* [PATCH v2 1/3] powerpc: Add common pud_pfn stub for all platforms
@ 2022-09-23 6:08 Rohan McLure
2022-09-23 6:08 ` [PATCH v2 2/3] powerpc: mm: add p{te,md,ud}_user_accessible_page helpers Rohan McLure
2022-09-23 6:08 ` [PATCH v2 3/3] powerpc: mm: support page table check Rohan McLure
0 siblings, 2 replies; 5+ messages in thread
From: Rohan McLure @ 2022-09-23 6:08 UTC (permalink / raw)
To: linuxppc-dev; +Cc: Rohan McLure
Prior to this commit, pud_pfn was implemented with BUILD_BUG as the inline
function for 64-bit Book3S systems but is never included, as its
invocations in generic code are guarded by calls to pud_devmap which return
zero on such systems. A future patch will provide support for page table
checks, the generic code for which depends on a pud_pfn stub being
implemented, even while the patch will not interact with puds directly.
Remove the 64-bit Book3S stub and define pud_pfn to warn on all
platforms. pud_pfn may be defined properly on a per-platform basis
should it grow real usages in future.
Signed-off-by: Rohan McLure <rmclure@linux.ibm.com>
---
V2: Remove conditional BUILD_BUG and BUG. Instead warn on usage.
---
arch/powerpc/include/asm/book3s/64/pgtable.h | 10 ----------
arch/powerpc/include/asm/pgtable.h | 14 ++++++++++++++
2 files changed, 14 insertions(+), 10 deletions(-)
diff --git a/arch/powerpc/include/asm/book3s/64/pgtable.h b/arch/powerpc/include/asm/book3s/64/pgtable.h
index 486902aff040..f9aefa492df0 100644
--- a/arch/powerpc/include/asm/book3s/64/pgtable.h
+++ b/arch/powerpc/include/asm/book3s/64/pgtable.h
@@ -1413,16 +1413,6 @@ static inline int pgd_devmap(pgd_t pgd)
}
#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
-static inline int pud_pfn(pud_t pud)
-{
- /*
- * Currently all calls to pud_pfn() are gated around a pud_devmap()
- * check so this should never be used. If it grows another user we
- * want to know about it.
- */
- BUILD_BUG();
- return 0;
-}
#define __HAVE_ARCH_PTEP_MODIFY_PROT_TRANSACTION
pte_t ptep_modify_prot_start(struct vm_area_struct *, unsigned long, pte_t *);
void ptep_modify_prot_commit(struct vm_area_struct *, unsigned long,
diff --git a/arch/powerpc/include/asm/pgtable.h b/arch/powerpc/include/asm/pgtable.h
index 33f4bf8d22b0..36956fb440e1 100644
--- a/arch/powerpc/include/asm/pgtable.h
+++ b/arch/powerpc/include/asm/pgtable.h
@@ -158,6 +158,20 @@ struct seq_file;
void arch_report_meminfo(struct seq_file *m);
#endif /* CONFIG_PPC64 */
+/*
+ * Currently only consumed by page_table_check_pud_{set,clear}. Since clears
+ * and sets to page table entries at any level are done through
+ * page_table_check_pte_{set,clear}, provide stub implementation.
