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[173.198.77.218]) by smtp.gmail.com with ESMTPSA id j10-20020a170902690a00b001992e74d058sm2665348plk.7.2023.02.20.15.26.31 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 20 Feb 2023 15:26:32 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; 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=Hddjs2iU8lgJmQnwAvhIIZw97YOfc6Ski+WodJ2W4+A=; b=V3BLRJTX8Qq4f7g5vSdXiAZvyvdi8X3Eg62l3jCCNzKLoJsTlQDsN9wnRdFOAXdBzp 96d8cZibJmYrzOAGpzEgn8AfvjAe9h+M6Z8Ny2JohJr4RR6UqB9uXGOOnqZiwzcgpt6o yOgaV4QDSCTXJwYHvacgXWIrXmoJ8HX4bMQWG/QoTRsbhGcC0b7RSyviT42G6QBrXNk8 B9f0g+7IV85ZxamXJUT7+5cA87MZsWlpFnPlHHfZlmMWmsygIveoei5/D68pw2M8BntV 4lb7NSLEpBdp3t3KNCDlxelZjf8kJ05puNjkr77mF4waqCag2qgm0fVIHzkQGo58Kzmc d/tQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; 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=Hddjs2iU8lgJmQnwAvhIIZw97YOfc6Ski+WodJ2W4+A=; b=5oDe8lFywDuV+Lzp69O6Brm5mi9KTwIxy1w36Cip45TpRNxiX9vevNCnXyShEmr9rR h/MjwmfyB9wbkCTpy3wqLDuSelpcdDA5LgF7NNYTxA3LxZqX6Bwk2iit6+XwpxW3FYyW hb93W1eJ979aA2vxS5mEaK2mA+gDUezmxOLXFv27L413RQQFZStoFHxUtyCJE/C93Fkl HaBWjvPJjtvGGjURNl/FU5M3VttfZ+7g1IBJEHKjbSs+grUPSuyfLfcCSVnzQt6WGeuJ osCHekgNq1coAkgMahDexKtPEhEUugBBgPbpvOD2PoxhJQUgaeSAmD2bG9icycl6zh7Z 9H3Q== X-Gm-Message-State: AO0yUKXuWOJPLjFX++dvklUNIWh2NPSzUA+KQA+30kcejLCrLEM4eD8H +G716dVtF67ua9t8mQ/G2aSfg62rMsynxmZYWDxhzg== X-Google-Smtp-Source: AK7set/kvPnaZ9oPMeGJCfZdHVdUBR+3E9oDcilzpecbQ2DTTVZGVnJB1nPh6hvaTiKWzvNAYVtvAg== X-Received: by 2002:a17:902:e547:b0:19a:abb0:1e with SMTP id n7-20020a170902e54700b0019aabb0001emr4473312plf.38.1676935592731; Mon, 20 Feb 2023 15:26:32 -0800 (PST) From: Richard Henderson To: qemu-devel@nongnu.org Cc: qemu-arm@nongnu.org Subject: [PATCH v2 01/21] target/arm: Rewrite check_s2_mmu_setup Date: Mon, 20 Feb 2023 13:26:06 -1000 Message-Id: <20230220232626.429947-2-richard.henderson@linaro.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20230220232626.429947-1-richard.henderson@linaro.org> References: <20230220232626.429947-1-richard.henderson@linaro.org> 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=2607:f8b0:4864:20::1042; envelope-from=richard.henderson@linaro.org; helo=mail-pj1-x1042.google.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-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 @linaro.org) X-ZM-MESSAGEID: 1676935758163100005 Content-Type: text/plain; charset="utf-8" Integrate neighboring code from get_phys_addr_lpae which computed starting level, as it is easier to validate when doing both at the same time. Mirror the checks at the start of AArch{64,32}.S2Walk, especially S2InvalidSL and S2InconsistentSL. This reverts 49ba115bb74, which was incorrect -- there is nothing in the ARM pseudocode that depends on TxSZ, i.e. outputsize; the pseudocode is consistent in referencing PAMax. Fixes: 49ba115bb74 ("target/arm: Pass outputsize down to check_s2_mmu_setup= ") Signed-off-by: Richard Henderson --- target/arm/ptw.c | 173 ++++++++++++++++++++++++++--------------------- 1 file changed, 97 insertions(+), 76 deletions(-) diff --git a/target/arm/ptw.c b/target/arm/ptw.c index 2b125fff44..6fb72fb086 100644 --- a/target/arm/ptw.c +++ b/target/arm/ptw.c @@ -1077,70 +1077,119 @@ static ARMVAParameters aa32_va_parameters(CPUARMSt= ate *env, uint32_t va, * check_s2_mmu_setup * @cpu: ARMCPU * @is_aa64: True if the translation regime is in AArch64 state - * @startlevel: Suggested starting level - * @inputsize: Bitsize of IPAs + * @tcr: VTCR_EL2 or VSTCR_EL2 + * @ds: Effective value of TCR.DS. + * @iasize: Bitsize of IPAs * @stride: Page-table stride (See the ARM ARM) * - * Returns true if the suggested S2 translation parameters are OK and - * false otherwise. + * Decode the starting level of the S2 lookup, returning INT_MIN if + * the configuration is invalid. */ -static bool check_s2_mmu_setup(ARMCPU *cpu, bool is_aa64, int level, - int inputsize, int stride, int outputsize) +static int check_s2_mmu_setup(ARMCPU *cpu, bool is_aa64, uint64_t tcr, + bool ds, int iasize, int stride) { - const int grainsize =3D stride + 3; - int startsizecheck; - - /* - * Negative levels are usually not allowed... - * Except for FEAT_LPA2, 4k page table, 52-bit address space, which - * begins with