From patchwork Mon Mar 17 17:06:16 2025 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: =?utf-8?b?Q2zDqW1lbnQgTMOpZ2Vy?= X-Patchwork-Id: 14019736 Received: from mail-wr1-f47.google.com (mail-wr1-f47.google.com [209.85.221.47]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id C371D1EDA0C for ; Mon, 17 Mar 2025 17:08:19 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.221.47 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1742231302; cv=none; b=ut/z/N69NNu6zOTGFy1lEvpV09GSGgrJ2BTVmkRnZCSYNRHqdC1FUHyqdHpqGY7QGhhPuCl6H69OE8sTkpuUbjeVzyZZsHBzudd2fVZBC1jMbdXO6Vd0mS1ip73Y3XJjaufZoToJsqpeEhWCPiz43KR2JIVCam4YTR2Q64eYvIg= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1742231302; c=relaxed/simple; bh=B4l5ww4xM3ybuxVDnFD7O4s6SCugiqPi0tOYv0B/adg=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=qlM8F0bPuncy9N0olSAG/WduGHyiO4uj6Uyz5mrnHccNmNmEs4/LwKvQ3E2Hb2iqvn2QBcI1SQrSP9RL5c01AWcfUEhAEYg6ZFlMRQlrkp984tgqCvueM6T/ZdVX5tQ3ptgXZlI5mRcRYzAfs2LBggI/RmM3y1BfNgd8pC9KAyo= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=rivosinc.com; spf=pass smtp.mailfrom=rivosinc.com; dkim=pass (2048-bit key) header.d=rivosinc-com.20230601.gappssmtp.com header.i=@rivosinc-com.20230601.gappssmtp.com header.b=TH0Wpr6k; arc=none smtp.client-ip=209.85.221.47 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=rivosinc.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=rivosinc.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=rivosinc-com.20230601.gappssmtp.com header.i=@rivosinc-com.20230601.gappssmtp.com header.b="TH0Wpr6k" Received: by mail-wr1-f47.google.com with SMTP id ffacd0b85a97d-39133f709f5so2861546f8f.0 for ; Mon, 17 Mar 2025 10:08:19 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=rivosinc-com.20230601.gappssmtp.com; s=20230601; t=1742231298; x=1742836098; darn=vger.kernel.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=z9Vwlc46bZsQyt2QxW9m2l1M9vTOam7Mm6HyDDfLEZk=; b=TH0Wpr6kUlHO8JCQ8f1xc1hUwdTwBLerRFQ1twh7EsTet8H64iJxR7jlfxf4PtwVsk VXRN09JsGKDl7bY4vCW0Ht2UFXJ1kdeHbPrjlSVA3Eho+hcUH1ZUF9cUDYufFnkKkWbb f4ETFjelcXuCl7cyxhkKFvNpn4547+fOHY9Rrso8D78/OUSgoe3wKWtPwfYxqSA+ma9d xPemuYDNAL9vwUieKeknaKYh85TIPPhPeNbNeII+DXeoIiPQ2NGhnzSf4n6rb42h+ICU /5BZuHy9st5KLNxj/lERhDOCDRtPCd0+D+MqaLN3MhM0rVeQyU+XrA80YfffflQxVQA4 swUQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1742231298; x=1742836098; 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=z9Vwlc46bZsQyt2QxW9m2l1M9vTOam7Mm6HyDDfLEZk=; b=lyYjCfwNJzKzaYuz1iQe4sg5et5AcZZkLR2ndR00qg35q6ztkNAPlrz97VQdR0k1RW h0ab/U7zVuVKiuOLQYEibbxdUjW7tpbPNfw86MwPjWkFNoCLAHwYQJWguSWXYJ0IXgiW Ghbkbni8E97oC6ORXw0W3WK5XLrJkUuXjvGpDbOHJGgT080hFjlvUlwkKURVyWmFw+C4 e6yFCe6oramLmAPv9MiaQOPfkRZ3RuAwHzTiBSdGzcUQ5lNAOkYb94bt1LgPYK/XJPCV 5Yn9sGsuoWBRjtrbu++NDGQlpCJYtKukh4Xzk29fHJVys8J79R4NJZZu0Z9zHnM/RIcI V9Dw== X-Forwarded-Encrypted: i=1; AJvYcCXhsfFFqh33s0MIkC/0eAi78Btvcn8I85yaJeDydX66RjvYo1RrxBE4wBFGO8Tho8gbDpk=@vger.kernel.org X-Gm-Message-State: AOJu0YwEqGB6N80tDOLcdVPkUmnnVGxCw+TXzdjjKLetKXnWUIzHWx8A nZBliT87FoCiJl4da/yEzc1o5XC4h0l9rNbaBq8GZSRvwIcdQMitYsYx3JzYh50= X-Gm-Gg: ASbGnctEHpJbvzz1qVK3jpbFaga5+mlZMI20f13DatCTTR8arkWOQ8GM3pM3jE+BGMC Yx7qk+EkaNqP1FqUUeMClUAFuR0DOjDpgu2lnZeFLUhyUXaG62fZzfqEAwlgKv0bI4pdFfs7HS7 tbq66nYdbY9jOx1VMYczNr1pC3PdThRieWhMDIgHiTOt8Qawq3h4dr9+XhR74phs8S2xux669Hv xcyfl1298DvbHUcTj673AEq2oeNwWd60Cce/vLYmlHqtlGxlMWJ37DOdFamEhsyKPCZRmw1kpTK BdGjF2EyfGL+LWfCjyGoe8xHnCHDrJSQomGs/0sXFTzyBw== X-Google-Smtp-Source: AGHT+IGA2Rdk6jf2tb4X7esu4pon4fXkJaTK84F8Y0BwgA61Xp90vVw97TtNBjS5pxzMobEPki6sdQ== X-Received: by 2002:a05:6000:1f8e:b0:391:253b:4046 with SMTP id ffacd0b85a97d-3971d51f3f8mr14939898f8f.16.1742231298143; Mon, 17 Mar 2025 10:08:18 -0700 (PDT) Received: from carbon-x1.. ([2a01:e0a:e17:9700:16d2:7456:6634:9626]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-43d23cddb2asm96014505e9.39.2025.03.17.10.08.16 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 17 Mar 2025 10:08:17 -0700 (PDT) From: =?utf-8?b?Q2zDqW1lbnQgTMOpZ2Vy?