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Subject[PATCHv2 07/14] mm/page_alloc: Add hook in page allocation path for encrypted pages
Date
Intel MKTME requires cache flushing when changing encryption KeyID for
a page.

Add prep_encrypted_page() hook for this. We need to pass down KeyID to
it through page allocation path.

Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
---
include/linux/gfp.h | 6 +++++
mm/compaction.c | 2 +-
mm/internal.h | 2 +-
mm/page_alloc.c | 65 ++++++++++++++++++++++++++++-------------------------
mm/page_isolation.c | 2 +-
5 files changed, 44 insertions(+), 33 deletions(-)

diff --git a/include/linux/gfp.h b/include/linux/gfp.h
index d9d45f47447d..aff798de9c97 100644
--- a/include/linux/gfp.h
+++ b/include/linux/gfp.h
@@ -446,6 +446,12 @@ static inline void arch_free_page(struct page *page, int order) { }
static inline void arch_alloc_page(struct page *page, int order) { }
#endif

+#ifndef prep_encrypted_page
+static inline void prep_encrypted_page(struct page *page, int order, int keyid)
+{
+}
+#endif
+
struct page *
__alloc_pages_nodemask(gfp_t gfp_mask, unsigned int order, int keyid,
int preferred_nid, nodemask_t *nodemask);
diff --git a/mm/compaction.c b/mm/compaction.c
index 2c8999d027ab..cb69620fdf34 100644
--- a/mm/compaction.c
+++ b/mm/compaction.c
@@ -77,7 +77,7 @@ static void map_pages(struct list_head *list)
order = page_private(page);
nr_pages = 1 << order;

- post_alloc_hook(page, order, __GFP_MOVABLE);
+ post_alloc_hook(page, order, page_keyid(page), __GFP_MOVABLE);
if (order)
split_page(page, order);

diff --git a/mm/internal.h b/mm/internal.h
index e6bd35182dae..d896c8e67669 100644
--- a/mm/internal.h
+++ b/mm/internal.h
@@ -164,7 +164,7 @@ extern int __isolate_free_page(struct page *page, unsigned int order);
extern void __free_pages_bootmem(struct page *page, unsigned long pfn,
unsigned int order);
extern void prep_compound_page(struct page *page, unsigned int order);
-extern void post_alloc_hook(struct page *page, unsigned int order,
+extern void post_alloc_hook(struct page *page, unsigned int order, int keyid,
gfp_t gfp_flags);
extern int user_min_free_kbytes;

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 229cdab065ca..a5097d9c2a51 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -1792,7 +1792,7 @@ static bool check_new_pages(struct page *page, unsigned int order)
return false;
}

-inline void post_alloc_hook(struct page *page, unsigned int order,
+inline void post_alloc_hook(struct page *page, unsigned int order, int keyid,
gfp_t gfp_flags)
{
set_page_private(page, 0);
@@ -1803,14 +1803,15 @@ inline void post_alloc_hook(struct page *page, unsigned int order,
kernel_poison_pages(page, 1 << order, 1);
kasan_alloc_pages(page, order);
set_page_owner(page, order, gfp_flags);
+ prep_encrypted_page(page, order, keyid);
}

-static void prep_new_page(struct page *page, unsigned int order, gfp_t gfp_flags,
- unsigned int alloc_flags)
+static void prep_new_page(struct page *page, unsigned int order, int keyid,
+ gfp_t gfp_flags, unsigned int alloc_flags)
{
int i;

- post_alloc_hook(page, order, gfp_flags);
+ post_alloc_hook(page, order, keyid, gfp_flags);

if (!free_pages_prezeroed() && (gfp_flags & __GFP_ZERO))
for (i = 0; i < (1 << order); i++)
@@ -3151,8 +3152,8 @@ static bool zone_allows_reclaim(struct zone *local_zone, struct zone *zone)
* a page.
*/
static struct page *
-get_page_from_freelist(gfp_t gfp_mask, unsigned int order, int alloc_flags,
- const struct alloc_context *ac)
+get_page_from_freelist(gfp_t gfp_mask, unsigned int order, int keyid,
+ int alloc_flags, const struct alloc_context *ac)
{
struct zoneref *z = ac->preferred_zoneref;
struct zone *zone;
@@ -3236,7 +3237,8 @@ get_page_from_freelist(gfp_t gfp_mask, unsigned int order, int alloc_flags,
page = rmqueue(ac->preferred_zoneref->zone, zone, order,
gfp_mask, alloc_flags, ac->migratetype);
if (page) {
- prep_new_page(page, order, gfp_mask, alloc_flags);
+ prep_new_page(page, order, keyid, gfp_mask,
+ alloc_flags);

