diff options
| author | Xiao Guangrong <xiaoguangrong@cn.fujitsu.com> | 2011-07-12 03:21:17 +0800 |
|---|---|---|
| committer | Avi Kivity <avi@redhat.com> | 2011-07-24 11:50:23 +0300 |
| commit | 052331bea38dfc176322ec85642eb98d6803a762 (patch) | |
| tree | ade0a6bf8c594b7bd516f76aa996711889b66384 | |
| parent | d910f5c1064d7ff09c31b0191564f9f99e210f91 (diff) | |
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>
| -rw-r--r-- | arch/x86/kvm/mmu.c | 9 |
1 files changed, 5 insertions, 4 deletions
diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c index da0f3b08107..03323dc705c 100644 --- a/arch/x86/kvm/mmu.c +++ b/arch/x86/kvm/mmu.c @@ -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; } |