+ */
+#ifndef pud_pfn
+#define pud_pfn pud_pfn
+static inline int pud_pfn(pud_t pud)
+{
+ WARN(1, "pud: platform does not use pud entries directly");
+ return 0;
+}
+#endif
+
#endif /* __ASSEMBLY__ */
#endif /* _ASM_POWERPC_PGTABLE_H */
--
2.34.1
^ permalink raw reply related [flat|nested] 5+ messages in thread* [PATCH v2 2/3] powerpc: mm: add p{te,md,ud}_user_accessible_page helpers 2022-09-23 6:08 [PATCH v2 1/3] powerpc: Add common pud_pfn stub for all platforms Rohan McLure @ 2022-09-23 6:08 ` Rohan McLure 2022-09-23 6:36 ` Christophe Leroy 2022-09-23 6:08 ` [PATCH v2 3/3] powerpc: mm: support page table check Rohan McLure 1 sibling, 1 reply; 5+ messages in thread From: Rohan McLure @ 2022-09-23 6:08 UTC (permalink / raw) To: linuxppc-dev; +Cc: Rohan McLure Add the following helpers for detecting whether a page table entry is a leaf and is accessible to user space. * pte_user_accessible_page * pmd_user_accessible_page * pud_user_accessible_page Also implement missing pud_user definitions for both Book3S/E 64-bit systems. Signed-off-by: Rohan McLure <rmclure@linux.ibm.com> --- V2: Provide missing pud_user implementations, use p{u,m}d_is_leaf. --- arch/powerpc/include/asm/book3s/64/pgtable.h | 10 ++++++ arch/powerpc/include/asm/nohash/64/pgtable.h | 10 ++++++ arch/powerpc/include/asm/pgtable.h | 33 ++++++++++++++++++ 3 files changed, 53 insertions(+) diff --git a/arch/powerpc/include/asm/book3s/64/pgtable.h b/arch/powerpc/include/asm/book3s/64/pgtable.h index f9aefa492df0..3083111f9d0a 100644 --- a/arch/powerpc/include/asm/book3s/64/pgtable.h +++ b/arch/powerpc/include/asm/book3s/64/pgtable.h @@ -621,6 +621,16 @@ static inline bool pte_user(pte_t pte) return !(pte_raw(pte) & cpu_to_be64(_PAGE_PRIVILEGED)); } +static inline bool pmd_user(pmd_t pmd) +{ + return !(pmd_raw(pmd) & cpu_to_be64(_PAGE_PRIVILEGED)); +} + +static inline bool pud_user(pud_t pud) +{ + return !(pud_raw(pud) & cpu_to_be64(_PAGE_PRIVILEGED)); +} + #define pte_access_permitted pte_access_permitted static inline bool pte_access_permitted(pte_t pte, bool write) { diff --git a/arch/powerpc/include/asm/nohash/64/pgtable.h b/arch/powerpc/include/asm/nohash/64/pgtable.h index 599921cc257e..23c5135178d1 100644 --- a/arch/powerpc/include/asm/nohash/64/pgtable.h +++ b/arch/powerpc/include/asm/nohash/64/pgtable.h @@ -123,6 +123,11 @@ static inline pte_t pmd_pte(pmd_t pmd) return __pte(pmd_val(pmd)); } +static inline bool pmd_user(pmd_t pmd) +{ + return (pmd_val(pmd) & _PAGE_USER) == _PAGE_USER; +} + #define pmd_none(pmd) (!pmd_val(pmd)) #define pmd_bad(pmd) (!is_kernel_addr(pmd_val(pmd)) \ || (pmd_val(pmd) & PMD_BAD_BITS)) @@ -158,6 +163,11 @@ static inline pte_t pud_pte(pud_t pud) return __pte(pud_val(pud)); } +static inline bool pud_user(pud_t pud) +{ + return (pud_val(pud) & _PAGE_USER) == _PAGE_USER; +} + static inline pud_t pte_pud(pte_t pte) { return __pud(pte_val(pte)); diff --git a/arch/powerpc/include/asm/pgtable.h b/arch/powerpc/include/asm/pgtable.h index 36956fb440e1..69eed4e03da0 100644 --- a/arch/powerpc/include/asm/pgtable.h +++ b/arch/powerpc/include/asm/pgtable.h @@ -172,6 +172,39 @@ static inline int pud_pfn(pud_t pud) } #endif +static inline bool pte_user_accessible_page(pte_t pte) +{ + return pte_present(pte) && pte_user(pte); +} + +#ifdef CONFIG_PPC64 + +static inline bool pmd_user_accessible_page(pmd_t pmd) +{ + return pmd_is_leaf(pmd) && pmd_present(pmd) && pmd_user(pmd); +} + +static inline bool pud_user_accessible_page(pud_t pud) +{ + return pud_is_leaf(pud) && pud_present(pud) && pud_user(pud); +} + +#else + +static inline bool pmd_user_accessible_page(pmd_t pmd) +{ + WARN(1, "pmd: multi-level paging unsupported on ppc32"); + return false; +} + +static inline bool pud_user_accessible_page(pud_t pud) +{ + WARN(1, "pud: multi-level paging unsupported on ppc32"); + return false; +} + +#endif /* CONFIG_PPC64 */ + #endif /* __ASSEMBLY__ */ #endif /* _ASM_POWERPC_PGTABLE_H */ -- 2.34.1 ^ permalink raw reply related [flat|nested] 5+ messages in thread
