nEPT: correctly check if remote tlb flush is needed for shadowed EPT tables

need_remote_flush() assumes that shadow page is in PT64 format, but
with addition of nested EPT this is no longer always true. Fix it by
bits definitions that depend on host shadow page type.

Reported-by: Xiao Guangrong <xiaoguangrong@linux.vnet.ibm.com>
Reviewed-by: Xiao Guangrong <xiaoguangrong@linux.vnet.ibm.com>
Signed-off-by: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

1 files changed, 4 insertions, 4 deletions

diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c
index 68d0f086de6c..75d843bb4ca3 100644
--- a/arch/x86/kvm/mmu.c
+++ b/arch/x86/kvm/mmu.c
@@ -132,8 +132,8 @@ module_param(dbg, bool, 0644);
         (PAGE_MASK & ~((1ULL << (PAGE_SHIFT + (((level) - 1) \
                                             * PT32_LEVEL_BITS))) - 1))
 
-#define PT64_PERM_MASK (PT_PRESENT_MASK | PT_WRITABLE_MASK | PT_USER_MASK \
-                        | PT64_NX_MASK)
+#define PT64_PERM_MASK (PT_PRESENT_MASK | PT_WRITABLE_MASK | shadow_user_mask \
+                        | shadow_x_mask | shadow_nx_mask)
 
 #define ACC_EXEC_MASK    1
 #define ACC_WRITE_MASK   PT_WRITABLE_MASK
@@ -3879,8 +3879,8 @@ static bool need_remote_flush(u64 old, u64 new)
                 return true;
         if ((old ^ new) & PT64_BASE_ADDR_MASK)
                 return true;
-        old ^= PT64_NX_MASK;
-        new ^= PT64_NX_MASK;
+        old ^= shadow_nx_mask;
+        new ^= shadow_nx_mask;
         return (old & ~new & PT64_PERM_MASK) != 0;
 }