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Mon, 18 Aug 2025 03:29:10 -0700 (PDT) Received: from localhost ([2a02:8308:a00c:e200:faeb:f88c:9e29:5aa1]) by smtp.gmail.com with UTF8SMTPSA id 5b1f17b1804b1-45a2232de40sm125126805e9.26.2025.08.18.03.29.10 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 18 Aug 2025 03:29:10 -0700 (PDT) Mime-Version: 1.0 Date: Mon, 18 Aug 2025 12:29:10 +0200 Message-Id: Subject: Re: [PATCH 0/6] ONE_REG interface for SBI FWFT extension Cc: "Palmer Dabbelt" , "Paul Walmsley" , "Alexandre Ghiti" , "Andrew Jones" , "Anup Patel" , "Paolo Bonzini" , "Shuah Khan" , , , , , , "linux-riscv" To: "Anup Patel" , "Atish Patra" From: =?utf-8?q?Radim_Kr=C4=8Dm=C3=A1=C5=99?= References: <20250814155548.457172-1-apatel@ventanamicro.com> In-Reply-To: <20250814155548.457172-1-apatel@ventanamicro.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20250818_032913_085914_0A12F421 X-CRM114-Status: UNSURE ( 8.24 ) X-CRM114-Notice: Please train this message. X-BeenThere: kvm-riscv@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "kvm-riscv" Errors-To: kvm-riscv-bounces+kvm-riscv=archiver.kernel.org@lists.infradead.org 2025-08-14T21:25:42+05:30, Anup Patel : > This series adds ONE_REG interface for SBI FWFT extension implemented > by KVM RISC-V. I think it would be better to ONE_REG the CSRs (medeleg/menvcfg), or at least expose their CSR fields (each sensible medeleg bit, PMM, ...) through kvm_riscv_config, than to couple this with SBI/FWFT. The controlled behavior is defined by the ISA, and userspace might want to configure the S-mode execution environment even when SBI/FWFT is not present, which is not possible with the current design. Is there a benefit in expressing the ISA model through SBI/FWFT? Thanks. -- kvm-riscv mailing list kvm-riscv@lists.infradead.org http://lists.infradead.org/mailman/listinfo/kvm-riscv From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-wm1-f41.google.com (mail-wm1-f41.google.com [209.85.128.41]) (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 AEFA0258EDC for ; Mon, 18 Aug 2025 10:29:12 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.128.41 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1755512954; cv=none; b=cuE1yAIS/UIjudlHa4D6eqhA6DcZVkRJ2mnOXyJ56Q5Yg2YYpP9PhonaG66LByGJZu23+7xloKuzukZRCM92i4cAWjo3P74oBuqP9nPBu0UlzFEixl1W2T273uwiFFCjygGZ94k0oLyT4h/Ya9YuI8Pifa+3bI5tUAAIygKSF4s= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1755512954; c=relaxed/simple; bh=BhbysUcbAKjEA8/11kFRzX2E12IzlBavWPgZPsKEmYQ=; h=Mime-Version:Content-Type:Date:Message-Id:Subject:Cc:To:From: References:In-Reply-To; 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Mon, 18 Aug 2025 03:29:10 -0700 (PDT) Precedence: bulk X-Mailing-List: kvm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=UTF-8 Date: Mon, 18 Aug 2025 12:29:10 +0200 Message-Id: Subject: Re: [PATCH 0/6] ONE_REG interface for SBI FWFT extension Cc: "Palmer Dabbelt" , "Paul Walmsley" , "Alexandre Ghiti" , "Andrew Jones" , "Anup Patel" , "Paolo Bonzini" , "Shuah Khan" , , , , , , "linux-riscv" To: "Anup Patel" , "Atish Patra" From: =?utf-8?q?Radim_Kr=C4=8Dm=C3=A1=C5=99?= References: <20250814155548.457172-1-apatel@ventanamicro.com> In-Reply-To: <20250814155548.457172-1-apatel@ventanamicro.com> 2025-08-14T21:25:42+05:30, Anup Patel : > This series adds ONE_REG interface for SBI FWFT extension implemented > by KVM RISC-V. I think it would be better to ONE_REG the CSRs (medeleg/menvcfg), or at least expose their CSR fields (each sensible medeleg bit, PMM, ...) through kvm_riscv_config, than to couple this with SBI/FWFT. The controlled behavior is defined by the ISA, and userspace might want to configure the S-mode execution environment even when SBI/FWFT is not present, which is not possible with the current design. Is there a benefit in expressing the ISA model through SBI/FWFT? Thanks. 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Mon, 18 Aug 2025 03:29:10 -0700 (PDT) Received: from localhost ([2a02:8308:a00c:e200:faeb:f88c:9e29:5aa1]) by smtp.gmail.com with UTF8SMTPSA id 5b1f17b1804b1-45a2232de40sm125126805e9.26.2025.08.18.03.29.10 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 18 Aug 2025 03:29:10 -0700 (PDT) Mime-Version: 1.0 Date: Mon, 18 Aug 2025 12:29:10 +0200 Message-Id: Subject: Re: [PATCH 0/6] ONE_REG interface for SBI FWFT extension Cc: "Palmer Dabbelt" , "Paul Walmsley" , "Alexandre Ghiti" , "Andrew Jones" , "Anup Patel" , "Paolo Bonzini" , "Shuah Khan" , , , , , , "linux-riscv" To: "Anup Patel" , "Atish Patra" From: =?utf-8?q?Radim_Kr=C4=8Dm=C3=A1=C5=99?= References: <20250814155548.457172-1-apatel@ventanamicro.com> In-Reply-To: <20250814155548.457172-1-apatel@ventanamicro.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20250818_032913_109441_2AD537A4 X-CRM114-Status: UNSURE ( 8.24 ) X-CRM114-Notice: Please train this message. X-BeenThere: linux-riscv@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-riscv" Errors-To: linux-riscv-bounces+linux-riscv=archiver.kernel.org@lists.infradead.org 2025-08-14T21:25:42+05:30, Anup Patel : > This series adds ONE_REG interface for SBI FWFT extension implemented > by KVM RISC-V. I think it would be better to ONE_REG the CSRs (medeleg/menvcfg), or at least expose their CSR fields (each sensible medeleg bit, PMM, ...) through kvm_riscv_config, than to couple this with SBI/FWFT. The controlled behavior is defined by the ISA, and userspace might want to configure the S-mode execution environment even when SBI/FWFT is not present, which is not possible with the current design. Is there a benefit in expressing the ISA model through SBI/FWFT? Thanks. _______________________________________________ linux-riscv mailing list linux-riscv@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-riscv