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AJvYcCVsoDwEtAQDh7l2WsqK1V58HDYqo6ofT7RcFkhmbIbe6Y5Dy1q1eUlI4hk8kOGNSYhIInj6K5/5GA==@kvack.org X-Gm-Message-State: AOJu0YxLqStpz1euVo+meTc0FOR3aLLzgN0bryHg1YQZIqcS75OLswXI 2i8V974ol7O0z4rQzOp9xhpuG0EB3XWHimZEvA5BX0GBgIYq8/UMdc///dssYvbYqgZSXtQ3ML4 ieHl2WQjQkuXpjg6pEiyKAvpyFRBKqqO6Qf5r X-Google-Smtp-Source: AGHT+IEPzZYRUYBZDGGZnE1YCDc46bSYVdLJ+yiGqVFt9StDeDnto1Lbfh+eC0TGRLr+N2ieM1Z/sn2o6ag0xZNnFbs= X-Received: by 2002:a05:6512:2821:b0:535:3d14:1313 with SMTP id 2adb3069b0e04-539e5e762e7mr28681e87.0.1728670326127; Fri, 11 Oct 2024 11:12:06 -0700 (PDT) MIME-Version: 1.0 References: <59e218670565accf978aeb8cf4745de4c0738773.1727440966.git.lorenzo.stoakes@oracle.com> In-Reply-To: <59e218670565accf978aeb8cf4745de4c0738773.1727440966.git.lorenzo.stoakes@oracle.com> From: Jann Horn Date: Fri, 11 Oct 2024 20:11:28 +0200 Message-ID: Subject: Re: [RFC PATCH 1/4] mm: pagewalk: add the ability to install PTEs To: Lorenzo Stoakes Cc: Andrew Morton , Suren Baghdasaryan , "Liam R . Howlett" , Matthew Wilcox , Vlastimil Babka , "Paul E . McKenney" , David Hildenbrand , linux-mm@kvack.org, linux-kernel@vger.kernel.org, Muchun Song , Richard Henderson , Ivan Kokshaysky , Matt Turner , Thomas Bogendoerfer , "James E . J . Bottomley" , Helge Deller , Chris Zankel , Max Filippov , Arnd Bergmann , linux-alpha@vger.kernel.org, linux-mips@vger.kernel.org, linux-parisc@vger.kernel.org, linux-arch@vger.kernel.org, Shuah Khan , Christian Brauner , linux-kselftest@vger.kernel.org, Sidhartha Kumar Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Rspamd-Queue-Id: 353D4C001A X-Rspam-User: X-Rspamd-Server: rspam05 X-Stat-Signature: 79c4c6qrhcessdqijw7i1du31yg3gdgd X-HE-Tag: 1728670326-635980 X-HE-Meta: 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 oen/c+jd xFaefR4HlxguTpFZfIvZ1WJaPg7lV7GUOsyPIz/r5br9KaWXqoqV74k0erJhAnHtdopVb7GWasRNu3d8Z150IfDg5JY+A/JVM2U/hOEADSHjBtuELweTAharos+8+YBMXRIJzjq7f95BDzWeYiCJ9ilzO8HLl7i+mJ95ctoDHVk002kSa02SYGrkTJ2tUjIEb7vD/ZDcn6MC6md/KRfVExC0e4g6QX0hS4I4wN51XDdrP5rGrmJwzGsbLVw== X-Bogosity: Ham, tests=bogofilter, spamicity=0.000047, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Fri, Sep 27, 2024 at 2:51=E2=80=AFPM Lorenzo Stoakes wrote: > Rather than add yet another implementation, we extend the generic pagewal= k > logic to enable the installation of page table entries by adding a new > install_pte() callback in mm_walk_ops. If this is specified, then upon > encountering a missing page table entry, we allocate and install a new on= e > and continue the traversal. [...] > > Signed-off-by: Lorenzo Stoakes Reviewed-by: Jann Horn