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]) by smtp.lore.kernel.org (Postfix) with ESMTP id C9D84C83F1A for ; Mon, 21 Jul 2025 13:30:24 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 67CBB6B0095; Mon, 21 Jul 2025 09:30:24 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 6531B6B0096; Mon, 21 Jul 2025 09:30:24 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 541E96B0098; Mon, 21 Jul 2025 09:30:24 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0011.hostedemail.com [216.40.44.11]) by kanga.kvack.org (Postfix) with ESMTP id 434706B0095 for ; Mon, 21 Jul 2025 09:30:24 -0400 (EDT) Received: from smtpin17.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay03.hostedemail.com (Postfix) with ESMTP id D96AFBAFA4 for ; Mon, 21 Jul 2025 13:30:23 +0000 (UTC) X-FDA: 83688355926.17.35D1AA8 Received: from smtp-out1.suse.de (smtp-out1.suse.de [195.135.223.130]) by imf18.hostedemail.com (Postfix) with ESMTP id 7C7431C0006 for ; Mon, 21 Jul 2025 13:30:21 +0000 (UTC) Authentication-Results: imf18.hostedemail.com; dkim=pass header.d=suse.cz header.s=susede2_rsa header.b=oqtSgejU; dkim=pass header.d=suse.cz header.s=susede2_ed25519 header.b=yTE9LxRL; dkim=pass header.d=suse.cz header.s=susede2_rsa header.b=oqtSgejU; dkim=pass header.d=suse.cz header.s=susede2_ed25519 header.b=yTE9LxRL; spf=pass (imf18.hostedemail.com: domain of vbabka@suse.cz designates 195.135.223.130 as permitted sender) smtp.mailfrom=vbabka@suse.cz; dmarc=none ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1753104621; 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=PaZCofBqOjUcg+lD1fg+YBI1f5pe8r67jPpNIhq9pe8=; b=M5sQW5HnaLnJFYj6ZR3bO+Z7wQAF44VLu+oOX3DnownBFvl6s5thAaG1A+LVr4Ry+Pl2Gd 5WP4r8pU1xC8NSohOUxhRAd8yX5uCvHFHRDyStYSswvi+D6H/Qev3UgDSPg6LCgthZTv0b 8zbn0oRHywQvfOp/oU1OtJjw2v3OShA= ARC-Authentication-Results: i=1; imf18.hostedemail.com; dkim=pass header.d=suse.cz header.s=susede2_rsa header.b=oqtSgejU; dkim=pass header.d=suse.cz header.s=susede2_ed25519 header.b=yTE9LxRL; dkim=pass header.d=suse.cz header.s=susede2_rsa header.b=oqtSgejU; dkim=pass header.d=suse.cz header.s=susede2_ed25519 header.b=yTE9LxRL; spf=pass (imf18.hostedemail.com: domain of vbabka@suse.cz designates 195.135.223.130 as permitted sender) smtp.mailfrom=vbabka@suse.cz; dmarc=none ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1753104621; a=rsa-sha256; cv=none; b=PYsKuBJxWbXGcuQc0Ysonen9HYs46TPZOrSURsbAzJuQTTsnUWd+I86HfAjPZqM7VPHFoM PwkrucT7Tm5E/dNRoYpVHGdchhlbnMVn0jRcjgPujleHlZS7/iQdeohGDkQ/KFfJKqUZ4e 1IfT8VQfch2TJe6xMWB05H481p0BvN4= Received: from imap1.dmz-prg2.suse.org (unknown [10.150.64.97]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) by smtp-out1.suse.de (Postfix) with ESMTPS id A4EF221B69; Mon, 21 Jul 2025 13:30:19 