From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id A1256C79FB7 for ; Wed, 9 Sep 2026 16:01:55 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id A89576B0093; Wed, 9 Sep 2026 12:01:54 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id A614D6B0095; Wed, 9 Sep 2026 12:01:54 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 950196B00A2; Wed, 9 Sep 2026 12:01:54 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0017.hostedemail.com [216.40.44.17]) by kanga.kvack.org (Postfix) with ESMTP id 6D3CD6B0093 for ; Wed, 9 Sep 2026 12:01:54 -0400 (EDT) Received: from smtpin27.hostedemail.com (lb01a-stub [10.200.18.249]) by unirelay07.hostedemail.com (Postfix) with ESMTP id 6705D16027F for ; Wed, 9 Sep 2026 16:01:53 +0000 (UTC) X-FDA: 85194689706.27.F84C2B1 Received: from tor.source.kernel.org (tor.source.kernel.org [172.105.4.254]) by imf07.hostedemail.com (Postfix) with ESMTP id 91EF84000F for ; Wed, 9 Sep 2026 16:01:51 +0000 (UTC) Authentication-Results: imf07.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20260515 header.b=bPO2z0RN; spf=pass (imf07.hostedemail.com: domain of david@kernel.org designates 172.105.4.254 as permitted sender) smtp.mailfrom=david@kernel.org; dmarc=pass (policy=quarantine) header.from=kernel.org ARC-Seal: i=1; a=rsa-sha256; d=hostedemail.com; s=arc-20220608; cv=none; t=1788969711; b=gqsrtqoUcKD8QC+ETLGYhnPYqMz25ucyF7dPEyBCuQQzTn1Fti7ZtlQBwLYaAh2wCPAnTs nqf6Ji/PuuAsXSLsb8AH5QRnUMnu0DxoRrTkm7IYqLVrjIHcZqNicIpTYhMkKo14PL3YHJ V435oOD+ILIInDVxfJ0zNp9Q6MFTBqo= ARC-Authentication-Results: i=1; imf07.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20260515 header.b=bPO2z0RN; spf=pass (imf07.hostedemail.com: domain of david@kernel.org designates 172.105.4.254 as permitted sender) smtp.mailfrom=david@kernel.org; dmarc=pass (policy=quarantine) header.from=kernel.org ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1788969711; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references:dkim-signature; bh=bhcglVIg8zXwSbsWI5h+bfoKubERpLnIudVPxLA0UXE=; b=f159eWie05H9+IEYeFwQquBMrmoMhb/VHz0ZqqMWb1RMGb8HKwu87rGg+748UFm7Reah+e hANQ6VXisVDndhWjVzFlA5aBL5ivmNaQ76qxMy5sgxzS8MLUitbRwcZgyOjih3N5DchEdD YOMRn1uFoiZlHTaB5y8WPG1wZ6AFWuA= Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) by tor.source.kernel.org (Postfix) with