From nobody Wed Oct 23 00:24:22 2024 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 ARC-Seal: i=1; a=rsa-sha256; t=1729176811; cv=none; d=zohomail.com; s=zohoarc; b=ZQiQC5PWMDwSKGqlqy+gJDNR5Pgz8Mfac6udCNC0hYDRkY98lm9ixmLvnlOEbuCMU1/RF0I9Z38vFdEhRO1SEBbmZUGTvqze4HM7xCfAQvOuijP2WQG82xkM3ww2/tfE+/FfGEbDnZfqyOtywmH5GNsXWtBT8o5Yvau4cfVoDQk= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1729176811; h=Content-Type:Content-Transfer-Encoding:Cc:Cc:Date:Date:From:From:In-Reply-To:List-Subscribe:List-Post:List-Id:List-Archive:List-Help:List-Unsubscribe:MIME-Version:Message-ID:References:Sender:Subject:Subject:To:To:Message-Id:Reply-To; bh=ROFq32OHcffyErje8nbh+cbnR480vNSOfFeXksAbJNo=; b=TosE6AyTca5L021INqr71P9iKdAVaeDqcrMpmjuRZ35lefkObLeFtOz818NOqNINYc16ydjh9bkNUiqNTp0j3OmGyPQ4yruiPIhqZytVAa/C4jGFTQqHReHydjrDtFzEvLbSvCXs5/ryRLCRDXXmlM8DMZ9NtBiATAB+IFyu62Q= 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 Return-Path: Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) by mx.zohomail.com with SMTPS id 1729176810910233.95046653859686; Thu, 17 Oct 2024 07:53:30 -0700 (PDT) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1t1RsC-0002xw-4f; Thu, 17 Oct 2024 10:53:08 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1t1RsA-0002th-5E for qemu-devel@nongnu.org; Thu, 17 Oct 2024 10:53:06 -0400 Received: from mail-pf1-x429.google.com ([2607:f8b0:4864:20::429]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1t1Rs8-0006tj-Ie for qemu-devel@nongnu.org; Thu, 17 Oct 2024 10:53:05 -0400 Received: by mail-pf1-x429.google.com with SMTP id d2e1a72fcca58-71e983487a1so413324b3a.2 for ; Thu, 17 Oct 2024 07:53:04 -0700 (PDT) Received: from carbon-x1.. ([2a01:e0a:e17:9700:16d2:7456:6634:9626]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-71e77371193sm4859580b3a.21.2024.10.17.07.52.56 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 17 Oct 2024 07:53:02 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=rivosinc-com.20230601.gappssmtp.com; s=20230601; t=1729176783; x=1729781583; darn=nongnu.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=ROFq32OHcffyErje8nbh+cbnR480vNSOfFeXksAbJNo=; b=B674B8l1E2vtzYtpKRwYNwYYqXFQk2QbP1WzmEzFMt5zMGWHjYVR4hQz+kkQG0wpp/ MWsSGLeUDO5tlFaXZvDld4lYRfz6z6Jn3MjIsPmGYYw0RquPJWDrWhWFUOoedN3CpSmZ IIBRHTbaSve7bg8YxxHbzlG15z0G22YwkRuXjEwau6W25M3RmnwWyR4YbRdIkZdPFRPd PLKLf9CFUhAd5BFfVBDFmfPXtYkWgPsT2KuyN2obwDLipOaRj5OxOKDhZQif4yTcJo/p 17YbXuRXmlqNx1wy/CgSN8pDXeL/U5apEHML03zNG/g322EgqJhBstOY/dqDxbgmJNNh auWw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1729176783; x=1729781583; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=ROFq32OHcffyErje8nbh+cbnR480vNSOfFeXksAbJNo=; b=b7kShxrzfhDF2Baep2OB4ezDZYapiBtq7PfzmlJX6urI4nb4SUUx4mJA1O7QKnul3V yNw1ZzSyncw3Q7wfVtWyFZUwqoXRNUwYkoidAY56YPtldIE+ZHzHb/WQgFvnqXhlru4q uySO9nFre3RW0tsxHvd++fOTHpEsnkDTkc/C2GcSlNO1etwjh6B5uEaaGcbj5oLxbofu 1+YzXHt3KCb7LKFgpz3wTDbFkDBqLmmFRhSP15l/kP7VBebin0/mR1Ubiw77XGoP4vGs l3IIztK7o1OLbCLhFUG6YYAFhye40cZ24WOVD0k4d7D46u7r+2NlqDXijvFcelCgAJTB 0c+g== X-Forwarded-Encrypted: i=1; AJvYcCWSPpQ85ojn6VHZAiBYeK7RRzvqq/EeF4D5iqd2OPa4ofAEMihI+9f3vlj/dNKWMUq9y4YS3WV50MP0@nongnu.org X-Gm-Message-State: AOJu0YxZHkMzHuqfQ3XGmzwVdfi7WLvYHWqYYqWmleZQTDvXsjQZ3F7j bZk0lQ71Y4/PcpgHFZm6+lgqB9MvWzHtXXSzEj1C7sRFUDERsjTnexKy0GTOlnw= X-Google-Smtp-Source: AGHT+IHsyu8NbVrWAmmUYrhz3x06P3pM4VDyiscQxYj9VFNOPaxiZpUMTm3lFreUZTeK7AfT8XGShQ== X-Received: by 2002:a05:6a00:1490:b0:71e:4414:eb21 with SMTP id d2e1a72fcca58-71e44154fa8mr30156605b3a.17.1729176783050; Thu, 17 Oct 2024 07:53:03 -0700 (PDT) From: =?UTF-8?q?Cl=C3=A9ment=20L=C3=A9ger?= To: qemu-riscv@nongnu.org, Palmer Dabbelt , Alistair Francis , Bin Meng Cc: =?UTF-8?q?Cl=C3=A9ment=20L=C3=A9ger?