Message-ID: <e00da5d6-3589-481d-adb0-6c57e727486b@kernel.org>
Date: Thu, 15 Jan 2026 21:04:53 +0100
From: "David Hildenbrand (Red Hat)" <david@...nel.org>
To: "Kalyazin, Nikita" <kalyazin@...zon.co.uk>,
 "kvm@...r.kernel.org" <kvm@...r.kernel.org>,
 "linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
 "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
 "linux-arm-kernel@...ts.infradead.org"
 <linux-arm-kernel@...ts.infradead.org>,
 "kvmarm@...ts.linux.dev" <kvmarm@...ts.linux.dev>,
 "linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>,
 "linux-mm@...ck.org" <linux-mm@...ck.org>,
 "bpf@...r.kernel.org" <bpf@...r.kernel.org>,
 "linux-kselftest@...r.kernel.org" <linux-kselftest@...r.kernel.org>,
 "kernel@...0n.name" <kernel@...0n.name>,
 "linux-riscv@...ts.infradead.org" <linux-riscv@...ts.infradead.org>,
 "linux-s390@...r.kernel.org" <linux-s390@...r.kernel.org>,
 "loongarch@...ts.linux.dev" <loongarch@...ts.linux.dev>
Cc: "pbonzini@...hat.com" <pbonzini@...hat.com>,
 "corbet@....net" <corbet@....net>, "maz@...nel.org" <maz@...nel.org>,
 "oupton@...nel.org" <oupton@...nel.org>,
 "joey.gouly@....com" <joey.gouly@....com>,
 "suzuki.poulose@....com" <suzuki.poulose@....com>,
 "yuzenghui@...wei.com" <yuzenghui@...wei.com>,
 "catalin.marinas@....com" <catalin.marinas@....com>,
 "will@...nel.org" <will@...nel.org>, "seanjc@...gle.com"
 <seanjc@...gle.com>, "tglx@...utronix.de" <tglx@...utronix.de>,
 "mingo@...hat.com" <mingo@...hat.com>, "bp@...en8.de" <bp@...en8.de>,
 "dave.hansen@...ux.intel.com" <dave.hansen@...ux.intel.com>,
 "x86@...nel.org" <x86@...nel.org>, "hpa@...or.com" <hpa@...or.com>,
 "luto@...nel.org" <luto@...nel.org>,
 "peterz@...radead.org" <peterz@...radead.org>,
 "willy@...radead.org" <willy@...radead.org>,
 "akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
 "lorenzo.stoakes@...cle.com" <lorenzo.stoakes@...cle.com>,
 "Liam.Howlett@...cle.com" <Liam.Howlett@...cle.com>,
 "vbabka@...e.cz" <vbabka@...e.cz>, "rppt@...nel.org" <rppt@...nel.org>,
 "surenb@...gle.com" <surenb@...gle.com>, "mhocko@...e.com"
 <mhocko@...e.com>, "ast@...nel.org" <ast@...nel.org>,
 "daniel@...earbox.net" <daniel@...earbox.net>,
 "andrii@...nel.org" <andrii@...nel.org>,
 "martin.lau@...ux.dev" <martin.lau@...ux.dev>,
 "eddyz87@...il.com" <eddyz87@...il.com>, "song@...nel.org"
 <song@...nel.org>, "yonghong.song@...ux.dev" <yonghong.song@...ux.dev>,
 "john.fastabend@...il.com" <john.fastabend@...il.com>,
 "kpsingh@...nel.org" <kpsingh@...nel.org>, "sdf@...ichev.me"
 <sdf@...ichev.me>, "haoluo@...gle.com" <haoluo@...gle.com>,
 "jolsa@...nel.org" <jolsa@...nel.org>, "jgg@...pe.ca" <jgg@...pe.ca>,
 "jhubbard@...dia.com" <jhubbard@...dia.com>,
 "peterx@...hat.com" <peterx@...hat.com>, "jannh@...gle.com"
 <jannh@...gle.com>, "pfalcato@...e.de" <pfalcato@...e.de>,