* Re: [PATCH v2 2/3] powerpc: mm: add p{te,md,ud}_user_accessible_page helpers 2022-09-23 6:08 ` [PATCH v2 2/3] powerpc: mm: add p{te,md,ud}_user_accessible_page helpers Rohan McLure @ 2022-09-23 6:36 ` Christophe Leroy 0 siblings, 0 replies; 5+ messages in thread From: Christophe Leroy @ 2022-09-23 6:36 UTC (permalink / raw) To: Rohan McLure, linuxppc-dev@lists.ozlabs.org Le 23/09/2022 à 08:08, Rohan McLure a écrit : > Add the following helpers for detecting whether a page table entry > is a leaf and is accessible to user space. > > * pte_user_accessible_page > * pmd_user_accessible_page > * pud_user_accessible_page > > Also implement missing pud_user definitions for both Book3S/E 64-bit > systems. > > Signed-off-by: Rohan McLure <rmclure@linux.ibm.com> > --- > V2: Provide missing pud_user implementations, use p{u,m}d_is_leaf. > --- > diff --git a/arch/powerpc/include/asm/pgtable.h b/arch/powerpc/include/asm/pgtable.h > index 36956fb440e1..69eed4e03da0 100644 > --- a/arch/powerpc/include/asm/pgtable.h > +++ b/arch/powerpc/include/asm/pgtable.h > @@ -172,6 +172,39 @@ static inline int pud_pfn(pud_t pud) > } > #endif > > +static inline bool pte_user_accessible_page(pte_t pte) > +{ > + return pte_present(pte) && pte_user(pte); > +} > + > +#ifdef CONFIG_PPC64 > + > +static inline bool pmd_user_accessible_page(pmd_t pmd) > +{ > + return pmd_is_leaf(pmd) && pmd_present(pmd) && pmd_user(pmd); > +} > + > +static inline bool pud_user_accessible_page(pud_t pud) > +{ > + return pud_is_leaf(pud) && pud_present(pud) && pud_user(pud); > +} > + > +#else > + > +static inline bool pmd_user_accessible_page(pmd_t pmd) > +{ > + WARN(1, "pmd: multi-level paging unsupported on ppc32"); > + return false; > +} > + > +static inline bool pud_user_accessible_page(pud_t pud) > +{ > + WARN(1, "pud: multi-level paging unsupported on ppc32"); > + return false; > +} > + > +#endif /* CONFIG_PPC64 */ > + I can't see the point in this splitted implementation PPC64/PPC32. The warning has no added value from my point of view. And multi-level paging IS supported on PPC32, that's 2 level paging, the PMD is folder into the PGD. pmd_is_leaf() and pud_is_leaf() are PPC64 specific. The following could be common to PPC32 and PPC64: +static inline bool pmd_user_accessible_page(pmd_t pmd) +{ + return pmd_leaf(pmd) && pmd_present(pmd) && pmd_user(pmd); +} + +static inline bool pud_user_accessible_page(pud_t pud) +{ + return pud_leaf(pud) && pud_present(pud) && pud_user(pud); +} + pud_user() is defined in include/asm-generic/pgtable-nopmd.h for PPC32. All you have to do is to define a stub pmd_user() for book3s/32 and nohash/32. > #endif /* __ASSEMBLY__ */ > > #endif /* _ASM_POWERPC_PGTABLE_H */ ^ permalink raw reply [flat|nested] 5+ messages in thread
