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[2003:d8:2f19:9c00:568:7df7:e1:293d]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-452730d1636sm14094965e9.38.2025.06.06.02.13.21 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 06 Jun 2025 02:13:23 -0700 (PDT) Message-ID: <79dcd7b3-f0f3-453d-9c9f-746ebbe81ad2@redhat.com> Date: Fri, 6 Jun 2025 11:13:20 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v11 09/18] KVM: guest_memfd: Track shared memory support in memslot To: Fuad Tabba , kvm@vger.kernel.org, linux-arm-msm@vger.kernel.org, linux-mm@kvack.org, kvmarm@lists.linux.dev 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, 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: <20250605153800.557144-1-tabba@google.com> <20250605153800.557144-10-tabba@google.com> From: David Hildenbrand Autocrypt: addr=david@redhat.com; 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charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Rspamd-Server: rspam01 X-Rspamd-Queue-Id: B3AE31C0007 X-Stat-Signature: ohxhk7wfnhc9oho1i5yswc1fmxhbpfzs X-Rspam-User: X-HE-Tag: 1749201207-901826 X-HE-Meta: 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 hjWdWJ8J 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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 05.06.25 17:37, Fuad Tabba wrote: > Add a new internal flag in the top half of memslot->flags to track when > a guest_memfd-backed slot supports shared memory, which is reserved for > internal use in KVM. > > This avoids repeatedly checking the underlying guest_memfd file for > shared memory support, which requires taking a reference on the file. > > Suggested-by: David Hildenbrand > Signed-off-by: Fuad Tabba > --- Acked-by: David Hildenbrand -- Cheers, David / dhildenb