= To: Paul Walmsley , Palmer Dabbelt , Anup Patel , Atish Patra , Shuah Khan , Jonathan Corbet , linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org, kvm@vger.kernel.org, kvm-riscv@lists.infradead.org, linux-kselftest@vger.kernel.org Cc: =?utf-8?b?Q2zDqW1lbnQgTMOpZ2Vy?= , Samuel Holland , Andrew Jones Subject: [PATCH v4 10/18] riscv: misaligned: factorize trap handling Date: Mon, 17 Mar 2025 18:06:16 +0100 Message-ID: <20250317170625.1142870-11-cleger@rivosinc.com> X-Mailer: git-send-email 2.47.2 In-Reply-To: <20250317170625.1142870-1-cleger@rivosinc.com> References: <20250317170625.1142870-1-cleger@rivosinc.com> Precedence: bulk X-Mailing-List: kvm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 misaligned accesses traps are not nmi and should be treated as normal one using irqentry_enter()/exit(). Since both load/store and user/kernel should use almost the same path and that we are going to add some code around that, factorize it. Signed-off-by: Clément Léger --- arch/riscv/kernel/traps.c | 49 ++++++++++++++++----------------------- 1 file changed, 20 insertions(+), 29 deletions(-) diff --git a/arch/riscv/kernel/traps.c b/arch/riscv/kernel/traps.c index 8ff8e8b36524..55d9f3450398 100644 --- a/arch/riscv/kernel/traps.c +++ b/arch/riscv/kernel/traps.c @@ -198,47 +198,38 @@ asmlinkage __visible __trap_section void do_trap_insn_illegal(struct pt_regs *re DO_ERROR_INFO(do_trap_load_fault, SIGSEGV, SEGV_ACCERR, "load access fault"); -asmlinkage __visible __trap_section void do_trap_load_misaligned(struct pt_regs *regs) +enum misaligned_access_type { + MISALIGNED_STORE, + MISALIGNED_LOAD, +}; + +static void do_trap_misaligned(struct pt_regs *regs, enum misaligned_access_type type) { - if (user_mode(regs)) { - irqentry_enter_from_user_mode(regs); + irqentry_state_t state = irqentry_enter(regs); + if (type == MISALIGNED_LOAD) { if (handle_misaligned_load(regs)) do_trap_error(regs, SIGBUS, BUS_ADRALN, regs->epc, - "Oops - load address misaligned"); - - irqentry_exit_to_user_mode(regs); + "Oops - load address misaligned"); } else { - irqentry_state_t state = irqentry_nmi_enter(regs); - - if (handle_misaligned_load(regs)) + if (handle_misaligned_store(regs)) do_trap_error(regs, SIGBUS, BUS_ADRALN, regs->epc, - "Oops - load address misaligned"); - - irqentry_nmi_exit(regs, state); + "Oops - store (or AMO) address misaligned"); } + + irqentry_exit(regs, state); } -asmlinkage __visible __trap_section void do_trap_store_misaligned(struct pt_regs *regs) +asmlinkage __visible __trap_section void do_trap_load_misaligned(struct pt_regs *regs) { - if (user_mode(regs)) { - irqentry_enter_from_user_mode(regs); - - if (handle_misaligned_store(regs)) - do_trap_error(regs, SIGBUS, BUS_ADRALN, regs->epc, - "Oops - store (or AMO) address misaligned"); - - irqentry_exit_to_user_mode(regs); - } else { - irqentry_state_t state = irqentry_nmi_enter(regs); - - if (handle_misaligned_store(regs)) - do_trap_error(regs, SIGBUS, BUS_ADRALN, regs->epc, - "Oops - store (or AMO) address misaligned"); + do_trap_misaligned(regs, MISALIGNED_LOAD); +} - irqentry_nmi_exit(regs, state); - } +asmlinkage __visible __trap_section void do_trap_store_misaligned(struct pt_regs *regs) +{ + do_trap_misaligned(regs, MISALIGNED_STORE); } + DO_ERROR_INFO(do_trap_store_fault, SIGSEGV, SEGV_ACCERR, "store (or AMO) access fault"); DO_ERROR_INFO(do_trap_ecall_s,