* [PATCH v2 3/3] powerpc: mm: support page table check 2022-09-23 6:08 [PATCH v2 1/3] powerpc: Add common pud_pfn stub for all platforms Rohan McLure 2022-09-23 6:08 ` [PATCH v2 2/3] powerpc: mm: add p{te,md,ud}_user_accessible_page helpers Rohan McLure @ 2022-09-23 6:08 ` Rohan McLure 2022-09-23 6:39 ` Christophe Leroy 1 sibling, 1 reply; 5+ messages in thread From: Rohan McLure @ 2022-09-23 6:08 UTC (permalink / raw) To: linuxppc-dev; +Cc: Rohan McLure 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 ppc64, and 32-bit platforms implementing Book3S. Change pud_pfn to be a runtime bug rather than a build bug as it is consumed by page_table_check_pud_{clear,set} which are not called. 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") Signed-off-by: Rohan McLure <rmclure@linux.ibm.com> --- V2: Update spacing and types assigned to pte_update calls. --- arch/powerpc/Kconfig | 1 + arch/powerpc/include/asm/book3s/32/pgtable.h | 9 ++++++++- arch/powerpc/include/asm/book3s/64/pgtable.h | 18 +++++++++++++++--- arch/powerpc/include/asm/nohash/32/pgtable.h | 7 ++++++- arch/powerpc/include/asm/nohash/64/pgtable.h | 8 ++++++-- arch/powerpc/include/asm/nohash/pgtable.h | 1 + 6 files changed, 37 insertions(+), 7 deletions(-) diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig index 4c466acdc70d..6c213ac46a92 100644 --- a/arch/powerpc/Kconfig +++ b/arch/powerpc/Kconfig @@ -149,6 +149,7 @@ 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 40041ac713d9..e76aca557d48 100644 --- a/arch/powerpc/include/asm/book3s/32/pgtable.h +++ b/arch/powerpc/include/asm/book3s/32/pgtable.h @@ -53,6 +53,8 @@ #ifndef __ASSEMBLY__ +#include <linux/page_table_check.h> + static inline bool pte_user(pte_t pte) { return pte_val(pte) & _PAGE_USER; @@ -353,7 +355,11 @@ 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 @@ -541,6 +547,7 @@ static inline pte_t pte_modify(pte_t pte, pgprot_t newprot) static inline void __set_pte_at(struct mm_struct *mm, unsigned long addr, pte_t *ptep, pte_t pte, int percpu) { + page_table_check_pte_set(mm, addr, ptep, pte); #if defined(CONFIG_SMP) && !defined(CONFIG_PTE_64BIT) /* First case is 32-bit Hash MMU in SMP mode with 32-bit PTEs. We use the * helper pte_update() which does an atomic update. We need to do that diff --git a/arch/powerpc/include/asm/book3s/64/pgtable.h b/arch/powerpc/include/asm/book3s/64/pgtable.h index 3083111f9d0a..b5c5718d9b90 100644 --- a/arch/powerpc/include/asm/book3s/64/pgtable.h +++ b/arch/powerpc/include/asm/book3s/64/pgtable.h @@ -181,6 +181,8 @@ #define PAGE_AGP (PAGE_KERNEL_NC) #ifndef __ASSEMBLY__ +#include <linux/page_table_check.h> + /* * page table defines */ @@ -484,8 +486,11 @@ 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 @@ -494,11 +499,16 @@ 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); } @@ -884,6 +894,8 @@ static inline void __set_pte_at(struct mm_struct *mm, unsigned long addr, */ pte = __pte_raw(pte_raw(pte) | cpu_to_be64(_PAGE_PTE)); + page_table_check_pte_set(mm, addr, ptep, pte); + if (radix_enabled()) return radix__set_pte_at(mm, addr, ptep, pte, percpu); return hash__set_pte_at(mm, addr, ptep, pte, percpu); diff --git a/arch/powerpc/include/asm/nohash/32/pgtable.h b/arch/powerpc/include/asm/nohash/32/pgtable.h index 9091e4904a6b..45ba36d968aa 100644 --- a/arch/powerpc/include/asm/nohash/32/pgtable.h +++ b/arch/powerpc/include/asm/nohash/32/pgtable.h @@ -166,6 +166,7 @@ void unmap_kernel_page(unsigned long va); #define _PAGE_CHG_MASK (PTE_RPN_MASK | _PAGE_DIRTY | _PAGE_ACCESSED | _PAGE_SPECIAL) #ifndef __ASSEMBLY__ +#include <linux/page_table_check.h> #define pte_clear(mm, addr, ptep) \ do { pte_update(mm, addr, ptep, ~0, 0, 0); } while (0) @@ -305,7 +306,11 @@ 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, ~0, 0, 0)); + unsigned long old = pte_update(mm, addr, ptep, ~0, 0, 0); + + page_table_check_pte_clear(mm, addr, __pte(old)); + + return __pte(old); } #define __HAVE_ARCH_PTEP_SET_WRPROTECT diff --git a/arch/powerpc/include/asm/nohash/64/pgtable.h