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charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Stat-Signature: iiu45cye83pgaf15xuzm6qodaiqcmwy3 X-Rspamd-Queue-Id: B0A461C0007 X-Rspamd-Server: rspam06 X-Rspam-User: X-HE-Tag: 1761217910-102944 X-HE-Meta: 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 PQveJxlg 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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 23.10.25 13:10, David Hildenbrand wrote: > On 23.10.25 12:54, David Hildenbrand wrote: >> On 23.10.25 12:31, Kiryl Shutsemau wrote: >>> On Wed, Oct 22, 2025 at 07:28:27PM +0200, David Hildenbrand wrote: >>>> "garbage" as in pointing at something without a direct map, something that's >>>> protected differently (MTE? weird CoCo protection?) or even worse MMIO with >>>> undesired read-effects. >>> >>> Pedro already points to the problem with missing direct mapping. >>> _nofault() copy should help with this. >> >> Yeah, we do something similar when reading the kcore for that reason. >> >>> >>> Can direct mapping ever be converted to MMIO? It can be converted to DMA >>> buffer (which is fine), but MMIO? I have not seen it even in virtualized >>> environments. >> >> I recall discussions in the context of PAT and the adjustment of caching >> attributes of the direct map for MMIO purposes: so I suspect there are >> ways that can happen, but I am not 100% sure. >> >> >> Thinking about it, in VMs we have the direct map set on balloon inflated >> pages that should not be touched, not even read, otherwise your >> hypervisor might get very angry. That case we could likely handle by >> checking whether the source page actually exists and doesn't have >> PageOffline() set, before accessing it. A bit nasty. >> >> A more obscure cases would probably be reading a page that was poisoned >> by hardware and is not expected to be used anymore. Could also be >> checked by checking the page. >> >> Essentially all cases where we try to avoid reading ordinary memory >> already when creating memory dumps that might have a direct map. >> >> >> Regarding MTE and load_unaligned_zeropad(): I don't know unfortunately. > > Looking into this, I'd assume the exception handler will take care of it. > > load_unaligned_zeropad() is interesting if there is a direct map but the > memory should not be touched (especially regarding PageOffline and > memory errors). > > I read drivers/firmware/efi/unaccepted_memory.c where we there is a > lengthy discussion about guard pages and how that works for unaccepted > memory. > > While it works for unaccepted memory, it wouldn't work for other random Sorry I meant here "while that works for load_unaligned_zeropad()". -- Cheers David / dhildenb