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([2a01:e0a:e17:9700:16d2:7456:6634:9626]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-215218f452csm13829005ad.48.2024.11.28.06.12.55 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 28 Nov 2024 06:13:01 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=rivosinc-com.20230601.gappssmtp.com; s=20230601; t=1732803182; x=1733407982; 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=C4JUFLTOJhJslmXjXCGh+2VEFVmYCejzSQzv/yR+Yn0=; b=vIkFETEstjkOlotQ7m8WscOZeWQd0wUhXoRCJVt7MnxHfzMU4R/wuVJHnzRrNbOFs+ 0CZGGhD3NBlka+OxSxst3ZD0z6e/Trz8omCHXqnUYtD4rA2GZIw2kVxTwmLVajJ3g6zK qnconk+tf/JhHiT3wt+Hd2mq0inrXXZ+3cbFxBEDurE9Zlxajk+krpZsV01TeIr/0GjB ZmQLW6MCRip15rY2VNRW926oj+NE9/T1Is8JiX3ZG5W3bUCETarI42CbnnubBAAssfRX NomHEnhl8ddJ+Ma/gveXciF0cIIX1KmkvE+7PRdPbX9BW5lk8g9ESaBWLCAZbuWmj6dF yzwA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1732803182; x=1733407982; 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=C4JUFLTOJhJslmXjXCGh+2VEFVmYCejzSQzv/yR+Yn0=; b=J44DqBGBBW/xD9XXfS7zQbLnpYcSzU+t8m8M2nNiRmYRZXfH0jIqXyFueES9FncGlW oAJVkedz3VSLI25awrNtD8MyyR6I4iDJMIzO2TGtyMTFMMAEoxp0ehBnsi88U8bGRHG9 vSalk4gXydvqlKOn6aGeDbXPmaYRgp5MmrdM8q2/yLnSnfznViy+wjt9bZZ0NakIlej2 EDi1gOQdTRDB/Ozjwvx3V72kQNj2OzdiW7epaGb6k+A3YXDJ/6HuvwEyH0k8aEGZwYo+ ZzTvhq28JJGD6ui/KthkU9mEUehQJ72PtYkBS6EiySEAQbDPwMTJeN7mToG4WPg1FOU9 AJOw== X-Forwarded-Encrypted: i=1; AJvYcCXYUgLRqil50bVFD+t/cV+7HS2wM2mp/FUeZGNdL1caMmnmek7zx50GtBJfwcyxZWV1TFelmrXqAG4A@nongnu.org X-Gm-Message-State: AOJu0Ywc/GkjYKSHwKLi8QIWXf3sdb6U6Ir4PcvAPi+/pOR245nL/m1G bpxg4M3seynjTV4BCkv2H1whnCyWeOSke+zBSd3qhF+hori9Bl5Jupz6vmVyoNE= X-Gm-Gg: ASbGncvpkqm9/mi7uCDoKCvdKquL9VHY4dYOesIjzXgr8IG6oHNRhnynxDC1nA40pLH p/mu13mYRluWY4OGq6rrblMOk1I4NBdPLUUggoemQ/j2XOOKgXN+OmP4XYAPcqu7vAaXlG6gMAQ 3WB+s3Vz7WnxRf6dcBuQQPKgz+Z26mrJnFJRM9+BYoHOgBLPPyPAaDfSlXt8LAS+Afy6tDB0jkM zJjhScTTkhe+Efapbyy4I1+aRojV902hS1hmPdfY9lJRt7593Y= X-Google-Smtp-Source: AGHT+IEBvrCQoPSVZ9VjdSgKjU7C86n9zuigE2JYsVRZBB5oQ1RemhVbYcsZR4FVdgb24Mqkqw2tiQ== X-Received: by 2002:a17:902:ea08:b0:212:63db:bb15 with SMTP id d9443c01a7336-21501b593b5mr106675755ad.38.1732803182166; Thu, 28 Nov 2024 06:13:02 -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 1/9] target/riscv: fix henvcfg potentially containing stale bits Date: Thu, 28 Nov 2024 15:12:21 +0100 Message-ID: <20241128141230.284320-2-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::634; envelope-from=cleger@rivosinc.com; helo=mail-pl1-x634.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: 1732803326782019100 With the current implementation, if we had the following scenario: - Set bit x in menvcfg - Set bit x in henvcfg - Clear bit x in menvcfg then, the internal variable env->henvcfg would still contain bit x due to both a wrong menvcfg mask used in write_henvcfg() as well as a missing update of henvcfg upon menvcfg update. This can lead to some wrong interpretation of the context. In order to update henvcfg upon menvcfg writing, call write_henvcfg() after writing menvcfg. Clearing henvcfg upon writing the new value is also needed in write_henvcfg() as well as clearing henvcfg upper part when writing it with write_henvcfgh(). Signed-off-by: Cl=C3=A9ment L=C3=A9ger Reviewed-by: Alistair Francis Reviewed-by: Daniel Henrique Barboza --- target/riscv/csr.c | 10 ++++++++-- 1 file changed, 8 insertions(+), 2 deletions(-) diff --git a/target/riscv/csr.c b/target/riscv/csr.c index 5d8d0d7514..98c683df60 100644 --- a/target/riscv/csr.c +++ b/target/riscv/csr.c @@ -2383,6 +2383,8 @@ static RISCVException read_menvcfg(CPURISCVState *env= , int csrno, return RISCV_EXCP_NONE; } =20 +static RISCVException write_henvcfg(CPURISCVState *env, int csrno, + target_ulong val); static RISCVException write_menvcfg(CPURISCVState *env, int csrno, target_ulong val) { @@ -2403,6 +2405,7 @@ static RISCVException write_menvcfg(CPURISCVState *en= v, int csrno, } } env->menvcfg =3D (env->menvcfg & ~mask) | (val & mask); + write_henvcfg(env, CSR_HENVCFG, env->henvcfg); =20 return RISCV_EXCP_NONE; } @@ -2414,6 +2417,8 @@ static RISCVException read_menvcfgh(CPURISCVState *en= v, int csrno, return RISCV_EXCP_NONE; } =20 +static RISCVException write_henvcfgh(CPURISCVState *env, int csrno, + target_ulong val); static RISCVException write_menvcfgh(CPURISCVState *env, int csrno, target_ulong val) { @@ -2424,6 +2429,7 @@ static RISCVException write_menvcfgh(CPURISCVState *e= nv, int csrno, uint64_t valh =3D (uint64_t)val << 32; =20 env->menvcfg =3D (env->menvcfg & ~mask) | (valh & mask); + write_henvcfgh(env, CSR_HENVCFGH, env->henvcfg >> 32); =20 return RISCV_EXCP_NONE; } @@ -2513,7 +2519,7 @@ static RISCVException write_henvcfg(CPURISCVState *en= v, int csrno, } } =20 - env->henvcfg =3D (env->henvcfg & ~mask) | (val & mask); + env->henvcfg =3D val & mask; =20 return RISCV_EXCP_NONE; } @@ -2546,7 +2552,7 @@ static RISCVException write_henvcfgh(CPURISCVState *e= nv, int csrno, return ret; } =20 - env->henvcfg =3D (env->henvcfg & ~mask) | (valh & mask); + env->henvcfg =3D (env->henvcfg & 0xFFFFFFFF) | (valh & mask); return RISCV_EXCP_NONE; } =20 --=20 2.45.2