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[2003:cb:c73e:aa00:c9db:441d:a65e:6999]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-439b02ce60asm149821775e9.7.2025.02.25.08.55.54 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 25 Feb 2025 08:55:55 -0800 (PST) Message-ID: Date: Tue, 25 Feb 2025 17:55:53 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v4 04/12] KVM: Add capability to discover KVM_GMEM_NO_DIRECT_MAP support To: Patrick Roy , rppt@kernel.org, seanjc@google.com Cc: pbonzini@redhat.com, corbet@lwn.net, willy@infradead.org, akpm@linux-foundation.org, song@kernel.org, jolsa@kernel.org, ast@kernel.org, daniel@iogearbox.net, andrii@kernel.org, martin.lau@linux.dev, eddyz87@gmail.com, yonghong.song@linux.dev, john.fastabend@gmail.com, kpsingh@kernel.org, sdf@fomichev.me, haoluo@google.com, Liam.Howlett@oracle.com, lorenzo.stoakes@oracle.com, vbabka@suse.cz, jannh@google.com, shuah@kernel.org, kvm@vger.kernel.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org, bpf@vger.kernel.org, linux-kselftest@vger.kernel.org, tabba@google.com, jgowans@amazon.com, graf@amazon.com, kalyazin@amazon.com, xmarcalx@amazon.com, derekmn@amazon.com, jthoughton@google.com References: <20250221160728.1584559-1-roypat@amazon.co.uk> <20250221160728.1584559-5-roypat@amazon.co.uk> From: David Hildenbrand Autocrypt: addr=david@redhat.com; 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charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Stat-Signature: 7rfi1ahokafdhekon7c3msk6zspi6ie1 X-Rspamd-Server: rspam06 X-Rspamd-Queue-Id: 551BA100002 X-Rspam-User: X-HE-Tag: 1740502560-854996 X-HE-Meta: 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 CA78mJEo 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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 21.02.25 17:07, Patrick Roy wrote: > Add a capability to let userspace discover whether guest_memfd supports > removing its folios from the direct map. Support depends on guest_memfd > itself being supported, but also on whether KVM can manipulate the > direct map at page granularity at all (possible most of the time, just > arm64 is a notable outlier where its impossible if the direct map has > been setup using hugepages, as arm64 cannot break these apart due to > break-before-make semantics). > > Signed-off-by: Patrick Roy > --- Not sure how KVM folks handle that, but I suspect we would just want to squash that into the previous commit, -- Cheers, David / dhildenb