/*
* If this is a high-order atomic allocation then check
@@ -3314,27 +3316,27 @@ void warn_alloc(gfp_t gfp_mask, nodemask_t *nodemask, const char *fmt, ...)
}

static inline struct page *
-__alloc_pages_cpuset_fallback(gfp_t gfp_mask, unsigned int order,
+__alloc_pages_cpuset_fallback(gfp_t gfp_mask, unsigned int order, int keyid,
unsigned int alloc_flags,
const struct alloc_context *ac)
{
struct page *page;

- page = get_page_from_freelist(gfp_mask, order,
+ page = get_page_from_freelist(gfp_mask, order, keyid,
alloc_flags|ALLOC_CPUSET, ac);
/*
* fallback to ignore cpuset restriction if our nodes
* are depleted
*/
if (!page)
- page = get_page_from_freelist(gfp_mask, order,
+ page = get_page_from_freelist(gfp_mask, order, keyid,
alloc_flags, ac);

return page;
}

static inline struct page *
-__alloc_pages_may_oom(gfp_t gfp_mask, unsigned int order,
+__alloc_pages_may_oom(gfp_t gfp_mask, unsigned int order, int keyid,
const struct alloc_context *ac, unsigned long *did_some_progress)
{
struct oom_control oc = {
@@ -3366,7 +3368,7 @@ __alloc_pages_may_oom(gfp_t gfp_mask, unsigned int order,
* allocation which will never fail due to oom_lock already held.
*/
page = get_page_from_freelist((gfp_mask | __GFP_HARDWALL) &
- ~__GFP_DIRECT_RECLAIM, order,
+ ~__GFP_DIRECT_RECLAIM, order, keyid,
ALLOC_WMARK_HIGH|ALLOC_CPUSET, ac);
if (page)
goto out;
@@ -3414,7 +3416,7 @@ __alloc_pages_may_oom(gfp_t gfp_mask, unsigned int order,
*/
if (gfp_mask & __GFP_NOFAIL)
page = __alloc_pages_cpuset_fallback(gfp_mask, order,
- ALLOC_NO_WATERMARKS, ac);
+ keyid, ALLOC_NO_WATERMARKS, ac);
}
out:
mutex_unlock(&oom_lock);
@@ -3430,7 +3432,7 @@ __alloc_pages_may_oom(gfp_t gfp_mask, unsigned int order,
#ifdef CONFIG_COMPACTION
/* Try memory compaction for high-order allocations before reclaim */
static struct page *
-__alloc_pages_direct_compact(gfp_t gfp_mask, unsigned int order,
+__alloc_pages_direct_compact(gfp_t gfp_mask, unsigned int order, int keyid,
unsigned int alloc_flags, const struct alloc_context *ac,
enum compact_priority prio, enum compact_result *compact_result)
{
@@ -3454,7 +3456,7 @@ __alloc_pages_direct_compact(gfp_t gfp_mask, unsigned int order,
*/
count_vm_event(COMPACTSTALL);

- page = get_page_from_freelist(gfp_mask, order, alloc_flags, ac);
+ page = get_page_from_freelist(gfp_mask, order, keyid, alloc_flags, ac);

if (page) {
struct zone *zone = page_zone(page);
@@ -3547,7 +3549,7 @@ should_compact_retry(struct alloc_context *ac, int order, int alloc_flags,
}
#else
static inline struct page *
-__alloc_pages_direct_compact(gfp_t gfp_mask, unsigned int order,
+__alloc_pages_direct_compact(gfp_t gfp_mask, unsigned int order, int keyid,
unsigned int alloc_flags, const struct alloc_context *ac,
enum compact_priority prio, enum compact_result *compact_result)
{
@@ -3656,7 +3658,7 @@ __perform_reclaim(gfp_t gfp_mask, unsigned int order,

