- spte = __pa(shadow_page->spt) | PT_PRESENT_MASK | PT_ACCESSED_MASK
- | PT_WRITABLE_MASK | PT_USER_MASK;
- *sptep = spte;
- return 0;
-}
-
-static u64 *FNAME(fetch)(struct kvm_vcpu *vcpu, gva_t addr,
- struct guest_walker *guest_walker,
- int user_fault, int write_fault, int largepage,
- int *ptwrite, pfn_t pfn)
-{
- struct shadow_walker walker = {
- .walker = { .entry = FNAME(shadow_walk_entry), },
- .guest_walker = guest_walker,
- .user_fault = user_fault,
- .write_fault = write_fault,
- .largepage = largepage,
- .ptwrite = ptwrite,
- .pfn = pfn,
- };
-
- if (!is_present_pte(guest_walker->ptes[guest_walker->level - 1]))
- return NULL;
+ if (level == PT_DIRECTORY_LEVEL
+ && gw->level == PT_DIRECTORY_LEVEL) {
+ direct = 1;
+ if (!is_dirty_pte(gw->ptes[level - 1]))
+ access &= ~ACC_WRITE_MASK;
+ table_gfn = gpte_to_gfn(gw->ptes[level - 1]);
+ } else {
+ direct = 0;
+ table_gfn = gw->table_gfn[level - 2];
+ }
+ shadow_page = kvm_mmu_get_page(vcpu, table_gfn, addr, level-1,
+ direct, access, sptep);
+ if (!direct) {
+ r = kvm_read_guest_atomic(vcpu->kvm,
+ gw->pte_gpa[level - 2],
+ &curr_pte, sizeof(curr_pte));
+ if (r || curr_pte != gw->ptes[level - 2]) {
+ kvm_mmu_put_page(shadow_page, sptep);
+ kvm_release_pfn_clean(pfn);
+ sptep = NULL;
+ break;
+ }
+ }