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[2003:cb:c706:2000:e44c:bc46:d8d3:be5]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-4399bea8577sm40051265e9.0.2025.02.20.03.25.08 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 20 Feb 2025 03:25:11 -0800 (PST) Message-ID: <8ddab670-8416-47f2-a5a6-94fb3444f328@redhat.com> Date: Thu, 20 Feb 2025 12:25:07 +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: 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, 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 References: <20250211121128.703390-1-tabba@google.com> <20250211121128.703390-3-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-Rspam-User: X-Rspamd-Server: rspam11 X-Rspamd-Queue-Id: 5F9E12000A X-Stat-Signature: pz3qe8ka914c499or4ri13qcwkzowy8q X-HE-Tag: 1740050716-981483 X-HE-Meta: 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 hxcrRWEU 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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 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 core-mm guest_memfd shim that would always be compiled into the core and decouple KVM from guest_memfd ("library")? -- Cheers, David / dhildenb