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v1 1/1] KVM: s390: Fix missing present bit for gmap puds To: Claudio Imbrenda , akpm@linux-foundation.org Cc: borntraeger@de.ibm.com, david@redhat.com, Liam.Howlett@oracle.com, airlied@gmail.com, 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, hca@linux.ibm.com, gor@linux.ibm.com, agordeev@linux.ibm.com References: <20251028130150.57379-1-imbrenda@linux.ibm.com> <20251028130150.57379-2-imbrenda@linux.ibm.com> Content-Language: en-US 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 crWmcupQ KNBC5wPS0A1dnzTZNEU1urr0/B8R4M/J6kavDyH9Tuk1wi7PAJrIx/WE+ZNLHGPM2AP9i2mNspNIF8aPphPUkzzL3XXxUepByj7Qxn6FhorLUDJ9wBNAFLWoGrqQKLfRw2o4OIpWgunfGQ1UkbD7e+WwvDj/u0IE6nN72SgJa7XG3cbcxHyUg0O6dlxsz/apILZLCYJRKLx63pwHtVqT3nuIIjQHQmm3SMnA9IjB0RT0CN6Y9/jW94ZrIJye8ePXebPLXPbcs2QrJxdyPSbvuOSJJUFCm3Jo9Kf5MUfvf1DGDu84coJTWbtFkqSGqsCT+TaR5EaEjrRPVOXJU69rT0rHKtDxjnYPhtKDTe2CKBaAiBiaCx0cHRQpma2sfbPzStoQ84AKDQ451mRGFp3KIo4gAQ4d+tnSM2udJ9xSjpcV5/1issuNo0m9zRldqTaJ+mMthQnRZck+PYyxA5nqXK94dkSVWdML97KTtmEd7KuFlGL4u8xy+1Rt/ewo3CJJWp/m9I/Vv2+woH80= 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 10/29/25 00:01, Claudio Imbrenda wrote: > For hugetlbs, gmap puds have the present bit set. For normal puds > (which point to ptes), the bit is not set. This is in contrast to the > normal userspace puds, which always have the bit set for present pmds. > > This causes issues when ___pte_offset_map() is modified to only check > for the present bit. > > The solution to the problem is simply to always set the present bit for > present gmap pmds. > > Signed-off-by: Claudio Imbrenda > Link: https://lore.kernel.org/lkml/20251017144924.10034-1-borntraeger@linux.ibm.com/ > Tested-by: Christian Borntraeger > Acked-by: Christian Borntraeger > --- > arch/s390/mm/gmap.c | 5 +++-- > 1 file changed, 3 insertions(+), 2 deletions(-) > > 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)) { Acked-by: Balbir Singh