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Thu, 20 Apr 2023 02:21:27 -0700 (PDT) Received: from grind.dc1.ventanamicro.com ([191.255.108.232]) by smtp.gmail.com with ESMTPSA id t1-20020a056870e74100b0017280f7d653sm529668oak.35.2023.04.20.02.21.25 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 20 Apr 2023 02:21:27 -0700 (PDT) From: Daniel Henrique Barboza To: qemu-devel@nongnu.org Cc: qemu-riscv@nongnu.org, alistair.francis@wdc.com, bmeng@tinylab.org, liweiwei@iscas.ac.cn, zhiwei_liu@linux.alibaba.com, palmer@rivosinc.com, Daniel Henrique Barboza Subject: [PATCH RESEND v7 07/12] target/riscv/cpu.c: add priv_spec validate/disable_exts helpers Date: Thu, 20 Apr 2023 06:20:55 -0300 Message-Id: <20230420092100.177464-8-dbarboza@ventanamicro.com> X-Mailer: git-send-email 2.40.0 In-Reply-To: <20230420092100.177464-1-dbarboza@ventanamicro.com> References: <20230420092100.177464-1-dbarboza@ventanamicro.com> MIME-Version: 1.0 Received-SPF: pass client-ip=2001:4860:4864:20::34; envelope-from=dbarboza@ventanamicro.com; helo=mail-oa1-x34.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, T_SCC_BODY_TEXT_LINE=-0.01 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+incoming=patchwork.ozlabs.org@nongnu.org Sender: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org We're doing env->priv_spec validation and assignment at the start of riscv_cpu_realize(), which is fine, but then we're doing a force disable on extensions that aren't compatible with the priv version. This second step is being done too early. The disabled extensions might be re-enabled again in riscv_cpu_validate_set_extensions() by accident. A better place to put this code is at the end of riscv_cpu_validate_set_extensions() after all the validations are completed. Add a new helper, riscv_cpu_disable_priv_spec_isa_exts(), to disable the extesions after the validation is done. While we're at it, create a riscv_cpu_validate_priv_spec() helper to host all env->priv_spec related validation to unclog riscv_cpu_realize a bit. Signed-off-by: Daniel Henrique Barboza Reviewed-by: LIU Zhiwei Reviewed-by: Weiwei Li Reviewed-by: Alistair Francis --- target/riscv/cpu.c | 91 ++++++++++++++++++++++++++++------------------ 1 file changed, 56 insertions(+), 35 deletions(-) diff --git a/target/riscv/cpu.c b/target/riscv/cpu.c index 9bb0e6b180..c928925544 100644 --- a/target/riscv/cpu.c +++ b/target/riscv/cpu.c @@ -827,6 +827,52 @@ static void riscv_cpu_validate_v(CPURISCVState *env, RISCVCPUConfig *cfg, env->vext_ver = vext_version; } +static void riscv_cpu_validate_priv_spec(RISCVCPU *cpu, Error **errp) +{ + CPURISCVState *env = &cpu->env; + int priv_version = -1; + + if (cpu->cfg.priv_spec) { + if (!g_strcmp0(cpu->cfg.priv_spec, "v1.12.0")) { + priv_version = PRIV_VERSION_1_12_0; + } else if (!g_strcmp0(cpu->cfg.priv_spec, "v1.11.0")) { + priv_version = PRIV_VERSION_1_11_0; + } else if (!g_strcmp0(cpu->cfg.priv_spec, "v1.10.0")) { + priv_version = PRIV_VERSION_1_10_0; + } else { + error_setg(errp, + "Unsupported privilege spec version '%s'", + cpu->cfg.priv_spec); + return; + } + + env->priv_ver = priv_version; + } +} + +static void riscv_cpu_disable_priv_spec_isa_exts(RISCVCPU *cpu) +{ + CPURISCVState *env = &cpu->env; + int i; + + /* Force disable extensions if priv spec version does not match */ + for (i = 0; i < ARRAY_SIZE(isa_edata_arr); i++) { + if (isa_ext_is_enabled(cpu, &isa_edata_arr[i]) && + (env->priv_ver < isa_edata_arr[i].min_version)) { + isa_ext_update_enabled(cpu, &isa_edata_arr[i], false); +#ifndef CONFIG_USER_ONLY + warn_report("disabling %s extension for hart 0x" TARGET_FMT_lx + " because privilege spec version does not match", + isa_edata_arr[i].name, env->mhartid); +#else + warn_report("disabling %s extension because " + "privilege spec version does not match", + isa_edata_arr[i].name); +#endif + } + } +} + /* * Check consistency between chosen extensions while setting * cpu->cfg accordingly. @@ -1045,6 +1091,12 @@ static void riscv_cpu_validate_set_extensions(RISCVCPU *cpu, Error **errp) cpu->cfg.ext_zksed = true; cpu->cfg.ext_zksh = true; } + + /* + * Disable isa extensions based on priv spec after we + * validated and set everything we need. + */ + riscv_cpu_disable_priv_spec_isa_exts(cpu); } #ifndef CONFIG_USER_ONLY @@ -1144,7 +1196,6 @@ static void riscv_cpu_realize(DeviceState *dev, Error **errp) CPURISCVState *env = &cpu->env; RISCVCPUClass *mcc = RISCV_CPU_GET_CLASS(dev); CPUClass *cc = CPU_CLASS(mcc); - int i, priv_version = -1; Error *local_err = NULL; cpu_exec_realizefn(cs, &local_err); @@ -1153,23 +1204,10 @@ static void riscv_cpu_realize(DeviceState *dev, Error **errp) return; } - if (cpu->cfg.priv_spec) { - if (!g_strcmp0(cpu->cfg.priv_spec, "v1.12.0")) { - priv_version = PRIV_VERSION_1_12_0; - } else if (!g_strcmp0(cpu->cfg.priv_spec, "v1.11.0")) { - priv_version = PRIV_VERSION_1_11_0; - } else if (!g_strcmp0(cpu->cfg.priv_spec, "v1.10.0")) { - priv_version = PRIV_VERSION_1_10_0; - } else { - error_setg(errp, - "Unsupported privilege spec version '%s'", - cpu->cfg.priv_spec); - return; - } - } - - if (priv_version >= PRIV_VERSION_1_10_0) { - env->priv_ver = priv_version; + riscv_cpu_validate_priv_spec(cpu, &local_err); + if (local_err != NULL) { + error_propagate(errp, local_err); + return; } riscv_cpu_validate_misa_priv(env, &local_err); @@ -1178,23 +1216,6 @@ static void riscv_cpu_realize(DeviceState *dev, Error **errp) return; } - /* Force disable extensions if priv spec version does not match */ - for (i = 0; i < ARRAY_SIZE(isa_edata_arr); i++) { - if (isa_ext_is_enabled(cpu, &isa_edata_arr[i]) && - (env->priv_ver < isa_edata_arr[i].min_version)) { - isa_ext_update_enabled(cpu, &isa_edata_arr[i], false); -#ifndef CONFIG_USER_ONLY - warn_report("disabling %s extension for hart 0x" TARGET_FMT_lx - " because privilege spec version does not match", - isa_edata_arr[i].name, env->mhartid); -#else - warn_report("disabling %s extension because " - "privilege spec version does not match", - isa_edata_arr[i].name); -#endif - } - } - if (cpu->cfg.epmp && !cpu->cfg.pmp) { /* * Enhanced PMP should only be available