From nobody Fri Dec 27 13:45:36 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=1732803231; cv=none; d=zohomail.com; s=zohoarc; b=mem2FLLAuwmvjVcyQvwLvQWyuUYsObr/sXEl40LNnB/GyZwIWNGHiSp0b3kRaMWC1DmDU00Ku4QOV6Aa3TQ5KiXYuo1uqovK4Q1NoC6LR0pWFwxD6/lRojw3iSNWNrtgsQk0XvYhpG/8ZEjkIgQJIQT0wtYbzZRaYqe00IFGwn8= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1732803231; 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=eaTDHyYGUwurrDx3I7AZnQtNa0ZJXKnA6MuUrQ8NqEw=; b=AK8yU0gzj1Cx0trmAyndD0bExIMT9dIAnhV5ThyFu+WN3IPnJF8RZ/bENEUl9xv7RvuVCvQcsw/k+BDuWFJQ7pLS13AFKKqZwZr/QjW+x21fwogMLAzy8u3TN4o4DPUh+jkJM8mTnGf7wS1cV0gGhA8+oTaAZukNDXSDA2dvziU= 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 1732803231355669.3565687008622; Thu, 28 Nov 2024 06:13:51 -0800 (PST) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1tGfGk-00058X-Hw; Thu, 28 Nov 2024 09:13:22 -0500 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 1tGfGi-000588-1X for qemu-devel@nongnu.org; Thu, 28 Nov 2024 09:13:20 -0500 Received: from mail-pl1-x62e.google.com ([2607:f8b0:4864:20::62e]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1tGfGg-0005ub-E6 for qemu-devel@nongnu.org; Thu, 28 Nov 2024 09:13:19 -0500 Received: by mail-pl1-x62e.google.com with SMTP id d9443c01a7336-2142214abd2so6644585ad.0 for ; Thu, 28 Nov 2024 06:13:18 -0800 (PST) Received: from carbon-x1.. ([2a01:e0a:e17:9700:16d2:7456:6634:9626]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-215218f452csm13829005ad.48.2024.11.28.06.13.10 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 28 Nov 2024 06:13:16 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=rivosinc-com.20230601.gappssmtp.com; s=20230601; t=1732803197; x=1733407997; 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=eaTDHyYGUwurrDx3I7AZnQtNa0ZJXKnA6MuUrQ8NqEw=; b=g6MP2DxEsKdzCUPOd+1rdLDxc8kp3pUrlsTHqx70EM+YZiWWw7khfsi8R8fdR9KwEz 8x5rXW6IqebtbxYUCGKa6ytxraLvcB3IPPT4djGyOGaIERdVj2pcm9rO/H4nZwrRuEHk FI1FYon2ZDpvQe8SkABekKpxtTQFiRFDv5VWdou5Jq+lp8iK/U3b/cq3qE//iW7FgNkK 59AIm2l35lMF+r80+82EMTbwxQrFm0xrflGuvu27ANUb0Yoi5B/X+LuO9lOH1x/xbDXd 3FJI+BNX2z+N1r1v4Xc3+jMJP7FRqS1DLzO7GPcDz0xhx2u+3pCl3c/NIeWNoZHAEGVv SP+Q== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1732803197; x=1733407997; 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=eaTDHyYGUwurrDx3I7AZnQtNa0ZJXKnA6MuUrQ8NqEw=; b=JHV3ICCfY9C+E2qe3M2mpxfH1dGtPp5SPWO45g3AY9rqAkyk6FGYZavn8pznh0b5VE QWQmhaSMuErNws1DBw2vujUMuInr703aXNlxKljPxvVT5+cSrHgAstxwyyuxQ0lCgUjR hE47cLnaP5b4qmVN7ls6lzdi+0USl6nVdkS2zrNG6b82B6fZp6BShA6BMGzAUDnn+h8y zZ/dsDWEdmxgh8gFtIVoGkYt8+9sNWPoskaX1d78PGij0nkpJJZHk8i85UXKoQ56CeBa kNbfQWPjeH3zrE9Ysk1Y+sCIjxcaD9TlQBDUEo2algt7EihDJ1Gt6O4JkiMnbQVtVRoS vNOA== X-Forwarded-Encrypted: i=1; AJvYcCWDSbVHwf14+5MkvGMvQie/GOwQirTn1jMiq5f5LUvndVH5AAohqfA2Ro/vgxig0SG6xeLOWr3YT1uY@nongnu.org X-Gm-Message-State: AOJu0YzFriOF+MerDdMYWf8ep7iyaWDjtKB9ePIISbjroytSeQJUUDMt xK6baYOycARKDZbBa8SmjO35GBA3s2RvykULK8fBGw+KLNXhmdRgxlXtNBuBT1I= X-Gm-Gg: ASbGncsP4UPduTl4ljcfpJ5xhoK5tkA7cPEqmnfUeOiUnEImdG+dNiz2EPWB8zdCV9v 3SLXBZUMSKToMKgzlFLWoUGroT6SJf5KvJRFvCPZHUzGqaFZ5n9xt43aqRtuvfiryFw7HVFNyHa j7/vqwXioLwRaMKRjFzR6oELfMAK5AVu2ORfHpmriLdrqJ05R9PN66pymQxo4RntMXtkWZA/Cda 6eBZM8yx1j9GGb7ks/2QoVbhifi9q3Q3Li9kNJ+8XhjOXSQuz8= X-Google-Smtp-Source: AGHT+IHXOSHBhQUDm4GJm/ij9WavbCZ/Ey4VnnTNbr+VuXy2Vlmxy6eDYCsj5qn3ExauY40+Wp3C6g== X-Received: by 2002:a17:902:d54e:b0:212:5b57:80ed with SMTP id d9443c01a7336-21501087642mr100730045ad.11.1732803196949; Thu, 28 Nov 2024 06:13:16 -0800 (PST) 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, Frank Chang Subject: [PATCH v6 3/9] target/riscv: Implement Ssdbltrp sret, mret and mnret behavior Date: Thu, 28 Nov 2024 15:12:23 +0100 Message-ID: <20241128141230.284320-4-cleger@rivosinc.com> X-Mailer: git-send-email 2.45.2 In-Reply-To: <20241128141230.284320-1-cleger@rivosinc.com> References: <20241128141230.284320-1-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::62e; envelope-from=cleger@rivosinc.com; helo=mail-pl1-x62e.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: 1732803232426019100 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 a4b625fcd9..eeacb2d1a1 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; @@ -337,6 +348,22 @@ 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) { @@ -354,6 +381,9 @@ 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); } @@ -395,6 +425,9 @@ 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