From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 9651513C9CB; Fri, 19 Apr 2024 20:00:42 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1713556842; cv=none; b=SE3wbmV8qDwQjD/+g32s18FwXpNNAg5Ib0NchlqfXCnmEXss6Cs3CiXoNHbFRyKXK+domDfSOGJ7j5ykMKrX8r+i5mrl7Y6gfD/EnC28zLh5+A/TvgaSxsQXm0ZaPnR0Yjc4kI0/84iN3OASp9gZWIuq5AJbekUxLqLPxpsF8qw= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1713556842; c=relaxed/simple; bh=1irIlRUcjlhAgXQYQkJd/oGHdCUHLQFxqqgY1XfLhP4=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=rpQ5GM0/X29Fn+zEyr17iQ0OjGTs8i2rF3WHCXqGpT98PL8igV4sIjBIBCngaK3AtR8lA8RQJXMxqa7GFcyuW1PX1kdBIuIMpi3/3z+hlG9Kz+BzjTClkm52stIqCZ44Qa4JkQY1Ea0y9lZljmporMsntjtjEbYAILm/NXe3dJQ= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=hePROBT+; arc=none 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="hePROBT+" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 36E93C116B1; Fri, 19 Apr 2024 20:00:29 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1713556842; bh=1irIlRUcjlhAgXQYQkJd/oGHdCUHLQFxqqgY1XfLhP4=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=hePROBT+glizGF2HhWjQfOISipAvaDLeIwoPfB6eB/130EUaYxI8C9JiOZ0p4IuPP wJr3uvJ18Qdtvzvp+1EN21A1wIYXV57CwgYBWxwwSTpuZVC3Y+zaCK4bAzWjqyz19x of4ezj0xR0KrcZGKrma2TwE1tPaK9aqfe2f5ZULEd8dNouln7cfqCdOX1Qzu+4TMk8 WLbPp6C0rIz8BNuB+lG6UD/vpJZsyvT1zRcqUNkcRP+vw16ocKGnhDqx8/KxOoGcQD fvWWbiJ1tqrYnX18IQfVwbrFy6dcbjd61pDUGP6pZkbtq0sqUsgCyvD6UjOkfp09sG phC1jK7//sNkA== Date: Fri, 19 Apr 2024 22:59:22 +0300 From: Mike Rapoport To: Song Liu Cc: Mark Rutland , Peter Zijlstra , linux-kernel@vger.kernel.org, Alexandre Ghiti , Andrew Morton , Bjorn Topel , Catalin Marinas , Christophe Leroy , "David S. Miller" , Dinh Nguyen , Donald Dutile , Eric Chanudet , Heiko Carstens , Helge Deller , Huacai Chen , Kent Overstreet , Luis Chamberlain , Michael Ellerman , Nadav Amit , Palmer Dabbelt , Puranjay Mohan , Rick Edgecombe , Russell King , Steven Rostedt , Thomas Bogendoerfer , Thomas Gleixner , Will Deacon , bpf@vger.kernel.org, linux-arch@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-mips@vger.kernel.org, linux-mm@kvack.org, linux-modules@vger.kernel.org, linux-parisc@vger.kernel.org, linux-riscv@lists.infradead.org, linux-s390@vger.kernel.org, linux-trace-kernel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, loongarch@lists.linux.dev, netdev@vger.kernel.org, sparclinux@vger.kernel.org, x86@kernel.org Subject: Re: [PATCH v4 05/15] mm: introduce execmem_alloc() and execmem_free() Message-ID: References: Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: On Fri, Apr 19, 2024 at 10:32:39AM -0700, Song Liu wrote: > On Fri, Apr 19, 2024 at 10:03 AM Mike Rapoport wrote: > [...] > > > > > > > > [1] https://lore.kernel.org/all/20240411160526.2093408-1-rppt@kernel.org > > > > > > For the ROX to work, we need different users (module text, kprobe, etc.) to have > > > the same execmem_range. From [1]: > > > > > > static void *execmem_cache_alloc(struct execmem_range *range, size_t size) > > > { > > > ... > > > p = __execmem_cache_alloc(size); > > > if (p) > > > return p; > > > err = execmem_cache_populate(range, size); > > > ... > > > } > > > > > > We are calling __execmem_cache_alloc() without range. For this to work, > > > we can only call execmem_cache_alloc() with one execmem_range. > > > > Actually, on x86 this will "just work" because everything shares the same > > address space :) > > > > The 2M pages in the cache will be in the modules space, so > > __execmem_cache_alloc() will always return memory from that address space. > > > > For other architectures this indeed needs to be fixed with passing the > > range to __execmem_cache_alloc() and limiting search in the cache for that > > range. > > I think we at least need the "map to" concept (initially proposed by Thomas) > to get this work. For example, EXECMEM_BPF and EXECMEM_KPROBE > maps to EXECMEM_MODULE_TEXT, so that all these actually share > the same range. Why? > Does this make sense? > > Song -- Sincerely yours, Mike. From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 5CA94C04FF6 for ; Fri, 19 Apr 2024 20:00:57 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:In-Reply-To:MIME-Version:References: Message-ID:Subject:Cc:To:From:Date:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=iN2pY4dLIFN9wBvQTjXnonupJU0G8HDdf0EkiVfFcVg=; b=ZbjPww9Qo6L0R4 NmdYTPk6VkHw44gbOZkAk/F8yJwUXBGcOFPpd+zRD8H8o9+9EKm2Ltc62I+vWoQMO82oV0B+qZXIV xwTCjVKZCT1y0ZpyQswkiQWq1EeFpUlpJlVNby/g/Rh+NcI5Jo7xU5UvgHUs3WC4eGVf4o2sfNnUX sBc8rFtzQTepNvE+fv+om3w4/FYwnOWjfgt8ML8F4aRLXyMSfkPb0kiYj12HYRVb1OyLVdMUMcFt7 EgPVsSncazKPdHb6gliodoXwKDGspKOboEMuGRLYc6Gu8tduuQvRoXtXHsem3raJT4drjO+BeJuIg UxMjoWliQjsJGBkW79rA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.97.1 #2 (Red Hat Linux)) id 1rxuPg-00000006qjv-2nE2; Fri, 19 Apr 2024 20:00:48 +0000 Received: from dfw.source.kernel.org ([2604:1380:4641:c500::1]) by bombadil.infradead.org with esmtps (Exim 4.97.1 #2 (Red Hat Linux)) id 1rxuPc-00000006qgh-0YMW; Fri, 19 Apr 2024 20:00:47 +0000 Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by dfw.source.kernel.org (Postfix) with ESMTP id 815A661A8B; Fri, 19 Apr 2024 20:00:42 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 36E93C116B1; Fri, 19 Apr 2024 20:00:29 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1713556842; bh=1irIlRUcjlhAgXQYQkJd/oGHdCUHLQFxqqgY1XfLhP4=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=hePROBT+glizGF2HhWjQfOISipAvaDLeIwoPfB6eB/130EUaYxI8C9JiOZ0p4IuPP wJr3uvJ18Qdtvzvp+1EN21A1wIYXV57CwgYBWxwwSTpuZVC3Y+zaCK4bAzWjqyz19x of4ezj0xR0KrcZGKrma2TwE1tPaK9aqfe2f5ZULEd8dNouln7cfqCdOX1Qzu+4TMk8 WLbPp6C0rIz8BNuB+lG6UD/vpJZsyvT1zRcqUNkcRP+vw16ocKGnhDqx8/KxOoGcQD fvWWbiJ1tqrYnX18IQfVwbrFy6dcbjd61pDUGP6pZkbtq0sqUsgCyvD6UjOkfp09sG phC1jK7//sNkA== Date: Fri, 19 Apr 2024 22:59:22 +0300 From: