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charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Rspamd-Queue-Id: C769718001F X-Stat-Signature: kbe4o69t7i5wkbyotikucnpqjy6swwzg X-Rspam-User: X-Rspamd-Server: rspam10 X-HE-Tag: 1740050544-682531 X-HE-Meta: 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 KDCKKhAI 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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: >>> +#endif >>> + >>> #endif >>> diff --git a/include/linux/page-flags.h b/include/linux/page-flags.h >>> index 6dc2494bd002..734afda268ab 100644 >>> --- a/include/linux/page-flags.h >>> +++ b/include/linux/page-flags.h >>> @@ -933,6 +933,17 @@ enum pagetype { >>> PGTY_slab = 0xf5, >>> PGTY_zsmalloc = 0xf6, >>> PGTY_unaccepted = 0xf7, >>> + /* >>> + * guestmem folios are used to back VM memory as managed by guest_memfd. >>> + * Once the last reference is put, instead of freeing these folios back >>> + * to the page allocator, they are returned to guest_memfd. >>> + * >>> + * For now, guestmem will only be set on these folios as long as they >>> + * cannot be mapped to user space ("private state"), with the plan of >> >> Might be a bit misleading as I don't think it's set yet as of this series. >> But I guess we can keep it to avoid another update later. > > You're right, it's not in this series. But as you said, the idea is to > have the least amount of churn in the core mm code. I proposed adding the latter, to make it clearer that the purpose of these things is to be mapped to user space long-term (-> be a proper folio, like hugetlb folios will have to be), compared to long-term not being a folio (slab, offline, unaccepted, ...). Might become relevant for people working on the memdesc work, to know what to do here. (or at least have less questions :) ) -- Cheers, David / dhildenb