From mboxrd@z Thu Jan 1 00:00:00 1970 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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id B1DCBC433EF for ; Sat, 25 Jun 2022 15:44:17 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232883AbiFYPoR (ORCPT ); Sat, 25 Jun 2022 11:44:17 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:58500 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232850AbiFYPoQ (ORCPT ); Sat, 25 Jun 2022 11:44:16 -0400 Received: from ams.source.kernel.org (ams.source.kernel.org [IPv6:2604:1380:4601:e00::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id E9F9612A96 for ; Sat, 25 Jun 2022 08:44:15 -0700 (PDT) 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 ams.source.kernel.org (Postfix) with ESMTPS id A25EBB8095A; Sat, 25 Jun 2022 15:44:14 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 943A9C3411C; Sat, 25 Jun 2022 15:44:12 +0000 (UTC) Authentication-Results: smtp.kernel.org; dkim=pass (1024-bit key) header.d=zx2c4.com header.i=@zx2c4.com header.b="cIUADsCK" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=zx2c4.com; s=20210105; t=1656171851; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding; bh=8R4CaV/OEt3lr+fj/h7Drz8mOofV0RCqbg5qshPp2Kw=; b=cIUADsCKvtljLtAMAU3Idmd0fKP7YlHD6l64J+mHFf4qnNr/AX6wsdeI/5ZqAeETRmJ8U1 /djJkcfGR7lqgkkhyNMFp6diFQOoaqmG/duGIFx+044RvYETP4GKK3zTFrwre9Aa4LxmV/ FHCLy7SRM6TGhSLO51Vo/spOz0VNHYE= Received: by mail.zx2c4.com (ZX2C4 Mail Server) with ESMTPSA id ae9c7f36 (TLSv1.3:AEAD-AES256-GCM-SHA384:256:NO); Sat, 25 Jun 2022 15:44:10 +0000 (UTC) From: "Jason A. Donenfeld" To: Laurent Vivier , Mark Cave-Ayland , geert@linux-m68k.org, linux-m68k@lists.linux-m68k.org, qemu-devel@nongnu.org Cc: "Jason A. Donenfeld" Subject: [PATCH qemu] m68k: virt: pass RNG seed via bootinfo block Date: Sat, 25 Jun 2022 17:44:02 +0200 Message-Id: <20220625154402.146403-1-Jason@zx2c4.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-m68k@vger.kernel.org This commit wires up bootinfo's RNG seed attribute so that Linux VMs can have their RNG seeded from the earliest possible time in boot, just like the "rng-seed" device tree property on those platforms. The link contains the corresponding Linux patch. Link: https://lore.kernel.org/lkml/20220625153841.143928-1-Jason@zx2c4.com/ Signed-off-by: Jason A. Donenfeld --- This requires this trivial cleanup commit first: https://lore.kernel.org/qemu-devel/20220625152318.120849-1-Jason@zx2c4.com/ hw/m68k/bootinfo.h | 16 ++++++++++++++++ hw/m68k/virt.c | 7 +++++++ .../standard-headers/asm-m68k/bootinfo-virt.h | 1 + 3 files changed, 24 insertions(+) diff --git a/hw/m68k/bootinfo.h b/hw/m68k/bootinfo.h index ff4e155a3c..2f31c13b6e 100644 --- a/hw/m68k/bootinfo.h +++ b/hw/m68k/bootinfo.h @@ -56,4 +56,20 @@ stb_phys(as, base++, 0); \ base = (base + 1) & ~1; \ } while (0) + +#define BOOTINFODATA(as, base, id, data, len) \ + do { \ + int i; \ + stw_phys(as, base, id); \ + base += 2; \ + stw_phys(as, base, \ + (sizeof(struct bi_record) + len + 5) & ~1); \ + base += 2; \ + stl_phys(as, base, len); \ + base += 4; \ + for (i = 0; i < len; ++i) { \ + stb_phys(as, base++, data[i]); \ + } \ + base = (base + 1) & ~1; \ + } while (0) #endif diff --git a/hw/m68k/virt.c b/hw/m68k/virt.c index e215aa3d42..0aa383fa6b 100644 --- a/hw/m68k/virt.c +++ b/hw/m68k/virt.c @@ -9,6 +9,7 @@ #include "qemu/osdep.h" #include "qemu/units.h" +#include "qemu/guest-random.h" #include "sysemu/sysemu.h" #include "cpu.h" #include "hw/boards.h" @@ -120,6 +121,7 @@ static void virt_init(MachineState *machine) hwaddr io_base; int i; ResetInfo *reset_info; + uint8_t rng_seed[32]; if (ram_size > 3399672 * KiB) { /* @@ -245,6 +247,11 @@ static void virt_init(MachineState *machine) kernel_cmdline); } + /* Pass seed to RNG. */ + qemu_guest_getrandom_nofail(rng_seed, sizeof(rng_seed)); + BOOTINFODATA(cs->as, parameters_base, BI_VIRT_RNG_SEED, + rng_seed, sizeof(rng_seed)); + /* load initrd */ if (initrd_filename) { initrd_size = get_image_size(initrd_filename); diff --git a/include/standard-headers/asm-m68k/bootinfo-virt.h b/include/standard-headers/asm-m68k/bootinfo-virt.h index 81be1e0924..1b1ffd4705 100644 --- a/include/standard-headers/asm-m68k/bootinfo-virt.h +++ b/include/standard-headers/asm-m68k/bootinfo-virt.h @@ -12,6 +12,7 @@ #define BI_VIRT_GF_TTY_BASE 0x8003 #define BI_VIRT_VIRTIO_BASE 0x8004 #define BI_VIRT_CTRL_BASE 0x8005 +#define BI_VIRT_RNG_SEED 0x8006 #define VIRT_BOOTI_VERSION MK_BI_VERSION(2, 0) -- 2.35.1