From patchwork Tue Aug 11 15:30:05 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg Kurz X-Patchwork-Id: 11709355 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id BE443739 for ; Tue, 11 Aug 2020 15:32:10 +0000 (UTC) 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 mail.kernel.org (Postfix) with ESMTPS id 4280F20771 for ; Tue, 11 Aug 2020 15:32:09 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 4280F20771 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=kaod.org Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Received: from localhost ([::1]:54648 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1k5WG0-0000ao-Qt for patchwork-qemu-devel@patchwork.kernel.org; Tue, 11 Aug 2020 11:32:08 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:56248) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1k5WEF-0007eT-3e for qemu-devel@nongnu.org; Tue, 11 Aug 2020 11:30:19 -0400 Received: from us-smtp-1.mimecast.com ([205.139.110.61]:50405 helo=us-smtp-delivery-1.mimecast.com) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_CBC_SHA1:256) (Exim 4.90_1) (envelope-from ) id 1k5WEC-0002Jl-2d for qemu-devel@nongnu.org; Tue, 11 Aug 2020 11:30:18 -0400 Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-556-sU1a593qO6Cp_1SBqCErKg-1; Tue, 11 Aug 2020 11:30:10 -0400 X-MC-Unique: sU1a593qO6Cp_1SBqCErKg-1 Received: from smtp.corp.redhat.com (int-mx06.intmail.prod.int.phx2.redhat.com [10.5.11.16]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id E681319067E3; Tue, 11 Aug 2020 15:30:07 +0000 (UTC) Received: from bahia.lan (ovpn-112-38.ams2.redhat.com [10.36.112.38]) by smtp.corp.redhat.com (Postfix) with ESMTP id 4B9A069318; Tue, 11 Aug 2020 15:30:06 +0000 (UTC) Subject: [PATCH 1/2] nvram: Add dry_run argument to chrp_nvram_create_system_partition() From: Greg Kurz To: Thomas Huth Date: Tue, 11 Aug 2020 17:30:05 +0200 Message-ID: <159715980541.1635409.14788051616570436860.stgit@bahia.lan> In-Reply-To: <159715979684.1635409.14107632395902701971.stgit@bahia.lan> References: <159715979684.1635409.14107632395902701971.stgit@bahia.lan> User-Agent: StGit/0.21 MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.16 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: kaod.org Received-SPF: softfail client-ip=205.139.110.61; envelope-from=groug@kaod.org; helo=us-smtp-delivery-1.mimecast.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/08/11 06:40:20 X-ACL-Warn: Detected OS = Linux 2.2.x-3.x [generic] [fuzzy] 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, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H2=-1, SPF_HELO_NONE=0.001, SPF_SOFTFAIL=0.665 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: qemu-devel@nongnu.org, qemu-ppc@nongnu.org, Mark Cave-Ayland , Laurent Vivier , David Gibson Errors-To: qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Sender: "Qemu-devel" Since commit 55d9950aaa8e ("nvram: Introduce helper functions for CHRP "system" and "free space" partitions") it is possible to pre-initialize a "system" partition in the NVRAM with the data passed to all -prom-env parameters on the QEMU command line. Unfortunately, this doesn't take the total size of the data into account and chrp_nvram_create_system_partition() may crash at some point if the caller hasn't allocated enough space. Add a dry_run argument that causes chrp_nvram_create_system_partition() to only return the size of the partition without actually copying data into it. This can be used by callers to allocate enough memory. Signed-off-by: Greg Kurz --- hw/nvram/chrp_nvram.c | 35 +++++++++++++++++++++++------------ hw/nvram/mac_nvram.c | 2 +- hw/nvram/spapr_nvram.c | 3 ++- hw/sparc/sun4m.c | 2 +- hw/sparc64/sun4u.c | 2 +- include/hw/nvram/chrp_nvram.h | 3 ++- 6 files changed, 30 insertions(+), 17 deletions(-) diff --git a/hw/nvram/chrp_nvram.c b/hw/nvram/chrp_nvram.c index d969f267048e..548cb8b5c97a 100644 --- a/hw/nvram/chrp_nvram.c +++ b/hw/nvram/chrp_nvram.c @@ -24,37 +24,47 @@ #include "hw/nvram/chrp_nvram.h" #include "sysemu/sysemu.h" -static int chrp_nvram_set_var(uint8_t *nvram, int addr, const char *str) +static int chrp_nvram_set_var(uint8_t *nvram, int addr, const char *str, + bool dry_run) { int len; len = strlen(str) + 1; - memcpy(&nvram[addr], str, len); - + if (!dry_run) { + memcpy(&nvram[addr], str, len); + } return addr + len; } /** * Create a "system partition", used for the Open Firmware - * environment variables. + * environment variables. If @dry_run is false, only returns + * the size of the partition but don't write the data. */ -int chrp_nvram_create_system_partition(uint8_t *data, int min_len) +int chrp_nvram_create_system_partition(uint8_t *data, int min_len, bool dry_run) { ChrpNvramPartHdr *part_header; unsigned int i; int end; - part_header = (ChrpNvramPartHdr *)data; - part_header->signature = CHRP_NVPART_SYSTEM; - pstrcpy(part_header->name, sizeof(part_header->name), "system"); + assert(data || dry_run); + + if (!dry_run) { + part_header = (ChrpNvramPartHdr *)data; + part_header->signature = CHRP_NVPART_SYSTEM; + pstrcpy(part_header->name, sizeof(part_header->name), "system"); + } end = sizeof(ChrpNvramPartHdr); for (i = 0; i < nb_prom_envs; i++) { - end = chrp_nvram_set_var(data, end, prom_envs[i]); + end = chrp_nvram_set_var(data, end, prom_envs[i], dry_run); } /* End marker */ - data[end++] = '\0'; + if (!dry_run) { + data[end] = '\0'; + } + end++; end = (end + 15) & ~15; /* XXX: OpenBIOS is not able to grow up a partition. Leave some space for @@ -62,8 +72,9 @@ int chrp_nvram_create_system_partition(uint8_t *data, int min_len) if (end < min_len) { end = min_len; } - chrp_nvram_finish_partition(part_header, end); - + if (!dry_run) { + chrp_nvram_finish_partition(part_header, end); + } return end; } diff --git a/hw/nvram/mac_nvram.c b/hw/nvram/mac_nvram.c index beec1c4e4d11..4396f893f14a 100644 --- a/hw/nvram/mac_nvram.c +++ b/hw/nvram/mac_nvram.c @@ -141,7 +141,7 @@ static void pmac_format_nvram_partition_of(MacIONVRAMState *nvr, int off, /* OpenBIOS nvram variables partition */ sysp_end = chrp_nvram_create_system_partition(&nvr->data[off], - DEF_SYSTEM_SIZE) + off; + DEF_SYSTEM_SIZE, false) + off; /* Free space partition */ chrp_nvram_create_free_partition(&nvr->data[sysp_end], len - sysp_end); diff --git a/hw/nvram/spapr_nvram.c b/hw/nvram/spapr_nvram.c index 15d08281d411..992b818d34e7 100644 --- a/hw/nvram/spapr_nvram.c +++ b/hw/nvram/spapr_nvram.c @@ -188,7 +188,8 @@ static void spapr_nvram_realize(SpaprVioDevice *dev, Error **errp) } } else if (nb_prom_envs > 0) { /* Create a system partition to pass the -prom-env variables */ - chrp_nvram_create_system_partition(nvram->buf, MIN_NVRAM_SIZE / 4); + chrp_nvram_create_system_partition(nvram->buf, MIN_NVRAM_SIZE / 4, + false); chrp_nvram_create_free_partition(&nvram->buf[MIN_NVRAM_SIZE / 4], nvram->size - MIN_NVRAM_SIZE / 4); } diff --git a/hw/sparc/sun4m.c b/hw/sparc/sun4m.c index 9be930415f8e..61804ccd4286 100644 --- a/hw/sparc/sun4m.c +++ b/hw/sparc/sun4m.c @@ -143,7 +143,7 @@ static void nvram_init(Nvram *nvram, uint8_t *macaddr, memset(image, '\0', sizeof(image)); /* OpenBIOS nvram variables partition */ - sysp_end = chrp_nvram_create_system_partition(image, 0); + sysp_end = chrp_nvram_create_system_partition(image, 0, false); /* Free space partition */ chrp_nvram_create_free_partition(&image[sysp_end], 0x1fd0 - sysp_end); diff --git a/hw/sparc64/sun4u.c b/hw/sparc64/sun4u.c index 9e30203dcc44..2409e739e81b 100644 --- a/hw/sparc64/sun4u.c +++ b/hw/sparc64/sun4u.c @@ -136,7 +136,7 @@ static int sun4u_NVRAM_set_params(Nvram *nvram, uint16_t NVRAM_size, memset(image, '\0', sizeof(image)); /* OpenBIOS nvram variables partition */ - sysp_end = chrp_nvram_create_system_partition(image, 0); + sysp_end = chrp_nvram_create_system_partition(image, 0, false); /* Free space partition */ chrp_nvram_create_free_partition(&image[sysp_end], 0x1fd0 - sysp_end); diff --git a/include/hw/nvram/chrp_nvram.h b/include/hw/nvram/chrp_nvram.h index 09941a9be454..1d32dbf61331 100644 --- a/include/hw/nvram/chrp_nvram.h +++ b/include/hw/nvram/chrp_nvram.h @@ -50,7 +50,8 @@ chrp_nvram_finish_partition(ChrpNvramPartHdr *header, uint32_t size) header->checksum = sum & 0xff; } -int chrp_nvram_create_system_partition(uint8_t *data, int min_len); +int chrp_nvram_create_system_partition(uint8_t *data, int min_len, + bool dry_run); int chrp_nvram_create_free_partition(uint8_t *data, int len); #endif