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Subject[PATCH, RFC 12/62] x86/mm: Add a helper to retrieve KeyID for a VMA
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 | 12 ++++++++++++
arch/x86/mm/mktme.c | 7 +++++++
2 files changed, 19 insertions(+)

diff --git a/arch/x86/include/asm/mktme.h b/arch/x86/include/asm/mktme.h
index 51f831b94179..b5afa31b4526 100644
--- a/arch/x86/include/asm/mktme.h
+++ b/arch/x86/include/asm/mktme.h
@@ -5,6 +5,8 @@
#include <linux/page_ext.h>
#include <linux/jump_label.h>

+struct vm_area_struct;
+
#ifdef CONFIG_X86_INTEL_MKTME
extern phys_addr_t mktme_keyid_mask;
extern int mktme_nr_keyids;
@@ -28,6 +30,16 @@ static inline int page_keyid(const struct page *page)
}


+#define vma_keyid vma_keyid
+int __vma_keyid(struct vm_area_struct *vma);
+static inline int vma_keyid(struct vm_area_struct *vma)
+{
+ if (!mktme_enabled())
+ return 0;
+
+ return __vma_keyid(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 9dc256e3654b..d4a1a9e9b1c0 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>

/* Mask to extract KeyID from physical address. */
@@ -30,3 +31,9 @@ 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 = pgprot_val(vma->vm_page_prot);
+ return (prot & mktme_keyid_mask) >> mktme_keyid_shift;
+}
--
2.20.1
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