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@xxxxxxxxxxxxxxx> --- 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
