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Subject[RFC, PATCH 11/22] mm: Use __GFP_ENCRYPT for pages in encrypted VMAs
Date
Change page allocation path to pass __GFP_ENCRYPT on allocation pages
for encrypted VMAs.

There are two different path where __GFP_ENCRYPT has to be set. One for
kernel compiled with CONFIG_NUMA enabled and the second for kernel
without NUMA support.

Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
---
include/linux/gfp.h | 17 +++++++++++------
include/linux/mm.h | 7 +++++++
mm/mempolicy.c | 3 +++
3 files changed, 21 insertions(+), 6 deletions(-)

diff --git a/include/linux/gfp.h b/include/linux/gfp.h
index 43a93ca11c3c..c2e6f99a7fc6 100644
--- a/include/linux/gfp.h
+++ b/include/linux/gfp.h
@@ -506,21 +506,26 @@ alloc_pages(gfp_t gfp_mask, unsigned int order)
extern struct page *alloc_pages_vma(gfp_t gfp_mask, int order,
struct vm_area_struct *vma, unsigned long addr,
int node, bool hugepage);
-#define alloc_hugepage_vma(gfp_mask, vma, addr, order) \
- alloc_pages_vma(gfp_mask, order, vma, addr, numa_node_id(), true)
#else
#define alloc_pages(gfp_mask, order) \
alloc_pages_node(numa_node_id(), gfp_mask, order)
-#define alloc_pages_vma(gfp_mask, order, vma, addr, node, false)\
- alloc_pages(gfp_mask, order)
-#define alloc_hugepage_vma(gfp_mask, vma, addr, order) \
- alloc_pages(gfp_mask, order)
+
+static inline struct page *alloc_pages_vma(gfp_t gfp_mask, int order,
+ struct vm_area_struct *vma, unsigned long addr,
+ int node, bool hugepage)
+{
+ if (vma_is_encrypted(vma))
+ gfp_mask |= __GFP_ENCRYPT;
+ return alloc_pages(gfp_mask, order);
+}
#endif
#define alloc_page(gfp_mask) alloc_pages(gfp_mask, 0)
#define alloc_page_vma(gfp_mask, vma, addr) \
alloc_pages_vma(gfp_mask, 0, vma, addr, numa_node_id(), false)
#define alloc_page_vma_node(gfp_mask, vma, addr, node) \
alloc_pages_vma(gfp_mask, 0, vma, addr, node, false)
+#define alloc_hugepage_vma(gfp_mask, vma, addr, order) \
+ alloc_pages_vma(gfp_mask, order, vma, addr, numa_node_id(), true)

extern unsigned long __get_free_pages(gfp_t gfp_mask, unsigned int order);
extern unsigned long get_zeroed_page(gfp_t gfp_mask);
diff --git a/include/linux/mm.h b/include/linux/mm.h
index 6791eccdb740..bc7b32d0189b 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -1479,6 +1479,13 @@ static inline bool vma_is_anonymous(struct vm_area_struct *vma)
return !vma->vm_ops;
}

+#ifndef vma_is_encrypted
+static inline bool vma_is_encrypted(struct vm_area_struct *vma)
+{
+ return false;
+}
+#endif
+
#ifdef CONFIG_SHMEM
/*
* The vma_is_shmem is not inline because it is used only by slow
diff --git a/mm/mempolicy.c b/mm/mempolicy.c
index d879f1d8a44a..da989273de40 100644
--- a/mm/mempolicy.c
+++ b/mm/mempolicy.c
@@ -1977,6 +1977,9 @@ alloc_pages_vma(gfp_t gfp, int order, struct vm_area_struct *vma,
int preferred_nid;
nodemask_t *nmask;

+ if (vma_is_encrypted(vma))
+ gfp |= __GFP_ENCRYPT;
+
pol = get_vma_policy(vma, addr);

if (pol->mode == MPOL_INTERLEAVE) {
--
2.16.1
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