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[92.145.124.62]) by smtp.gmail.com with ESMTPSA id c1-20020a5d4f01000000b002fc0de07930sm2170813wru.13.2023.04.20.08.02.23 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 20 Apr 2023 08:02:24 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=rivosinc-com.20221208.gappssmtp.com; s=20221208; t=1682002945; x=1684594945; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:from:to:cc:subject:date:message-id:reply-to; bh=So7yjB+0zezsP+grOmdMLTlhaDdmkzACsfLRLUt/J98=; b=nIGzd8swMQXTIG+hSPvd6eDKpWZlaM9YYe+OM3mhatkCktIZHhWDnbl8O3EKpSQF+5 CqhO5y4ZCJAjyfcCytzgRi17rfF1xcZUtds3T+jCKe6DmGaD5Yv6X8siCYnppXtIbhEp va6k45G+daIAIOoIhV2he9y0AObmyKP+AClAtH42cR+GLq7ZkYlE/U90H8qwSHj/0/59 p4hGYVvPvKGjB1nIfTGaIN+dKDyjvHiMjGDduKSd7BrnLdawWbhMX7Ul1omasMzKV92t KSA5/RyorH4kN68ONfCMQ7u+EM432acwlg3+ru85GB/9ePWbH8DUh1hlQY21acK+0Oh+ fynA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1682002945; x=1684594945; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=So7yjB+0zezsP+grOmdMLTlhaDdmkzACsfLRLUt/J98=; b=Sh2l5VEV6UVauzwJJ8RHkAQMZFbfnEFYWGVJyq2T+6FMGyUCJBAoLawxspQ/KOWXHS FdsaGtaXBuIeUaq1UnIIIE3h/qzPlCm+LpqBP5DMUdM4k795Lsv39LBi3K2373rGvfKn n9AMSpO2svVhDLDj6cfghmwCg+O7FfSrLNr7pA4WbpoY52/CPdl5ALwJ6sAKvhkOInqi lvTq24TkmkVn35pSCdKUHQeuP3zoZJFSffmRMp/QY/TmYLqDE7/kqoeaxSkhOq72Ic75 0LsR+pKBVlTsvJu3HmWW1eKDCq88gUif38WFO6HCNbUBIdg2voABszZO8fv/ZDJ8drV/ izZA== X-Gm-Message-State: AAQBX9fPs5i/ic/trpzejme1ohxe4iva5ktvIFOWN+4vKuM1nehVafr5 /PsbS1pPh8C5pn4spV65AOW2vw== X-Google-Smtp-Source: AKy350ZeOwzK8akOkkzZ4rej6F9KBX8JSI6YNpOHXzJeT+0FrAEK9cCNplHQ0dJmbu8yea1E7OSd0Q== X-Received: by 2002:a5d:4572:0:b0:2f4:a552:b411 with SMTP id a18-20020a5d4572000000b002f4a552b411mr1396105wrc.46.1682002944787; Thu, 20 Apr 2023 08:02:24 -0700 (PDT) From: Alexandre Ghiti To: Palmer Dabbelt , Alistair Francis , Bin Meng , qemu-riscv@nongnu.org, qemu-devel@nongnu.org Cc: Alexandre Ghiti , Andrea Parri Subject: [PATCH v3] riscv: Make sure an exception is raised if a pte is malformed Date: Thu, 20 Apr 2023 17:02:20 +0200 Message-Id: <20230420150220.60919-1-alexghiti@rivosinc.com> X-Mailer: git-send-email 2.37.2 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=2a00:1450:4864:20::32b; envelope-from=alexghiti@rivosinc.com; helo=mail-wm1-x32b.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, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=unavailable 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.20221208.gappssmtp.com) X-ZM-MESSAGEID: 1682003027780100001 Content-Type: text/plain; charset="utf-8" As per the specification, in 64-bit, if any of the pte reserved bits 60-54 is set an exception should be triggered (see 4.4.1, "Addressing and Memory Protection"). In addition, we must check the napot/pbmt bits are not set if those extensions are not active. Reported-by: Andrea Parri Signed-off-by: Alexandre Ghiti Reviewed-by: Alistair Francis --- Changes in v3: - Rebase on top of https://github.com/alistair23/qemu/tree/riscv-to-apply.n= ext Changes in v2: - Handle napot and pbmt exception target/riscv/cpu_bits.h | 1 + target/riscv/cpu_helper.c | 15 +++++++++++---- 2 files changed, 12 insertions(+), 4 deletions(-) diff --git a/target/riscv/cpu_bits.h b/target/riscv/cpu_bits.h index fb63b8e125..59f0ffd9e1 100644 --- a/target/riscv/cpu_bits.h +++ b/target/riscv/cpu_bits.h @@ -644,6 +644,7 @@ typedef enum { #define PTE_SOFT 0x300 /* Reserved for Software */ #define PTE_PBMT 0x6000000000000000ULL /* Page-based memory typ= es */ #define PTE_N 0x8000000000000000ULL /* NAPOT translation */ +#define PTE_RESERVED 0x1FC0000000000000ULL /* Reserved bits */ #define PTE_ATTR (PTE_N | PTE_PBMT) /* All attributes bits */ =20 /* Page table PPN shift amount */ diff --git a/target/riscv/cpu_helper.c b/target/riscv/cpu_helper.c index b68dcfe7b6..57d04385f1 100644 --- a/target/riscv/cpu_helper.c +++ b/target/riscv/cpu_helper.c @@ -927,13 +927,20 @@ restart: =20 if (riscv_cpu_sxl(env) =3D=3D MXL_RV32) { ppn =3D pte >> PTE_PPN_SHIFT; - } else if (pbmte || riscv_cpu_cfg(env)->ext_svnapot) { - ppn =3D (pte & (target_ulong)PTE_PPN_MASK) >> PTE_PPN_SHIFT; } else { - ppn =3D pte >> PTE_PPN_SHIFT; - if ((pte & ~(target_ulong)PTE_PPN_MASK) >> PTE_PPN_SHIFT) { + if (pte & PTE_RESERVED) { + return TRANSLATE_FAIL; + } + + if (!pbmte && (pte & PTE_PBMT)) { return TRANSLATE_FAIL; } + + if (!riscv_cpu_cfg(env)->ext_svnapot && (pte & PTE_N)) { + return TRANSLATE_FAIL; + } + + ppn =3D (pte & (target_ulong)PTE_PPN_MASK) >> PTE_PPN_SHIFT; } =20 if (!(pte & PTE_V)) { --=20 2.37.2