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.cz; s=susede2_rsa; t=1753104619; h=from:from:reply-to: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:autocrypt:autocrypt; bh=PaZCofBqOjUcg+lD1fg+YBI1f5pe8r67jPpNIhq9pe8=; b=oqtSgejUTICJzhBKlkFyj8Tv6TBZ7b5g3f3pRqU00nqdP1pQZ9RYGgTbwWRP6bl3Ag5Q06 lNs65MNLmQSy2Ff6Hs0GVZm4tPio2688eBdEYgwOH8hL3HdC0pWQZxmAYyFS2/+RTjwvMS j3hqomOAFHTsaSMg7P5cpqCNdD6gQwY= DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=suse.cz; s=susede2_ed25519; t=1753104619; h=from:from:reply-to: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:autocrypt:autocrypt; bh=PaZCofBqOjUcg+lD1fg+YBI1f5pe8r67jPpNIhq9pe8=; b=yTE9LxRLSxYvDfmv3jiW9tAHZ8xAAUcvWzT0IN4zAmkD+N8A8Z+CY7t30wiXUzWjokPN1k UAwX92wHByIDrtAg== DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.cz; s=susede2_rsa; t=1753104619; h=from:from:reply-to: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:autocrypt:autocrypt; bh=PaZCofBqOjUcg+lD1fg+YBI1f5pe8r67jPpNIhq9pe8=; b=oqtSgejUTICJzhBKlkFyj8Tv6TBZ7b5g3f3pRqU00nqdP1pQZ9RYGgTbwWRP6bl3Ag5Q06 lNs65MNLmQSy2Ff6Hs0GVZm4tPio2688eBdEYgwOH8hL3HdC0pWQZxmAYyFS2/+RTjwvMS j3hqomOAFHTsaSMg7P5cpqCNdD6gQwY= DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=suse.cz; s=susede2_ed25519; t=1753104619; h=from:from:reply-to: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:autocrypt:autocrypt; bh=PaZCofBqOjUcg+lD1fg+YBI1f5pe8r67jPpNIhq9pe8=; b=yTE9LxRLSxYvDfmv3jiW9tAHZ8xAAUcvWzT0IN4zAmkD+N8A8Z+CY7t30wiXUzWjokPN1k UAwX92wHByIDrtAg== Received: from imap1.dmz-prg2.suse.org (localhost [127.0.0.1]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) by imap1.dmz-prg2.suse.org (Postfix) with ESMTPS id 3FB1D136A8; Mon, 21 Jul 2025 13:30:19 +0000 (UTC) Received: from dovecot-director2.suse.de ([2a07:de40:b281:106:10:150:64:167]) by imap1.dmz-prg2.suse.org with ESMTPSA id fQA/D+tAfmikUwAAD6G6ig (envelope-from ); Mon, 21 Jul 2025 13:30:19 +0000 Message-ID: <651d0f59-990d-460e-829b-be5cb1ee7fe7@suse.cz> Date: Mon, 21 Jul 2025 15:30:19 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH V9 6/7] KVM: guest_memfd: Enforce NUMA mempolicy using shared policy Content-Language: en-US To: Shivank Garg , seanjc@google.com, david@redhat.com, willy@infradead.org, akpm@linux-foundation.org, shuah@kernel.org, pbonzini@redhat.com, brauner@kernel.org, viro@zeniv.linux.org.uk Cc: ackerleytng@google.com, paul@paul-moore.com, jmorris@namei.org, serge@hallyn.com, pvorel@suse.cz, bfoster@redhat.com, tabba@google.com, vannapurve@google.com, chao.gao@intel.com, bharata@amd.com, nikunj@amd.com, michael.day@amd.com, shdhiman@amd.com, yan.y.zhao@intel.com, Neeraj.Upadhyay@amd.com, thomas.lendacky@amd.com, michael.roth@amd.com, aik@amd.com, jgg@nvidia.com, kalyazin@amazon.com, peterx@redhat.com, jack@suse.cz, rppt@kernel.org, hch@infradead.org, cgzones@googlemail.com, ira.weiny@intel.com, rientjes@google.com, roypat@amazon.co.uk, ziy@nvidia.com, matthew.brost@intel.com, joshua.hahnjy@gmail.com, rakie.kim@sk.com, byungchul@sk.com, gourry@gourry.net, kent.overstreet@linux.dev, ying.huang@linux.alibaba.com, apopple@nvidia.com, chao.p.peng@intel.com, amit@infradead.org, ddutile@redhat.com, dan.j.williams@intel.com, ashish.kalra@amd.com, gshan@redhat.com, jgowans@amazon.com, pankaj.gupta@amd.com, papaluri@amd.com, yuzhao@google.com, suzuki.poulose@arm.com, quic_eberman@quicinc.com, aneeshkumar.kizhakeveetil@arm.com, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, linux-security-module@vger.kernel.org, kvm@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-coco@lists.linux.dev References: <20250713174339.13981-2-shivankg@amd.com> <20250713174339.13981-9-shivankg@amd.com> From: Vlastimil Babka Autocrypt: addr=vbabka@suse.cz; keydata= xsFNBFZdmxYBEADsw/SiUSjB0dM+vSh95UkgcHjzEVBlby/Fg+g42O7LAEkCYXi/vvq31JTB KxRWDHX0R2tgpFDXHnzZcQywawu8eSq0LxzxFNYMvtB7sV1pxYwej2qx9B75qW2plBs+7+YB 87tMFA+u+L4Z5xAzIimfLD5EKC56kJ1CsXlM8S/LHcmdD9Ctkn3trYDNnat0eoAcfPIP2OZ+ 9oe9IF/R28zmh0ifLXyJQQz5ofdj4bPf8ecEW0rhcqHfTD8k4yK0xxt3xW+6Exqp9n9bydiy tcSAw/TahjW6yrA+6JhSBv1v2tIm+itQc073zjSX8OFL51qQVzRFr7H2UQG33lw2QrvHRXqD Ot7ViKam7v0Ho9wEWiQOOZlHItOOXFphWb2yq3nzrKe45oWoSgkxKb97MVsQ+q2SYjJRBBH4 8qKhphADYxkIP6yut/eaj9ImvRUZZRi0DTc8xfnvHGTjKbJzC2xpFcY0DQbZzuwsIZ8OPJCc LM4S7mT25NE5kUTG/TKQCk922vRdGVMoLA7dIQrgXnRXtyT61sg8PG4wcfOnuWf8577aXP1x 6mzw3/jh3F+oSBHb/GcLC7mvWreJifUL2gEdssGfXhGWBo6zLS3qhgtwjay0Jl+kza1lo+Cv BB2T79D4WGdDuVa4eOrQ02TxqGN7G0Biz5ZLRSFzQSQwLn8fbwARAQABzSBWbGFzdGltaWwg QmFia2EgPHZiYWJrYUBzdXNlLmN6PsLBlAQTAQoAPgIbAwULCQgHAwUVCgkICwUWAgMBAAIe AQIXgBYhBKlA1DSZLC6OmRA9UCJPp+fMgqZkBQJnyBr8BQka0IFQAAoJECJPp+fMgqZkqmMQ AIbGN95ptUMUvo6aAdhxaOCHXp1DfIBuIOK/zpx8ylY4pOwu3GRe4dQ8u4XS9gaZ96Gj4bC+ jwWcSmn+TjtKW3rH1dRKopvC07tSJIGGVyw7ieV/5cbFffA8NL0ILowzVg8w1ipnz1VTkWDr 2zcfslxJsJ6vhXw5/npcY0ldeC1E8f6UUoa4eyoskd70vO0wOAoGd02ZkJoox3F5ODM0kjHu Y97VLOa3GG66lh+ZEelVZEujHfKceCw9G3PMvEzyLFbXvSOigZQMdKzQ8D/OChwqig8wFBmV QCPS4yDdmZP3oeDHRjJ9jvMUKoYODiNKsl2F+xXwyRM2qoKRqFlhCn4usVd1+wmv9iLV8nPs 2Db1ZIa49fJet3Sk3PN4bV1rAPuWvtbuTBN39Q/6MgkLTYHb84HyFKw14Rqe5YorrBLbF3rl M51Dpf6Egu1yTJDHCTEwePWug4XI11FT8lK0LNnHNpbhTCYRjX73iWOnFraJNcURld1jL1nV r/LRD+/e2gNtSTPK0Qkon6HcOBZnxRoqtazTU6YQRmGlT0v+rukj/cn5sToYibWLn+RoV1CE Qj6tApOiHBkpEsCzHGu+iDQ1WT0Idtdynst738f/uCeCMkdRu4WMZjteQaqvARFwCy3P/jpK uvzMtves5HvZw33ZwOtMCgbpce00DaET4y/UzsBNBFsZNTUBCACfQfpSsWJZyi+SHoRdVyX5 J6rI7okc4+b571a7RXD5UhS9dlVRVVAtrU9ANSLqPTQKGVxHrqD39XSw8hxK61pw8p90pg4G /N3iuWEvyt+t0SxDDkClnGsDyRhlUyEWYFEoBrrCizbmahOUwqkJbNMfzj5Y7n7OIJOxNRkB IBOjPdF26dMP69BwePQao1M8Acrrex9sAHYjQGyVmReRjVEtv9iG4DoTsnIR3amKVk6si4Ea