b/arch/powerpc/include/asm/nohash/64/pgtable.h index 23c5135178d1..adb629d40625 100644 --- a/arch/powerpc/include/asm/nohash/64/pgtable.h +++ b/arch/powerpc/include/asm/nohash/64/pgtable.h @@ -83,6 +83,7 @@ #define H_PAGE_4K_PFN 0 #ifndef __ASSEMBLY__ +#include <linux/page_table_check.h> /* pte_clear moved to later in this file */ static inline pte_t pte_mkwrite(pte_t pte) @@ -253,8 +254,11 @@ 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 pte_old = __pte(pte_update(mm, addr, ptep, ~0UL, 0, 0)); + + page_table_check_pte_clear(mm, addr, pte_old); + + return pte_old; } static inline void pte_clear(struct mm_struct *mm, unsigned long addr, diff --git a/arch/powerpc/include/asm/nohash/pgtable.h b/arch/powerpc/include/asm/nohash/pgtable.h index b499da6c1a99..62b221b7cccf 100644 --- a/arch/powerpc/include/asm/nohash/pgtable.h +++ b/arch/powerpc/include/asm/nohash/pgtable.h @@ -185,6 +185,7 @@ extern void set_pte_at(struct mm_struct *mm, unsigned long addr, pte_t *ptep, static inline void __set_pte_at(struct mm_struct *mm, unsigned long addr, pte_t *ptep, pte_t pte, int percpu) { + page_table_check_pte_set(mm, addr, ptep, pte); /* Second case is 32-bit with 64-bit PTE. In this case, we * can just store as long as we do the two halves in the right order * with a barrier in between. -- 2.34.1 ^ permalink raw reply related [flat|nested] 5+ messages in thread
* Re: [PATCH v2 3/3] powerpc: mm: support page table check 2022-09-23 6:08 ` [PATCH v2 3/3] powerpc: mm: support page table check Rohan McLure @ 2022-09-23 6:39 ` Christophe Leroy 0 siblings, 0 replies; 5+ messages in thread From: Christophe Leroy @ 2022-09-23 6:39 UTC (permalink / raw) To: Rohan McLure, linuxppc-dev@lists.ozlabs.org Le 23/09/2022 à 08:08, Rohan McLure a écrit : > 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 ppc64, and 32-bit > platforms implementing Book3S. > > Change pud_pfn to be a runtime bug rather than a build bug as it is > consumed by page_table_check_pud_{clear,set} which are not called. > > 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") > > Signed-off-by: Rohan McLure <rmclure@linux.ibm.com> > --- > V2: Update spacing and types assigned to pte_update calls > --- > diff --git a/arch/powerpc/include/asm/nohash/32/pgtable.h b/arch/powerpc/include/asm/nohash/32/pgtable.h > index 9091e4904a6b..45ba36d968aa 100644 > --- a/arch/powerpc/include/asm/nohash/32/pgtable.h > +++ b/arch/powerpc/include/asm/nohash/32/pgtable.h > @@ -166,6 +166,7 @@ void unmap_kernel_page(unsigned long va); > #define _PAGE_CHG_MASK (PTE_RPN_MASK | _PAGE_DIRTY | _PAGE_ACCESSED | _PAGE_SPECIAL) > > #ifndef __ASSEMBLY__ > +#include <linux/page_table_check.h> > > #define pte_clear(mm, addr, ptep) \ > do { pte_update(mm, addr, ptep, ~0, 0, 0); } while (0) > @@ -305,7 +306,11 @@ 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, ~0, 0, 0)); > + unsigned long old = pte_update(mm, addr, ptep, ~0, 0, 0); You missed that one, should be pte_t to avoid twice __pte(old) > + > + page_table_check_pte_clear(mm, addr, __pte(old)); > + > + return __pte(old); > } > > #define __HAVE_ARCH_PTEP_SET_WRPROTECT ^ permalink raw reply [flat|nested] 5+ messages in thread
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2022-09-23 6:08 [PATCH v2 1/3] powerpc: Add common pud_pfn stub for all platforms Rohan McLure
2022-09-23 6:08 ` [PATCH v2 2/3] powerpc: mm: add p{te,md,ud}_user_accessible_page helpers Rohan McLure
2022-09-23 6:36 ` Christophe Leroy
2022-09-23 6:08 ` [PATCH v2 3/3] powerpc: mm: support page table check Rohan McLure
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