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Wed, 7 Oct 2026 11:41:59 +0000 (GMT) Received: from tuxmaker.boeblingen.de.ibm.com (unknown [9.87.85.9]) by smtpav04.fra02v.mail.ibm.com (Postfix) with SMTP; Wed, 7 Oct 2026 11:41:59 +0000 (GMT) Received: by tuxmaker.boeblingen.de.ibm.com (Postfix, from userid 55669) id 87FB41609AF; Wed, 07 Oct 2026 13:41:58 +0200 (CEST) From: Alexander Gordeev To: Gerald Schaefer , Heiko Carstens , Christian Borntraeger , Vasily Gorbik , Claudio Imbrenda , Andrey Ryabinin Cc: Muhammad Usama Anjum , linux-s390@vger.kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, kasan-dev@googlegroups.com Subject: [PATCH v8 07/15] mm/kasan: use hw_pte_t for the early shadow PTE table Date: Wed, 7 Oct 2026 13:41:50 +0200 Message-ID: X-Mailer: git-send-email 2.53.0 In-Reply-To: References: Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-TM-AS-GCONF: 00 X-Proofpoint-Reinject: loops=2 maxloops=12 X-Proofpoint-Spam-Info: AW1haW4tMjYxMDA3MDA0NiBTYWx0ZWRfX1qYEKV7bKBha Z6vE427s5TOQaGNcAe02e2yRGioQ0XdpycGCtFbL7iv8DRIvqlCcWBFz4k9wTWPsbwb80mOx/xV 8FOgX7h5x+fMcaa3oPbEEff4Zs6QiRw= X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYxMDA3MDA0NiBTYWx0ZWRfX+jK91lYLDmjG 58/HvuoRRQ/CLPpSgaLnGza4i9FTqyeBXWg11ncIjV+f9fLtyvBW48IIZvtHtdlyL7MrGeehOk+ zW8HNvLoJ6MYjkqUPfdnRpbhWZhIcoiKwbxYCELzHXV+UGjRJD7l76VbS1y+1fBEfbN1MgV3ytl pGKkRmKjSvNlmMUA++CJdD4Emj8mzY2yfDbCYXlH77kn4oTms1L58gB+dK9q2Ncp/CMzL+fNIJp nqVRW3go5AQ9ml3UbBHKElmnccj1TRlw509zKRB0PrkEHYLaH9cRDHOgjgS+eUPsB/6OY/MWdXl LAi7pRl6lCrtg4CaAz1/Gr0ndHoJ0lPkJn3YJ+JKS33o7X7qE/3YnP64qPcTYxsIOBbycWc0Z+I rvMSpDFmnkAZ38UlXyuEVC6Hx97fum6MEq+2FanWbn6xqZUr3xnmOgybx85e2CqhZ1sw/3BnqHm qcfmjBn+9SvTzXpFaNw== X-Proofpoint-GUID: s9S2W-A6tSAdq8XGy8mTE75XRUEWIcqI X-Authority-Analysis: v=2.4 cv=UNRIjyfy c=1 sm=1 tr=0 ts=6ac6300e cx=c_pps a=5BHTudwdYE3Te8bg5FgnPg==:117 a=5BHTudwdYE3Te8bg5FgnPg==:17 a=660iZSQnnn4A:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=U7nrCbtTmkRpXpFmAIza:22 a=7CQSdrXTAAAA:8 a=AO8vZCCDSQ0loUGPtsYA:9 a=a-qgeE7W1pNrGK8U0ZQC:22 X-Proofpoint-ORIG-GUID: FN1Y3Ei1wDooguhmrQWKXB3qRV0x0tJS X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1176,Hydra:6.1.134,FMLib:17.12.100.49 definitions=2026-10-07_04,2026-10-06_03,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 spamscore=0 impostorscore=0 adultscore=0 bulkscore=0 lowpriorityscore=0 phishscore=0 clxscore=1015 priorityscore=1501 suspectscore=0 malwarescore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2609040000 definitions=main-2610070046 From: Muhammad Usama Anjum kasan_early_shadow_pte is a complete PTE table rather than a software PTE value. Declare and define its elements as hw_pte_t so the object uses the PTE table storage type. Read the first element through ptep_get(), which returns the software PTE value expected by note_page_pte(), instead of accessing hw_pte_t storage directly. This also uses the accessor selected by the architecture. No architecture selects ARCH_HAS_HW_PTE_T at this point, so the storage representation remains unchanged. Signed-off-by: Muhammad Usama Anjum --- include/linux/kasan.h | 2 +- mm/kasan/init.c | 2 +- mm/ptdump.c | 2 +- 3 files changed, 3 insertions(+), 3 deletions(-) diff --git a/include/linux/kasan.h b/include/linux/kasan.h index bf233bde68c7..ff41949c0ac0 100644 --- a/include/linux/kasan.h +++ b/include/linux/kasan.h @@ -51,7 +51,7 @@ typedef unsigned int __bitwise kasan_vmalloc_flags_t; #endif =20 extern unsigned char kasan_early_shadow_page[PAGE_SIZE]; -extern pte_t kasan_early_shadow_pte[MAX_PTRS_PER_PTE + PTE_HWTABLE_PTRS]= ; +extern hw_pte_t kasan_early_shadow_pte[MAX_PTRS_PER_PTE + PTE_HWTABLE_PT= RS]; extern pmd_t kasan_early_shadow_pmd[MAX_PTRS_PER_PMD]; extern pud_t kasan_early_shadow_pud[MAX_PTRS_PER_PUD]; extern p4d_t kasan_early_shadow_p4d[MAX_PTRS_PER_P4D]; diff --git a/mm/kasan/init.c b/mm/kasan/init.c index 30c5266eaf37..9bbc2a41d23f 100644 --- a/mm/kasan/init.c +++ b/mm/kasan/init.c @@ -64,7 +64,7 @@ static inline bool kasan_pmd_table(pud_t pud) return false; } #endif -pte_t kasan_early_shadow_pte[MAX_PTRS_PER_PTE + PTE_HWTABLE_PTRS] +hw_pte_t kasan_early_shadow_pte[MAX_PTRS_PER_PTE + PTE_HWTABLE_PTRS] __bss_pgtbl; =20 static inline bool kasan_pte_table(pmd_t pmd) diff --git a/mm/ptdump.c b/mm/ptdump.c index 376880071ca2..8f19f20be3c4 100644 --- a/mm/ptdump.c +++ b/mm/ptdump.c @@ -19,7 +19,7 @@ static inline int note_kasan_page_table(struct mm_walk = *walk, { struct ptdump_state *st =3D walk->private; =20 - st->note_page_pte(st, addr, kasan_early_shadow_pte[0]); + st->note_page_pte(st, addr, ptep_get(kasan_early_shadow_pte)); =20 walk->action =3D ACTION_CONTINUE; =20 --=20 2.53.0