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[2003:d8:2f0c:c200:fa4a:c4ff:1b32:21ce]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-427f00b985esm14635943f8f.34.2025.10.20.01.41.29 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 20 Oct 2025 01:41:30 -0700 (PDT) Message-ID: <748cdc18-e32d-41bd-90d1-a102b1c51e06@redhat.com> Date: Mon, 20 Oct 2025 10:41:28 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: linux-next: KVM/s390x regression To: Christian Borntraeger , Balbir Singh , Claudio Imbrenda 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 References: <20251001065707.920170-4-balbirs@nvidia.com> <20251017144924.10034-1-borntraeger@linux.ibm.com> <9beff9d6-47c7-4a65-b320-43efd1e12687@redhat.com> <8c778cd0-5608-4852-9840-4d98828d7b33@redhat.com> <74272098-cfb7-424b-a55e-55e94f04524e@linux.ibm.com> <84349344-b127-41f6-99f1-10f907c2bd07@redhat.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-Stat-Signature: 75affp8k7wa331nzwz9oczwssf9cbfjy X-Rspamd-Queue-Id: EB501C0006 X-Rspamd-Server: rspam09 X-HE-Tag: 1760949694-870064 X-HE-Meta: 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 4xlI2yaP 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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 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; -- Cheers David / dhildenb