From 0cbe3e26abe0cfe7effb67f620a77d46cce628b2 Mon Sep 17 00:00:00 2001 From: "Aneesh Kumar K.V" Date: Tue, 5 Mar 2019 15:46:26 -0800 Subject: mm: update ptep_modify_prot_start/commit to take vm_area_struct as arg Patch series "NestMMU pte upgrade workaround for mprotect", v5. We can upgrade pte access (R -> RW transition) via mprotect. We need to make sure we follow the recommended pte update sequence as outlined in commit bd5050e38aec ("powerpc/mm/radix: Change pte relax sequence to handle nest MMU hang") for such updates. This patch series does that. This patch (of 5): Some architectures may want to call flush_tlb_range from these helpers. Link: http://lkml.kernel.org/r/20190116085035.29729-2-aneesh.kumar@linux.ibm.com Signed-off-by: Aneesh Kumar K.V Cc: Nicholas Piggin Cc: Benjamin Herrenschmidt Cc: Paul Mackerras Cc: Michael Ellerman Cc: Heiko Carstens Cc: Martin Schwidefsky Cc: Ingo Molnar Cc: "H. Peter Anvin" Cc: Thomas Gleixner Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- arch/s390/include/asm/pgtable.h | 4 ++-- arch/s390/mm/pgtable.c | 6 ++++-- arch/x86/include/asm/paravirt.h | 11 ++++++----- arch/x86/include/asm/paravirt_types.h | 5 +++-- arch/x86/xen/mmu.h | 4 ++-- arch/x86/xen/mmu_pv.c | 8 ++++---- 6 files changed, 21 insertions(+), 17 deletions(-) (limited to 'arch') diff --git a/arch/s390/include/asm/pgtable.h b/arch/s390/include/asm/pgtable.h index 063732414dfb..5d730199e37b 100644 --- a/arch/s390/include/asm/pgtable.h +++ b/arch/s390/include/asm/pgtable.h @@ -1069,8 +1069,8 @@ static inline pte_t ptep_get_and_clear(struct mm_struct *mm, } #define __HAVE_ARCH_PTEP_MODIFY_PROT_TRANSACTION -pte_t ptep_modify_prot_start(struct mm_struct *, unsigned long, pte_t *); -void ptep_modify_prot_commit(struct mm_struct *, unsigned long, pte_t *, pte_t); +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, pte_t *, pte_t); #define __HAVE_ARCH_PTEP_CLEAR_FLUSH static inline pte_t ptep_clear_flush(struct vm_area_struct *vma, diff --git a/arch/s390/mm/pgtable.c b/arch/s390/mm/pgtable.c index 689b66f29fc6..71aa01170768 100644 --- a/arch/s390/mm/pgtable.c +++ b/arch/s390/mm/pgtable.c @@ -301,12 +301,13 @@ pte_t ptep_xchg_lazy(struct mm_struct *mm, unsigned long addr, } EXPORT_SYMBOL(ptep_xchg_lazy); -pte_t ptep_modify_prot_start(struct mm_struct *mm, unsigned long addr, +pte_t ptep_modify_prot_start(struct vm_area_struct *vma, unsigned long addr, pte_t *ptep) { pgste_t pgste; pte_t old; int nodat; + struct mm_struct *mm = vma->vm_mm; preempt_disable(); pgste = ptep_xchg_start(mm, addr, ptep); @@ -319,10 +320,11 @@ pte_t ptep_modify_prot_start(struct mm_struct *mm, unsigned long addr, return old; } -void ptep_modify_prot_commit(struct mm_struct *mm, unsigned long addr, +void ptep_modify_prot_commit(struct vm_area_struct *vma, unsigned long addr, pte_t *ptep, pte_t pte) { pgste_t pgste; + struct mm_struct *mm = vma->vm_mm; if (!MACHINE_HAS_NX) pte_val(pte) &= ~_PAGE_NOEXEC; diff --git a/arch/x86/include/asm/paravirt.h b/arch/x86/include/asm/paravirt.h index a97f28d914d5..c5a7f18cce7e 100644 --- a/arch/x86/include/asm/paravirt.h +++ b/arch/x86/include/asm/paravirt.h @@ -422,25 +422,26 @@ static inline pgdval_t pgd_val(pgd_t pgd) } #define __HAVE_ARCH_PTEP_MODIFY_PROT_TRANSACTION -static inline pte_t ptep_modify_prot_start(struct mm_struct *mm, unsigned long addr, +static inline pte_t ptep_modify_prot_start(struct vm_area_struct *vma, unsigned long addr, pte_t *ptep) { pteval_t