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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 Precedence: bulk X-Mailing-List: kvmarm@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: 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 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