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X-Proofpoint-Spam-Info: AW1haW4tMjYwODA0MDE3MiBTYWx0ZWRfX36qSDom3ffm8 Y7OXAcBgld9lpVdtmdrkYv7AO5mrrc5fF2r7UiPC4DCgWKLumrDJYUWHshgkvEke/58jCpDADqR PBFw2GBkRyo9syRMSv6QAuJpj5CmX6AS23FXqoaVKdnznkfdnmLH X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwODA0MDE3MiBTYWx0ZWRfXz2DXHEgKmiw/ A4/SZuTdoeMTtFWRZjEXtbshCZUUjsaq9MlUaR4UoUI6o2uNJiJAIojMorXIqv+R23oUP5UX5Ak qiaRYO1GdMoWyf6dyzX6z4ti/ATq7JEPADffqEkXxCBpF8P8i8SRCLtLi27Yn5Qcmoo9XuN28Et pyxnnwssNTGhTCfjYg0zJZdW7OobVJUpBT5XgLdr2fx/NHNzpXeuYyMeeoCUFyhGwubJ52+x5BM 0fxq+VMxc2AD4jOeKcJStKrt1RsCnS6ikV5vRkuL10OyHDAYTC5olO43DkgRplSlNtWeuYZCOVC VGCgFv1bRgemLFBX8znBsq/ddEqtdLIcgzzQcM8qTYN0baRgjkLeuu0eA7PWpEN0XC7emYWsEcw 85jvws6Ee77bQBUTkXaAtHkQBX4TfBWo4575utt5wyRW6s/+fv+U3JLR3Y4wQzrpCoGrij5hsg+ z7CP2xRgF+BXl0yDq/GBPkNZdrK/gp/+p3+tKzXI= X-Authority-Analysis: v=2.4 cv=Iqcutr/g c=1 sm=1 tr=0 ts=6a725838 b=1 cx=c_pps a=zPCbziy225d3KhSqZt3L1A==:117 a=zPCbziy225d3KhSqZt3L1A==:17 a=6eWqkTHjU83fiwn7nKZWdM+Sl24=:19 a=z/mQ4Ysz8XfWz/Q5cLBRGdckG28=:19 a=lCpzRmAYbLLaTzLvsPZ7Mbvzbb8=:19 a=xqWC_Br6kY4A:10 a=IkcTkHD0fZMA:10 a=Sv0fKeRqtYgA:10 a=GoEa3M9JfhUA:10 a=VkNPw1HP01LnGYTKEx00:22 a=jiCTI4zE5U7BLdzWsZGv:22 a=o5oIOnhZENCTenyL_yNV:22 a=RpNjiQI2AAAA:8 a=yPCof4ZbAAAA:8 a=7moai9Aca__2MZ1UBNsA:9 a=3ZKOabzyN94A:10 a=QEXdDO2ut3YA:10 a=5yU3S35YU4bGjq-dph-N:22 a=Bho9c0fBagfJEIQBS7DQ:22 cc=ntf awl=host:12100 On 8/4/2026 8:35 AM, Matthew Wilcox wrote: > On Mon, Aug 03, 2026 at 11:=E2=80=8A40:=E2=80=8A25PM -0700, jane.=E2=80= =8Achu@=E2=80=8Aoracle.=E2=80=8Acom=20 > wrote: > Patch itself looks good, so Reviewed-by: Jane Chu oracle.=E2=80=8Acom> Thanks! > That said, there is a pre-existing issue: = >=20 > folio_free_raw_hwp() should check >=20 >=20 > On Mon, Aug 03, 2026 at 11:40:25PM -0700, jane.chu@oracle.com wrote: >> Patch itself looks good, so Reviewed-by: Jane Chu >=20 > Thanks! >=20 >> That said, there is a pre-existing issue: >> folio_free_raw_hwp() should check HPG_raw_hwp_unreliable, and fail the a= ct >> of unpoison just like what __update_and_free_hugetlb_folio() does - >>=20 >> static void __update_and_free_hugetlb_folio(struct hstate *h, >> struct folio *folio) >> { >> bool clear_flag =3D folio_test_hugetlb_vmemmap_optimized(folio); >>=20 >> if (hstate_is_gigantic_no_runtime(h)) >> return; >>=20 >> /* >> * If we don't know which subpages are hwpoisoned, we can't free >> * the hugepage, so it's leaked intentionally. >> */ >> if (folio_test_hugetlb_raw_hwp_unreliable(folio)) >> return; >=20 > I'm not sure I agree with that, but I'm new to hugetlb & hwpoison > handling, so please check my reasoning. >=20 > We set the unreliable bit when memory allocation fails (ie we can't > allocate a raw_hwp_page). That does mean that if we have a real hardware > error, we can't know which page was poisoned, but for a simulated hwpoison > which we are now clearing, it doesn't matter which page specifically > contained the hwpoison. We're going to unpoison all of the pages in > this hugetlb folio anyway. >=20 > Maybe there's more to it than that. >=20 First, I take back my comment about a pre-existing issue, because folio_free_raw_hwp() does call if=20 (folio_test_hugetlb_raw_hwp_unreliable(folio)) and bail out if true, before it calls __folio_free_raw_hwp() to dissolve the list. So, apology for the false alarm. Also agreed with you that once a non-simulated hwpoison occurs, unpoison=20 will be disallowed for the remaining life time of the kernel. But I think the reason we don't dissolve the raw_hwp_list if=20 PG_raw_hwp_unreliable is set is that, doing so would screw the=20 validation tests and maybe some body's monitoring mechanism. Had PG_raw_hwp_unreliable got set in a non-simulation scenario,=20 immediately, OOM could happen, but then, we still lose the hugetlb folio=20 for the remaining life of the kernel. Unless someone come up with a=20 better solution to replace the raw_hwp_list. :) thanks, -jane