commit 5ae79d0f66b500742e079be68bc3a28353d9e6a3
author Jan Kiszka <jan.kiszka@siemens.com> Fri Nov 03 10:58:11 2017 +0100
committer Andrew Boie <andrewboie@gmail.com> Fri Nov 03 09:29:39 2017 -0700
tree a00ee06c4cc2a2b91795e369ffa339656faddceb
parent 44a3514a3345940c0a73169f7a3a280408ead12e

x86: MMU: Fix PAE page directory permissions

Do not set XD at page directory level - some leaf PTE may have it
cleared.

Fixes: d1703691c847 ("x86: MMU: Generation of PAE tables")

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>

scripts/gen_mmu.py

diff --git a/scripts/gen_mmu.py b/scripts/gen_mmu.py
index 6fb2701..3bc9316 100755
--- a/scripts/gen_mmu.py
+++ b/scripts/gen_mmu.py
@@ -543,7 +543,7 @@
         a = PAGE_ENTRY_ACCESSED
         ps = 0 << 7  # set to make sure that the phy page is 4KB
         page_table = self.address_of_page_table(pdpte, value.pde_index) << 12
-        xd = check_bits(perms, [62, 63]) << 63
+        xd = 0
         return (present |
                 read_write |
                 user_mode |