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author | Paolo Bonzini <pbonzini@redhat.com> | 2016-03-09 11:50:42 +0100 |
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committer | Paolo Bonzini <pbonzini@redhat.com> | 2016-03-09 11:50:42 +0100 |
commit | ab92f30875a7ec3e84644a5494febd8901e66742 (patch) | |
tree | 5254eb36b20b0d1c584c15d0bf3d6a5a9c1bb451 /arch/powerpc/mm | |
parent | bb9eadf0c35f2e7eb5ca6468f46ebb7473b85537 (diff) | |
parent | b40c4892d175874d118860c8282a85ee7b64bcbb (diff) | |
download | op-kernel-dev-ab92f30875a7ec3e84644a5494febd8901e66742.zip op-kernel-dev-ab92f30875a7ec3e84644a5494febd8901e66742.tar.gz |
Merge tag 'kvm-arm-for-4.6' of git://git.kernel.org/pub/scm/linux/kernel/git/kvmarm/kvmarm into HEAD
KVM/ARM updates for 4.6
- VHE support so that we can run the kernel at EL2 on ARMv8.1 systems
- PMU support for guests
- 32bit world switch rewritten in C
- Various optimizations to the vgic save/restore code
Conflicts:
include/uapi/linux/kvm.h
Diffstat (limited to 'arch/powerpc/mm')
-rw-r--r-- | arch/powerpc/mm/hash64_64k.c | 8 | ||||
-rw-r--r-- | arch/powerpc/mm/hugepage-hash64.c | 12 | ||||
-rw-r--r-- | arch/powerpc/mm/mmap.c | 4 | ||||
-rw-r--r-- | arch/powerpc/mm/pgtable_64.c | 32 |
4 files changed, 52 insertions, 4 deletions
diff --git a/arch/powerpc/mm/hash64_64k.c b/arch/powerpc/mm/hash64_64k.c index 0762c1e..edb0991 100644 --- a/arch/powerpc/mm/hash64_64k.c +++ b/arch/powerpc/mm/hash64_64k.c @@ -111,7 +111,13 @@ int __hash_page_4K(unsigned long ea, unsigned long access, unsigned long vsid, */ if (!(old_pte & _PAGE_COMBO)) { flush_hash_page(vpn, rpte, MMU_PAGE_64K, ssize, flags); - old_pte &= ~_PAGE_HASHPTE | _PAGE_F_GIX | _PAGE_F_SECOND; + /* + * clear the old slot details from the old and new pte. + * On hash insert failure we use old pte value and we don't + * want slot information there if we have a insert failure. + */ + old_pte &= ~(_PAGE_HASHPTE | _PAGE_F_GIX | _PAGE_F_SECOND); + new_pte &= ~(_PAGE_HASHPTE | _PAGE_F_GIX | _PAGE_F_SECOND); goto htab_insert_hpte; } /* diff --git a/arch/powerpc/mm/hugepage-hash64.c b/arch/powerpc/mm/hugepage-hash64.c index 49b152b..eb2accd 100644 --- a/arch/powerpc/mm/hugepage-hash64.c +++ b/arch/powerpc/mm/hugepage-hash64.c @@ -78,9 +78,19 @@ int __hash_page_thp(unsigned long ea, unsigned long access, unsigned long vsid, * base page size. This is because demote_segment won't flush * hash page table entries. */ - if ((old_pmd & _PAGE_HASHPTE) && !(old_pmd & _PAGE_COMBO)) + if ((old_pmd & _PAGE_HASHPTE) && !(old_pmd & _PAGE_COMBO)) { flush_hash_hugepage(vsid, ea, pmdp, MMU_PAGE_64K, ssize, flags); + /* + * With THP, we also clear the slot information with + * respect to all the 64K hash pte mapping the 16MB + * page. They are all invalid now. This make sure we + * don't find the slot valid when we fault with 4k + * base page size. + * + */ + memset(hpte_slot_array, 0, PTE_FRAG_SIZE); + } } valid = hpte_valid(hpte_slot_array, index); diff --git a/arch/powerpc/mm/mmap.c b/arch/powerpc/mm/mmap.c index 0f0502e..4087705 100644 --- a/arch/powerpc/mm/mmap.c +++ b/arch/powerpc/mm/mmap.c @@ -59,9 +59,9 @@ unsigned long arch_mmap_rnd(void) /* 8MB for 32bit, 1GB for 64bit */ if (is_32bit_task()) - rnd = (unsigned long)get_random_int() % (1<<(23-PAGE_SHIFT)); + rnd = get_random_long() % (1<<(23-PAGE_SHIFT)); else - rnd = (unsigned long)get_random_int() % (1<<(30-PAGE_SHIFT)); + rnd = get_random_long() % (1UL<<(30-PAGE_SHIFT)); return rnd << PAGE_SHIFT; } diff --git a/arch/powerpc/mm/pgtable_64.c b/arch/powerpc/mm/pgtable_64.c index 3124a20..cdf2123 100644 --- a/arch/powerpc/mm/pgtable_64.c +++ b/arch/powerpc/mm/pgtable_64.c @@ -646,6 +646,28 @@ pgtable_t pgtable_trans_huge_withdraw(struct mm_struct *mm, pmd_t *pmdp) return pgtable; } +void pmdp_huge_split_prepare(struct vm_area_struct *vma, + unsigned long address, pmd_t *pmdp) +{ + VM_BUG_ON(address & ~HPAGE_PMD_MASK); + VM_BUG_ON(REGION_ID(address) != USER_REGION_ID); + + /* + * We can't mark the pmd none here, because that will cause a race + * against exit_mmap. We need to continue mark pmd TRANS HUGE, while + * we spilt, but at the same time we wan't rest of the ppc64 code + * not to insert hash pte on this, because we will be modifying + * the deposited pgtable in the caller of this function. Hence + * clear the _PAGE_USER so that we move the fault handling to + * higher level function and that will serialize against ptl. + * We need to flush existing hash pte entries here even though, + * the translation is still valid, because we will withdraw + * pgtable_t after this. + */ + pmd_hugepage_update(vma->vm_mm, address, pmdp, _PAGE_USER, 0); +} + + /* * set a new huge pmd. We should not be called for updating * an existing pmd entry. That should go via pmd_hugepage_update. @@ -663,10 +685,20 @@ void set_pmd_at(struct mm_struct *mm, unsigned long addr, return set_pte_at(mm, addr, pmdp_ptep(pmdp), pmd_pte(pmd)); } +/* + * We use this to invalidate a pmdp entry before switching from a + * hugepte to regular pmd entry. + */ void pmdp_invalidate(struct vm_area_struct *vma, unsigned long address, pmd_t *pmdp) { pmd_hugepage_update(vma->vm_mm, address, pmdp, _PAGE_PRESENT, 0); + + /* + * This ensures that generic code that rely on IRQ disabling + * to prevent a parallel THP split work as expected. + */ + kick_all_cpus_sync(); } /* |