[PATCH] KVM: MMU: Remove release_pt_page_64()

[powerpc.git] / drivers / kvm / mmu.c

diff --git a/drivers/kvm/mmu.c b/drivers/kvm/mmu.c
index d788866..53c3643 100644 (file)
--- a/drivers/kvm/mmu.c
+++ b/drivers/kvm/mmu.c
@@ -310,6 +310,7 @@ static void kvm_mmu_free_page(struct kvm_vcpu *vcpu, hpa_t page_hpa)
        list_del(&page_head->link);
        page_head->page_hpa = page_hpa;
        list_add(&page_head->link, &vcpu->free_pages);
+       ++vcpu->kvm->n_free_mmu_pages;
 }
 
 static int is_empty_shadow_page(hpa_t page_hpa)
@@ -344,6 +345,7 @@ static struct kvm_mmu_page *kvm_mmu_alloc_page(struct kvm_vcpu *vcpu,
        page->global = 1;
        page->multimapped = 0;
        page->parent_pte = parent_pte;
+       --vcpu->kvm->n_free_mmu_pages;
        return page;
 }
 
@@ -544,8 +546,7 @@ static void kvm_mmu_zap_page(struct kvm_vcpu *vcpu,
        }
        kvm_mmu_page_unlink_children(vcpu, page);
        hlist_del(&page->hash_link);
-       list_del(&page->link);
-       list_add(&page->link, &vcpu->free_pages);
+       kvm_mmu_free_page(vcpu, page->page_hpa);
 }
 
 static int kvm_mmu_unprotect_page(struct kvm_vcpu *vcpu, gfn_t gfn)
@@ -608,35 +609,6 @@ hpa_t gva_to_hpa(struct kvm_vcpu *vcpu, gva_t gva)
        return gpa_to_hpa(vcpu, gpa);
 }
 
-
-static void release_pt_page_64(struct kvm_vcpu *vcpu, hpa_t page_hpa,
-                              int level)
-{
-       u64 *pos;
-       u64 *end;
-
-       ASSERT(vcpu);
-       ASSERT(VALID_PAGE(page_hpa));
-       ASSERT(level <= PT64_ROOT_LEVEL && level > 0);
-
-       for (pos = __va(page_hpa), end = pos + PT64_ENT_PER_PAGE;
-            pos != end; pos++) {
-               u64 current_ent = *pos;
-
-               if (is_present_pte(current_ent)) {
-                       if (level != 1)
-                               release_pt_page_64(vcpu,
-                                                 current_ent &
-                                                 PT64_BASE_ADDR_MASK,
-                                                 level - 1);
-                       else
-                               rmap_remove(vcpu->kvm, pos);
-               }
-               *pos = 0;
-       }
-       kvm_mmu_free_page(vcpu, page_hpa);
-}
-
 static void nonpaging_new_cr3(struct kvm_vcpu *vcpu)
 {
 }
@@ -743,18 +715,6 @@ static void mmu_alloc_roots(struct kvm_vcpu *vcpu)
        vcpu->mmu.root_hpa = __pa(vcpu->mmu.pae_root);
 }
 
-static void nonpaging_flush(struct kvm_vcpu *vcpu)
-{
-       hpa_t root = vcpu->mmu.root_hpa;
-
-       ++kvm_stat.tlb_flush;
-       pgprintk("nonpaging_flush\n");
-       mmu_free_roots(vcpu);
-       mmu_alloc_roots(vcpu);
-       kvm_arch_ops->set_cr3(vcpu, root);
-       kvm_arch_ops->tlb_flush(vcpu);
-}
-
 static gpa_t nonpaging_gva_to_gpa(struct kvm_vcpu *vcpu, gva_t vaddr)
 {
        return vaddr;
@@ -763,32 +723,19 @@ static gpa_t nonpaging_gva_to_gpa(struct kvm_vcpu *vcpu, gva_t vaddr)
 static int nonpaging_page_fault(struct kvm_vcpu *vcpu, gva_t gva,
                               u32 error_code)
 {
-       int ret;
        gpa_t addr = gva;
+       hpa_t paddr;
 
        ASSERT(vcpu);
        ASSERT(VALID_PAGE(vcpu->mmu.root_hpa));
 
-       for (;;) {
-            hpa_t paddr;
 
-            paddr = gpa_to_hpa(vcpu , addr & PT64_BASE_ADDR_MASK);
+       paddr = gpa_to_hpa(vcpu , addr & PT64_BASE_ADDR_MASK);
 
