From nobody Thu May 7 06:22:27 2026 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=pass(p=quarantine dis=none) header.from=zx2c4.com ARC-Seal: i=1; a=rsa-sha256; t=1657644514; cv=none; d=zohomail.com; s=zohoarc; b=DrPU7ZdRWCr7nXsQr3nOAzju+Ks6RJRCcWvTd4yIRH3e2P4T7RfY6cOqeQvofTfhHoM2VbN/EGYdxut1Eni6t9YUo5cLA46VmqAKwLxwpGk3719TCqakW4c9RRWMQMa30CzBDf0uHj5rsepHqxrcjnyBsvaq/Msz0zB56SKKygs= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1657644514; h=Content-Transfer-Encoding:Cc:Date:From:List-Subscribe:List-Post:List-Id:List-Archive:List-Help:List-Unsubscribe:MIME-Version:Message-ID:Sender:Subject:To; bh=iwsHLV9WNMrfaQc3DA7BC1+OCflXBbVPcxlPcTWXjMs=; b=YliKyzqIpBS2HIFmiMBMWEl/UhHVpG1JIntfJtITRUnp2dcUo3W+EfNIl2FJF7UqCVxPdnJJCVjups4Bk5/D7fwc3txtaeuQruyfXSpzixT6jgQDUMCF36q9V9pcB1w3L06UA1anoQwOYQR4c0wod4Lr9tceRh33lFUF3ZrNJqc= ARC-Authentication-Results: i=1; mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=pass header.from= (p=quarantine dis=none) Return-Path: Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) by mx.zohomail.com with SMTPS id 1657644514052213.43655430535068; Tue, 12 Jul 2022 09:48:34 -0700 (PDT) Received: from localhost ([::1]:48852 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1oBJ3o-0000T2-6g for importer@patchew.org; Tue, 12 Jul 2022 12:48:32 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:33762) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1oBJ28-0007D6-RS for qemu-devel@nongnu.org; Tue, 12 Jul 2022 12:46:49 -0400 Received: from ams.source.kernel.org ([145.40.68.75]:35312) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1oBJ26-0001eC-39 for qemu-devel@nongnu.org; Tue, 12 Jul 2022 12:46:48 -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 ams.source.kernel.org (Postfix) with ESMTPS id 8FD39B81A90; Tue, 12 Jul 2022 16:46:43 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 63524C3411C; Tue, 12 Jul 2022 16:46:41 +0000 (UTC) Received: by mail.zx2c4.com (ZX2C4 Mail Server) with ESMTPSA id f8d2426e (TLSv1.3:AEAD-AES256-GCM-SHA384:256:NO); Tue, 12 Jul 2022 16:46:38 +0000 (UTC) Authentication-Results: smtp.kernel.org; dkim=pass (1024-bit key) header.d=zx2c4.com header.i=@zx2c4.com header.b="CKf/23T9" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=zx2c4.com; s=20210105; t=1657644399; 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=iwsHLV9WNMrfaQc3DA7BC1+OCflXBbVPcxlPcTWXjMs=; b=CKf/23T9TE4KuI2cjN80lhm0FVRW/tY1qqZ3fpAQmTnNMybNqcDxl6SkaPEv1pxlRKIP5W X0b4DBqXhyxrp/vjLqCZG3/OIyTEisnRZO/P4JMsqB339UvwSfzDiQ+HT7SMPV4ZRgHyZK Ob7JHyjS1AG8bGyz6WWUW1dy1b0DVzQ= From: "Jason A. Donenfeld" To: linux-s390@vger.kernel.org, qemu-devel@nongnu.org Cc: "Jason A. Donenfeld" , Thomas Huth , Richard Henderson , Harald Freudenberger , Holger Dengler Subject: [PATCH qemu] target/s390x: support PRNO_TRNG instruction Date: Tue, 12 Jul 2022 18:46:27 +0200 Message-Id: <20220712164627.581570-1-Jason@zx2c4.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=145.40.68.75; envelope-from=SRS0=V6zu=XR=zx2c4.com=Jason@kernel.org; helo=ams.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+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: pass (identity @zx2c4.com) X-ZM-MESSAGEID: 1657644514967100001 Content-Type: text/plain; charset="utf-8" In order for hosts running inside of TCG to initialize the kernel's random number generator, we should support the PRNO_TRNG instruction, backed in the usual way with the qemu_guest_getrandom helper. This is confirmed working on Linux 5.19-rc6. Cc: Thomas Huth Cc: Richard Henderson Cc: Harald Freudenberger Cc: Holger Dengler Signed-off-by: Jason A. Donenfeld --- target/s390x/gen-features.c | 2 ++ target/s390x/tcg/crypto_helper.c | 23 +++++++++++++++++++++++ 2 files changed, 25 insertions(+) diff --git a/target/s390x/gen-features.c b/target/s390x/gen-features.c index ad140184b9..3d333e2789 100644 --- a/target/s390x/gen-features.c +++ b/target/s390x/gen-features.c @@ -749,6 +749,8 @@ static uint16_t qemu_V7_0[] =3D { */ static uint16_t qemu_MAX[] =3D { S390_FEAT_VECTOR_ENH2, + S390_FEAT_MSA_EXT_5, + S390_FEAT_PRNO_TRNG, }; =20 /****** END FEATURE DEFS ******/ diff --git a/target/s390x/tcg/crypto_helper.c b/target/s390x/tcg/crypto_hel= per.c index 138d9e7ad9..cefdfd114e 100644 --- a/target/s390x/tcg/crypto_helper.c +++ b/target/s390x/tcg/crypto_helper.c @@ -12,12 +12,28 @@ =20 #include "qemu/osdep.h" #include "qemu/main-loop.h" +#include "qemu/guest-random.h" #include "s390x-internal.h" #include "tcg_s390x.h" #include "exec/helper-proto.h" #include "exec/exec-all.h" #include "exec/cpu_ldst.h" =20 +static void fill_buf_random(CPUS390XState *env, uintptr_t ra, + uint64_t buf, uint64_t len) +{ + uint64_t addr =3D wrap_address(env, buf); + uint8_t tmp[256]; + + while (len) { + size_t block =3D MIN(len, sizeof(tmp)); + qemu_guest_getrandom_nofail(tmp, block); + for (size_t i =3D 0; i < block; ++i) + cpu_stb_data_ra(env, addr++, tmp[i], ra); + len -=3D block; + } +} + uint32_t HELPER(msa)(CPUS390XState *env, uint32_t r1, uint32_t r2, uint32_= t r3, uint32_t type) { @@ -52,6 +68,13 @@ uint32_t HELPER(msa)(CPUS390XState *env, uint32_t r1, ui= nt32_t r2, uint32_t r3, cpu_stb_data_ra(env, param_addr, subfunc[i], ra); } break; + case 114: { + const uint64_t ucbuf =3D env->regs[r1], ucbuf_len =3D env->regs[r1= + 1]; + const uint64_t cbuf =3D env->regs[r2], cbuf_len =3D env->regs[r2 += 1]; + fill_buf_random(env, ra, ucbuf, ucbuf_len); + fill_buf_random(env, ra, cbuf, cbuf_len); + break; + } default: /* we don't implement any other subfunction yet */ g_assert_not_reached(); --=20 2.35.1