Marcelo Tosatti wrote:
Examine guest pagetable and bring the shadow back in sync. Caller is responsible
for local TLB flush before re-entering guest mode.
Neat! We had a gpte snapshot, and I forgot all about it.
+ for (i = 0; i < PT64_ENT_PER_PAGE; i++) {
+ if (is_shadow_present_pte(sp->spt[i])) {
if (!is_..())
continue;
to reduce indentation.
+ pte_gpa += (i+offset) * sizeof(pt_element_t);
+
+ if (kvm_read_guest_atomic(vcpu->kvm, pte_gpa, &gpte,
+ sizeof(pt_element_t)))
+ return -EINVAL;
I guess we want a kvm_map_guest_page_atomic() to speed this up. Can be
done later as an optimization, of course.
+
+ if (gpte_to_gfn(gpte) != gfn || !(gpte &
PT_ACCESSED_MASK)) {
+ rmap_remove(vcpu->kvm, &sp->spt[i]);
+ if (is_present_pte(gpte))
+ sp->spt[i] = shadow_trap_nonpresent_pte;
+ else
+ sp->spt[i] =
shadow_notrap_nonpresent_pte;
set_shadow_pte()
+ continue;
+ }
+
+ if (!is_present_pte(gpte)) {
+ rmap_remove(vcpu->kvm, &sp->spt[i]);
+ sp->spt[i] = shadow_notrap_nonpresent_pte;
+ continue;
+ }
Merge with previous block?
--
I have a truly marvellous patch that fixes the bug which this
signature is too narrow to contain.
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