From patchwork Thu Dec 21 17:51:27 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Daniel Henrique Barboza X-Patchwork-Id: 13502481 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 1CB9CC35274 for ; Thu, 21 Dec 2023 17:54:25 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1rGNDV-0002bV-Tk; Thu, 21 Dec 2023 12:52:18 -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 1rGNDN-0002Xf-99 for qemu-devel@nongnu.org; Thu, 21 Dec 2023 12:52:10 -0500 Received: from mail-pf1-x42b.google.com ([2607:f8b0:4864:20::42b]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1rGNDI-0007yM-LJ for qemu-devel@nongnu.org; Thu, 21 Dec 2023 12:52:08 -0500 Received: by mail-pf1-x42b.google.com with SMTP id d2e1a72fcca58-6d946beebe6so679754b3a.1 for ; Thu, 21 Dec 2023 09:52:04 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ventanamicro.com; s=google; t=1703181122; x=1703785922; 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=j91xsS9GxAzzQFt6q9VKwUiC8wXlZKnXVeK5AKolmUI=; b=jmQGwoIZY4nHMlVD9DiM6YHmW0STPUilPAGfsROSrWsIBHjdPX5UkcBGIThLyAcwrF qpFB4weuWv5Jc8AZcFkKXV0K1Q2b4rq0LPxgUCaKqlZNNky2R6TYzSTkBskBHQgacoYq jhz/+Etb3dMjpbQ7b3b+mW7M8WlMhoPq62LiUEdbRPqw7AQaP7wIQTJvewyezdC9+pxr HIqR2K7md7VLu0xkbGbbbu7s5A1A4So0tuZW433ddF4ZENi4mfOoX1nUV9FhF+1ynM4+ EvWtKtAQnuv1crKrbsEe4+nHQNwhczMDl35Fnf+u9PVW1kXcDZ/7SSTAzH5VHLhSSMf9 3TEg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1703181122; x=1703785922; 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=j91xsS9GxAzzQFt6q9VKwUiC8wXlZKnXVeK5AKolmUI=; b=JPfffV/j67ySBcuFcEJj/cnoNB/qoSi3wxR26RH7hyjB2IWFwiCUWG2E9DDFXQCYdw mo1EWNrbSbCbfJJiLbJ7qe7hx1VDsqXiis4zCUvZGWMdluPyktBcMTznbACxYKdlgKXk WilDHWBZjezEJK+xGUQEQPxxc7hixJa+x8vouMTbzUVPmxt7WcMHXWOYW/6avJWFzgTO Kpw39E8eGzUNmwy4JkiyDXrfiwjOlt7wSXydEVkSJcCEss0cinrGqpl0gRSbRwlHkAGl UfYtXg9lIonHjIM1jdhUtj1KPTf3d4Jic23/aD2s+2blwrZLzKx7X/Oda/gFG+Y3BDdu +D2w== X-Gm-Message-State: AOJu0YztfT8Lf9mEhM9kzZwOD6jJ2zk4wkAEigh+JFQkw7lLiw45WxJm 4+yq6m/eBMXqVeqpKW4PTPY9eoPNGn/GZUBUOM3St4h1l2PHOA== X-Google-Smtp-Source: AGHT+IFebWjFsfiCq8LzhTEdnsiEpDOR8NS1vIzjunvd2LY5uQRaGY4AD3rLS3ZrTIn+QoKNyusvSQ== X-Received: by 2002:a05:6a00:1d20:b0:6d9:40ad:7544 with SMTP id a32-20020a056a001d2000b006d940ad7544mr56357pfx.16.1703181122402; Thu, 21 Dec 2023 09:52:02 -0800 (PST) Received: from grind.dc1.ventanamicro.com ([179.93.21.205]) by smtp.gmail.com with ESMTPSA id w10-20020a63f50a000000b005b18c53d73csm1806261pgh.16.2023.12.21.09.51.59 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 21 Dec 2023 09:52:02 -0800 (PST) From: Daniel Henrique Barboza To: qemu-devel@nongnu.org Cc: qemu-riscv@nongnu.org, alistair.francis@wdc.com, bmeng@tinylab.org, liwei1518@gmail.com, zhiwei_liu@linux.alibaba.com, palmer@rivosinc.com, ajones@ventanamicro.com, Daniel Henrique Barboza Subject: [PATCH 06/16] target/riscv: rework 'priv_spec' Date: Thu, 21 Dec 2023 14:51:27 -0300 Message-ID: <20231221175137.497379-7-dbarboza@ventanamicro.