= , Weiwei Li , Daniel Henrique Barboza , Liu Zhiwei , Ved Shanbhogue , Atish Patra , qemu-devel@nongnu.org Subject: [PATCH v4 3/9] target/riscv: Implement Ssdbltrp sret, mret and mnret behavior Date: Thu, 17 Oct 2024 16:52:14 +0200 Message-ID: <20241017145226.365825-4-cleger@rivosinc.com> X-Mailer: git-send-email 2.45.2 In-Reply-To: <20241017145226.365825-1-cleger@rivosinc.com> References: <20241017145226.365825-1-cleger@rivosinc.com> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" 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=2607:f8b0:4864:20::429; envelope-from=cleger@rivosinc.com; helo=mail-pf1-x429.google.com X-Spam_score_int: -18 X-Spam_score: -1.9 X-Spam_bar: - X-Spam_report: (-1.9 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 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-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @rivosinc-com.20230601.gappssmtp.com) X-ZM-MESSAGEID: 1729176812390116600 When the Ssdbltrp extension is enabled, SSTATUS.SDT field is cleared when executing sret. When executing mret/mnret, SSTATUS.SDT is cleared when returning to U, VS or VU and VSSTATUS.SDT is cleared when returning to VU from HS. Signed-off-by: Cl=C3=A9ment L=C3=A9ger Reviewed-by: Alistair Francis --- target/riscv/op_helper.c | 35 ++++++++++++++++++++++++++++++++++- 1 file changed, 34 insertions(+), 1 deletion(-) diff --git a/target/riscv/op_helper.c b/target/riscv/op_helper.c index 180886f32a..dabc74de39 100644 --- a/target/riscv/op_helper.c +++ b/target/riscv/op_helper.c @@ -287,6 +287,18 @@ target_ulong helper_sret(CPURISCVState *env) get_field(mstatus, MSTATUS_SPIE)); mstatus =3D set_field(mstatus, MSTATUS_SPIE, 1); mstatus =3D set_field(mstatus, MSTATUS_SPP, PRV_U); + + if (riscv_cpu_cfg(env)->ext_ssdbltrp) { + if (riscv_has_ext(env, RVH)) { + target_ulong prev_vu =3D get_field(env->hstatus, HSTATUS_SPV) = && + prev_priv =3D=3D PRV_U; + /* Returning to VU from HS, vsstatus.sdt =3D 0 */ + if (!env->virt_enabled && prev_vu) { + env->vsstatus =3D set_field(env->vsstatus, MSTATUS_SDT, 0); + } + } + mstatus =3D set_field(mstatus, MSTATUS_SDT, 0); + } if (env->priv_ver >=3D PRIV_VERSION_1_12_0) { mstatus =3D set_field(mstatus, MSTATUS_MPRV, 0); } @@ -297,7 +309,6 @@ target_ulong helper_sret(CPURISCVState *env) target_ulong hstatus =3D env->hstatus; =20 prev_virt =3D get_field(hstatus, HSTATUS_SPV); - hstatus =3D set_field(hstatus, HSTATUS_SPV, 0); =20 env->hstatus =3D hstatus; @@ -328,6 +339,22 @@ static void check_ret_from_m_mode(CPURISCVState *env, = target_ulong retpc, riscv_raise_exception(env, RISCV_EXCP_INST_ACCESS_FAULT, GETPC()); } } +static target_ulong ssdbltrp_mxret(CPURISCVState *env, target_ulong mstatu= s, + target_ulong prev_priv, + target_ulong prev_virt) +{ + /* If returning to U, VS or VU, sstatus.sdt =3D 0 */ + if (prev_priv =3D=3D PRV_U || (prev_virt && + (prev_priv =3D=3D PRV_S || prev_priv =3D=3D PRV_U))) { + mstatus =3D set_field(mstatus, MSTATUS_SDT, 0); + /* If returning to VU, vsstatus.sdt =3D 0 */ + if (prev_virt && prev_priv =3D=3D PRV_U) { + env->vsstatus =3D set_field(env->vsstatus, MSTATUS_SDT, 0); + } + } + + return mstatus; +} =20 target_ulong helper_mret(CPURISCVState *env) { @@ -345,6 +372,9 @@ target_ulong helper_mret(CPURISCVState *env) mstatus =3D set_field(mstatus, MSTATUS_MPP, riscv_has_ext(env, RVU) ? PRV_U : PRV_M); mstatus =3D set_field(mstatus, MSTATUS_MPV, 0); + if (riscv_cpu_cfg(env)->ext_ssdbltrp) { + mstatus =3D ssdbltrp_mxret(env, mstatus, prev_priv, prev_virt); + } if ((env->priv_ver >=3D PRIV_VERSION_1_12_0) && (prev_priv !=3D PRV_M)= ) { mstatus =3D set_field(mstatus, MSTATUS_MPRV, 0); } @@ -378,6 +408,9 @@ target_ulong helper_mnret(CPURISCVState *env) if (prev_priv < PRV_M) { env->mstatus =3D set_field(env->mstatus, MSTATUS_MPRV, false); } + if (riscv_cpu_cfg(env)->ext_ssdbltrp) { + env->mstatus =3D ssdbltrp_mxret(env, env->mstatus, prev_priv, prev= _virt); + } =20 if (riscv_has_ext(env, RVH) && prev_virt) { riscv_cpu_swap_hypervisor_regs(env); --=20 2.45.2