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Subject[PATCHv5 11/19] x86/mm: Implement vma_keyid()
Date
We store KeyID in upper bits for vm_page_prot that match position of
KeyID in PTE. vma_keyid() extracts KeyID from vm_page_prot.

With KeyID in vm_page_prot we don't need to modify any page table helper
to propagate the KeyID to page table entires.

Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
---
arch/x86/include/asm/mktme.h | 5 +++++
arch/x86/mm/mktme.c | 12 ++++++++++++
2 files changed, 17 insertions(+)

diff --git a/arch/x86/include/asm/mktme.h b/arch/x86/include/asm/mktme.h
index 7266494b4f0a..f0b7844e36a4 100644
--- a/arch/x86/include/asm/mktme.h
+++ b/arch/x86/include/asm/mktme.h
@@ -4,6 +4,8 @@
#include <linux/types.h>
#include <linux/page_ext.h>

+struct vm_area_struct;
+
#ifdef CONFIG_X86_INTEL_MKTME
extern phys_addr_t mktme_keyid_mask;
extern int mktme_nr_keyids;
@@ -14,6 +16,9 @@ extern struct page_ext_operations page_mktme_ops;
#define page_keyid page_keyid
int page_keyid(const struct page *page);

+#define vma_keyid vma_keyid
+int vma_keyid(struct vm_area_struct *vma);
+
#else
#define mktme_keyid_mask ((phys_addr_t)0)
#define mktme_nr_keyids 0
diff --git a/arch/x86/mm/mktme.c b/arch/x86/mm/mktme.c
index 09cbff678b9f..a1f40ee61b25 100644
--- a/arch/x86/mm/mktme.c
+++ b/arch/x86/mm/mktme.c
@@ -1,3 +1,4 @@
+#include <linux/mm.h>
#include <asm/mktme.h>

phys_addr_t mktme_keyid_mask;
@@ -37,3 +38,14 @@ struct page_ext_operations page_mktme_ops = {
.need = need_page_mktme,
.init = init_page_mktme,
};
+
+int vma_keyid(struct vm_area_struct *vma)
+{
+ pgprotval_t prot;
+
+ if (!mktme_enabled())
+ return 0;
+
+ prot = pgprot_val(vma->vm_page_prot);
+ return (prot & mktme_keyid_mask) >> mktme_keyid_shift;
+}
--
2.18.0
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