diff options
Diffstat (limited to 'virt/kvm/arm/mmu.c')
| -rw-r--r-- | virt/kvm/arm/mmu.c | 104 |
1 files changed, 98 insertions, 6 deletions
diff --git a/virt/kvm/arm/mmu.c b/virt/kvm/arm/mmu.c index 3893ea6a50bf..2dcff38868d4 100644 --- a/virt/kvm/arm/mmu.c +++ b/virt/kvm/arm/mmu.c @@ -115,6 +115,25 @@ static void stage2_dissolve_pmd(struct kvm *kvm, phys_addr_t addr, pmd_t *pmd) put_page(virt_to_page(pmd)); } +/** + * stage2_dissolve_pud() - clear and flush huge PUD entry + * @kvm: pointer to kvm structure. + * @addr: IPA + * @pud: pud pointer for IPA + * + * Function clears a PUD entry, flushes addr 1st and 2nd stage TLBs. Marks all + * pages in the range dirty. + */ +static void stage2_dissolve_pud(struct kvm *kvm, phys_addr_t addr, pud_t *pudp) +{ + if (!stage2_pud_huge(kvm, *pudp)) + return; + + stage2_pud_clear(kvm, pudp); + kvm_tlb_flush_vmid_ipa(kvm, addr); + put_page(virt_to_page(pudp)); +} + static int mmu_topup_memory_cache(struct kvm_mmu_memory_cache *cache, int min, int max) { @@ -1022,7 +1041,7 @@ static pmd_t *stage2_get_pmd(struct kvm *kvm, struct kvm_mmu_memory_cache *cache pmd_t *pmd; pud = stage2_get_pud(kvm, cache, addr); - if (!pud) + if (!pud || stage2_pud_huge(kvm, *pud)) return NULL; if (stage2_pud_none(kvm, *pud)) { @@ -1083,6 +1102,36 @@ static int stage2_set_pmd_huge(struct kvm *kvm, struct kvm_mmu_memory_cache return 0; } +static int stage2_set_pud_huge(struct kvm *kvm, struct kvm_mmu_memory_cache *cache, + phys_addr_t addr, const pud_t *new_pudp) +{ + pud_t *pudp, old_pud; + + pudp = stage2_get_pud(kvm, cache, addr); + VM_BUG_ON(!pudp); + + old_pud = *pudp; + + /* + * A large number of vcpus faulting on the same stage 2 entry, + * can lead to a refault due to the + * stage2_pud_clear()/tlb_flush(). Skip updating the page + * tables if there is no change. + */ + if (pud_val(old_pud) == pud_val(*new_pudp)) + return 0; + + if (stage2_pud_present(kvm, old_pud)) { + stage2_pud_clear(kvm, pudp); + kvm_tlb_flush_vmid_ipa(kvm, addr); + } else { + get_page(virt_to_page(pudp)); + } + + kvm_set_pud(pudp, *new_pudp); + return 0; +} + /* * stage2_get_leaf_entry - walk the stage2 VM page tables and return * true if a valid and present leaf-entry is found. A pointer to the @@ -1149,6 +1198,7 @@ static int stage2_set_pte(struct kvm *kvm, struct kvm_mmu_memory_cache *cache, phys_addr_t addr, const pte_t *new_pte, unsigned long flags) { + pud_t *pud; pmd_t *pmd; pte_t *pte, old_pte; bool iomap = flags & KVM_S2PTE_FLAG_IS_IOMAP; @@ -1157,7 +1207,31 @@ static int stage2_set_pte(struct kvm *kvm, struct kvm_mmu_memory_cache *cache, VM_BUG_ON(logging_active && !cache); /* Create stage-2 page table mapping - Levels 0 and 1 */ - pmd = stage2_get_pmd(kvm, cache, addr); + pud = stage2_get_pud(kvm, cache, addr); + if (!pud) { + /* + * Ignore calls from kvm_set_spte_hva for unallocated + * address ranges. + */ + return 0; + } + + /* + * While dirty page logging - dissolve huge PUD, then continue + * on to allocate page. + */ + if (logging_active) + stage2_dissolve_pud(kvm, addr, pud); + + if (stage2_pud_none(kvm, *pud)) { + if (!cache) + return 0; /* ignore calls from kvm_set_spte_hva */ + pmd = mmu_memory_cache_alloc(cache); + stage2_pud_populate(kvm, pud, pmd); + get_page(virt_to_page(pud)); + } + + pmd = stage2_pmd_offset(kvm, pud, addr); if (!pmd) { /* * Ignore calls from kvm_set_spte_hva for unallocated @@ -1557,12 +1631,19 @@ static int user_mem_abort(struct kvm_vcpu *vcpu, phys_addr_t fault_ipa, } vma_pagesize = vma_kernel_pagesize(vma); - if (vma_pagesize == PMD_SIZE && !logging_active) { - gfn = (fault_ipa & PMD_MASK) >> PAGE_SHIFT; + /* + * PUD level may not exist for a VM but PMD is guaranteed to + * exist. + */ + if ((vma_pagesize == PMD_SIZE || + (vma_pagesize == PUD_SIZE && kvm_stage2_has_pud(kvm))) && + !logging_active) { + gfn = (fault_ipa & huge_page_mask(hstate_vma(vma))) >> PAGE_SHIFT; } else { /* * Fallback to PTE if it's not one of the Stage 2 - * supported hugepage sizes + * supported hugepage sizes or the corresponding level + * doesn't exist */ vma_pagesize = PAGE_SIZE; @@ -1661,7 +1742,18 @@ static int user_mem_abort(struct kvm_vcpu *vcpu, phys_addr_t fault_ipa, needs_exec = exec_fault || (fault_status == FSC_PERM && stage2_is_exec(kvm, fault_ipa)); - if (vma_pagesize == PMD_SIZE) { + if (vma_pagesize == PUD_SIZE) { + pud_t new_pud = kvm_pfn_pud(pfn, mem_type); + + new_pud = kvm_pud_mkhuge(new_pud); + if (writable) + new_pud = kvm_s2pud_mkwrite(new_pud); + + if (needs_exec) + new_pud = kvm_s2pud_mkexec(new_pud); + + ret = stage2_set_pud_huge(kvm, memcache, fault_ipa, &new_pud); + } else if (vma_pagesize == PMD_SIZE) { pmd_t new_pmd = kvm_pfn_pmd(pfn, mem_type); new_pmd = kvm_pmd_mkhuge(new_pmd); |