x86/cpa: use an undefined PTE bit for testing CPA

Rather than using _PAGE_GLOBAL - which not all CPUs support - to test
CPA, use one of the reserved-for-software-use PTE flags instead.  This
allows CPA testing to work on CPUs which don't support PGD.

Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Cc: Stephen Tweedie <sct@redhat.com>
Cc: Eduardo Habkost <ehabkost@redhat.com>
Cc: Mark McLoughlin <markmc@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

diff --git a/arch/x86/mm/pageattr-test.c b/arch/x86/mm/pageattr-test.c
index 75f1b10..0dcd42e 100644 (file)
--- a/arch/x86/mm/pageattr-test.c
+++ b/arch/x86/mm/pageattr-test.c
@@ -1,8 +1,8 @@
 /*
  * self test for change_page_attr.
  *
- * Clears the global bit on random pages in the direct mapping, then reverts
- * and compares page tables forwards and afterwards.
+ * Clears the a test pte bit on random pages in the direct mapping,
+ * then reverts and compares page tables forwards and afterwards.
  */
 #include <linux/bootmem.h>
 #include <linux/kthread.h>
@@ -32,6 +32,13 @@ enum {
        GPS                     = (1<<30)
 };
 
+#define PAGE_TESTBIT   __pgprot(_PAGE_UNUSED1)
+
+static int pte_testbit(pte_t pte)
+{
+       return pte_flags(pte) & _PAGE_UNUSED1;
+}
+
 struct split_state {
        long lpg, gpg, spg, exec;
        long min_exec, max_exec;
@@ -165,15 +172,14 @@ static int pageattr_test(void)
                        continue;
                }
 
-               err = change_page_attr_clear(addr[i], len[i],
-                                              __pgprot(_PAGE_GLOBAL));
+               err = change_page_attr_set(addr[i], len[i], PAGE_TESTBIT);
                if (err < 0) {
                        printk(KERN_ERR "CPA %d failed %d\n", i, err);
                        failed++;
                }
 
                pte = lookup_address(addr[i], &level);
-               if (!pte || pte_global(*pte) || pte_huge(*pte)) {
+               if (!pte || !pte_testbit(*pte) || pte_huge(*pte)) {
                        printk(KERN_ERR "CPA %lx: bad pte %Lx\n", addr[i],
                                pte ? (u64)pte_val(*pte) : 0ULL);
                        failed++;
@@ -198,14 +204,13 @@ static int pageattr_test(void)
                        failed++;
                        continue;
                }
-               err = change_page_attr_set(addr[i], len[i],
-                                            __pgprot(_PAGE_GLOBAL));
+               err = change_page_attr_clear(addr[i], len[i], PAGE_TESTBIT);
                if (err < 0) {
                        printk(KERN_ERR "CPA reverting failed: %d\n", err);
                        failed++;
                }
                pte = lookup_address(addr[i], &level);
-               if (!pte || !pte_global(*pte)) {
+               if (!pte || pte_testbit(*pte)) {
                        printk(KERN_ERR "CPA %lx: bad pte after revert %Lx\n",
                                addr[i], pte ? (u64)pte_val(*pte) : 0ULL);
                        failed++;