level -1. Note that previous feature tests will have - * eliminated this combination if it is not enabled. - */ - if (level < (inputsize =3D=3D 52 && stride =3D=3D 9 ? -1 : 0)) { - return false; - } - - startsizecheck =3D inputsize - ((3 - level) * stride + grainsize); - if (startsizecheck < 1 || startsizecheck > stride + 4) { - return false; - } + int sl0, sl2, startlevel, granulebits, levels; + int s1_min_iasize, s1_max_iasize; =20 + sl0 =3D extract32(tcr, 6, 2); if (is_aa64) { + /* + * AArch64.S2InvalidTxSZ: While we checked tsz_oob near the top of + * get_phys_addr_lpae, that used aa64_va_parameters which apply + * to aarch64. If Stage1 is aarch32, the min_txsz is larger. + * See AArch64.S2MinTxSZ, where min_tsz is 24, translated to + * inputsize is 64 - 24 =3D 40. + */ + if (iasize < 40 && !arm_el_is_aa64(&cpu->env, 1)) { + goto fail; + } + + /* + * AArch64.S2InvalidSL: Interpretation of SL depends on the page s= ize, + * so interleave AArch64.S2StartLevel. + */ switch (stride) { - case 13: /* 64KB Pages. */ - if (level =3D=3D 0 || (level =3D=3D 1 && outputsize <=3D 42)) { - return false; + case 9: /* 4KB */ + /* SL2 is RES0 unless DS=3D1 & 4KB granule. */ + sl2 =3D extract64(tcr, 33, 1); + if (ds && sl2) { + if (sl0 !=3D 0) { + goto fail; + } + startlevel =3D -1; + } else { + startlevel =3D 2 - sl0; + switch (sl0) { + case 2: + if (arm_pamax(cpu) < 44) { + goto fail; + } + break; + case 3: + if (!cpu_isar_feature(aa64_st, cpu)) { + goto fail; + } + startlevel =3D 3; + break; + } } break; - case 11: /* 16KB Pages. */ - if (level =3D=3D 0 || (level =3D=3D 1 && outputsize <=3D 40)) { - return false; + case 11: /* 16KB */ + switch (sl0) { + case 2: + if (arm_pamax(cpu) < 42) { + goto fail; + } + break; + case 3: + if (!ds) { + goto fail; + } + break; } + startlevel =3D 3 - sl0; break; - case 9: /* 4KB Pages. */ - if (level =3D=3D 0 && outputsize <=3D 42) { - return false; + case 13: /* 64KB */ + switch (sl0) { + case 2: + if (arm_pamax(cpu) < 44) { + goto fail; + } + break; + case 3: + goto fail; } + startlevel =3D 3 - sl0; break; default: g_assert_not_reached(); } - - /* Inputsize checks. */ - if (inputsize > outputsize && - (arm_el_is_aa64(&cpu->env, 1) || inputsize > 40)) { - /* This is CONSTRAINED UNPREDICTABLE and we choose to fault. = */ - return false; - } } else { - /* AArch32 only supports 4KB pages. Assert on that. */ + /* + * Things are simpler for AArch32 EL2, with only 4k pages. + * There is no separate S2InvalidSL function, but AArch32.S2Walk + * begins with walkparms.sl0 in {'1x'}. + */ assert(stride =3D=3D 9); - - if (level =3D=3D 0) { - return false; + if (sl0 >=3D 2) { + goto fail; } + startlevel =3D 2 - sl0; } - return true; + + /* AArch{64,32}.S2InconsistentSL are functionally equivalent. */ + levels =3D 3 - startlevel; + granulebits =3D stride + 3; + + s1_min_iasize =3D levels * stride + granulebits + 1; + s1_max_iasize =3D s1_min_iasize + (stride - 1) + 4; + + if (iasize >=3D s1_min_iasize && iasize <=3D s1_max_iasize) { + return startlevel; + } + + fail: + return INT_MIN; } =20 /** @@ -1296,38 +1345,10 @@ static bool get_phys_addr_lpae(CPUARMState *env, S1= Translate *ptw, */ level =3D 4 - (inputsize - 4) / stride; } else { - /* - * For stage 2 translations the starting level is specified by the - * VTCR_EL2.SL0 field (whose interpretation depends on the page si= ze) - */ - uint32_t sl0 =3D extract32(tcr, 6, 2); - uint32_t sl2 =3D extract64(tcr, 33, 1); - int32_t startlevel; - bool ok; - - /* SL2 is RES0 unless DS=3D1 & 4kb granule. */ - if (param.ds && stride =3D=3D 9 && sl2) { - if (sl0 !=3D 0) { - level =3D 0; - goto do_translation_fault; - } - startlevel =3D -1; - } else if (!aarch64 || stride =3D=3D 9) { - /* AArch32 or 4KB pages */ - startlevel =3D 2 - sl0; - - if (cpu_isar_feature(aa64_st, cpu)) { - startlevel &=3D 3; - } - } else { - /* 16KB or 64KB pages */ - startlevel =3D 3 - sl0; - } - - /* Check that the starting level is valid. */ - ok =3D check_s2_mmu_setup(cpu, aarch64, startlevel, - inputsize, stride, outputsize); - if (!ok) { + int startlevel =3D check_s2_mmu_setup(cpu, aarch64, tcr, param.ds, + inputsize, stride); + if (startlevel =3D=3D INT_MIN) { + level =3D 0; goto do_translation_fault; } level =3D startlevel; --=20 2.34.1