-            if (is_error_hpa(paddr))
-                    return 1;
-
-            ret = nonpaging_map(vcpu, addr & PAGE_MASK, paddr);
-            if (ret) {
-                    nonpaging_flush(vcpu);
-                    continue;
-            }
-            break;
-       }
-       return ret;
-}
+       if (is_error_hpa(paddr))
+               return 1;
 
-static void nonpaging_inval_page(struct kvm_vcpu *vcpu, gva_t addr)
-{
+       return nonpaging_map(vcpu, addr & PAGE_MASK, paddr);
 }
 
 static void nonpaging_free(struct kvm_vcpu *vcpu)
@@ -802,7 +749,6 @@ static int nonpaging_init_context(struct kvm_vcpu *vcpu)
 
        context->new_cr3 = nonpaging_new_cr3;
        context->page_fault = nonpaging_page_fault;
-       context->inval_page = nonpaging_inval_page;
        context->gva_to_gpa = nonpaging_gva_to_gpa;
        context->free = nonpaging_free;
        context->root_level = 0;
@@ -915,42 +861,6 @@ static int may_access(u64 pte, int write, int user)
        return 1;
 }
 
-/*
- * Remove a shadow pte.
- */
-static void paging_inval_page(struct kvm_vcpu *vcpu, gva_t addr)
-{
-       hpa_t page_addr = vcpu->mmu.root_hpa;
-       int level = vcpu->mmu.shadow_root_level;
-
-       ++kvm_stat.invlpg;
-
-       for (; ; level--) {
-               u32 index = PT64_INDEX(addr, level);
-               u64 *table = __va(page_addr);
-
-               if (level == PT_PAGE_TABLE_LEVEL ) {
-                       rmap_remove(vcpu->kvm, &table[index]);
-                       table[index] = 0;
-                       return;
-               }
-
-               if (!is_present_pte(table[index]))
-                       return;
-
-               page_addr = table[index] & PT64_BASE_ADDR_MASK;
-
-               if (level == PT_DIRECTORY_LEVEL &&
-                         (table[index] & PT_SHADOW_PS_MARK)) {
-                       table[index] = 0;
-                       release_pt_page_64(vcpu, page_addr, PT_PAGE_TABLE_LEVEL);
-
-                       kvm_arch_ops->tlb_flush(vcpu);
-                       return;
-               }
-       }
-}
-
 static void paging_free(struct kvm_vcpu *vcpu)
 {
        nonpaging_free(vcpu);
@@ -971,7 +881,6 @@ static int paging64_init_context_common(struct kvm_vcpu *vcpu, int level)
        ASSERT(is_pae(vcpu));
        context->new_cr3 = paging_new_cr3;
        context->page_fault = paging64_page_fault;
-       context->inval_page = paging_inval_page;
        context->gva_to_gpa = paging64_gva_to_gpa;
        context->free = paging_free;
        context->root_level = level;
@@ -994,7 +903,6 @@ static int paging32_init_context(struct kvm_vcpu *vcpu)
 
        context->new_cr3 = paging_new_cr3;
        context->page_fault = paging32_page_fault;
-       context->inval_page = paging_inval_page;
        context->gva_to_gpa = paging32_gva_to_gpa;
        context->free = paging_free;
        context->root_level = PT32_ROOT_LEVEL;
@@ -1093,6 +1001,18 @@ int kvm_mmu_unprotect_page_virt(struct kvm_vcpu *vcpu, gva_t gva)
        return kvm_mmu_unprotect_page(vcpu, gpa >> PAGE_SHIFT);
 }
 
+void kvm_mmu_free_some_pages(struct kvm_vcpu *vcpu)
+{
+       while (vcpu->kvm->n_free_mmu_pages < KVM_REFILL_PAGES) {
+               struct kvm_mmu_page *page;
+
+               page = container_of(vcpu->kvm->active_mmu_pages.prev,
+                                   struct kvm_mmu_page, link);
+               kvm_mmu_zap_page(vcpu, page);
+       }
+}
+EXPORT_SYMBOL_GPL(kvm_mmu_free_some_pages);
+
 static void free_mmu_pages(struct kvm_vcpu *vcpu)
 {
        while (!list_empty(&vcpu->free_pages)) {
@@ -1124,6 +1044,7 @@ static int alloc_mmu_pages(struct kvm_vcpu *vcpu)
                page_header->page_hpa = (hpa_t)page_to_pfn(page) << PAGE_SHIFT;
                memset(__va(page_header->page_hpa), 0, PAGE_SIZE);
                list_add(&page_header->link, &vcpu->free_pages);
+               ++vcpu->kvm->n_free_mmu_pages;
        }
 
        /*