ESMTP id DC4F160200; Wed, 9 Sep 2026 16:01:50 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id CE5691F00A3A; Wed, 9 Sep 2026 16:01:32 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1788969710; bh=bhcglVIg8zXwSbsWI5h+bfoKubERpLnIudVPxLA0UXE=; h=Date:Subject:To:Cc:References:From:In-Reply-To; b=bPO2z0RN/ugIIn93vzjrYlhlc2+pGIpRrg5dV5Kj/x+S6uhDNu0gQ2Tflt0XBK6NZ jDcXvHPqx1BBKEOrsn47W7//Qk0M439jzhJpDgsxOwCD3kA+BWBWKG/0jn2cnDg4Ib b7cH3RBinpH2xiv24FnxMbSnohKTLg7YKmDTL0zHGuQBmV3vDDHRdBW8nioUBR2Two heDpq9ffJlY5U4/hXC3UGIszHmT+RXWbw1ja5L3l7kYf1okUEI2IxyE6+Bta+MsGca PD1BDBVM/FNAIg5rwx9A4TI6cKScsTTkLCgkXAamR1T877nPjhNQIcmGlnqavyLUz8 jQaRJZ24rjmqA== Message-ID: Date: Wed, 9 Sep 2026 18:01:30 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v12 09/45] KVM: guest_memfd: Stub in ability to enable in-place shared<=>private conversion To: ackerleytng@google.com, aik@amd.com, andrew.jones@linux.dev, binbin.wu@linux.intel.com, brauner@kernel.org, chao.p.peng@linux.intel.com, jmattson@google.com, jthoughton@google.com, michael.roth@amd.com, oupton@kernel.org, pankaj.gupta@amd.com, qperret@google.com, rick.p.edgecombe@intel.com, rientjes@google.com, shivankg@amd.com, steven.price@arm.com, willy@infradead.org, wyihan@google.com, yan.y.zhao@intel.com, forkloop@google.com, pratyush@kernel.org, suzuki.poulose@arm.com, aneesh.kumar@kernel.org, liam@infradead.org, Paolo Bonzini , Sean Christopherson , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , x86@kernel.org, "H. Peter Anvin" , Steven Rostedt , Masami Hiramatsu , Mathieu Desnoyers , Jonathan Corbet , Shuah Khan , Shuah Khan , Vishal Annapurve , Andrew Morton , Chris Li , Kairui Song , Kemeng Shi , Nhat Pham , Barry Song , Axel Rasmussen , Yuanchu Xie , Wei Xu , Youngjun Park , Qi Zheng , Shakeel Butt , Kiryl Shutsemau , Baoquan He , Jason Gunthorpe , John Hubbard , Peter Xu , tarunsahu@google.com, Randy Dunlap , Lorenzo Stoakes , Vlastimil Babka , Mike Rapoport , Suren Baghdasaryan , Michal Hocko , Fuad Tabba Cc: kvm@vger.kernel.org, linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org, linux-doc@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-mm@kvack.org, linux-coco@lists.linux.dev, Xiaoyao Li References: <20260830-gmem-inplace-conversion-v12-0-85e5fd25252a@google.com> <20260830-gmem-inplace-conversion-v12-9-85e5fd25252a@google.com> From: "David Hildenbrand (Arm)" Content-Language: en-US Autocrypt: addr=david@kernel.org; keydata= xsFNBFXLn5EBEAC+zYvAFJxCBY9Tr1xZgcESmxVNI/0ffzE/ZQOiHJl6mGkmA1R7/uUpiCjJ dBrn+lhhOYjjNefFQou6478faXE6o2AhmebqT4KiQoUQFV4R7y1KMEKoSyy8hQaK1umALTdL QZLQMzNE74ap+GDK0wnacPQFpcG1AE9RMq3aeErY5tujekBS32jfC/7AnH7I0v1v1TbbK3Gp XNeiN4QroO+5qaSr0ID2sz5jtBLRb15RMre27E1ImpaIv2Jw8NJgW0k/D1RyKCwaTsgRdwuK Kx/Y91XuSBdz0uOyU/S8kM1+ag0wvsGlpBVxRR/xw/E8M7TEwuCZQArqqTCmkG6HGcXFT0V9 PXFNNgV5jXMQRwU0O/ztJIQqsE5LsUomE//bLwzj9IVsaQpKDqW6TAPjcdBDPLHvriq7kGjt WhVhdl0qEYB8lkBEU7V2Yb+SYhmhpDrti9Fq1EsmhiHSkxJcGREoMK/63r9WLZYI3+4W2rAc UucZa4OT27U5ZISjNg3Ev0rxU5UH2/pT4wJCfxwocmqaRr6UYmrtZmND89X0KigoFD/XSeVv jwBRNjPAubK9/k5NoRrYqztM9W6sJqrH8+UWZ1Idd/DdmogJh0gNC0+N42Za9yBRURfIdKSb B3JfpUqcWwE7vUaYrHG1nw54pLUoPG6sAA7Mehl3nd4pZUALHwARAQABzS5EYXZpZCBIaWxk ZW5icmFuZCAoQ3VycmVudCkgPGRhdmlkQGtlcm5lbC5vcmc+wsGQBBMBCAA6AhsDBQkmWAik AgsJBBUKCQgCFgICHgUCF4AWIQQb2cqtc1xMOkYN/MpN3hD3AP+DWgUCaYJt/AIZAQAKCRBN 3hD3AP+DWriiD/9BLGEKG+N8L2AXhikJg6YmXom9ytRwPqDgpHpVg2xdhopoWdMRXjzOrIKD g4LSnFaKneQD0hZhoArEeamG5tyo32xoRsPwkbpIzL0OKSZ8G6mVbFGpjmyDLQCAxteXCLXz ZI0VbsuJKelYnKcXWOIndOrNRvE5eoOfTt2XfBnAapxMYY2IsV+qaUXlO63GgfIOg8RBaj7x 3NxkI3rV0SHhI4GU9K6jCvGghxeS1QX6L/XI9mfAYaIwGy5B68kF26piAVYv/QZDEVIpo3t7 /fjSpxKT8plJH6rhhR0epy8dWRHk3qT5tk2P85twasdloWtkMZ7FsCJRKWscm1BLpsDn6EQ4 jeMHECiY9kGKKi8dQpv3FRyo2QApZ49NNDbwcR0ZndK0XFo15iH708H5Qja/8TuXCwnPWAcJ DQoNIDFyaxe26Rx3ZwUkRALa3iPcVjE0//TrQ4KnFf+lMBSrS33xDDBfevW9+Dk6IISmDH1R HFq2jpkN+FX/PE8eVhV68B2DsAPZ5rUwyCKUXPTJ/irrCCmAAb5Jpv11S7hUSpqtM/6oVESC 3z/7CzrVtRODzLtNgV4r5EI+wAv/3PgJLlMwgJM90Fb3CB2IgbxhjvmB1WNdvXACVydx55V7 LPPKodSTF29rlnQAf9HLgCphuuSrrPn5VQDaYZl4N/7zc2wcWM7BTQRVy5+RARAA59fefSDR 9nMGCb9LbMX+TFAoIQo/wgP5XPyzLYakO+94GrgfZjfhdaxPXMsl2+o8jhp/hlIzG56taNdt VZtPp3ih1AgbR8rHgXw1xwOpuAd5lE1qNd54ndHuADO9a9A0vPimIes78Hi1/yy+ZEEvRkHk /kDa6F3AtTc1m4rbbOk2fiKzzsE9YXweFjQvl9p+AMw6qd/iC4lUk9g0+FQXNdRs+o4o6Qvy iOQJfGQ4UcBuOy1IrkJrd8qq5jet1fcM2j4QvsW8CLDWZS1L7kZ5gT5EycMKxUWb8LuRjxzZ 3QY1aQH2kkzn6acigU3HLtgFyV1gBNV44ehjgvJpRY2cC8VhanTx0dZ9mj1YKIky5N+C0f21 zvntBqcxV0+3p8MrxRRcgEtDZNav+xAoT3G0W4SahAaUTWXpsZoOecwtxi74CyneQNPTDjNg azHmvpdBVEfj7k3p4dmJp5i0U66Onmf6mMFpArvBRSMOKU9DlAzMi4IvhiNWjKVaIE2Se9BY FdKVAJaZq85P2y20ZBd08ILnKcj7XKZkLU5FkoA0udEBvQ0f9QLNyyy3DZMCQWcwRuj1m73D