3 files changed, 13 insertions, 4 deletions

diff --git a/drivers/kvm/kvm.h b/drivers/kvm/kvm.h
index 7361c45d70c..f5e343cb06b 100644
--- a/drivers/kvm/kvm.h
+++ b/drivers/kvm/kvm.h
@@ -109,6 +109,7 @@ struct kvm_pte_chain {
  *   bits 4:7 - page table level for this shadow (1-4)
  *   bits 8:9 - page table quadrant for 2-level guests
  *   bit   16 - "metaphysical" - gfn is not a real page (huge page/real mode)
+ *   bits 17:18 - "access" - the user and writable bits of a huge page pde
  */
 union kvm_mmu_page_role {
         unsigned word;
@@ -118,6 +119,7 @@ union kvm_mmu_page_role {
                 unsigned quadrant : 2;
                 unsigned pad_for_nice_hex_output : 6;
                 unsigned metaphysical : 1;
+                unsigned hugepage_access : 2;
         };
 };
 
diff --git a/drivers/kvm/mmu.c b/drivers/kvm/mmu.c
index 2930d7cc7c0..c738fb1cea3 100644
--- a/drivers/kvm/mmu.c
+++ b/drivers/kvm/mmu.c
@@ -568,6 +568,7 @@ static struct kvm_mmu_page *kvm_mmu_get_page(struct kvm_vcpu *vcpu,
                                              gva_t gaddr,
                                              unsigned level,
                                              int metaphysical,
+                                             unsigned hugepage_access,
                                              u64 *parent_pte)
 {
         union kvm_mmu_page_role role;
@@ -581,6 +582,7 @@ static struct kvm_mmu_page *kvm_mmu_get_page(struct kvm_vcpu *vcpu,
         role.glevels = vcpu->mmu.root_level;
         role.level = level;
         role.metaphysical = metaphysical;
+        role.hugepage_access = hugepage_access;
         if (vcpu->mmu.root_level <= PT32_ROOT_LEVEL) {
                 quadrant = gaddr >> (PAGE_SHIFT + (PT64_PT_BITS * level));
                 quadrant &= (1 << ((PT32_PT_BITS - PT64_PT_BITS) * level)) - 1;
@@ -780,7 +782,7 @@ static int nonpaging_map(struct kvm_vcpu *vcpu, gva_t v, hpa_t p)
                                 >> PAGE_SHIFT;
                         new_table = kvm_mmu_get_page(vcpu, pseudo_gfn,
                                                      v, level - 1,
-                                                     1, &table[index]);
+                                                     1, 0, &table[index]);
                         if (!new_table) {
                                 pgprintk("nonpaging_map: ENOMEM\n");
                                 return -ENOMEM;
@@ -835,7 +837,7 @@ static void mmu_alloc_roots(struct kvm_vcpu *vcpu)
 
                 ASSERT(!VALID_PAGE(root));
                 page = kvm_mmu_get_page(vcpu, root_gfn, 0,
-                                        PT64_ROOT_LEVEL, 0, NULL);
+                                        PT64_ROOT_LEVEL, 0, 0, NULL);
                 root = page->page_hpa;
                 ++page->root_count;
                 vcpu->mmu.root_hpa = root;
@@ -852,7 +854,7 @@ static void mmu_alloc_roots(struct kvm_vcpu *vcpu)
                         root_gfn = 0;
                 page = kvm_mmu_get_page(vcpu, root_gfn, i << 30,
                                         PT32_ROOT_LEVEL, !is_paging(vcpu),
-                                        NULL);
+                                        0, NULL);
                 root = page->page_hpa;
                 ++page->root_count;
                 vcpu->mmu.pae_root[i] = root | PT_PRESENT_MASK;
diff --git a/drivers/kvm/paging_tmpl.h b/drivers/kvm/paging_tmpl.h
index 17bd4400c92..b94010dad80 100644
--- a/drivers/kvm/paging_tmpl.h
+++ b/drivers/kvm/paging_tmpl.h
@@ -247,6 +247,7 @@ static u64 *FNAME(fetch)(struct kvm_vcpu *vcpu, gva_t addr,
                 u64 shadow_pte;
                 int metaphysical;
                 gfn_t table_gfn;
+                unsigned hugepage_access = 0;
 
                 if (is_present_pte(*shadow_ent) || is_io_pte(*shadow_ent)) {
                         if (level == PT_PAGE_TABLE_LEVEL)
@@ -276,6 +277,9 @@ static u64 *FNAME(fetch)(struct kvm_vcpu *vcpu, gva_t addr,
                 if (level - 1 == PT_PAGE_TABLE_LEVEL
                     && walker->level == PT_DIRECTORY_LEVEL) {
                         metaphysical = 1;
+                        hugepage_access = *guest_ent;
+                        hugepage_access &= PT_USER_MASK | PT_WRITABLE_MASK;
+                        hugepage_access >>= PT_WRITABLE_SHIFT;
                         table_gfn = (*guest_ent & PT_BASE_ADDR_MASK)
                                 >> PAGE_SHIFT;
                 } else {
@@ -283,7 +287,8 @@ static u64 *FNAME(fetch)(struct kvm_vcpu *vcpu, gva_t addr,
                         table_gfn = walker->table_gfn[level - 2];
                 }
                 shadow_page = kvm_mmu_get_page(vcpu, table_gfn, addr, level-1,
-                                               metaphysical, shadow_ent);
+                                               metaphysical, hugepage_access,
+                                               shadow_ent);
                 shadow_addr = shadow_page->page_hpa;
                 shadow_pte = shadow_addr | PT_PRESENT_MASK | PT_ACCESSED_MASK
                         | PT_WRITABLE_MASK | PT_USER_MASK;