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Shutemov" To: Yu-cheng Yu Cc: x86@kernel.org, "H. Peter Anvin" , Thomas Gleixner , Ingo Molnar , linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org, linux-mm@kvack.org, linux-arch@vger.kernel.org, linux-api@vger.kernel.org, Arnd Bergmann , Andy Lutomirski , Balbir Singh , Borislav Petkov , Cyrill Gorcunov , Dave Hansen , Eugene Syromiatnikov , Florian Weimer , "H.J. Lu" , Jann Horn , Jonathan Corbet , Kees Cook , Mike Kravetz , Nadav Amit , Oleg Nesterov , Pavel Machek , Peter Zijlstra , Randy Dunlap , "Ravi V. Shankar" , Vedvyas Shanbhogue , Dave Martin , Weijiang Yang , Pengfei Xu , Haitao Huang , Christoph Hellwig Subject: Re: [PATCH v23 07/28] x86/mm: Remove _PAGE_DIRTY from kernel RO pages Message-ID: <20210322091351.ulemcluuhqkzuwkm@box> References: <20210316151054.5405-1-yu-cheng.yu@intel.com> <20210316151054.5405-8-yu-cheng.yu@intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20210316151054.5405-8-yu-cheng.yu@intel.com> X-Stat-Signature: fpqp5sgzzwz6a33ta3ug6obgcuhrjg8z X-Rspamd-Server: rspam01 X-Rspamd-Queue-Id: C5557407F8DF Received-SPF: none (shutemov.name>: No applicable sender policy available) receiver=imf26; identity=mailfrom; envelope-from=""; helo=mail-lj1-f177.google.com; client-ip=209.85.208.177 X-HE-DKIM-Result: pass/pass X-HE-Tag: 1616404427-516663 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 Tue, Mar 16, 2021 at 08:10:33AM -0700, Yu-cheng Yu wrote: > The x86 family of processors do not directly create read-only and Dirty > PTEs. These PTEs are created by software. One such case is that kernel > read-only pages are historically setup as Dirty. > > New processors that support Shadow Stack regard read-only and Dirty PTEs as > shadow stack pages. This results in ambiguity between shadow stack and > kernel read-only pages. To resolve this, removed Dirty from kernel read- > only pages. > > Signed-off-by: Yu-cheng Yu > Cc: "H. Peter Anvin" > Cc: Kees Cook > Cc: Thomas Gleixner > Cc: Dave Hansen > Cc: Christoph Hellwig > Cc: Andy Lutomirski > Cc: Ingo Molnar > Cc: Borislav Petkov > Cc: Peter Zijlstra Looks good to me. Reviewed-by: Kirill A. Shutemov -- Kirill A. Shutemov