X/mrapJqSCcBUVYUFH8M7bsm4CSxier5ofy8jTEa/CfvkqpKThTMCQPNZKY7hke5qEq1CBk2 wxhX48ZrJEFf1v3NuV3OimgsF2odzieNABEBAAHCwXwEGAEKACYCGwwWIQSpQNQ0mSwujpkQ PVAiT6fnzIKmZAUCZ8gcVAUJFhTonwAKCRAiT6fnzIKmZLY8D/9uo3Ut9yi2YCuASWxr7QQZ lJCViArjymbxYB5NdOeC50/0gnhK4pgdHlE2MdwF6o34x7TPFGpjNFvycZqccSQPJ/gibwNA zx3q9vJT4Vw+YbiyS53iSBLXMweeVV1Jd9IjAoL+EqB0cbxoFXvnjkvP1foiiF5r73jCd4PR rD+GoX5BZ7AZmFYmuJYBm28STM2NA6LhT0X+2su16f/HtummENKcMwom0hNu3MBNPUOrujtW khQrWcJNAAsy4yMoJ2Lw51T/5X5Hc7jQ9da9fyqu+phqlVtn70qpPvgWy4HRhr25fCAEXZDp xG4RNmTm+pqorHOqhBkI7wA7P/nyPo7ZEc3L+ZkQ37u0nlOyrjbNUniPGxPxv1imVq8IyycG AN5FaFxtiELK22gvudghLJaDiRBhn8/AhXc642/Z/yIpizE2xG4KU4AXzb6C+o7LX/WmmsWP Ly6jamSg6tvrdo4/e87lUedEqCtrp2o1xpn5zongf6cQkaLZKQcBQnPmgHO5OG8+50u88D9I rywqgzTUhHFKKF6/9L/lYtrNcHU8Z6Y4Ju/MLUiNYkmtrGIMnkjKCiRqlRrZE/v5YFHbayRD dJKXobXTtCBYpLJM4ZYRpGZXne/FAtWNe4KbNJJqxMvrTOrnIatPj8NhBVI0RSJRsbilh6TE m6M14QORSWTLRg== In-Reply-To: <20250713174339.13981-9-shivankg@amd.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Rspam-User: X-Rspamd-Queue-Id: 7C7431C0006 X-Rspamd-Server: rspam06 X-Stat-Signature: erru5ah9588h6a76w6i6s9az8o4tyq6y X-HE-Tag: 1753104621-571291 X-HE-Meta: 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 w3FCuO+l qBynGFyXw/BkdSbrAQYBj8l/qSdiKbYLF0hJlUnWahrcgx5ktZmoI9/RLDEDWkbmGs4X4bWZa+GSeAKM0ig3Miwe+cw== 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 7/13/25 19:43, Shivank Garg wrote: > Previously, guest-memfd allocations followed local NUMA node id in absence > of process mempolicy, resulting in arbitrary memory allocation. > Moreover, mbind() couldn't be used by the VMM as guest memory wasn't > mapped into userspace when allocation occurred. > > Enable NUMA policy support by implementing vm_ops for guest-memfd mmap > operation. This allows the VMM to map the memory and use mbind() to set the > desired NUMA policy. The policy is stored in the inode structure via > kvm_gmem_inode_info, as memory policy is a property of the memory (struct > inode) itself. The policy is then retrieved via mpol_shared_policy_lookup() > and passed to filemap_grab_folio_mpol() to ensure that allocations follow > the specified memory policy. > > This enables the VMM to control guest memory NUMA placement by calling > mbind() on the mapped memory regions, providing fine-grained control over > guest memory allocation across NUMA nodes. > > The policy change only affect future allocations and does not migrate > existing memory. This matches mbind(2)'s default behavior which affects > only new allocations unless overridden with MPOL_MF_MOVE/MPOL_MF_MOVE_ALL > flags, which are not supported for guest_memfd as it is unmovable. > > Suggested-by: David Hildenbrand > Signed-off-by: Shivank Garg Acked-by: Vlastimil Babka