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Thu, 28 Mar 2024 04:57:24 +0000 (GMT) Received: from socotra.ibm.com (unknown [9.66.88.97]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ozlabs.au.ibm.com (Postfix) with ESMTPSA id D67A760112; Thu, 28 Mar 2024 15:57:18 +1100 (AEDT) From: Rohan McLure To: linuxppc-dev@lists.ozlabs.org Cc: Rohan McLure , mpe@ellerman.id.au, christophe.leroy@csgroup.eu, linux-mm@kvack.org, linux-riscv@lists.infradead.org, linux-arm-kernel@lists.infradead.org, x86@kernel.org Subject: [PATCH v11 11/11] powerpc: mm: Support page table check Date: Thu, 28 Mar 2024 15:55:31 +1100 Message-ID: <20240328045535.194800-14-rmclure@linux.ibm.com> X-Mailer: git-send-email 2.44.0 In-Reply-To: <20240328045535.194800-3-rmclure@linux.ibm.com> References: <20240328045535.194800-3-rmclure@linux.ibm.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Proofpoint-GUID: ZoK1JV8bt85Eo4bOTNwkAuPLxaU6rIo- X-Proofpoint-ORIG-GUID: ZoK1JV8bt85Eo4bOTNwkAuPLxaU6rIo- X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.272,Aquarius:18.0.1011,Hydra:6.0.619,FMLib:17.11.176.26 definitions=2024-03-28_04,2024-03-27_01,2023-05-22_02 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 malwarescore=0 suspectscore=0 spamscore=0 lowpriorityscore=0 adultscore=0 mlxlogscore=764 bulkscore=0 impostorscore=0 mlxscore=0 clxscore=1015 phishscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2403210000 definitions=main-2403280028 X-Rspamd-Queue-Id: 9D5D118000C X-Rspam-User: X-Rspamd-Server: rspam04 X-Stat-Signature: qieqkuxm5hdeat3srndqpcam3mnwsxqp X-HE-Tag: 1711601860-997875 X-HE-Meta: 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 jE/I/57B hOCmPsdcNqlw88bIeaFB1KlVHbw== 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 creation and clearing of a page table mapping, instrument such calls by invoking page_table_check_pte_set and page_table_check_pte_clear respectively. These calls serve as a sanity check against illegal mappings. Enable ARCH_SUPPORTS_PAGE_TABLE_CHECK for all platforms. See also: riscv support in commit 3fee229a8eb9 ("riscv/mm: enable ARCH_SUPPORTS_PAGE_TABLE_CHECK") arm64 in commit 42b2547137f5 ("arm64/mm: enable ARCH_SUPPORTS_PAGE_TABLE_CHECK") x86_64 in commit d283d422c6c4 ("x86: mm: add x86_64 support for page table check") Reviewed-by: Christophe Leroy Signed-off-by: Rohan McLure --- v9: Updated for new API. Instrument pmdp_collapse_flush's two constituent calls to avoid header hell v10: Cause p{u,m}dp_huge_get_and_clear() to resemble one another --- arch/powerpc/Kconfig | 1 + arch/powerpc/include/asm/book3s/32/pgtable.h | 7 ++- arch/powerpc/include/asm/book3s/64/pgtable.h | 45 +++++++++++++++----- arch/powerpc/mm/book3s64/hash_pgtable.c | 4 ++ arch/powerpc/mm/book3s64/pgtable.c | 11 +++-- arch/powerpc/mm/book3s64/radix_pgtable.c | 3 ++ arch/powerpc/mm/pgtable.c | 4 ++ 7 files changed, 61 insertions(+), 14 deletions(-) diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig index a68b9e637eda..66a72f9078f5 100644 --- a/arch/powerpc/Kconfig +++ b/arch/powerpc/Kconfig @@ -166,6 +166,7 @@ config PPC select ARCH_STACKWALK select ARCH_SUPPORTS_ATOMIC_RMW select ARCH_SUPPORTS_DEBUG_PAGEALLOC if PPC_BOOK3S || PPC_8xx || 40x + select ARCH_SUPPORTS_PAGE_TABLE_CHECK select ARCH_USE_BUILTIN_BSWAP