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b=BqVokPVvZ1I0WlzrkqlMDQMlpZNQB9N/qOPkBiT0LURAhedQrNDM1lEezottPtKSI WPkTYEj5tHLq9G9eoDJIj36r3bo21CgiCJ2VO3i7b+WK0hnTv7B/YZOJr+zg21WdTm oJhhdCUrG0h1Fb6vjvrgcW8ONwX8jVn6F0sul1Oylbwr0NbttNm0GjE2EgKWqH6iC0 hTKKAv9rMxrt2wcGIHcY0OCPBl6yIdROcCapjrR10JCfzj0FYKnq8AF+wRxMZCypZG kE4itXhxK2L15K6iR997oS2vMsRfP9O4wSD44fw4DPOSOHrMCDb91RJKkcmNotON1S KCnywlu1HDv7g== Message-ID: Date: Wed, 8 Apr 2026 09:54:05 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH] docs: proc: document ProtectionKey in smaps To: Kevin Brodsky , Randy Dunlap , Dave Hansen , linux-doc@vger.kernel.org Cc: linux-kernel@vger.kernel.org, Yury Khrustalev , Jonathan Corbet , Shuah Khan , Dave Hansen , Andrew Morton , Lorenzo Stoakes , Vlastimil Babka , Mark Rutland , linux-fsdevel@vger.kernel.org, linux-mm@kvack.org References: <20260407125133.564182-1-kevin.brodsky@arm.com> <98880cc2-09be-4bd8-b8f4-f0f0845f939e@intel.com> <2d2aac86-2780-4a29-9eef-116c26485812@arm.com> <18e2042c-d414-40fb-8819-5e930d5b1584@infradead.org> <8a5e4afd-cd0a-400a-8624-79c1dc9e3ff3@kernel.org> <971a511a-f311-4e2f-8b10-85d11e07bb0a@arm.com> From: "David Hildenbrand (Arm)" Content-Language: en-US Autocrypt: addr=david@kernel.org; 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charset=UTF-8 Content-Transfer-Encoding: 7bit X-Rspamd-Queue-Id: 5DE9D40002 X-Stat-Signature: 3s5t38rj4gutjsj4qtcnrekimifjnu3j X-Rspam-User: X-Rspamd-Server: rspam07 X-HE-Tag: 1775634850-728301 X-HE-Meta: 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 jov7bpw4 h+0ghKv/DwOqIsg5bxwYEbmvTQSwk8t645iabs59YUsbfYm2kdlJlPmpXj2s+0qH0zmOmyj5s9HWO+JV21rU7N2bX+mdeZE1TZcJp85lC8o+eywA83WiKwjN1LmKKPhRVFrw6Z1Ww1HOLJB86QrorbR4bxkFDpicWJOh1P0HdMNMIjOuY4dDDNHqM+kTtsa5m4m3xuF8GBvXFVOMrKNZICxxxjn9KfNidH2BNtStKHZwTOnwYfDKrgABeveAfD0IjOMYwd8HtQ4xivaQuWHTs1h1x34i+O7Y4b5nL Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 4/8/26 09:50, Kevin Brodsky wrote: > On 08/04/2026 09:39, David Hildenbrand (Arm) wrote: >> On 4/8/26 09:15, Kevin Brodsky wrote: >>> Of course that's also possible, "hardware" has to be interpreted in the >>> context of virtualisation... But granted it is possible to hide features >>> even on the host with the right kernel parameter, on arm64 at least. >>> >>> "If the kernel supports protection keys (pkeys) and the hardware feature >>> is detected"? Still vague but a little more accurate. >> Can we just talk about CPU support, to avoid using "system" or "hardware" ? > > I'm not sure how this addresses your concern with virtualisation though, > unless "CPU" is understood as whatever CPU is virtualised? But then the > same logic could apply to "hardware"... > > Either way, I'm really not all that picky about it, I don't mind: "If > both the kernel and the CPU support protection keys" LGTM -- Cheers, David