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[2003:d8:2f02:2900:f54f:bad7:c5f4:9404]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-39eae9807b7sm10596804f8f.60.2025.04.14.03.06.43 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 14 Apr 2025 03:06:45 -0700 (PDT) Message-ID: Date: Mon, 14 Apr 2025 12:06:42 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v7 3/9] KVM: guest_memfd: Allow host to map guest_memfd() pages 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, 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 References: <20250318161823.4005529-1-tabba@google.com> <20250318161823.4005529-4-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: rspam11 X-Rspamd-Queue-Id: EC604C000F X-Stat-Signature: twh3goude147xdqyw3dx1x6yxpjeuy3n X-Rspam-User: X-HE-Tag: 1744625209-578854 X-HE-Meta: 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 6uvUU3Wc 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000007, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: > + /* > + * Shared folios would not be marked as "guestmem" so far, and we only > + * expect shared folios at this point. > + */ > + if (WARN_ON_ONCE(folio_test_guestmem(folio))) { > + ret = VM_FAULT_SIGBUS; > + goto out_folio; > + } With that dropped for now Acked-by: David Hildenbrand -- Cheers, David / dhildenb