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charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Stat-Signature: xxm7teauxfm37irm8gd3nfzzuiq9uw3c X-Rspamd-Server: rspam01 X-Rspamd-Queue-Id: D5EFD20005 X-Rspam-User: X-HE-Tag: 1745852334-113516 X-HE-Meta: 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 DoRj/aSF 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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: >> What it does on PAT (only implementation so far ...) is looking up the >> memory type to select the caching mode that can be use. >> >> "sanitize" was IMHO a good fit, because we must make sure that we don't use >> the wrong caching mode. >> >> update/setup/... don't make that quite clear. Any other suggestions? > > I'm very poor on naming.. :( So far anything seems slightly better than > sanitize to me, as the word "sanitize" is actually also used in memtype.c > for other purpose.. see sanitize_phys(). Sure, one can sanitize a lot of things. Here it's the cachemode/pgrpot, in the other functions it's an address. Likely we should just call it pfnmap_X_cachemode()/ Set/update don't really fit for X in case pfnmap_X_cachemode() is a NOP. pfnmap_setup_cachemode() ? Hm. > >> >>> >>>> + * @pfn: the start of the pfn range >>>> + * @size: the size of the pfn range >>>> + * @prot: the pgprot to sanitize >>>> + * >>>> + * Sanitize the given pgprot for a pfn range, for example, adjusting the >>>> + * cachemode. >>>> + * >>>> + * This function cannot fail for a single page, but can fail for multiple >>>> + * pages. >>>> + * >>>> + * Returns 0 on success and -EINVAL on error. >>>> + */ >>>> +int pfnmap_sanitize_pgprot(unsigned long pfn, unsigned long size, >>>> + pgprot_t *prot); >>>> extern int track_pfn_copy(struct vm_area_struct *dst_vma, >>>> struct vm_area_struct *src_vma, unsigned long *pfn); >>>> extern void untrack_pfn_copy(struct vm_area_struct *dst_vma, >>>> diff --git a/mm/huge_memory.c b/mm/huge_memory.c >>>> index fdcf0a6049b9f..b8ae5e1493315 100644 >>>> --- a/mm/huge_memory.c >>>> +++ b/mm/huge_memory.c >>>> @@ -1455,7 +1455,9 @@ vm_fault_t vmf_insert_pfn_pmd(struct vm_fault *vmf, pfn_t pfn, bool write) >>>> return VM_FAULT_OOM; >>>> } >>>> - track_pfn_insert(vma, &pgprot, pfn); >>>> + if (pfnmap_sanitize_pgprot(pfn_t_to_pfn(pfn), PAGE_SIZE, &pgprot)) >>>> + return VM_FAULT_FALLBACK; >>> >>> Would "pgtable" leak if it fails? If it's PAGE_SIZE, IIUC it won't ever >>> trigger, though. >>> >>> Maybe we could have a "void pfnmap_sanitize_pgprot_pfn(&pgprot, pfn)" to >>> replace track_pfn_insert() and never fail? Dropping vma ref is definitely >>> a win already in all cases. >> >> It could be a simple wrapper around pfnmap_sanitize_pgprot(), yes. That's >> certainly helpful for the single-page case. >> >> Regarding never failing here: we should check the whole range. We have to >> make sure that none of the pages has a memory type / caching mode that is >> incompatible with what we setup. > > Would it happen in real world? > > IIUC per-vma registration needs to happen first, which checks for memtype > conflicts in the first place, or reserve_pfn_range() could already have > failed. > > Here it's the fault path looking up the memtype, so I would expect it is > guaranteed all pfns under the same vma is following the verified (and same) > memtype? The whole point of track_pfn_insert() is that it is used when we *don't* use reserve_pfn_range()->track_pfn_remap(), no? track_pfn_remap() would check the whole range that gets mapped, so track_pfn_insert() user must similarly check the whole range that gets mapped. Note that even track_pfn_insert() is already pretty clear on the intended usage: "called when a _new_ single pfn is established" -- Cheers, David / dhildenb