x86: cpa: fix the self-test
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
diff --git a/arch/x86/mm/pageattr.c b/arch/x86/mm/pageattr.c
index 97ec9e7..532a40b 100644
--- a/arch/x86/mm/pageattr.c
+++ b/arch/x86/mm/pageattr.c
@@ -197,10 +197,11 @@
unsigned long addr;
pte_t *pbase, *tmp;
struct page *base;
- int i, level;
+ unsigned int i, level;
#ifdef CONFIG_DEBUG_PAGEALLOC
- gfp_flags = GFP_ATOMIC;
+ gfp_flags = __GFP_HIGH | __GFP_NOFAIL | __GFP_NOWARN;
+ gfp_flags = GFP_ATOMIC | __GFP_NOWARN;
#endif
base = alloc_pages(gfp_flags, 0);
if (!base)
@@ -224,6 +225,7 @@
paravirt_alloc_pt(&init_mm, page_to_pfn(base));
#endif
+ pgprot_val(ref_prot) &= ~_PAGE_NX;
for (i = 0; i < PTRS_PER_PTE; i++, addr += PAGE_SIZE)
set_pte(&pbase[i], pfn_pte(addr >> PAGE_SHIFT, ref_prot));
@@ -248,7 +250,8 @@
}
static int
-__change_page_attr(unsigned long address, unsigned long pfn, pgprot_t prot)
+__change_page_attr(unsigned long address, unsigned long pfn,
+ pgprot_t mask_set, pgprot_t mask_clr)
{
struct page *kpte_page;
int level, err = 0;
@@ -267,15 +270,20 @@
BUG_ON(PageLRU(kpte_page));
BUG_ON(PageCompound(kpte_page));
- prot = static_protections(prot, address);
-
if (level == PG_LEVEL_4K) {
- WARN_ON_ONCE(pgprot_val(prot) & _PAGE_PSE);
- set_pte_atomic(kpte, pfn_pte(pfn, canon_pgprot(prot)));
- } else {
- /* Clear the PSE bit for the 4k level pages ! */
- pgprot_val(prot) = pgprot_val(prot) & ~_PAGE_PSE;
+ pgprot_t new_prot = pte_pgprot(*kpte);
+ pte_t new_pte, old_pte = *kpte;
+ pgprot_val(new_prot) &= ~pgprot_val(mask_clr);
+ pgprot_val(new_prot) |= pgprot_val(mask_set);
+
+ new_prot = static_protections(new_prot, address);
+
+ new_pte = pfn_pte(pfn, canon_pgprot(new_prot));
+ BUG_ON(pte_pfn(new_pte) != pte_pfn(old_pte));
+
+ set_pte_atomic(kpte, new_pte);
+ } else {
err = split_large_page(kpte, address);
if (!err)
goto repeat;
@@ -297,22 +305,26 @@
* Modules and drivers should use the set_memory_* APIs instead.
*/
-static int change_page_attr_addr(unsigned long address, pgprot_t prot)
+static int
+change_page_attr_addr(unsigned long address, pgprot_t mask_set,
+ pgprot_t mask_clr)
{
int err = 0, kernel_map = 0;
- unsigned long pfn = __pa(address) >> PAGE_SHIFT;
+ unsigned long pfn;
#ifdef CONFIG_X86_64
if (address >= __START_KERNEL_map &&
address < __START_KERNEL_map + KERNEL_TEXT_SIZE) {
- address = (unsigned long)__va(__pa(address));
+ address = (unsigned long)__va(__pa((void *)address));
kernel_map = 1;
}
#endif
- if (!kernel_map || pte_present(pfn_pte(0, prot))) {
- err = __change_page_attr(address, pfn, prot);
+ pfn = __pa(address) >> PAGE_SHIFT;
+
+ if (!kernel_map || 1) {
+ err = __change_page_attr(address, pfn, mask_set, mask_clr);
if (err)
return err;
}
@@ -324,12 +336,15 @@
*/
if (__pa(address) < KERNEL_TEXT_SIZE) {
unsigned long addr2;
- pgprot_t prot2;
- addr2 = __START_KERNEL_map + __pa(address);
+ addr2 = __pa(address) + __START_KERNEL_map - phys_base;
/* Make sure the kernel mappings stay executable */
- prot2 = pte_pgprot(pte_mkexec(pfn_pte(0, prot)));
- err = __change_page_attr(addr2, pfn, prot2);
+ pgprot_val(mask_clr) |= _PAGE_NX;
+ /*
+ * Our high aliases are imprecise, so do not propagate
+ * failures back to users:
+ */
+ __change_page_attr(addr2, pfn, mask_set, mask_clr);
}
#endif
@@ -339,26 +354,13 @@
static int __change_page_attr_set_clr(unsigned long addr, int numpages,
pgprot_t mask_set, pgprot_t mask_clr)
{
- pgprot_t new_prot;
- int level;
- pte_t *pte;
- int i, ret;
+ unsigned int i;
+ int ret;
- for (i = 0; i < numpages ; i++) {
-
- pte = lookup_address(addr, &level);
- if (!pte)
- return -EINVAL;
-
- new_prot = pte_pgprot(*pte);
-
- pgprot_val(new_prot) &= ~pgprot_val(mask_clr);
- pgprot_val(new_prot) |= pgprot_val(mask_set);
-
- ret = change_page_attr_addr(addr, new_prot);
+ for (i = 0; i < numpages ; i++, addr += PAGE_SIZE) {
+ ret = change_page_attr_addr(addr, mask_set, mask_clr);
if (ret)
return ret;
- addr += PAGE_SIZE;
}
return 0;
