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[2003:d8:2f00:4000:a438:1541:1da1:723a]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-458691b0f59sm25842795e9.29.2025.07.23.07.46.14 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 23 Jul 2025 07:46:16 -0700 (PDT) Message-ID: <3d310152-34dd-4e44-92e8-a4e94c6480ad@redhat.com> Date: Wed, 23 Jul 2025 16:46:14 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v15 14/21] KVM: x86: Enable guest_memfd mmap for default VM type To: Sean Christopherson , Vishal Annapurve Cc: Xiaoyao Li , Fuad Tabba , kvm@vger.kernel.org, linux-arm-msm@vger.kernel.org, linux-mm@kvack.org, kvmarm@lists.linux.dev, pbonzini@redhat.com, chenhuacai@kernel.org, mpe@ellerman.id.au, anup@brainfault.org, paul.walmsley@sifive.com, palmer@dabbelt.com, aou@eecs.berkeley.edu, viro@zeniv.linux.org.uk, brauner@kernel.org, willy@infradead.org, akpm@linux-foundation.org, 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, 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: <505a30a3-4c55-434c-86a5-f86d2e9dc78a@intel.com> <1fe0f46a-152a-4b5b-99e2-2a74873dafdc@intel.com> From: David Hildenbrand Autocrypt: addr=david@redhat.com; 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charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Rspamd-Queue-Id: 04E4A10000C X-Stat-Signature: pdyk4nsse7zyndqo1jr9wqu68muqq6bp X-Rspam-User: X-Rspamd-Server: rspam08 X-HE-Tag: 1753281981-987582 X-HE-Meta: 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 VeEe4WZz 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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 23.07.25 16:43, Sean Christopherson wrote: > On Wed, Jul 23, 2025, Vishal Annapurve wrote: >> 2) Userspace brings a mappable guest_memfd to back guest private >> memory (passed as guest_memfd field in the >> KVM_USERSPACE_MEMORY_REGION2): KVM will always fault in all guest >> faults via guest_memfd so if userspace brings in VMAs that point to >> different physical memory then there would be a discrepancy between >> what guest and userspace/KVM (going through HVAs) sees for shared >> memory ranges. I am not sure if KVM needs to enforce anything here, > > We agreed (I think in a guest_memfd call?) that KVM won't enforce anything, Right. We'll document it but not sanity check it at KVM slot creation time. If the VMM does something stupid, not our problem. -- Cheers, David / dhildenb