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[149.14.88.26]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-4771902fa8dsm39879465e9.8.2025.10.29.03.00.14 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 29 Oct 2025 03:00:15 -0700 (PDT) Message-ID: Date: Wed, 29 Oct 2025 11:00:14 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v1 1/1] KVM: s390: Fix missing present bit for gmap puds To: Claudio Imbrenda , akpm@linux-foundation.org Cc: balbirs@nvidia.com, borntraeger@de.ibm.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> From: David Hildenbrand Autocrypt: addr=david@redhat.com; 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charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Rspam-User: X-Rspamd-Queue-Id: 4F0451A000A X-Rspamd-Server: rspam03 X-Stat-Signature: zfm88zuiwmx9h7r5ynr1f3occndg8cua X-HE-Tag: 1761732021-519218 X-HE-Meta: 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 7OmkUzAw 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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 28.10.25 14:01, 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; I'd add a comment here like /* Make sure that pmd_present() will work on these entries. */ > + *table = (pmd_val(*pmd) & > + _SEGMENT_ENTRY_HARDWARE_BITS) > + | _SEGMENT_ENTRY; > } > } else if (*table & _SEGMENT_ENTRY_PROTECT && > !(pmd_val(*pmd) & _SEGMENT_ENTRY_PROTECT)) { Reviewed-by: David Hildenbrand -- Cheers David / dhildenb