From patchwork Thu Jul 21 10:09:59 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: "Jason A. Donenfeld" X-Patchwork-Id: 12924949 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 4BEA4C433EF for ; Thu, 21 Jul 2022 10:12:00 +0000 (UTC) Received: from localhost ([::1]:56644 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1oET9z-0006Ao-0Q for qemu-devel@archiver.kernel.org; Thu, 21 Jul 2022 06:11:59 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:37250) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1oET8K-0005OD-RK for qemu-devel@nongnu.org; Thu, 21 Jul 2022 06:10:16 -0400 Received: from dfw.source.kernel.org ([2604:1380:4641:c500::1]:42062) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1oET8I-0005jQ-8o for qemu-devel@nongnu.org; Thu, 21 Jul 2022 06:10:16 -0400 Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id A25EA60DF9; Thu, 21 Jul 2022 10:10:12 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 18CD5C3411E; Thu, 21 Jul 2022 10:10:10 +0000 (UTC) Authentication-Results: smtp.kernel.org; dkim=pass (1024-bit key) header.d=zx2c4.com header.i=@zx2c4.com header.b="XUdWm/nd" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=zx2c4.com; s=20210105; t=1658398208; 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=aW0HzKWwFjLe7hXadraI9IO7V6F6cb+2UQJdJyX7FXw=; b=XUdWm/ndsdXnWmWdQa0RmBu4Yk+tVKauELqLZj1iw0YBeUR1O/D1Rs8MpvL9kzCQVejdwI cxgv+SdcOsYrTWRZAhyIJCJZ8JW4TUqkM0LBc7k98iHalunOy9xHHwUEZr2fGK9L/+hgI3 cCituQcLyABwdkM3SwadJA341QL7I6U= Received: by mail.zx2c4.com (ZX2C4 Mail Server) with ESMTPSA id de7d4e4a (TLSv1.3:AEAD-AES256-GCM-SHA384:256:NO); Thu, 21 Jul 2022 10:10:08 +0000 (UTC) From: "Jason A. Donenfeld" To: pbonzini@redhat.com, qemu-devel@nongnu.org Cc: "Jason A. Donenfeld" , "Michael S . Tsirkin" , Marcel Apfelbaum , Richard Henderson , Eduardo Habkost , Peter Maydell , =?utf-8?q?Philippe_Mathieu-Daud?= =?utf-8?q?=C3=A9?= , Laurent Vivier Subject: [PATCH v4] hw/i386: pass RNG seed via setup_data entry Date: Thu, 21 Jul 2022 12:09:59 +0200 Message-Id: <20220721100959.427518-1-Jason@zx2c4.com> In-Reply-To: References: MIME-Version: 1.0 Received-SPF: pass client-ip=2604:1380:4641:c500::1; envelope-from=SRS0=2GtW=X2=zx2c4.com=Jason@kernel.org; helo=dfw.source.kernel.org X-Spam_score_int: -67 X-Spam_score: -6.8 X-Spam_bar: ------ X-Spam_report: (-6.8 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, HEADER_FROM_DIFFERENT_DOMAINS=0.249, RCVD_IN_DNSWL_HI=-5, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 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" Tiny machines optimized for fast boot time generally don't use EFI, which means a random seed has to be supplied some other way. For this purpose, Linux (≥5.20) supports passing a seed in the setup_data table with SETUP_RNG_SEED, specially intended for hypervisors, kexec, and specialized bootloaders. The linked commit shows the upstream kernel implementation. Link: https://git.kernel.org/tip/tip/c/68b8e9713c8 Cc: Michael S. Tsirkin Cc: Marcel Apfelbaum Cc: Paolo Bonzini Cc: Richard Henderson Cc: Eduardo Habkost Cc: Peter Maydell Cc: Philippe Mathieu-Daudé Cc: Laurent Vivier Signed-off-by: Jason A. Donenfeld --- hw/i386/x86.c | 21 +++++++++++++++++--- include/standard-headers/asm-x86/bootparam.h | 1 + 2 files changed, 19 insertions(+), 3 deletions(-) diff --git a/hw/i386/x86.c b/hw/i386/x86.c index 6003b4b2df..284c97f158 100644 --- a/hw/i386/x86.c +++ b/hw/i386/x86.c @@ -26,6 +26,7 @@ #include "qemu/cutils.h" #include "qemu/units.h" #include "qemu/datadir.h" +#include "qemu/guest-random.h" #include "qapi/error.h" #include "qapi/qmp/qerror.h" #include "qapi/qapi-visit-common.h" @@ -771,7 +772,7 @@ void x86_load_linux(X86MachineState *x86ms, bool linuxboot_dma_enabled = X86_MACHINE_GET_CLASS(x86ms)->fwcfg_dma_enabled; uint16_t protocol; int setup_size, kernel_size, cmdline_size; - int dtb_size, setup_data_offset; + int dtb_size, setup_data_offset, last_setup_data_offset = 0; uint32_t initrd_max; uint8_t header[8192], *setup, *kernel; hwaddr real_addr, prot_addr, cmdline_addr, initrd_addr = 0; @@ -1063,16 +1064,30 @@ void x86_load_linux(X86MachineState *x86ms, kernel_size = setup_data_offset + sizeof(struct setup_data) + dtb_size; kernel = g_realloc(kernel, kernel_size); - stq_p(header + 0x250, prot_addr + setup_data_offset); setup_data = (struct setup_data *)(kernel + setup_data_offset); - setup_data->next = 0; + setup_data->next = last_setup_data_offset; setup_data->type = cpu_to_le32(SETUP_DTB); setup_data->len = cpu_to_le32(dtb_size); load_image_size(dtb_filename, setup_data->data, dtb_size); + + last_setup_data_offset = prot_addr + setup_data_offset; } + setup_data_offset = QEMU_ALIGN_UP(kernel_size, 16); + kernel_size = setup_data_offset + sizeof(struct setup_data) + 32; + kernel = g_realloc(kernel, kernel_size); + setup_data = (struct setup_data *)(kernel + setup_data_offset); + setup_data->next = last_setup_data_offset; + setup_data->type = cpu_to_le32(SETUP_RNG_SEED); + setup_data->len = cpu_to_le32(32); + qemu_guest_getrandom_nofail(setup_data->data, 32); + + last_setup_data_offset = prot_addr + setup_data_offset; + + stq_p(header + 0x250, last_setup_data_offset); + /* * If we're starting an encrypted VM, it will be OVMF based, which uses the * efi stub for booting and doesn't require any values to be placed in the diff --git a/include/standard-headers/asm-x86/bootparam.h b/include/standard-headers/asm-x86/bootparam.h index 072e2ed546..b2aaad10e5 100644 --- a/include/standard-headers/asm-x86/bootparam.h +++ b/include/standard-headers/asm-x86/bootparam.h @@ -10,6 +10,7 @@ #define SETUP_EFI 4 #define SETUP_APPLE_PROPERTIES 5 #define SETUP_JAILHOUSE 6 +#define SETUP_RNG_SEED 9 #define SETUP_INDIRECT (1<<31)