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CXL device poison discovered before > hot-added memory is onlined is recorded separately in the pre-online > poison registry. > > Extend __free_pages_core() to send a block to free_poisoned_block() when > it intersects either poison source. In free_poisoned_block(), withhold a > page when its PFN is registered as pre-online poison or its physical > address is present in the inherited-poison table. > > Pages identified by either source continue through > hwpoison_boot_page(), while clean pages are released through > accept_and_free_block(). > > Signed-off-by: Shaikh Kamaluddin > --- > mm/page_alloc.c | 8 ++++++-- > 1 file changed, 6 insertions(+), 2 deletions(-) > > diff --git a/mm/page_alloc.c b/mm/page_alloc.c > index cca67a2702a4..57843df01b2a 100644 > --- a/mm/page_alloc.c > +++ b/mm/page_alloc.c > @@ -33,6 +33,7 @@ > #include > #include > #include > +#include > #include > #include > #include > @@ -1601,12 +1602,14 @@ static void __meminit free_poisoned_block(struct page *page, unsigned int order, > enum meminit_context context) > { > unsigned long i, nr_pages = 1UL << order; > + unsigned long pfn = page_to_pfn(page); > > for (i = 0; i < nr_pages; i++) { > struct page *p = page + i; > phys_addr_t phys = page_to_phys(p); > > - if (range_contains_poisoned_memory(phys, PAGE_SIZE)) { > + if (range_contains_poisoned_memory(phys, PAGE_SIZE) || > + preonline_hwpoison_contains(pfn + i)) { > hwpoison_boot_page(p, context); > continue; > } > @@ -1652,7 +1655,8 @@ void __meminit __free_pages_core(struct page *page, unsigned int order, > > /* First: a block parked by __free_unaccepted() never returns here. */ > if (range_contains_poisoned_memory(page_to_phys(page), > - PAGE_SIZE << order)) { > + PAGE_SIZE << order) || > + preonline_hwpoison_intersects(page_to_pfn(page), nr_pages)) { > free_poisoned_block(page, order, context); > return; > } > -- > 2.43.0 > Hi Shaikh, I think the idea of discovering device poison first is good, but the boundary should be more strictly designed. Now if I don't get it wrong, if we turn on memory_hotplug.memmap_on_memory, we can have part of CXL memory to do the bookkeeping for itself, without using the existing RAM. What if that bookkeeping part is poisoned ? the check ignores this situation right ? What about draw a clear line between normal RAM and hot-add CXL memory, have the latter gone through the thorough check and do the rest you want ? Best regards, Richard Cheng.