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Wed, 09 Nov 2022 11:05:49 +0000 Received: from hirez.programming.kicks-ass.net (hirez.programming.kicks-ass.net [192.168.1.225]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (Client did not present a certificate) by noisy.programming.kicks-ass.net (Postfix) with ESMTPS id 45D4930036B; Wed, 9 Nov 2022 12:05:41 +0100 (CET) Received: by hirez.programming.kicks-ass.net (Postfix, from userid 1000) id F01AE20264769; Wed, 9 Nov 2022 12:05:40 +0100 (CET) Date: Wed, 9 Nov 2022 12:05:40 +0100 From: Peter Zijlstra To: Christoph Hellwig Cc: Aaron Lu , Mike Rapoport , Song Liu , bpf@vger.kernel.org, linux-mm@kvack.org, akpm@linux-foundation.org, x86@kernel.org, rick.p.edgecombe@intel.com, mcgrof@kernel.org Subject: Re: [PATCH bpf-next v2 0/5] execmem_alloc for BPF programs Message-ID: References: <20221107223921.3451913-1-song@kernel.org> <20221109065512.GA11254@lst.de> MIME-Version: 1.0 Content-Type: text/plain; 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d=hostedemail.com; t=1667992028; a=rsa-sha256; cv=none; b=7O7At3J7DkNK7Jei94zWlRz9Oc8Q+oer+IAdsuf2Disp8YrmIVTw5LrPh2NMJCq5P96jLW 4EBXl7uaT+G4foEzaB+3Uq2tK6ipCz5aNGhD7Iq1b7NYRCjhCa3UijkXWlQUn17UQDuvyy GLnOBRY/3sFnZssZtSDcUinKXfPUXAg= X-Rspamd-Queue-Id: 0A1CAC001A X-Rspam-User: X-Rspamd-Server: rspam08 Authentication-Results: imf28.hostedemail.com; dkim=temperror ("DNS error when getting key") header.d=infradead.org header.s=casper.20170209 header.b=XQUqPUgF; spf=temperror (imf28.hostedemail.com: error in processing during lookup of peterz@infradead.org: DNS error) smtp.mailfrom=peterz@infradead.org; dmarc=none X-Stat-Signature: tc984xdopgrf9n5f6tnwe7feocnz5zyz X-HE-Tag: 1667992019-440423 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Wed, Nov 09, 2022 at 07:55:12AM +0100, Christoph Hellwig wrote: > On Tue, Nov 08, 2022 at 08:38:32PM +0800, Aaron Lu wrote: > > set_memory_nx/x() on a vmalloced range will not affect direct map but > > set_memory_ro/rw() will. > > Which seems a little odd. Is there any good reason to not also propagate > the NX bit? Less executable ranges more better. That is, the direct map is *always* NX.