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Howlett" , Luis Chamberlain , Mark Rutland , Masami Hiramatsu , Matt Turner , Max Filippov , Michael Ellerman , Michal Simek , Oleg Nesterov , Palmer Dabbelt , Peter Zijlstra , Richard Weinberger , Russell King , Song Liu , Stafford Horne , Steven Rostedt , Thomas Bogendoerfer , Thomas Gleixner , Uladzislau Rezki , Vineet Gupta , Will Deacon , bpf@vger.kernel.org, linux-alpha@vger.kernel.org, linux-arch@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-csky@vger.kernel.org, linux-hexagon@vger.kernel.org, linux-kernel@vger.kernel.org, linux-m68k@lists.linux-m68k.org, linux-mips@vger.kernel.org, linux-mm@kvack.org, linux-modules@vger.kernel.org, linux-openrisc@vger.kernel.org, linux-parisc@vger.kernel.org, linux-riscv@lists.infradead.org, linux-sh@vger.kernel.org, linux-snps-arc@lists.infradead.org, linux-trace-kernel@vger.kernel.org, linux-um@lists.infradead.org, linuxppc-dev@lists.ozlabs.org, loongarch@lists.linux.dev, sparclinux@vger.kernel.org, x86@kernel.org Subject: Re: [PATCH v5 7/8] execmem: add support for cache of large ROX pages Message-ID: References: <20241009180816.83591-1-rppt@kernel.org> <20241009180816.83591-8-rppt@kernel.org> X-Mailing-List: linuxppc-dev@lists.ozlabs.org List-Id: List-Help: List-Post: List-Subscribe: , , List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-SRS-Rewrite: SMTP reverse-path rewritten from by bombadil.infradead.org. See http://www.infradead.org/rpr.html On Thu, Oct 10, 2024 at 03:57:33PM +0300, Mike Rapoport wrote: > On Wed, Oct 09, 2024 at 11:58:33PM -0700, Christoph Hellwig wrote: > > On Wed, Oct 09, 2024 at 09:08:15PM +0300, Mike Rapoport wrote: > > > /** > > > * struct execmem_info - architecture parameters for code allocations > > > + * @fill_trapping_insns: set memory to contain instructions that will trap > > > * @ranges: array of parameter sets defining architecture specific > > > * parameters for executable memory allocations. The ranges that are not > > > * explicitly initialized by an architecture use parameters defined for > > > * @EXECMEM_DEFAULT. > > > */ > > > struct execmem_info { > > > + void (*fill_trapping_insns)(void *ptr, size_t size, bool writable); > > > struct execmem_range ranges[EXECMEM_TYPE_MAX]; > > > > Why is the filler an indirect function call and not an architecture > > hook? > > The idea is to keep everything together and have execmem_info describe all > that architecture needs. But why? That's pretty different from our normal style of arch hooks, and introduces an indirect call in a security sensitive area.