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[80.187.83.189]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-426ce5e7e44sm407353f8f.46.2025.10.09.12.19.16 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 09 Oct 2025 12:19:17 -0700 (PDT) Message-ID: <6a2e341b-7aa2-4bd8-bce5-dfdbd08d92b6@redhat.com> Date: Thu, 9 Oct 2025 21:19:15 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v5 2/8] mm: Actually mark kernel page table pages To: Lu Baolu , Joerg Roedel , Will Deacon , Robin Murphy , Kevin Tian , Jason Gunthorpe , Jann Horn , Vasant Hegde , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , Alistair Popple , Peter Zijlstra , Uladzislau Rezki , Jean-Philippe Brucker , Andy Lutomirski , Yi Lai Cc: iommu@lists.linux.dev, security@kernel.org, x86@kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, Dave Hansen References: <20250919054007.472493-1-baolu.lu@linux.intel.com> <20250919054007.472493-3-baolu.lu@linux.intel.com> From: David Hildenbrand Autocrypt: addr=david@redhat.com; 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charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Rspamd-Server: rspam12 X-Rspamd-Queue-Id: 7C66D18000C X-Stat-Signature: shfo7r1tfaeun85n756xypb7qnay6f6t X-Rspam-User: X-HE-Tag: 1760037563-373660 X-HE-Meta: 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 EHPvIWSr 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 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: List-Subscribe: List-Unsubscribe: On 19.09.25 07:40, Lu Baolu wrote: > From: Dave Hansen > > Now that the API is in place, mark kernel page table pages just > after they are allocated. Unmark them just before they are freed. > > Note: Unconditionally clearing the 'kernel' marking (via > ptdesc_clear_kernel()) would be functionally identical to what > is here. But having the if() makes it logically clear that this > function can be used for kernel and non-kernel page tables. > > Signed-off-by: Dave Hansen > Signed-off-by: Lu Baolu > Reviewed-by: Jason Gunthorpe > Reviewed-by: Kevin Tian > --- Acked-by: David Hildenbrand -- Cheers David / dhildenb