KVM: MMU: Fix race when instantiating a shadow pte

[linux-block.git] / arch / x86 / kvm / mmu.c

diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c
index 194ece6974e6619953ef183a1dc207928dc6bca8..d8172aabc660de7503c43b697fea470d81f7eb9a 100644 (file)
--- a/arch/x86/kvm/mmu.c
+++ b/arch/x86/kvm/mmu.c
@@ -681,8 +681,7 @@ static struct kvm_mmu_page *kvm_mmu_get_page(struct kvm_vcpu *vcpu,
                                             unsigned level,
                                             int metaphysical,
                                             unsigned access,
-                                            u64 *parent_pte,
-                                            bool *new_page)
+                                            u64 *parent_pte)
 {
        union kvm_mmu_page_role role;
        unsigned index;
@@ -722,8 +721,6 @@ static struct kvm_mmu_page *kvm_mmu_get_page(struct kvm_vcpu *vcpu,
        vcpu->arch.mmu.prefetch_page(vcpu, sp);
        if (!metaphysical)
                rmap_write_protect(vcpu->kvm, gfn);
-       if (new_page)
-               *new_page = 1;
        return sp;
 }
 
@@ -1006,8 +1003,7 @@ static int __nonpaging_map(struct kvm_vcpu *vcpu, gva_t v, int write,
                                >> PAGE_SHIFT;
                        new_table = kvm_mmu_get_page(vcpu, pseudo_gfn,
                                                     v, level - 1,
-                                                    1, ACC_ALL, &table[index],
-                                                    NULL);
+                                                    1, ACC_ALL, &table[index]);
                        if (!new_table) {
                                pgprintk("nonpaging_map: ENOMEM\n");
                                kvm_release_page_clean(page);
@@ -1100,7 +1096,7 @@ static void mmu_alloc_roots(struct kvm_vcpu *vcpu)
 
                ASSERT(!VALID_PAGE(root));
                sp = kvm_mmu_get_page(vcpu, root_gfn, 0,
-                                     PT64_ROOT_LEVEL, 0, ACC_ALL, NULL, NULL);
+                                     PT64_ROOT_LEVEL, 0, ACC_ALL, NULL);
                root = __pa(sp->spt);
                ++sp->root_count;
                vcpu->arch.mmu.root_hpa = root;
@@ -1121,7 +1117,7 @@ static void mmu_alloc_roots(struct kvm_vcpu *vcpu)
                        root_gfn = 0;
                sp = kvm_mmu_get_page(vcpu, root_gfn, i << 30,
                                      PT32_ROOT_LEVEL, !is_paging(vcpu),
-                                     ACC_ALL, NULL, NULL);
+                                     ACC_ALL, NULL);
                root = __pa(sp->spt);
                ++sp->root_count;
                vcpu->arch.mmu.pae_root[i] = root | PT_PRESENT_MASK;