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linux-next: KVM/s390x regression To: Christian Borntraeger , Claudio Imbrenda , David Hildenbrand Cc: Liam.Howlett@oracle.com, airlied@gmail.com, akpm@linux-foundation.org, apopple@nvidia.com, baohua@kernel.org, baolin.wang@linux.alibaba.com, byungchul@sk.com, dakr@kernel.org, dev.jain@arm.com, dri-devel@lists.freedesktop.org, francois.dugast@intel.com, gourry@gourry.net, joshua.hahnjy@gmail.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org, lorenzo.stoakes@oracle.com, lyude@redhat.com, matthew.brost@intel.com, mpenttil@redhat.com, npache@redhat.com, osalvador@suse.de, rakie.kim@sk.com, rcampbell@nvidia.com, ryan.roberts@arm.com, simona@ffwll.ch, ying.huang@linux.alibaba.com, ziy@nvidia.com, kvm@vger.kernel.org, linux-s390@vger.kernel.org, linux-next@vger.kernel.org, Heiko Carstens , Vasily Gorbik , Alexander Gordeev References: <20251001065707.920170-4-balbirs@nvidia.com> <20251017144924.10034-1-borntraeger@linux.ibm.com> <9beff9d6-47c7-4a65-b320-43efd1e12687@redhat.com> 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 1SPeoE1W 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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 10/28/25 04:06, Christian Borntraeger wrote: > Am 27.10.25 um 17:47 schrieb Claudio Imbrenda: >> On Mon, 20 Oct 2025 10:41:28 +0200 >> David Hildenbrand wrote: >> >>> On 20.10.25 09:00, Christian Borntraeger wrote: >>>> Am 17.10.25 um 23:56 schrieb Balbir Singh: >>>>    >>>>> In the meanwhile, does this fix/workaround work? >>>>> >>>>> diff --git a/mm/pgtable-generic.c b/mm/pgtable-generic.c >>>>> index 0c847cdf4fd3..31c1754d5bd4 100644 >>>>> --- a/mm/pgtable-generic.c >>>>> +++ b/mm/pgtable-generic.c >>>>> @@ -290,7 +290,7 @@ pte_t *___pte_offset_map(pmd_t *pmd, unsigned long addr, pmd_t *pmdvalp) >>>>>             if (pmdvalp) >>>>>             *pmdvalp = pmdval; >>>>> -    if (unlikely(pmd_none(pmdval) || !pmd_present(pmdval))) >>>>> +    if (unlikely(pmd_none(pmdval) || is_pmd_non_present_folio_entry(pmdval))) >>>>>             goto nomap; >>>>>         if (unlikely(pmd_trans_huge(pmdval))) >>>>>             goto nomap; >>>>>   >>>> >>>> Yes, this seems to work. >>> >>> Right, but that's not what we will want here. We'll have to adjust s390x >>> gmap code (which is getting redesigned either way) to only take the page >>> lock. >>> >>> In the end, we'll want here later a single >>> >>> if (!pmd_present(pmdval)) >>>     goto nomap; >>> >> >> this seems to do the trick: >> >> diff --git a/arch/s390/mm/gmap.c b/arch/s390/mm/gmap.c >> index 8ff6bba107e8..22c448b32340 100644 >> --- a/arch/s390/mm/gmap.c >> +++ b/arch/s390/mm/gmap.c >> @@ -599,8 +599,9 @@ int __gmap_link(struct gmap *gmap, unsigned long >> gaddr, unsigned long vmaddr) | _SEGMENT_ENTRY_GMAP_UC >>                                          | _SEGMENT_ENTRY; >>                          } else >> -                               *table = pmd_val(*pmd) & >> -                                       _SEGMENT_ENTRY_HARDWARE_BITS; >> +                               *table = (pmd_val(*pmd) & >> +                                       _SEGMENT_ENTRY_HARDWARE_BITS) >> +                                       | _SEGMENT_ENTRY; >>                  } >>          } else if (*table & _SEGMENT_ENTRY_PROTECT && >>                     !(pmd_val(*pmd) & _SEGMENT_ENTRY_PROTECT)) { >> >> > > Tested-by: Christian Borntraeger > Acked-by: Christian Borntraeger > > can you send a proper patch? I guess we should add it to Andrews mm true to keep it close to the patch that uncovered the issue. > s390 maintainers cced. Thanks for finding the fix. Ideally, we want this fix just before my series if possible! Balbir