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20231221175137.497379-1-dbarboza@ventanamicro.com> References: <20231221175137.497379-1-dbarboza@ventanamicro.com> MIME-Version: 1.0 Received-SPF: pass client-ip=2607:f8b0:4864:20::42b; envelope-from=dbarboza@ventanamicro.com; helo=mail-pf1-x42b.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=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+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org 'priv_spec' and 'vext_spec' are two string options used as a fancy way of setting integers in the CPU state (cpu->env.priv_ver and cpu->env.vext_ver). It requires us to deal with string parsing and to store them in cpu_cfg. We must support these string options, but we don't need to store them. We have a precedence for this kind of arrangement in target/ppc/compat.c, ppc_compat_prop_get|set, getters and setters used for the 'max-cpu-compat' class property of the pseries ppc64 machine. We'll do the same with both 'priv_spec' and 'vext_spec'. For 'priv_spec', the validation from riscv_cpu_validate_priv_spec() will be done by the prop_priv_spec_set() setter, while also preventing it to be changed for vendor CPUs. Add two helpers that converts env->priv_ver back and forth to its string representation. These helpers allow us to get a string and set 'env->priv_ver' and return a string giving the current env->priv_ver value. In other words, make the cpu->cfg.priv_spec string obsolete. Last but not the least, move the reworked 'priv_spec' option to riscv_cpu_properties[]. After all said and done, we don't need to store the 'priv_spec' string in the CPU state, and we're now protecting vendor CPUs from priv_ver changes: $ ./build/qemu-system-riscv64 -M virt -cpu sifive-e51,priv_spec="v1.12.0" qemu-system-riscv64: can't apply global sifive-e51-riscv-cpu.priv_spec=v1.12.0: CPU 'sifive-e51' does not allow changing the value of 'priv_spec' Current 'priv_spec' val: v1.10.0 $ Signed-off-by: Daniel Henrique Barboza --- target/riscv/cpu.c | 72 +++++++++++++++++++++++++++++++++++++- target/riscv/cpu.h | 3 ++ target/riscv/cpu_cfg.h | 1 - target/riscv/tcg/tcg-cpu.c | 29 --------------- 4 files changed, 74 insertions(+), 31 deletions(-) diff --git a/target/riscv/cpu.c b/target/riscv/cpu.c index cd20489f1b..4e1813eca7 100644 --- a/target/riscv/cpu.c +++ b/target/riscv/cpu.c @@ -1560,8 +1560,76 @@ const PropertyInfo prop_pmp = { .set = prop_pmp_set, }; +static int priv_spec_from_str(const char *priv_spec_str) +{ + int priv_version = -1; + + if (!g_strcmp0(priv_spec_str, PRIV_VER_1_12_0_STR)) { + priv_version = PRIV_VERSION_1_12_0; + } else if (!g_strcmp0(priv_spec_str, PRIV_VER_1_11_0_STR)) { + priv_version = PRIV_VERSION_1_11_0; + } else if (!g_strcmp0(priv_spec_str, PRIV_VER_1_10_0_STR)) { + priv_version = PRIV_VERSION_1_10_0; + } + + return priv_version; +} + +static const char *priv_spec_to_str(int priv_version) +{ + switch (priv_version) { + case PRIV_VERSION_1_10_0: + return PRIV_VER_1_10_0_STR; + case PRIV_VERSION_1_11_0: + return PRIV_VER_1_11_0_STR; + case PRIV_VERSION_1_12_0: + return PRIV_VER_1_12_0_STR; + default: + return