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Bretelle , Pu Lehui Subject: Re: [PATCH bpf-next 2/5] riscv, bpf: Relax restrictions on Zbb instructions In-Reply-To: <20240329-linguini-uncured-380cb4cff61c@wendy> References: <20240328124916.293173-1-pulehui@huaweicloud.com> <20240328124916.293173-3-pulehui@huaweicloud.com> <3ed9fe94-2610-41eb-8a00-a9f37fcf2b1a@app.fastmail.com> <20240328-ferocity-repose-c554f75a676c@spud> <20240329-linguini-uncured-380cb4cff61c@wendy> Date: Tue, 02 Apr 2024 16:18:02 +0200 Message-ID: <87il0zrgpx.fsf@all.your.base.are.belong.to.us> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20240402_071807_783338_3D4EEDB1 X-CRM114-Status: GOOD ( 30.36 ) 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="utf-8" Content-Transfer-Encoding: base64 Sender: "linux-riscv" Errors-To: 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smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="dfVAw2iR" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 57FA2C433F1; Tue, 2 Apr 2024 14:18:05 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1712067485; bh=JXeMgDJf7NztdBYQwze7zpUZgNxk5FTdMBjGNHLcJyc=; h=From:To:Cc:Subject:In-Reply-To:References:Date:From; b=dfVAw2iRAvypeK/Zlw38Hf7kCcsuNwEhmQfBge96A/7PycL6UubyOuVvmKNRhslrZ oNMfs3i2an13hurYmIouOhXwU0P7YwaKep4CpvN9DQOtyYOXS6BZSwcsdI9SEJ6VzA J5WhBcosWO0m1/FPgwgQ4g5iwFvLaNkajPW7lBdqd+N+nu7hvFWMhPYBJZUM3RJ4KD 9LXtsG9PhmP3zt1699OP/kxI+DGr59xUutBN6wJ6BNEDepT71pRFxMer7JyIZ/6vZh x0xWH8Nlw7f36+WcOiVt+7thgJjsCnDL3yrWnwaFMwUp/OxG3rfLNZe8aYzDY/t9pi LsntEkP/9ghMg== From: =?utf-8?B?QmrDtnJuIFTDtnBlbA==?= To: Conor Dooley , Conor Dooley Cc: Stefan O'Rear , Pu Lehui , bpf@vger.kernel.org, linux-riscv@lists.infradead.org, netdev@vger.kernel.org, Alexei Starovoitov , Daniel Borkmann , Andrii Nakryiko , Martin KaFai Lau , Eduard Zingerman , Song Liu , Yonghong Song , John Fastabend , KP Singh , Stanislav Fomichev , Hao Luo , Jiri Olsa , Mykola Lysenko , Manu Bretelle , Pu Lehui Subject: Re: [PATCH bpf-next 2/5] riscv, bpf: Relax restrictions on Zbb instructions In-Reply-To: <20240329-linguini-uncured-380cb4cff61c@wendy> References: <20240328124916.293173-1-pulehui@huaweicloud.com> <20240328124916.293173-3-pulehui@huaweicloud.com> <3ed9fe94-2610-41eb-8a00-a9f37fcf2b1a@app.fastmail.com> <20240328-ferocity-repose-c554f75a676c@spud> <20240329-linguini-uncured-380cb4cff61c@wendy> Date: Tue, 02 Apr 2024 16:18:02 +0200 Message-ID: <87il0zrgpx.fsf@all.your.base.are.belong.to.us> Precedence: bulk X-Mailing-List: bpf@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Conor Dooley writes: > On Thu, Mar 28, 2024 at 10:07:23PM +0000, Conor Dooley wrote: > >> As I said on IRC to you earlier, I think the Kconfig options here are in >> need of a bit of a spring cleaning - they should be modified to explain >> their individual purposes, be that enabling optimisations in the kernel >> or being required for userspace. I'll try to send a patch for that if >> I remember tomorrow. > > Something like this: > > -- >8 -- > commit 5125504beaedd669b082bf74b02003a77360670f > Author: Conor Dooley > Date: Fri Mar 29 11:13:22 2024 +0000 > > RISC-V: clarify what some RISCV_ISA* config options do >=20=20=20=20=20 > During some discussion on IRC yesterday and on Pu's bpf patch [1] > I noticed that these RISCV_ISA* Kconfig options are not really clear > about their implications. Many of these options have no impact on what > userspace is allowed to do, for example an application can use Zbb > regardless of whether or not the kernel does. Change the help text to > try and clarify whether or not an option affects just the kernel, or > also userspace. None of these options actually control whether or not= an > extension is detected dynamically as that's done regardless of Kconfig > options, so drop any text that implies the option is required for > dynamic detection, rewording them as "do x when y is detected". >=20=20=20=20=20 > Link: https://lore.kernel.org/linux-riscv/20240328-ferocity-repose-c5= 54f75a676c@spud/ [1] > Signed-off-by: Conor Dooley > --- > I did this based on top of Samuel's changes dropping the MMU > requurements just in case, but I don't think there's a conflict: > https://lore.kernel.org/linux-riscv/20240227003630.3634533-4-samuel.h= olland@sifive.com/ > > diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig > index d8a777f59402..f327a8ac648f 100644 > --- a/arch/riscv/Kconfig > +++ b/arch/riscv/Kconfig > @@ -501,8 +501,8 @@ config RISCV_ISA_SVNAPOT > depends on RISCV_ALTERNATIVE > default y > help > - Allow kernel to detect the Svnapot ISA-extension dynamically at boot > - time and enable its usage. > + Add support for the Svnapot ISA-extension when it is detected by > + the kernel at boot. >=20=20 > The Svnapot extension is used to mark contiguous PTEs as a range > of contiguous virtual-to-physical translations for a naturally > @@ -520,9 +520,9 @@ config RISCV_ISA_SVPBMT > depends on RISCV_ALTERNATIVE > default y > help > - Adds support to dynamically detect the presence of the Svpbmt > - ISA-extension (Supervisor-mode: page-based memory types) and > - enable its usage. > + Add support for the Svpbmt ISA-extension (Supervisor-mode: > + page-based memory types) when it is detected by the kernel at > + boot. >=20=20 > The memory type for a page contains a combination of attributes > that indicate the cacheability, idempotency, and ordering > @@ -541,14 +541,15 @@ config TOOLCHAIN_HAS_V > depends on AS_HAS_OPTION_ARCH >=20=20 > config RISCV_ISA_V > - bool "VECTOR extension support" > + bool "Vector extension support" > depends on TOOLCHAIN_HAS_V > depends on FPU > select DYNAMIC_SIGFRAME > default y > help > Say N here if you want to disable all vector related procedure > - in the kernel. > + in the kernel. Without this option enabled, neither the kernel nor > + userspace may use vector. >=20=20 > If you don't know what to do here, say Y. >=20=20 > @@ -606,8 +607,8 @@ config RISCV_ISA_ZBB > depends on RISCV_ALTERNATIVE > default y > help > - Adds support to dynamically detect the presence of the ZBB > - extension (basic bit manipulation) and enable its usage. > + Add support for enabling optimisations in the kernel when the I don't care much, but "optimizations" here -- for consistency reasons! [1] ;-) Nice change! Reviewed-by: Bj=C3=B6rn T=C3=B6pel [1] https://lwn.net/Articles/636286/