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[175.34.62.5]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-23506bd8e2dsm116565275ad.56.2025.06.05.02.59.02 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 05 Jun 2025 02:59:20 -0700 (PDT) Message-ID: <0b329f63-dbb6-4652-b598-2b07bd4f5e67@redhat.com> Date: Thu, 5 Jun 2025 19:59:00 +1000 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v10 15/16] KVM: Introduce the KVM capability KVM_CAP_GMEM_SHARED_MEM To: Fuad Tabba , kvm@vger.kernel.org, linux-arm-msm@vger.kernel.org, linux-mm@kvack.org Cc: pbonzini@redhat.com, chenhuacai@kernel.org, mpe@ellerman.id.au, anup@brainfault.org, paul.walmsley@sifive.com, palmer@dabbelt.com, aou@eecs.berkeley.edu, seanjc@google.com, viro@zeniv.linux.org.uk, brauner@kernel.org, willy@infradead.org, akpm@linux-foundation.org, xiaoyao.li@intel.com, yilun.xu@intel.com, chao.p.peng@linux.intel.com, jarkko@kernel.org, amoorthy@google.com, dmatlack@google.com, isaku.yamahata@intel.com, mic@digikod.net, vbabka@suse.cz, vannapurve@google.com, ackerleytng@google.com, mail@maciej.szmigiero.name, david@redhat.com, michael.roth@amd.com, wei.w.wang@intel.com, liam.merwick@oracle.com, isaku.yamahata@gmail.com, kirill.shutemov@linux.intel.com, suzuki.poulose@arm.com, steven.price@arm.com, quic_eberman@quicinc.com, quic_mnalajal@quicinc.com, quic_tsoni@quicinc.com, quic_svaddagi@quicinc.com, quic_cvanscha@quicinc.com, quic_pderrin@quicinc.com, quic_pheragu@quicinc.com, catalin.marinas@arm.com, james.morse@arm.com, yuzenghui@huawei.com, oliver.upton@linux.dev, maz@kernel.org, will@kernel.org, qperret@google.com, keirf@google.com, roypat@amazon.co.uk, shuah@kernel.org, hch@infradead.org, jgg@nvidia.com, rientjes@google.com, jhubbard@nvidia.com, fvdl@google.com, hughd@google.com, jthoughton@google.com, peterx@redhat.com, pankaj.gupta@amd.com, ira.weiny@intel.com References: <20250527180245.1413463-1-tabba@google.com> <20250527180245.1413463-16-tabba@google.com> From: Gavin Shan In-Reply-To: <20250527180245.1413463-16-tabba@google.com> X-Mimecast-Spam-Score: 0 X-Mimecast-MFC-PROC-ID: 0jCHrEtXB4XmLWAWpnEgBj2qb2LKYYB7o8FAVTpvau4_1749117562 X-Mimecast-Originator: redhat.com Content-Language: en-US Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Rspam-User: X-Rspamd-Queue-Id: CE5011C0012 X-Rspamd-Server: rspam09 X-Stat-Signature: zbnafjyqaiukdb67g35m34hfzdyrmt84 X-HE-Tag: 1749117564-588062 X-HE-Meta: U2FsdGVkX1+lecmE9XBh4WzGcKE2MU1yRQOxjmfMpv4kWvdCMYgipOdsPbzlfQm1hcx1yaSJDyPg6JH1fintJNgBkDw7CWhsFvOF7UtOMiXvODslQ2Hzl3I6z6LhWfauAAtGbe3z7JQkF1l/5+b2cechp45KzYXiTjaxrvqXSodaDnRmCcVqKuSKGuaI4gROq2+U33tlA85Y1zWhm/x6TQmr4XFCEVcaYdUkYSNfJejZlYomVsV6KKja6n/mEhHsPGEXBVu0ZMc+KREtKanAlqER69Et3U26MoAoaRnBVuKxgA9XTXQ8fhs9XJr6fXKimN4po69O0C2ir8TPceWWS3Dayr9xBUPd4lN48d2+4iddbaUCnUJZxQTa2qS1yLkSgBnSjcNU9HK5RHVEbWQRPhQcaE4vFMFqJ+b2Djdc9uSKt9SOqeknaEl23stNEa7Us0lmXyqPhHI0SicAGF1QufQ+ME+E1lzr0ebuVMrzxYY+h2sczdCYtOfjAboSHoVe2+5ohu47UzSdzr4qfnuasV+L7hWx5t8Phi4uFvOhsHSx2OQ37WQ5cy22oT7lcQLFuGI3YbKcao9yS/+19MuqiulW458zBnGoE8DbznNH1h0IN9KY3kUGd91iUQJRnOzH12zskWB/7AKaLINo/VbSNV1hpvZ2q+gMvqL8HJXlGWdPzcyhed+dtk6zcF3amEzwcbG6zvsjCvSjrE5u/39twx+bmSbZHUzD9jnsgxYAn5Z37fXGcpG66T4ndUFFaPwCxP5jTtw0zZQbsZNFyZSLnMkWSlCBHsWdIIWACMgX092SJBRokjscPJLr4FOgKllchdTHwkrcD2klJhjrKdhqsiWMcK1xGpqrLfSKcVbBa65SlUm92rH4FjoT7zKu+jrM8GxI1XKslfbGqpTPb47zJjUsAXB6jXH4+Rvdf1z1Vbrao/ZPW9myM/tEWgwibnsfnetIcFLG6PvTYf6HqQE GoCHSxZm 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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 5/28/25 4:02 AM, Fuad Tabba wrote: > This patch introduces the KVM capability KVM_CAP_GMEM_SHARED_MEM, which > indicates that guest_memfd supports shared memory (when enabled by the > flag). This support is limited to certain VM types, determined per > architecture. > > This patch also updates the KVM documentation with details on the new > capability, flag, and other information about support for shared memory > in guest_memfd. > > Reviewed-by: David Hildenbrand > Signed-off-by: Fuad Tabba > --- > Documentation/virt/kvm/api.rst | 9 +++++++++ > include/uapi/linux/kvm.h | 1 + > virt/kvm/kvm_main.c | 4 ++++ > 3 files changed, 14 insertions(+) > Reviewed-by: Gavin Shan