[PATCHv3 07/17] x86/mm: Preserve KeyID on pte_modify() and pgprot_modify()

Kirill A. Shutemov
2018-06-12T14:41:33Z

Encrypted VMA will have KeyID stored in vma->vm_page_prot. This way we
don't need to do anything special to setup encrypted page table entries
and don't need to reserve space for KeyID in a VMA.

This patch changes _PAGE_CHG_MASK to include KeyID bits. Otherwise they
are going to be stripped from vm_page_prot on the first pgprot_modify().

Define PTE_PFN_MASK_MAX similar to PTE_PFN_MASK but based on
__PHYSICAL_MASK_SHIFT. This way we include whole range of bits
architecturally available for PFN without referencing physical_mask and
mktme_keyid_mask variables.

Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
---
arch/x86/include/asm/pgtable_types.h | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/arch/x86/include/asm/pgtable_types.h b/arch/x86/include/asm/pgtable_types.h
index 1e5a40673953..e8ebe760b88d 100644
--- a/arch/x86/include/asm/pgtable_types.h
+++ b/arch/x86/include/asm/pgtable_types.h
@@ -121,8 +121,13 @@
* protection key is treated like _PAGE_RW, for
* instance, and is *not* included in this mask since
* pte_modify() does modify it.
+ *
+ * It includes full range of PFN bits regardless if they were claimed for KeyID
+ * or not: we want to preserve KeyID on pte_modify() and pgprot_modify().
*/
-#define _PAGE_CHG_MASK (PTE_PFN_MASK | _PAGE_PCD | _PAGE_PWT | \
+#define PTE_PFN_MASK_MAX \
+ (((signed long)PAGE_MASK) & ((1ULL << __PHYSICAL_MASK_SHIFT) - 1))
+#define _PAGE_CHG_MASK (PTE_PFN_MASK_MAX | _PAGE_PCD | _PAGE_PWT | \
_PAGE_SPECIAL | _PAGE_ACCESSED | _PAGE_DIRTY | \
_PAGE_SOFT_DIRTY)
#define _HPAGE_CHG_MASK (_PAGE_CHG_MASK | _PAGE_PSE)
--
2.17.1