PT_PRESENT_MASK bit is not enough to see the spte has already been mapped
into pte-list for mmio spte also set this bit. Use is_shadow_present_pte
instead to fix it
Also, this patch move many assertions to the common place to clean up the
code
Signed-off-by: Xiao Guangrong <xiaoguangrong@xxxxxxxxxxxxxxxxxx>
---
arch/x86/kvm/mmu.c | 20 ++++++--------------
1 files changed, 6 insertions(+), 14 deletions(-)
diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c
index 2291ea3..58f813a 100644
--- a/arch/x86/kvm/mmu.c
+++ b/arch/x86/kvm/mmu.c
@@ -1009,7 +1009,9 @@ static u64 *pte_list_get_next(struct pte_list_iterator *iter)
#define for_each_spte_in_pte_list(pte_list, iter, spte) \
for (spte = pte_list_get_first(pte_list, &(iter)); \
- spte != NULL; spte = pte_list_get_next(&(iter)))
+ spte != NULL && \
+ ({WARN_ON(!is_shadow_present_pte(*(spte))); 1; });\
+ spte = pte_list_get_next(&iter))
#define for_each_spte_in_rmap(rmap, iter, spte) \
for_each_spte_in_pte_list(rmap, iter, spte)
@@ -1128,11 +1130,8 @@ static bool __rmap_write_protect(struct kvm *kvm, unsigned long *rmapp,
struct pte_list_iterator iter;
bool flush = false;
- for_each_spte_in_rmap(*rmapp, iter, sptep) {
- BUG_ON(!(*sptep & PT_PRESENT_MASK));
-
+ for_each_spte_in_rmap(*rmapp, iter, sptep)
flush |= spte_write_protect(kvm, sptep, pt_protect);
- }
return flush;
}
@@ -1215,7 +1214,6 @@ static int kvm_set_pte_rmapp(struct kvm *kvm, unsigned long *rmapp,
need_flush = kvm_unmap_rmapp(kvm, rmapp, slot, data);
else
for_each_spte_in_rmap(*rmapp, iter, sptep) {
- BUG_ON(!is_shadow_present_pte(*sptep));
rmap_printk("kvm_set_pte_rmapp: spte %p %llx\n",
sptep, *sptep);
@@ -1336,15 +1334,12 @@ static int kvm_age_rmapp(struct kvm *kvm, unsigned long *rmapp,
goto out;
}
- for_each_spte_in_rmap(*rmapp, iter, sptep) {
- BUG_ON(!is_shadow_present_pte(*sptep));
-
+ for_each_spte_in_rmap(*rmapp, iter, sptep)
if (*sptep & shadow_accessed_mask) {
young = 1;
clear_bit((ffs(shadow_accessed_mask) - 1),
(unsigned long *)sptep);
}
- }
out:
/* @data has hva passed to kvm_age_hva(). */
trace_kvm_age_page(data, slot, young);
@@ -1366,14 +1361,11 @@ static int kvm_test_age_rmapp(struct kvm *kvm, unsigned long *rmapp,
if (!shadow_accessed_mask)
goto out;
- for_each_spte_in_rmap(*rmapp, iter, sptep) {
- BUG_ON(!is_shadow_present_pte(*sptep));
-
+ for_each_spte_in_rmap(*rmapp, iter, sptep)
if (*sptep & shadow_accessed_mask) {
young = 1;
break;
}
- }
out:
return young;
}
--
1.7.7.6
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