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[2003:cb:c706:2000:e44c:bc46:d8d3:be5]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-38f259d5b40sm20619360f8f.68.2025.02.20.03.32.16 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 20 Feb 2025 03:32:18 -0800 (PST) Message-ID: <6dbe4547-2271-4db9-9cf6-2c497c45eff6@redhat.com> Date: Thu, 20 Feb 2025 12:32:15 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v3 02/11] KVM: guest_memfd: Handle final folio_put() of guest_memfd pages To: Vlastimil Babka , 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, 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> <20250211121128.703390-3-tabba@google.com> <8ddab670-8416-47f2-a5a6-94fb3444f328@redhat.com> <5746ef9f-92da-4f83-bdf8-96169b090cff@suse.cz> From: David Hildenbrand Autocrypt: addr=david@redhat.com; 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charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Rspam-User: X-Stat-Signature: puxhzpzrhwyd5kwgmpqioyo68wan9tgh X-Rspamd-Server: rspam05 X-Rspamd-Queue-Id: 9789A180023 X-HE-Tag: 1740051143-144996 X-HE-Meta: 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 QT0OPYR7 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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 20.02.25 12:28, Vlastimil Babka wrote: > On 2/20/25 12:25, David Hildenbrand wrote: >> On 11.02.25 13:11, Fuad Tabba wrote: >>> Before transitioning a guest_memfd folio to unshared, thereby >>> disallowing access by the host and allowing the hypervisor to >>> transition its view of the guest page as private, we need to be >>> sure that the host doesn't have any references to the folio. >>> >>> This patch introduces a new type for guest_memfd folios, which >>> isn't activated in this series but is here as a placeholder and >>> to facilitate the code in the next patch. This will be used in >>> the future to register a callback that informs the guest_memfd >>> subsystem when the last reference is dropped, therefore knowing >>> that the host doesn't have any remaining references. >>> >>> Signed-off-by: Fuad Tabba >>> --- >> >> [...] >> >>> static const char *page_type_name(unsigned int page_type) >>> diff --git a/mm/swap.c b/mm/swap.c >>> index 47bc1bb919cc..241880a46358 100644 >>> --- a/mm/swap.c >>> +++ b/mm/swap.c >>> @@ -38,6 +38,10 @@ >>> #include >>> #include >>> >>> +#ifdef CONFIG_KVM_GMEM_SHARED_MEM >>> +#include >>> +#endif >>> + >>> #include "internal.h" >>> >>> #define CREATE_TRACE_POINTS >>> @@ -101,6 +105,11 @@ static void free_typed_folio(struct folio *folio) >>> case PGTY_hugetlb: >>> free_huge_folio(folio); >>> return; >>> +#endif >>> +#ifdef CONFIG_KVM_GMEM_SHARED_MEM >>> + case PGTY_guestmem: >>> + kvm_gmem_handle_folio_put(folio); >>> + return; >> >> Hm, if KVM is built as a module, will that work? Or would we need the > > Good catch, I guess not? > >> core-mm guest_memfd shim that would always be compiled into the core and >> decouple KVM from guest_memfd ("library")? > > That could also help avoid exporting the mpol symbols in the NUMA mempolicy > series? Yes [1]! :) [1] https://lore.kernel.org/linux-mm/9392618e-32de-4a86-9e1e-bcfeefe39181@redhat.com/ -- Cheers, David / dhildenb