select ARCH_USE_CMPXCHG_LOCKREF if PPC64 select ARCH_USE_MEMTEST diff --git a/arch/powerpc/include/asm/book3s/32/pgtable.h b/arch/powerpc/include/asm/book3s/32/pgtable.h index 83f7b98ef49f..703deb5749e6 100644 --- a/arch/powerpc/include/asm/book3s/32/pgtable.h +++ b/arch/powerpc/include/asm/book3s/32/pgtable.h @@ -201,6 +201,7 @@ void unmap_kernel_page(unsigned long va); #ifndef __ASSEMBLY__ #include #include +#include /* Bits to mask out from a PGD to get to the PUD page */ #define PGD_MASKED_BITS 0 @@ -314,7 +315,11 @@ static inline int __ptep_test_and_clear_young(struct mm_struct *mm, static inline pte_t ptep_get_and_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep) { - return __pte(pte_update(mm, addr, ptep, ~_PAGE_HASHPTE, 0, 0)); + pte_t old_pte = __pte(pte_update(mm, addr, ptep, ~_PAGE_HASHPTE, 0, 0)); + + page_table_check_pte_clear(mm, addr, old_pte); + + return old_pte; } #define __HAVE_ARCH_PTEP_SET_WRPROTECT diff --git a/arch/powerpc/include/asm/book3s/64/pgtable.h b/arch/powerpc/include/asm/book3s/64/pgtable.h index d8640ddbcad1..6199d2b4bded 100644 --- a/arch/powerpc/include/asm/book3s/64/pgtable.h +++ b/arch/powerpc/include/asm/book3s/64/pgtable.h @@ -145,6 +145,8 @@ #define PAGE_KERNEL_ROX __pgprot(_PAGE_BASE | _PAGE_KERNEL_ROX) #ifndef __ASSEMBLY__ +#include + /* * page table defines */ @@ -415,8 +417,11 @@ static inline void huge_ptep_set_wrprotect(struct mm_struct *mm, static inline pte_t ptep_get_and_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep) { - unsigned long old = pte_update(mm, addr, ptep, ~0UL, 0, 0); - return __pte(old); + pte_t old_pte = __pte(pte_update(mm, addr, ptep, ~0UL, 0, 0)); + + page_table_check_pte_clear(mm, addr, old_pte); + + return old_pte; } #define __HAVE_ARCH_PTEP_GET_AND_CLEAR_FULL @@ -425,11 +430,16 @@ static inline pte_t ptep_get_and_clear_full(struct mm_struct *mm, pte_t *ptep, int full) { if (full && radix_enabled()) { + pte_t old_pte; + /* * We know that this is a full mm pte clear and * hence can be sure there is no parallel set_pte. */ - return radix__ptep_get_and_clear_full(mm, addr, ptep, full); + old_pte = radix__ptep_get_and_clear_full(mm, addr, ptep, full); + page_table_check_pte_clear(mm, addr, old_pte); + + return old_pte; } return ptep_get_and_clear(mm, addr, ptep); } @@ -1306,19 +1316,34 @@ extern int pudp_test_and_clear_young(struct vm_area_struct *vma, static inline pmd_t pmdp_huge_get_and_clear(struct mm_struct *mm, unsigned long addr, pmd_t *pmdp) { - if (radix_enabled()) - return radix__pmdp_huge_get_and_clear(mm, addr, pmdp); - return hash__pmdp_huge_get_and_clear(mm, addr, pmdp); + pmd_t old_pmd; + + if (radix_enabled()) { + old_pmd = radix__pmdp_huge_get_and_clear(mm, addr, pmdp); + } else { + old_pmd = hash__pmdp_huge_get_and_clear(mm, addr, pmdp); + } + + page_table_check_pmd_clear(mm, addr, old_pmd); + + return old_pmd; } #define __HAVE_ARCH_PUDP_HUGE_GET_AND_CLEAR static inline pud_t pudp_huge_get_and_clear(struct mm_struct *mm, unsigned long addr, pud_t *pudp) { - if (radix_enabled()) - return radix__pudp_huge_get_and_clear(mm, addr, pudp); - BUG(); - return *pudp; + pud_t old_pud; + + if (radix_enabled()) { + old_pud = radix__pudp_huge_get_and_clear(mm, addr, pudp); + } else { + BUG(); + } + + page_table_check_pud_clear(mm, addr, old_pud); + + return