KVM: MMU: mmu_convert_notrap helper

Need to convert shadow_notrap_nonpresent -> shadow_trap_nonpresent when
unsyncing pages.

Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Signed-off-by: Avi Kivity <avi@redhat.com>

1 files changed, 14 insertions, 0 deletions

diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c
index c9b4b902527b..57c7580e7f98 100644
--- a/arch/x86/kvm/mmu.c
+++ b/arch/x86/kvm/mmu.c
@@ -1173,6 +1173,20 @@ static void page_header_update_slot(struct kvm *kvm, void *pte, gfn_t gfn)
         __set_bit(slot, &sp->slot_bitmap);
 }
 
+static void mmu_convert_notrap(struct kvm_mmu_page *sp)
+{
+        int i;
+        u64 *pt = sp->spt;
+
+        if (shadow_trap_nonpresent_pte == shadow_notrap_nonpresent_pte)
+                return;
+
+        for (i = 0; i < PT64_ENT_PER_PAGE; ++i) {
+                if (pt[i] == shadow_notrap_nonpresent_pte)
+                        set_shadow_pte(&pt[i], shadow_trap_nonpresent_pte);
+        }
+}
+
 struct page *gva_to_page(struct kvm_vcpu *vcpu, gva_t gva)
 {
         struct page *page;