Mike Rapoport To: Song Liu Cc: Mark Rutland , Peter Zijlstra , linux-kernel@vger.kernel.org, Alexandre Ghiti , Andrew Morton , Bjorn Topel , Catalin Marinas , Christophe Leroy , "David S. Miller" , Dinh Nguyen , Donald Dutile , Eric Chanudet , Heiko Carstens , Helge Deller , Huacai Chen , Kent Overstreet , Luis Chamberlain , Michael Ellerman , Nadav Amit , Palmer Dabbelt , Puranjay Mohan , Rick Edgecombe , Russell King , Steven Rostedt , Thomas Bogendoerfer , Thomas Gleixner , Will Deacon , bpf@vger.kernel.org, linux-arch@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-mips@vger.kernel.org, linux-mm@kvack.org, linux-modules@vger.kernel.org, linux-parisc@vger.kernel.org, linux-riscv@lists.infradead.org, linux-s390@vger.kernel.org, linux-trace-kernel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, loongarch@lists.linux.dev, netdev@vger.kernel.org, sparclinux@vger.kernel.org, x86@kernel.org Subject: Re: [PATCH v4 05/15] mm: introduce execmem_alloc() and execmem_free() Message-ID: References: MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20240419_130044_321984_6C4501E2 X-CRM114-Status: GOOD ( 21.76 ) 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; 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Fri, 19 Apr 2024 20:00:48 +0000 Received: from dfw.source.kernel.org ([2604:1380:4641:c500::1]) by bombadil.infradead.org with esmtps (Exim 4.97.1 #2 (Red Hat Linux)) id 1rxuPc-00000006qgh-0YMW; Fri, 19 Apr 2024 20:00:47 +0000 Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by dfw.source.kernel.org (Postfix) with ESMTP id 815A661A8B; Fri, 19 Apr 2024 20:00:42 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 36E93C116B1; Fri, 19 Apr 2024 20:00:29 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1713556842; bh=1irIlRUcjlhAgXQYQkJd/oGHdCUHLQFxqqgY1XfLhP4=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=hePROBT+glizGF2HhWjQfOISipAvaDLeIwoPfB6eB/130EUaYxI8C9JiOZ0p4IuPP wJr3uvJ18Qdtvzvp+1EN21A1wIYXV57CwgYBWxwwSTpuZVC3Y+zaCK4bAzWjqyz19x of4ezj0xR0KrcZGKrma2TwE1tPaK9aqfe2f5ZULEd8dNouln7cfqCdOX1Qzu+4TMk8 WLbPp6C0rIz8BNuB+lG6UD/vpJZsyvT1zRcqUNkcRP+vw16ocKGnhDqx8/KxOoGcQD fvWWbiJ1tqrYnX18IQfVwbrFy6dcbjd61pDUGP6pZkbtq0sqUsgCyvD6UjOkfp09sG phC1jK7//sNkA== Date: Fri, 19 Apr 2024 22:59:22 +0300 From: Mike Rapoport To: Song Liu Cc: Mark Rutland , Peter Zijlstra , linux-kernel@vger.kernel.org, Alexandre Ghiti , Andrew Morton , Bjorn Topel , Catalin Marinas , Christophe Leroy , "David S. Miller" , Dinh Nguyen , Donald Dutile , Eric Chanudet , Heiko Carstens , Helge Deller , Huacai Chen , Kent Overstreet , Luis Chamberlain , Michael Ellerman , Nadav Amit , Palmer Dabbelt , Puranjay Mohan , Rick Edgecombe , Russell King , Steven Rostedt , Thomas Bogendoerfer , Thomas Gleixner , Will Deacon , bpf@vger.kernel.org, linux-arch@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-mips@vger.kernel.org, linux-mm@kvack.org, linux-modules@vger.kernel.org, linux-parisc@vger.kernel.org, linux-riscv@lists.infradead.org, linux-s390@vger.kernel.org, linux-trace-kernel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, loongarch@lists.linux.dev, netdev@vger.kernel.org, sparclinux@vger.kernel.org, x86@kernel.org Subject: Re: [PATCH v4 05/15] mm: introduce execmem_alloc() and execmem_free() Message-ID: References: MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20240419_130044_321984_6C4501E2 X-CRM114-Status: GOOD ( 21.76 ) X-BeenThere: linux-arm-kernel@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-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org T24gRnJpLCBBcHIgMTksIDIwMjQgYXQgMTA6MzI6MzlBTSAtMDcwMCwgU29uZyBMaXUgd3JvdGU6 Cj4gT24gRnJpLCBBcHIgMTksIDIwMjQgYXQgMTA6MDPigK9BTSBNaWtlIFJhcG9wb3J0IDxycHB0 QGtlcm5lbC5vcmc+IHdyb3RlOgo+IFsuLi5dCj4gPiA+ID4KPiA+ID4gPiBbMV0gaHR0cHM6Ly9s b3JlLmtlcm5lbC5vcmcvYWxsLzIwMjQwNDExMTYwNTI2LjIwOTM0MDgtMS1ycHB0QGtlcm5lbC5v cmcKPiA+ID4KPiA+ID4gRm9yIHRoZSBST1ggdG8gd29yaywgd2UgbmVlZCBkaWZmZXJlbnQgdXNl cnMgKG1vZHVsZSB0ZXh0LCBrcHJvYmUsIGV0Yy4pIHRvIGhhdmUKPiA+ID4gdGhlIHNhbWUgZXhl Y21lbV9yYW5nZS4gRnJvbSBbMV06Cj4gPiA+Cj4gPiA+IHN0YXRpYyB2b2lkICpleGVjbWVtX2Nh Y2hlX2FsbG9jKHN0cnVjdCBleGVjbWVtX3JhbmdlICpyYW5nZSwgc2l6ZV90IHNpemUpCj4gPiA+ IHsKPiA+ID4gLi4uCj4gPiA+ICAgICAgICBwID0gX19leGVjbWVtX2NhY2hlX2FsbG9jKHNpemUp Owo+ID4gPiAgICAgICAgaWYgKHApCj4gPiA+ICAgICAgICAgICAgICAgIHJldHVybiBwOwo+ID4g PiAgICAgICBlcnIgPSBleGVjbWVtX2NhY2hlX3BvcHVsYXRlKHJhbmdlLCBzaXplKTsKPiA+ID4g Li4uCj4gPiA+IH0KPiA+ID4KPiA+ID4gV2UgYXJlIGNhbGxpbmcgX19leGVjbWVtX2NhY2hlX2Fs bG9jKCkgd2l0aG91dCByYW5nZS4gRm9yIHRoaXMgdG8gd29yaywKPiA+ID4gd2UgY2FuIG9ubHkg Y2FsbCBleGVjbWVtX2NhY2hlX2FsbG9jKCkgd2l0aCBvbmUgZXhlY21lbV9yYW5nZS4KPiA+Cj4g PiBBY3R1YWxseSwgb24geDg2IHRoaXMgd2lsbCAianVzdCB3b3JrIiBiZWNhdXNlIGV2ZXJ5dGhp bmcgc2hhcmVzIHRoZSBzYW1lCj4gPiBhZGRyZXNzIHNwYWNlIDopCj4gPgo+ID4gVGhlIDJNIHBh Z2VzIGluIHRoZSBjYWNoZSB3aWxsIGJlIGluIHRoZSBtb2R1bGVzIHNwYWNlLCBzbwo+ID4gX19l eGVjbWVtX2NhY2hlX2FsbG9jKCkgd2lsbCBhbHdheXMgcmV0dXJuIG1lbW9yeSBmcm9tIHRoYXQg YWRkcmVzcyBzcGFjZS4KPiA+Cj4gPiBGb3Igb3RoZXIgYXJjaGl0ZWN0dXJlcyB0aGlzIGluZGVl ZCBuZWVkcyB0byBiZSBmaXhlZCB3aXRoIHBhc3NpbmcgdGhlCj4gPiByYW5nZSB0byBfX2V4ZWNt ZW1fY2FjaGVfYWxsb2MoKSBhbmQgbGltaXRpbmcgc2VhcmNoIGluIHRoZSBjYWNoZSBmb3IgdGhh dAo+ID4gcmFuZ2UuCj4gCj4gSSB0aGluayB3ZSBhdCBsZWFzdCBuZWVkIHRoZSAibWFwIHRvIiBj b25jZXB0IChpbml0aWFsbHkgcHJvcG9zZWQgYnkgVGhvbWFzKQo+IHRvIGdldCB0aGlzIHdvcmsu IEZvciBleGFtcGxlLCBFWEVDTUVNX0JQRiBhbmQgRVhFQ01FTV9LUFJPQkUKPiBtYXBzIHRvIEVY RUNNRU1fTU9EVUxFX1RFWFQsIHNvIHRoYXQgYWxsIHRoZXNlIGFjdHVhbGx5IHNoYXJlCj4gdGhl IHNhbWUgcmFuZ2UuCgpXaHk/CiAKPiBEb2VzIHRoaXMgbWFrZSBzZW5zZT8KPiAKPiBTb25nCgot LSAKU2luY2VyZWx5IHlvdXJzLApNaWtlLgoKX19fX19fX19fX19fX19fX19fX19fX19fX19fX19f X19fX19fX19fX19fX19fX18KbGludXgtYXJtLWtlcm5lbCBtYWlsaW5nIGxpc3QKbGludXgtYXJt LWtlcm5lbEBsaXN0cy5pbmZyYWRlYWQub3JnCmh0dHA6Ly9saXN0cy5pbmZyYWRlYWQub3JnL21h aWxtYW4vbGlzdGluZm8vbGludXgtYXJtLWtlcm5lbAo=