.c index 611724433b..b24ab10cb9 100644 --- a/xen/arch/arm/bootfdt.c +++ b/xen/arch/arm/bootfdt.c @@ -135,6 +135,8 @@ static int __init process_memory_node(const void *fdt, int node, const __be32 *cell; paddr_t start, size; u32 reg_cells = address_cells + size_cells; + struct meminfo *mem; + bool reserved = (bool)data; if ( address_cells < 1 || size_cells < 1 ) { @@ -143,29 +145,49 @@ static int __init process_memory_node(const void *fdt, int node, return 0; } + if ( reserved ) + mem = &bootinfo.reserved_mem; + else + mem = &bootinfo.mem; + prop = fdt_get_property(fdt, node, "reg", NULL); if ( !prop ) { - printk("fdt: node `%s': missing `reg' property\n", name); + if ( !reserved ) + printk("fdt: node `%s': missing `reg' property\n", name); return 0; } cell = (const __be32 *)prop->data; banks = fdt32_to_cpu(prop->len) / (reg_cells * sizeof (u32)); - for ( i = 0; i < banks && bootinfo.mem.nr_banks < NR_MEM_BANKS; i++ ) + for ( i = 0; i < banks && mem->nr_banks < NR_MEM_BANKS; i++ ) { device_tree_get_reg(&cell, address_cells, size_cells, &start, &size); if ( !size ) continue; - bootinfo.mem.bank[bootinfo.mem.nr_banks].start = start; - bootinfo.mem.bank[bootinfo.mem.nr_banks].size = size; - bootinfo.mem.nr_banks++; + mem->bank[mem->nr_banks].start = start; + mem->bank[mem->nr_banks].size = size; + mem->nr_banks++; } + /* + * We reached the max number of supported reserved-memory regions. + * Stop and refuse to continue. We don't want to risk Xen allocating + * those regions as normal memory to a VM. + */ + BUG_ON(reserved && mem->nr_banks == NR_MEM_BANKS); return 0; } +static int __init process_reserved_memory_node(const void *fdt, int node, + const char *name, int depth, + u32 address_cells, u32 size_cells) +{ + device_tree_for_each_node(fdt, node, depth, process_memory_node, (void*)true); + return 0; +} + static void __init process_multiboot_node(const void *fdt, int node, const char *name, u32 address_cells, u32 size_cells) @@ -299,7 +321,11 @@ static int __init early_scan_node(const void *fdt, if ( device_tree_node_matches(fdt, node, "memory") ) rc = process_memory_node(fdt, node, name, depth, - address_cells, size_cells, NULL); + address_cells, size_cells, (void*)false); + else if ( depth == 1 && !strcmp(name, "reserved-memory") && + strlen(name) == strlen("reserved-memory") ) + rc = process_reserved_memory_node(fdt, node, name, depth, + address_cells, size_cells); else if ( depth <= 3 && (device_tree_node_compatible(fdt, node, "xen,multiboot-module" ) || device_tree_node_compatible(fdt, node, "multiboot,module" ))) process_multiboot_node(fdt, node, name, address_cells, size_cells); diff --git a/xen/include/asm-arm/setup.h b/xen/include/asm-arm/setup.h index 8bf3d5910a..efcba545c2 100644 --- a/xen/include/asm-arm/setup.h +++ b/xen/include/asm-arm/setup.h @@ -66,6 +66,7 @@ struct bootcmdlines { struct bootinfo { struct meminfo mem; + struct meminfo reserved_mem; struct bootmodules modules; struct bootcmdlines cmdlines; #ifdef CONFIG_ACPI