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[2003:d8:2f28:c100:2225:10aa:f247:7b85]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-45b79799c4fsm25881455e9.3.2025.08.28.03.27.04 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 28 Aug 2025 03:27:05 -0700 (PDT) Message-ID: <786503d6-e58d-412a-a17b-f5e4e481c3fe@redhat.com> Date: Thu, 28 Aug 2025 12:27:04 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v5 05/12] KVM: Documentation: describe GUEST_MEMFD_FLAG_NO_DIRECT_MAP To: "Roy, Patrick" , "seanjc@google.com" Cc: "tabba@google.com" , "ackerleytng@google.com" , "pbonzini@redhat.com" , "kvm@vger.kernel.org" , "linux-arm-kernel@lists.infradead.org" , "kvmarm@lists.linux.dev" , "linux-kernel@vger.kernel.org" , "linux-mm@kvack.org" , "rppt@kernel.org" , "will@kernel.org" , "vbabka@suse.cz" , "Cali, Marco" , "Kalyazin, Nikita" , "Thomson, Jack" , "Manwaring, Derek" References: <20250828093902.2719-1-roypat@amazon.co.uk> <20250828093902.2719-6-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-Rspamd-Server: rspam08 X-Rspamd-Queue-Id: 10ADE1A0006 X-Stat-Signature: 3bqci96tgahmyyy4omppnm9eu8dmmenm X-Rspam-User: X-HE-Tag: 1756376829-81710 X-HE-Meta: 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 SDRUEA4y 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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 28.08.25 11:39, Roy, Patrick wrote: > Signed-off-by: Patrick Roy > --- > Documentation/virt/kvm/api.rst | 5 +++++ > 1 file changed, 5 insertions(+) > > diff --git a/Documentation/virt/kvm/api.rst b/Documentation/virt/kvm/api.rst > index c17a87a0a5ac..b52c14d58798 100644 > --- a/Documentation/virt/kvm/api.rst > +++ b/Documentation/virt/kvm/api.rst > @@ -6418,6 +6418,11 @@ When the capability KVM_CAP_GUEST_MEMFD_MMAP is supported, the 'flags' field > supports GUEST_MEMFD_FLAG_MMAP. Setting this flag on guest_memfd creation > enables mmap() and faulting of guest_memfd memory to host userspace. > > +When the capability KVM_CAP_GMEM_NO_DIRECT_MAP is supported, the 'flags' field > +supports GUEST_MEMFG_FLAG_NO_DIRECT_MAP. Setting this flag makes the guest_memfd > +instance behave similarly to memfd_secret, and unmaps the memory backing it from > +the kernel's address space after allocation. > + > When the KVM MMU performs a PFN lookup to service a guest fault and the backing > guest_memfd has the GUEST_MEMFD_FLAG_MMAP set, then the fault will always be > consumed from guest_memfd, regardless of whether it is a shared or a private WARNING: Missing commit description - Add an appropriate one WARNING: From:/Signed-off-by: email name mismatch: 'From: "Roy, Patrick" ' != 'Signed-off-by: Patrick Roy ' -- Cheers David / dhildenb