NULL; + } +} + +static void prop_priv_spec_set(Object *obj, Visitor *v, const char *name, + void *opaque, Error **errp) +{ + RISCVCPU *cpu = RISCV_CPU(obj); + g_autofree char *value = NULL; + int priv_version = -1; + + visit_type_str(v, name, &value, errp); + + priv_version = priv_spec_from_str(value); + if (priv_version < 0) { + error_setg(errp, "Unsupported privilege spec version '%s'", value); + return; + } + + if (priv_version != cpu->env.priv_ver && riscv_cpu_is_vendor(obj)) { + cpu_set_prop_err(cpu, name, errp); + error_append_hint(errp, "Current '%s' val: %s\n", name, + object_property_get_str(obj, name, NULL)); + return; + } + + cpu->env.priv_ver = priv_version; +} + +static void prop_priv_spec_get(Object *obj, Visitor *v, const char *name, + void *opaque, Error **errp) +{ + RISCVCPU *cpu = RISCV_CPU(obj); + const char *value = priv_spec_to_str(cpu->env.priv_ver); + + visit_type_str(v, name, (char **)&value, errp); +} + +const PropertyInfo prop_priv_spec = { + .name = "priv_spec", + .get = prop_priv_spec_get, + .set = prop_priv_spec_set, +}; + Property riscv_cpu_options[] = { - DEFINE_PROP_STRING("priv_spec", RISCVCPU, cfg.priv_spec), DEFINE_PROP_STRING("vext_spec", RISCVCPU, cfg.vext_spec), DEFINE_PROP_UINT16("vlen", RISCVCPU, cfg.vlen, 128), @@ -1583,6 +1651,8 @@ static Property riscv_cpu_properties[] = { {.name = "mmu", .info = &prop_mmu}, {.name = "pmp", .info = &prop_pmp}, + {.name = "priv_spec", .info = &prop_priv_spec}, + #ifndef CONFIG_USER_ONLY DEFINE_PROP_UINT64("resetvec", RISCVCPU, env.resetvec, DEFAULT_RSTVEC), #endif diff --git a/target/riscv/cpu.h b/target/riscv/cpu.h index cfe965e512..e8a691ca63 100644 --- a/target/riscv/cpu.h +++ b/target/riscv/cpu.h @@ -77,6 +77,9 @@ const char *riscv_get_misa_ext_description(uint32_t bit); #define CPU_CFG_OFFSET(_prop) offsetof(struct RISCVCPUConfig, _prop) /* Privileged specification version */ +#define PRIV_VER_1_10_0_STR "v1.10.0" +#define PRIV_VER_1_11_0_STR "v1.11.0" +#define PRIV_VER_1_12_0_STR "v1.12.0" enum { PRIV_VERSION_1_10_0 = 0, PRIV_VERSION_1_11_0, diff --git a/target/riscv/cpu_cfg.h b/target/riscv/cpu_cfg.h index c67a8731d3..2dba1f0007 100644 --- a/target/riscv/cpu_cfg.h +++ b/target/riscv/cpu_cfg.h @@ -135,7 +135,6 @@ struct RISCVCPUConfig { bool ext_XVentanaCondOps; uint32_t pmu_mask; - char *priv_spec; char *vext_spec; uint16_t vlen; uint16_t elen; diff --git a/target/riscv/tcg/tcg-cpu.c b/target/riscv/tcg/tcg-cpu.c index a09300e908..4d67b72d9e 100644 --- a/target/riscv/tcg/tcg-cpu.c +++ b/target/riscv/tcg/tcg-cpu.c @@ -175,29 +175,6 @@ static void riscv_cpu_validate_misa_mxl(RISCVCPU *cpu, Error **errp) } } -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_validate_v(CPURISCVState *env, RISCVCPUConfig *cfg, Error **errp) { @@ -625,12 +602,6 @@ void riscv_tcg_cpu_finalize_features(RISCVCPU *cpu, Error **errp) CPURISCVState *env = &cpu->env; Error *local_err = NULL; - 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); if (local_err != NULL) { error_propagate(errp, local_err);