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[2003:d8:2f1e:c400:a7bb:d0cb:2506:c714]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-3a1f58f2fc4sm8649497f8f.56.2025.05.11.01.03.02 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Sun, 11 May 2025 01:03:03 -0700 (PDT) Message-ID: <702d9951-ac26-4ee4-8a78-d5104141c2e4@redhat.com> Date: Sun, 11 May 2025 10:03:01 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v8 08/13] KVM: guest_memfd: Allow host to map guest_memfd() pages To: James Houghton , Fuad Tabba Cc: kvm@vger.kernel.org, linux-arm-msm@vger.kernel.org, linux-mm@kvack.org, 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, peterx@redhat.com, pankaj.gupta@amd.com References: <20250430165655.605595-1-tabba@google.com> <20250430165655.605595-9-tabba@google.com> From: David Hildenbrand Autocrypt: addr=david@redhat.com; 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charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-Rspamd-Queue-Id: 09284140007 X-Stat-Signature: d8k4y5dizgwncqccr96efcazzsuf4zm1 X-Rspam-User: X-Rspamd-Server: rspam08 X-HE-Tag: 1746950588-949605 X-HE-Meta: U2FsdGVkX1+MroAXbRoPdBwqjAdNbpy8GkbatL4Ny1gXeucaC/abWPhF8JOESXMYS2NXkDMzlMyN2fJ+9ZYcu3ChEUEu4HST4M6MMW2dlOGY2YNB0Hw77X/QODHFr/5Ls8QPzlccoo4aDEB/u8qECeSyhDmbucj4o+3dyZCpUwok8cQfxjpeFdPAZj4U5g2uoQI810CDzwiRuBRYjV1Ls84EZ11xLl33fNCfGQToU2qpbTBykCuKmuhHpNltpWcmG8PqXYYotSOeR5GQxK2zzGPO4vpCYhoVylIzYxXknvQWDK8TCXDO9K7po48j4vYE0uGjSRGYZhpWSTN5m5cfzexkDtoqSpakNE2c7zm/6n3rd7btFWaGAy8Jv4sbMZ+jF0mm6M0E49Yh3oRL+oYBnZ8z1FOXU0FkUtmPq9c5noVp9bexWEW5lcKH/lR+WCbNzMuIS+pNirNfBkECz13cu/TwbMoRTRi3yzupLlQKamEyIcAvKrqA5KyQa8DkLfHf4yHruL3V1ltJd8kPNxfYaeeC+BvxxGiTqwBA0GixBumTq+m27cNJsXPg10LgzoZAd7eZtqlnrsmXU3/efFCIwINK40/Avn+NEN2J0OvLBxEnMAHeHI3ZB3LB2QLarvCSlR53/9sV4XgiK2U3uXB9WnPxBlN+WbLx9iMZK6cJV+qhm6faQmtEgj2PPqnL3Q53AWx8yAtGVW0sV2sqT9nMHeliKkAbIlnPdA6QC392zPH/k2h+1rkRoAfq4YT3Ec/HXJQrhfDhWk9LrusSa2/3sum6Vol/svhZRkSnwGqvs+ol+u4NSdtuCH0/4qCzKxNq6GobypuxgZRcwD+TY6exbVoNyGPFxGHVDmgBPzZX3p+izuP5JnajJRIL1qIv4Knpylg74MYB8ckmbnGANMOUSrCXXo7472v0bqRr1BsOELzKEzzjUwyUKuiJla8FmZF1AxVH8YqLQ50VREjOcRT qlOxdTFd 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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 09.05.25 22:54, James Houghton wrote: > On Wed, Apr 30, 2025 at 9:57 AM Fuad Tabba wrote: >> +static int kvm_gmem_mmap(struct file *file, struct vm_area_struct *vma) >> +{ >> + struct kvm_gmem *gmem = file->private_data; >> + >> + if (!kvm_arch_gmem_supports_shared_mem(gmem->kvm)) >> + return -ENODEV; >> + >> + if ((vma->vm_flags & (VM_SHARED | VM_MAYSHARE)) != >> + (VM_SHARED | VM_MAYSHARE)) { >> + return -EINVAL; >> + } >> + >> + vm_flags_set(vma, VM_DONTDUMP); > > Hi Fuad, > > Sorry if I missed this, but why exactly do we set VM_DONTDUMP here? > Could you leave a small comment? (I see that it seems to have > originally come from Patrick? [1]) I get that guest memory VMAs > generally should have VM_DONTDUMP; is there a bigger reason? (David replying) I assume because we might have inaccessible parts in there that SIGBUS on access. get_dump_page() does ignore any errors, though (returning NULL), so likely we don't need VM_DONTDUMP. -- Cheers, David / dhildenb