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[2003:cb:c706:2000:e44c:bc46:d8d3:be5]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-4398a8007easm101290405e9.21.2025.02.20.03.39.07 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 20 Feb 2025 03:39:10 -0800 (PST) Message-ID: <9751bcb1-bbbe-4586-b4bc-2b8f2ca98cc8@redhat.com> Date: Thu, 20 Feb 2025 12:39:06 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v3 04/11] KVM: guest_memfd: Add KVM capability to check if guest_memfd is shared From: David Hildenbrand 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, yu.c.zhang@linux.intel.com, isaku.yamahata@intel.com, mic@digikod.net, vbabka@suse.cz, vannapurve@google.com, ackerleytng@google.com, mail@maciej.szmigiero.name, 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 References: <20250211121128.703390-1-tabba@google.com> <20250211121128.703390-5-tabba@google.com> <9abf6dd8-919d-44a4-8352-ee350fec8ad3@redhat.com> Autocrypt: addr=david@redhat.com; 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charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Rspam-User: X-Rspamd-Server: rspam09 X-Rspamd-Queue-Id: 4656580014 X-Stat-Signature: g7wpc83k6q3ejfuzcprbc1a6hkxbpoqe X-HE-Tag: 1740051558-615411 X-HE-Meta: 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 dbl7awqy 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.004975, 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 20.02.25 12:37, David Hildenbrand wrote: > On 11.02.25 13:11, Fuad Tabba wrote: >> Add the KVM capability KVM_CAP_GMEM_SHARED_MEM, which indicates >> that the VM supports shared memory in guest_memfd, or that the >> host can create VMs that support shared memory. Supporting shared >> memory implies that memory can be mapped when shared with the >> host. > > Was there a good reason to not squash this into the next patch? Sorry, I was confused, I meant the previous commit, where we essentially add the mmap option in the first place. -- Cheers, David / dhildenb