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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 bd5050e38a ("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 <aneesh.kumar@linux.ibm.com>
Cc: Nicholas Piggin <npiggin@gmail.com>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Aneesh Kumar K.V 2019-03-05 15:46:26 -08:00 committed by Linus Torvalds
parent 8bb4e7a2ee
commit 0cbe3e26ab
10 changed files with 35 additions and 31 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
arch/s390/include/asm/pgtable.h
View File

@ -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,

6
arch/s390/mm/pgtable.c
View File

@ -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;

11
arch/x86/include/asm/paravirt.h
View File

@ -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)

5
arch/x86/include/asm/paravirt_types.h
View File

@ -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;

4
arch/x86/xen/mmu.h
View File

@ -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);

8
arch/x86/xen/mmu_pv.c
View File

@ -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;

4
fs/proc/task_mmu.c
View File

@ -948,10 +948,10 @@ static inline void clear_soft_dirty(struct vm_area_struct *vma,
pte_t ptent = *pte;
if (pte_present(ptent)) {
ptent = ptep_modify_prot_start(vma->vm_mm, addr, pte);
ptent = ptep_modify_prot_start(vma, addr, pte);
ptent = pte_wrprotect(ptent);
ptent = pte_clear_soft_dirty(ptent);
ptep_modify_prot_commit(vma->vm_mm, addr, pte, ptent);
ptep_modify_prot_commit(vma, addr, pte, ptent);
} else if (is_swap_pte(ptent)) {
ptent = pte_swp_clear_soft_dirty(ptent);
set_pte_at(vma->vm_mm, addr, pte, ptent);

16
include/asm-generic/pgtable.h
View File

@ -606,7 +606,7 @@ static inline int pmd_none_or_clear_bad(pmd_t *pmd)
return 0;
}
static inline pte_t __ptep_modify_prot_start(struct mm_struct *mm,
static inline pte_t __ptep_modify_prot_start(struct vm_area_struct *vma,
unsigned long addr,
pte_t *ptep)
{
@ -615,10 +615,10 @@ static inline pte_t __ptep_modify_prot_start(struct mm_struct *mm,
* non-present, preventing the hardware from asynchronously
* updating it.
*/
return ptep_get_and_clear(mm, addr, ptep);
return ptep_get_and_clear(vma->vm_mm, addr, ptep);
}
static inline void __ptep_modify_prot_commit(struct mm_struct *mm,
static inline void __ptep_modify_prot_commit(struct vm_area_struct *vma,
unsigned long addr,
pte_t *ptep, pte_t pte)
{
@ -626,7 +626,7 @@ static inline void __ptep_modify_prot_commit(struct mm_struct *mm,
* The pte is non-present, so there's no hardware state to
* preserve.
*/
set_pte_at(mm, addr, ptep, pte);
set_pte_at(vma->vm_mm, addr, ptep, pte);
}
#ifndef __HAVE_ARCH_PTEP_MODIFY_PROT_TRANSACTION
@ -644,22 +644,22 @@ static inline void __ptep_modify_prot_commit(struct mm_struct *mm,
* queue the update to be done at some later time. The update must be
* actually committed before the pte lock is released, however.
*/
static inline pte_t ptep_modify_prot_start(struct mm_struct *mm,
static inline pte_t ptep_modify_prot_start(struct vm_area_struct *vma,
unsigned long addr,
pte_t *ptep)
{
return __ptep_modify_prot_start(mm, addr, ptep);
return __ptep_modify_prot_start(vma, addr, ptep);
}
/*
* Commit an update to a pte, leaving any hardware-controlled bits in
* the PTE unmodified.
*/
static inline void ptep_modify_prot_commit(struct mm_struct *mm,
static inline void ptep_modify_prot_commit(struct vm_area_struct *vma,
unsigned long addr,
pte_t *ptep, pte_t pte)
{
__ptep_modify_prot_commit(mm, addr, ptep, pte);
__ptep_modify_prot_commit(vma, addr, ptep, pte);
}
#endif /* __HAVE_ARCH_PTEP_MODIFY_PROT_TRANSACTION */
#endif /* CONFIG_MMU */

4
mm/memory.c
View File

@ -3619,12 +3619,12 @@ static vm_fault_t do_numa_page(struct vm_fault *vmf)
* Make it present again, Depending on how arch implementes non
* accessible ptes, some can allow access by kernel mode.
*/
pte = ptep_modify_prot_start(vma->vm_mm, vmf->address, vmf->pte);
pte = ptep_modify_prot_start(vma, vmf->address, vmf->pte);
pte = pte_modify(pte, vma->vm_page_prot);
pte = pte_mkyoung(pte);
if (was_writable)
pte = pte_mkwrite(pte);
ptep_modify_prot_commit(vma->vm_mm, vmf->address, vmf->pte, pte);
ptep_modify_prot_commit(vma, vmf->address, vmf->pte, pte);
update_mmu_cache(vma, vmf->address, vmf->pte);
page = vm_normal_page(vma, vmf->address, pte);

4
mm/mprotect.c
View File

@ -110,7 +110,7 @@ static unsigned long change_pte_range(struct vm_area_struct *vma, pmd_t *pmd,
continue;
}
ptent = ptep_modify_prot_start(mm, addr, pte);
ptent = ptep_modify_prot_start(vma, addr, pte);
ptent = pte_modify(ptent, newprot);
if (preserve_write)
ptent = pte_mk_savedwrite(ptent);
@ -121,7 +121,7 @@ static unsigned long change_pte_range(struct vm_area_struct *vma, pmd_t *pmd,
!(vma->vm_flags & VM_SOFTDIRTY))) {
ptent = pte_mkwrite(ptent);
}
ptep_modify_prot_commit(mm, addr, pte, ptent);
ptep_modify_prot_commit(vma, addr, pte, ptent);
pages++;
} else if (IS_ENABLED(CONFIG_MIGRATION)) {
swp_entry_t entry = pte_to_swp_entry(oldpte);