ret; - ret = PVOP_CALL3(pteval_t, mmu.ptep_modify_prot_start, mm, addr, ptep); + ret = PVOP_CALL3(pteval_t, mmu.ptep_modify_prot_start, vma, addr, ptep); return (pte_t) { .pte = ret }; } -static inline void ptep_modify_prot_commit(struct mm_struct *mm, unsigned long addr, +static inline void ptep_modify_prot_commit(struct vm_area_struct *vma, unsigned long addr, pte_t *ptep, pte_t pte) { + if (sizeof(pteval_t) > sizeof(long)) /* 5 arg words */ - pv_ops.mmu.ptep_modify_prot_commit(mm, addr, ptep, pte); + pv_ops.mmu.ptep_modify_prot_commit(vma, addr, ptep, pte); else PVOP_VCALL4(mmu.ptep_modify_prot_commit, - mm, addr, ptep, pte.pte); + vma, addr, ptep, pte.pte); } static inline void set_pte(pte_t *ptep, pte_t pte) diff --git a/arch/x86/include/asm/paravirt_types.h b/arch/x86/include/asm/paravirt_types.h index 488c59686a73..2474e434a6f7 100644 --- a/arch/x86/include/asm/paravirt_types.h +++ b/arch/x86/include/asm/paravirt_types.h @@ -55,6 +55,7 @@ struct task_struct; struct cpumask; struct flush_tlb_info; struct mmu_gather; +struct vm_area_struct; /* * Wrapper type for pointers to code which uses the non-standard @@ -254,9 +255,9 @@ struct pv_mmu_ops { pte_t *ptep, pte_t pteval); void (*set_pmd)(pmd_t *pmdp, pmd_t pmdval); - pte_t (*ptep_modify_prot_start)(struct mm_struct *mm, unsigned long addr, + pte_t (*ptep_modify_prot_start)(struct vm_area_struct *vma, unsigned long addr, pte_t *ptep); - void (*ptep_modify_prot_commit)(struct mm_struct *mm, unsigned long addr, + void (*ptep_modify_prot_commit)(struct vm_area_struct *vma, unsigned long addr, pte_t *ptep, pte_t pte); struct paravirt_callee_save pte_val; diff --git a/arch/x86/xen/mmu.h b/arch/x86/xen/mmu.h index a7e47cf7ec6c..6e4c6bd62203 100644 --- a/arch/x86/xen/mmu.h +++ b/arch/x86/xen/mmu.h @@ -17,8 +17,8 @@ bool __set_phys_to_machine(unsigned long pfn, unsigned long mfn); void set_pte_mfn(unsigned long vaddr, unsigned long pfn, pgprot_t flags); -pte_t xen_ptep_modify_prot_start(struct mm_struct *mm, unsigned long addr, pte_t *ptep); -void xen_ptep_modify_prot_commit(struct mm_struct *mm, unsigned long addr, +pte_t xen_ptep_modify_prot_start(struct vm_area_struct *vma, unsigned long addr, pte_t *ptep); +void xen_ptep_modify_prot_commit(struct vm_area_struct *vma, unsigned long addr, pte_t *ptep, pte_t pte); unsigned long xen_read_cr2_direct(void); diff --git a/arch/x86/xen/mmu_pv.c b/arch/x86/xen/mmu_pv.c index 0f4fe206dcc2..856a85814f00 100644 --- a/arch/x86/xen/mmu_pv.c +++ b/arch/x86/xen/mmu_pv.c @@ -306,20 +306,20 @@ static void xen_set_pte_at(struct mm_struct *mm, unsigned long addr, __xen_set_pte(ptep, pteval); } -pte_t xen_ptep_modify_prot_start(struct mm_struct *mm, +pte_t xen_ptep_modify_prot_start(struct vm_area_struct *vma, unsigned long addr, pte_t *ptep) { /* Just return the pte as-is. We preserve the bits on commit */ - trace_xen_mmu_ptep_modify_prot_start(mm, addr, ptep, *ptep); + trace_xen_mmu_ptep_modify_prot_start(vma->vm_mm, addr, ptep, *ptep); return *ptep; } -void xen_ptep_modify_prot_commit(struct mm_struct *mm, unsigned long addr, +void xen_ptep_modify_prot_commit(struct vm_area_struct *vma, unsigned long addr, pte_t *ptep, pte_t pte) { struct mmu_update u; - trace_xen_mmu_ptep_modify_prot_commit(mm, addr, ptep, pte); + trace_xen_mmu_ptep_modify_prot_commit(vma->vm_mm, addr, ptep, pte); xen_mc_batch(); u.ptr = virt_to_machine(ptep).maddr | MMU_PT_UPDATE_PRESERVE_AD; -- cgit v1.2.3-59-g8ed1b