Messages in this thread Patch in this message | | | Subject | [PATCH 8/33] KVM: MMU: Make kvm_mmu_alloc_page() return a kvm_mmu_page pointer | From | Avi Kivity <> | Date | Thu, 04 Jan 2007 15:57:06 -0000 |
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This allows further manipulation on the shadow page table.
Signed-off-by: Avi Kivity <avi@qumranet.com>
Index: linux-2.6/drivers/kvm/mmu.c =================================================================== --- linux-2.6.orig/drivers/kvm/mmu.c +++ linux-2.6/drivers/kvm/mmu.c @@ -292,12 +292,13 @@ static int is_empty_shadow_page(hpa_t pa return 1; } -static hpa_t kvm_mmu_alloc_page(struct kvm_vcpu *vcpu, u64 *parent_pte) +static struct kvm_mmu_page *kvm_mmu_alloc_page(struct kvm_vcpu *vcpu, + u64 *parent_pte) { struct kvm_mmu_page *page; if (list_empty(&vcpu->free_pages)) - return INVALID_PAGE; + return NULL; page = list_entry(vcpu->free_pages.next, struct kvm_mmu_page, link); list_del(&page->link); @@ -306,7 +307,7 @@ static hpa_t kvm_mmu_alloc_page(struct k page->slot_bitmap = 0; page->global = 1; page->parent_pte = parent_pte; - return page->page_hpa; + return page; } static void page_header_update_slot(struct kvm *kvm, void *pte, gpa_t gpa) @@ -402,19 +403,16 @@ static int nonpaging_map(struct kvm_vcpu } if (table[index] == 0) { - hpa_t new_table = kvm_mmu_alloc_page(vcpu, - &table[index]); + struct kvm_mmu_page *new_table; - if (!VALID_PAGE(new_table)) { + new_table = kvm_mmu_alloc_page(vcpu, &table[index]); + if (!new_table) { pgprintk("nonpaging_map: ENOMEM\n"); return -ENOMEM; } - if (level == PT32E_ROOT_LEVEL) - table[index] = new_table | PT_PRESENT_MASK; - else - table[index] = new_table | PT_PRESENT_MASK | - PT_WRITABLE_MASK | PT_USER_MASK; + table[index] = new_table->page_hpa | PT_PRESENT_MASK + | PT_WRITABLE_MASK | PT_USER_MASK; } table_addr = table[index] & PT64_BASE_ADDR_MASK; } @@ -454,7 +452,7 @@ static void mmu_alloc_roots(struct kvm_v hpa_t root = vcpu->mmu.root_hpa; ASSERT(!VALID_PAGE(root)); - root = kvm_mmu_alloc_page(vcpu, NULL); + root = kvm_mmu_alloc_page(vcpu, NULL)->page_hpa; vcpu->mmu.root_hpa = root; return; } @@ -463,7 +461,7 @@ static void mmu_alloc_roots(struct kvm_v hpa_t root = vcpu->mmu.pae_root[i]; ASSERT(!VALID_PAGE(root)); - root = kvm_mmu_alloc_page(vcpu, NULL); + root = kvm_mmu_alloc_page(vcpu, NULL)->page_hpa; vcpu->mmu.pae_root[i] = root | PT_PRESENT_MASK; } vcpu->mmu.root_hpa = __pa(vcpu->mmu.pae_root); Index: linux-2.6/drivers/kvm/paging_tmpl.h =================================================================== --- linux-2.6.orig/drivers/kvm/paging_tmpl.h +++ linux-2.6/drivers/kvm/paging_tmpl.h @@ -179,6 +179,7 @@ static u64 *FNAME(fetch)(struct kvm_vcpu for (; ; level--) { u32 index = SHADOW_PT_INDEX(addr, level); u64 *shadow_ent = ((u64 *)__va(shadow_addr)) + index; + struct kvm_mmu_page *shadow_page; u64 shadow_pte; if (is_present_pte(*shadow_ent) || is_io_pte(*shadow_ent)) { @@ -204,9 +205,10 @@ static u64 *FNAME(fetch)(struct kvm_vcpu return shadow_ent; } - shadow_addr = kvm_mmu_alloc_page(vcpu, shadow_ent); - if (!VALID_PAGE(shadow_addr)) + shadow_page = kvm_mmu_alloc_page(vcpu, shadow_ent); + if (!shadow_page) return ERR_PTR(-ENOMEM); + shadow_addr = shadow_page->page_hpa; shadow_pte = shadow_addr | PT_PRESENT_MASK | PT_ACCESSED_MASK | PT_WRITABLE_MASK | PT_USER_MASK; *shadow_ent = shadow_pte; - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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