KVM: MMU: fix walking shadow page table
Properly check the last mapping, and do not walk to the next level if last spte is met Signed-off-by: Xiao Guangrong <xiaoguangrong@cn.fujitsu.com> Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
parent
d910f5c106
commit
052331bea3
|
@ -1517,10 +1517,6 @@ static bool shadow_walk_okay(struct kvm_shadow_walk_iterator *iterator)
|
|||
if (iterator->level < PT_PAGE_TABLE_LEVEL)
|
||||
return false;
|
||||
|
||||
if (iterator->level == PT_PAGE_TABLE_LEVEL)
|
||||
if (is_large_pte(*iterator->sptep))
|
||||
return false;
|
||||
|
||||
iterator->index = SHADOW_PT_INDEX(iterator->addr, iterator->level);
|
||||
iterator->sptep = ((u64 *)__va(iterator->shadow_addr)) + iterator->index;
|
||||
return true;
|
||||
|
@ -1528,6 +1524,11 @@ static bool shadow_walk_okay(struct kvm_shadow_walk_iterator *iterator)
|
|||
|
||||
static void shadow_walk_next(struct kvm_shadow_walk_iterator *iterator)
|
||||
{
|
||||
if (is_last_spte(*iterator->sptep, iterator->level)) {
|
||||
iterator->level = 0;
|
||||
return;
|
||||
}
|
||||
|
||||
iterator->shadow_addr = *iterator->sptep & PT64_BASE_ADDR_MASK;
|
||||
--iterator->level;
|
||||
}
|
||||
|
|
Loading…
Reference in New Issue