sq8DEFBdZ5eEkj1dCyx+t/ga6x2rHyc8Sl86oK1tvAkwBNsfKou3v+jP/l14a7DGBvrmlYjO 59o3t6inu6H7pt7OL6u6BQj7DoMAEQEAAcLBfAQYAQgAJgIbDBYhBBvZyq1zXEw6Rg38yk3e EPcA/4NaBQJonNqrBQkmWAihAAoJEE3eEPcA/4NaKtMQALAJ8PzprBEXbXcEXwDKQu+P/vts IfUb1UNMfMV76BicGa5NCZnJNQASDP/+bFg6O3gx5NbhHHPeaWz/VxlOmYHokHodOvtL0WCC 8A5PEP8tOk6029Z+J+xUcMrJClNVFpzVvOpb1lCbhjwAV465Hy+NUSbbUiRxdzNQtLtgZzOV Zw7jxUCs4UUZLQTCuBpFgb15bBxYZ/BL9MbzxPxvfUQIPbnzQMcqtpUs21CMK2PdfCh5c4gS sDci6D5/ZIBw94UQWmGpM/O1ilGXde2ZzzGYl64glmccD8e87OnEgKnH3FbnJnT4iJchtSvx yJNi1+t0+qDti4m88+/9IuPqCKb6Stl+s2dnLtJNrjXBGJtsQG/sRpqsJz5x1/2nPJSRMsx9 5YfqbdrJSOFXDzZ8/r82HgQEtUvlSXNaXCa95ez0UkOG7+bDm2b3s0XahBQeLVCH0mw3RAQg r7xDAYKIrAwfHHmMTnBQDPJwVqxJjVNr7yBic4yfzVWGCGNE4DnOW0vcIeoyhy9vnIa3w1uZ 3iyY2Nsd7JxfKu1PRhCGwXzRw5TlfEsoRI7V9A8isUCoqE2Dzh3FvYHVeX4Us+bRL/oqareJ CIFqgYMyvHj7Q06kTKmauOe4Nf0l0qEkIuIzfoLJ3qr5UyXc2hLtWyT9Ir+lYlX9efqh7mOY qIws/H2t In-Reply-To: <20260830-gmem-inplace-conversion-v12-9-85e5fd25252a@google.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Rspamd-Server: rspam10 X-Rspamd-Queue-Id: 91EF84000F X-Stat-Signature: 3gp568mmqtmhmd8jm3mmqeksxnm94ur8 X-Rspam-User: X-HE-Tag: 1788969711-951497 X-HE-Meta: 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 AKc8FDdq ptexB6uDryO/VUfKVMl/9BmsLMUBzsvdiDrtzYVyEmXmUOuoZilPAC5xXpVgd71hUi4AqeCMmwzjz0IG6T4cHYqrQ3t1Rv0gF3M+P8UJulQnqZweCoDjVlGo2Ip4+0Y/euowmjJTJR2cAYIheeEJPjn12qTLWg5iWTp3ly32zrOqk5ZvJ8kIwEIIdvdLnBadvgTJ+TCKx3Hp1BJEciIKdQzgVZ8S9FL5cpHqPfqKyICrFk/aI2mFLec/dMQDTsj6WMi6MDcpP01MyQAD88NSnvh3ihCp1NyaHWCkWPsK83t25gX0woXtfUT8sVz/MxCGM00HAHvZBfwBEvDQd8Mdrf2B+VZu23f9ZxvX1NXpnwcSSeP6yAhNffz5/7w== Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 8/31/26 02:25, Ackerley Tng via B4 Relay wrote: > From: Sean Christopherson > > Stub in global variable to enable in-place guest_memfd private<=>shared > memory conversion, which will eventually be exposed to userspace via a > module param, and wire up the __kvm_is_private_gfn() static call to the > guest_memfd version when in-place conversion is enabled, i.e. when gmem is > the sole authority on private vs. shared memory. > > Cc: Fuad Tabba > Cc: Xiaoyao Li > Signed-off-by: Sean Christopherson > Co-developed-by: Ackerley Tng > Signed-off-by: Ackerley Tng > --- Reviewed-by: David Hildenbrand (Arm) -- Cheers, David