old_pud; } static inline pmd_t pmdp_collapse_flush(struct vm_area_struct *vma, diff --git a/arch/powerpc/mm/book3s64/hash_pgtable.c b/arch/powerpc/mm/book3s64/hash_pgtable.c index 871472f99a01..f200d55c35d8 100644 --- a/arch/powerpc/mm/book3s64/hash_pgtable.c +++ b/arch/powerpc/mm/book3s64/hash_pgtable.c @@ -8,6 +8,7 @@ #include #include #include +#include #include #include @@ -231,6 +232,9 @@ pmd_t hash__pmdp_collapse_flush(struct vm_area_struct *vma, unsigned long addres pmd = *pmdp; pmd_clear(pmdp); + + page_table_check_pmd_clear(vma->vm_mm, address, pmd); + /* * Wait for all pending hash_page to finish. This is needed * in case of subpage collapse. When we collapse normal pages diff --git a/arch/powerpc/mm/book3s64/pgtable.c b/arch/powerpc/mm/book3s64/pgtable.c index f7be5fa058e8..171e20e69441 100644 --- a/arch/powerpc/mm/book3s64/pgtable.c +++ b/arch/powerpc/mm/book3s64/pgtable.c @@ -10,6 +10,7 @@ #include #include #include +#include #include #include @@ -116,6 +117,7 @@ void set_pmd_at(struct mm_struct *mm, unsigned long addr, WARN_ON(!(pmd_leaf(pmd))); #endif trace_hugepage_set_pmd(addr, pmd_val(pmd)); + page_table_check_pmd_set(mm, addr, pmdp, pmd); return set_pte_at_unchecked(mm, addr, pmdp_ptep(pmdp), pmd_pte(pmd)); } @@ -133,6 +135,7 @@ void set_pud_at(struct mm_struct *mm, unsigned long addr, WARN_ON(!(pud_leaf(pud))); #endif trace_hugepage_set_pud(addr, pud_val(pud)); + page_table_check_pud_set(mm, addr, pudp, pud); return set_pte_at_unchecked(mm, addr, pudp_ptep(pudp), pud_pte(pud)); } @@ -168,11 +171,13 @@ void serialize_against_pte_lookup(struct mm_struct *mm) pmd_t pmdp_invalidate(struct vm_area_struct *vma, unsigned long address, pmd_t *pmdp) { - unsigned long old_pmd; + pmd_t old_pmd; - old_pmd = pmd_hugepage_update(vma->vm_mm, address, pmdp, _PAGE_PRESENT, _PAGE_INVALID); + old_pmd = __pmd(pmd_hugepage_update(vma->vm_mm, address, pmdp, _PAGE_PRESENT, _PAGE_INVALID)); flush_pmd_tlb_range(vma, address, address + HPAGE_PMD_SIZE); - return __pmd(old_pmd); + page_table_check_pmd_clear(vma->vm_mm, address, old_pmd); + + return old_pmd; } pmd_t pmdp_huge_get_and_clear_full(struct vm_area_struct *vma, diff --git a/arch/powerpc/mm/book3s64/radix_pgtable.c b/arch/powerpc/mm/book3s64/radix_pgtable.c index e8da30536bd5..5e777a462a96 100644 --- a/arch/powerpc/mm/book3s64/radix_pgtable.c +++ b/arch/powerpc/mm/book3s64/radix_pgtable.c @@ -14,6 +14,7 @@ #include #include #include +#include #include #include #include @@ -1390,6 +1391,8 @@ pmd_t radix__pmdp_collapse_flush(struct vm_area_struct *vma, unsigned long addre pmd = *pmdp; pmd_clear(pmdp); + page_table_check_pmd_clear(vma->vm_mm, address, pmd); + radix__flush_tlb_collapsed_pmd(vma->vm_mm, address); return pmd; diff --git a/arch/powerpc/mm/pgtable.c b/arch/powerpc/mm/pgtable.c index 1e3bd1861b71..1a5c18bd8508 100644 --- a/arch/powerpc/mm/pgtable.c +++ b/arch/powerpc/mm/pgtable.c @@ -22,6 +22,7 @@ #include #include #include +#include #include #include #include @@ -206,6 +207,9 @@ void set_ptes(struct mm_struct *mm, unsigned long addr, pte_t *ptep, * and not hw_valid ptes. Hence there is no translation cache flush * involved that need to be batched. */ + + page_table_check_ptes_set(mm, addr, ptep, pte, nr); + for (;;) { /* -- 2.44.0