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[114.35.142.126]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-269800530b7sm157486245ad.18.2025.09.23.02.07.45 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 23 Sep 2025 02:07:47 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=sifive.com; s=google; t=1758618467; x=1759223267; 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=vvZnoVopgO+vVIobVK5W/azjACmzwY/8WsAkXBWzMOY=; b=nPYLCub83pkFOYgcDMv22CPTOzymanxbNYR3euSE5+IyYiaips9CRJggwnuOIx6I+9 o67Q27votnxgX2IHURYLMfUFvZ76y4IPHcoHd/7xp1/yJWOORcqZGuaGlGwx9fsJDzK9 Zik5RL8KoSA1RI5VI4Tju8UgoHPPbBMFGuTsGmVeUIkU/IpZ8YXrcdzpAsAsjWPGvS0s 0rjwL4p6OrZuuZb7SPFDuVEMiL+dEWDoJtzeQU2fM+BbIOUibtwtPbrDl7NGd7UKfFfY e+oqwqZAmte+4D9VyLpOqVS+IiCsyZXs4QieK9bPFkHqF4uHIUIKpjeVXGkHGP/Xob7W yxSQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1758618467; x=1759223267; 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=vvZnoVopgO+vVIobVK5W/azjACmzwY/8WsAkXBWzMOY=; b=AtsJJrd1UkxgkwtGmkoiOJfSZePVKvWxtPwNOKNlX7UTysnpQZo5ki++fKVYqn9Pka 1FlERhnVXwDegv24WwpT6SJI5vVeziWkbl/KvhCfFr4fQvtCAhVNaZKZjNdAnA0ctVSt ul4XEKPgaKT9lft83ctTBxl6VGETAHtKs3CmL1S/muNJdVQtbRNxojoKYLnQudiPhj+5 4gkT+FyX2qzkUGR2cyuSGGBop1U02fKYXaMCi8o1DDBUW9Oc5tISi6zHmQNlzFzqC9Uo hp8xtMI/E9URTqnmqk9LI3ddUwvHtrnHuesPQDjxxRkYMRw1GRUgTB3/X83Hn40GY05K 7UqQ== X-Gm-Message-State: AOJu0Yw/hGweU8Vwq1q3wouksc3HZ9FLZel2OeOZS2L9qqmtI6+dBmfs pV4atl53UJx9S7HqKatE1T1SFD5w2r7FVhk4ozkb8F7Rdvau6hPCFMY4KOAo7MYg5EKz6TeKLOQ OX2xji6KwT3wY5xumzAACFz1VpzYGQpkvYSqHXlwsdww8Mc4Y2gs28vKIpq/x1j2RzvzyabMadK f5EX0hzg9iaF9aWsab/HC1S60lZ3EN5ZoRFLs3xGNjFA== X-Gm-Gg: ASbGncvNyEYJ7OGVarnsT07p3qdr6bIK70/ZTlmg4YRTSxp9KOknimT949h++3fXTVr 2JxXYX1Gh/kc3CsceQwJR3E1yLQbT8MOqcLu7AH4siDxfdLk0Ro1V8aj2sMTaX7tK6JH3Dd3b19 k+7Ph7OCDxDRnc8F8cj5DTlY/Hq+cF+/8KOCxk/Si2XpXAstRhqJHG3IB8o5Jh9K9fPORG4Cv3P We0VkiYoKe/vDbG+7gb6DGfaiTEKgce/vIdum9PQ56A+XWYGRGB7sBg/JpU5yKQOguHAcgbpBYw whFkRHNyc1vaXLCC/thmwz31neHmm7DUdlxq6t3G4K2qSQx0jwQLFTom0W/9vt0T419uSeov6lR LqjvJp2Rzlj8QM6IocWPeBowV7XsGIIqhlPenviWTK3MUkb6DYqhkMt1SDNu4rvF4Jig= X-Google-Smtp-Source: AGHT+IG+0y2srJ2JYUnN52fG2LoVoYCbwcMfOcRxg+HWUMV0x1Iqgukvc0dqT1IWn4sB9CqDe14KzA== X-Received: by 2002:a17:903:19f0:b0:26a:ac66:ef3f with SMTP id d9443c01a7336-27cc09e378emr21133705ad.8.1758618467437; Tue, 23 Sep 2025 02:07:47 -0700 (PDT) From: Max Chou To: qemu-devel@nongnu.org, qemu-riscv@nongnu.org Cc: Palmer Dabbelt , Alistair Francis , Weiwei Li , Daniel Henrique Barboza , Liu Zhiwei , Max Chou Subject: [PATCH v2 2/2] target/riscv: rvv: Modify minimum VLEN according to enabled vector extensions Date: Tue, 23 Sep 2025 17:07:29 +0800 Message-ID: <20250923090729.1887406-3-max.chou@sifive.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20250923090729.1887406-1-max.chou@sifive.com> References: <20250923090729.1887406-1-max.chou@sifive.com> 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::62b; envelope-from=max.chou@sifive.com; helo=mail-pl1-x62b.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=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 @sifive.com) X-ZM-MESSAGEID: 1758618540018116600 Content-Type: text/plain; charset="utf-8" According to the RISC-V unprivileged specification, the VLEN should be grea= ter or equal to the ELEN. This commit modifies the minimum VLEN based on the ve= ctor extensions and introduces a check rule for VLEN and ELEN. Extension Minimum VLEN * V 128 * Zve64[d|f|x] 64 * Zve32[f|x] 32 Signed-off-by: Max Chou --- target/riscv/tcg/tcg-cpu.c | 19 +++++++++++++++++-- 1 file changed, 17 insertions(+), 2 deletions(-) diff --git a/target/riscv/tcg/tcg-cpu.c b/target/riscv/tcg/tcg-cpu.c index a6f60f55ceb..02d99bb0ae9 100644 --- a/target/riscv/tcg/tcg-cpu.c +++ b/target/riscv/tcg/tcg-cpu.c @@ -416,12 +416,21 @@ static void riscv_cpu_validate_misa_priv(CPURISCVStat= e *env, Error **errp) static void riscv_cpu_validate_v(CPURISCVState *env, RISCVCPUConfig *cfg, Error **errp) { + uint32_t min_vlen; uint32_t vlen =3D cfg->vlenb << 3; =20 - if (vlen > RV_VLEN_MAX || vlen < 128) { + if (riscv_has_ext(env, RVV)) { + min_vlen =3D 128; + } else if (cfg->ext_zve64x) { + min_vlen =3D 64; + } else if (cfg->ext_zve32x) { + min_vlen =3D 32; + } + + if (vlen > RV_VLEN_MAX || vlen < min_vlen) { error_setg(errp, "Vector extension implementation only supports VLEN " - "in the range [128, %d]", RV_VLEN_MAX); + "in the range [%d, %d]", min_vlen, RV_VLEN_MAX); return; } =20 @@ -431,6 +440,12 @@ static void riscv_cpu_validate_v(CPURISCVState *env, R= ISCVCPUConfig *cfg, "in the range [8, 64]"); return; } + + if (vlen < cfg->elen) { + error_setg(errp, "Vector extension implementation requires VLEN " + "to be greater than or equal to ELEN"); + return; + } } =20 static void riscv_cpu_disable_priv_spec_isa_exts(RISCVCPU *cpu) --=20 2.43.0