 "shuah@...nel.org" <shuah@...nel.org>, "riel@...riel.com"
 <riel@...riel.com>, "ryan.roberts@....com" <ryan.roberts@....com>,
 "jgross@...e.com" <jgross@...e.com>,
 "yu-cheng.yu@...el.com" <yu-cheng.yu@...el.com>,
 "kas@...nel.org" <kas@...nel.org>, "coxu@...hat.com" <coxu@...hat.com>,
 "kevin.brodsky@....com" <kevin.brodsky@....com>,
 "ackerleytng@...gle.com" <ackerleytng@...gle.com>,
 "maobibo@...ngson.cn" <maobibo@...ngson.cn>,
 "prsampat@....com" <prsampat@....com>,
 "mlevitsk@...hat.com" <mlevitsk@...hat.com>,
 "jmattson@...gle.com" <jmattson@...gle.com>,
 "jthoughton@...gle.com" <jthoughton@...gle.com>,
 "agordeev@...ux.ibm.com" <agordeev@...ux.ibm.com>,
 "alex@...ti.fr" <alex@...ti.fr>,
 "aou@...s.berkeley.edu" <aou@...s.berkeley.edu>,
 "borntraeger@...ux.ibm.com" <borntraeger@...ux.ibm.com>,
 "chenhuacai@...nel.org" <chenhuacai@...nel.org>,
 "dev.jain@....com" <dev.jain@....com>, "gor@...ux.ibm.com"
 <gor@...ux.ibm.com>, "hca@...ux.ibm.com" <hca@...ux.ibm.com>,
 "Jonathan.Cameron@...wei.com" <Jonathan.Cameron@...wei.com>,
 "palmer@...belt.com" <palmer@...belt.com>, "pjw@...nel.org"
 <pjw@...nel.org>,
 "shijie@...amperecomputing.com" <shijie@...amperecomputing.com>,
 "svens@...ux.ibm.com" <svens@...ux.ibm.com>,
 "thuth@...hat.com" <thuth@...hat.com>, "wyihan@...gle.com"
 <wyihan@...gle.com>,
 "yang@...amperecomputing.com" <yang@...amperecomputing.com>,
 "vannapurve@...gle.com" <vannapurve@...gle.com>,
 "jackmanb@...gle.com" <jackmanb@...gle.com>,
 "aneesh.kumar@...nel.org" <aneesh.kumar@...nel.org>,
 "patrick.roy@...ux.dev" <patrick.roy@...ux.dev>,
 "Thomson, Jack" <jackabt@...zon.co.uk>,
 "Itazuri, Takahiro" <itazur@...zon.co.uk>,
 "Manwaring, Derek" <derekmn@...zon.com>, "Cali, Marco"
 <xmarcalx@...zon.co.uk>
Subject: Re: [PATCH v9 02/13] mm/gup: drop secretmem optimization from
 gup_fast_folio_allowed

On 1/14/26 14:45, Kalyazin, Nikita wrote:
> From: Patrick Roy <patrick.roy@...ux.dev>
> 
> This drops an optimization in gup_fast_folio_allowed() where
> secretmem_mapping() was only called if CONFIG_SECRETMEM=y. secretmem is
> enabled by default since commit b758fe6df50d ("mm/secretmem: make it on
> by default"), so the secretmem check did not actually end up elided in
> most cases anymore anyway.
> 
> This is in preparation of the generalization of handling mappings where
> direct map entries of folios are set to not present.  Currently,
> mappings that match this description are secretmem mappings
> (memfd_secret()).  Later, some guest_memfd configurations will also fall
> into this category.
> 
> Signed-off-by: Patrick Roy <patrick.roy@...ux.dev>
> Acked-by: Vlastimil Babka <vbabka@...e.cz>
> Signed-off-by: Nikita Kalyazin <kalyazin@...zon.com>

Acked-by: David Hildenbrand (Red Hat) <david@...nel.org>

-- 
Cheers

David

Powered by blists - more mailing lists