/* The really slow allocator path where we enter direct reclaim */
static inline struct page *
-__alloc_pages_direct_reclaim(gfp_t gfp_mask, unsigned int order,
+__alloc_pages_direct_reclaim(gfp_t gfp_mask, unsigned int order, int keyid,
unsigned int alloc_flags, const struct alloc_context *ac,
unsigned long *did_some_progress)
{
@@ -3668,7 +3670,7 @@ __alloc_pages_direct_reclaim(gfp_t gfp_mask, unsigned int order,
return NULL;

retry:
- page = get_page_from_freelist(gfp_mask, order, alloc_flags, ac);
+ page = get_page_from_freelist(gfp_mask, order, keyid, alloc_flags, ac);

/*
* If an allocation failed after direct reclaim, it could be because
@@ -3914,7 +3916,7 @@ check_retry_cpuset(int cpuset_mems_cookie, struct alloc_context *ac)
}

static inline struct page *
-__alloc_pages_slowpath(gfp_t gfp_mask, unsigned int order,
+__alloc_pages_slowpath(gfp_t gfp_mask, unsigned int order, int keyid,
struct alloc_context *ac)
{
bool can_direct_reclaim = gfp_mask & __GFP_DIRECT_RECLAIM;
@@ -3979,7 +3981,7 @@ __alloc_pages_slowpath(gfp_t gfp_mask, unsigned int order,
* The adjusted alloc_flags might result in immediate success, so try
* that first
*/
- page = get_page_from_freelist(gfp_mask, order, alloc_flags, ac);
+ page = get_page_from_freelist(gfp_mask, order, keyid, alloc_flags, ac);
if (page)
goto got_pg;

@@ -3996,7 +3998,7 @@ __alloc_pages_slowpath(gfp_t gfp_mask, unsigned int order,
(costly_order ||
(order > 0 && ac->migratetype != MIGRATE_MOVABLE))
&& !gfp_pfmemalloc_allowed(gfp_mask)) {
- page = __alloc_pages_direct_compact(gfp_mask, order,
+ page = __alloc_pages_direct_compact(gfp_mask, order, keyid,
alloc_flags, ac,
INIT_COMPACT_PRIORITY,
&compact_result);
@@ -4049,7 +4051,7 @@ __alloc_pages_slowpath(gfp_t gfp_mask, unsigned int order,
}

/* Attempt with potentially adjusted zonelist and alloc_flags */
- page = get_page_from_freelist(gfp_mask, order, alloc_flags, ac);
+ page = get_page_from_freelist(gfp_mask, order, keyid, alloc_flags, ac);
if (page)
goto got_pg;

@@ -4062,14 +4064,14 @@ __alloc_pages_slowpath(gfp_t gfp_mask, unsigned int order,
goto nopage;

/* Try direct reclaim and then allocating */
- page = __alloc_pages_direct_reclaim(gfp_mask, order, alloc_flags, ac,
- &did_some_progress);
+ page = __alloc_pages_direct_reclaim(gfp_mask, order, keyid, alloc_flags,
+ ac, &did_some_progress);
if (page)
goto got_pg;

/* Try direct compaction and then allocating */
- page = __alloc_pages_direct_compact(gfp_mask, order, alloc_flags, ac,
- compact_priority, &compact_result);
+ page = __alloc_pages_direct_compact(gfp_mask, order, keyid, alloc_flags,
+ ac, compact_priority, &compact_result);
if (page)
goto got_pg;

@@ -4106,7 +4108,8 @@ __alloc_pages_slowpath(gfp_t gfp_mask, unsigned int order,
goto retry_cpuset;

/* Reclaim has failed us, start killing things */
- page = __alloc_pages_may_oom(gfp_mask, order, ac, &did_some_progress);
+ page = __alloc_pages_may_oom(gfp_mask, order, keyid,
+ ac, &did_some_progress);
if (page)
goto got_pg;

@@ -4160,7 +4163,8 @@ __alloc_pages_slowpath(gfp_t gfp_mask, unsigned int order,
* could deplete whole memory reserves which would just make
* the situation worse
*/
- page = __alloc_pages_cpuset_fallback(gfp_mask, order, ALLOC_HARDER, ac);
+ page = __alloc_pages_cpuset_fallback(gfp_mask, order, keyid,
+ ALLOC_HARDER, ac);
if (page)
goto got_pg;

@@ -4242,7 +4246,8 @@ __alloc_pages_nodemask(gfp_t gfp_mask, unsigned int order, int keyid,
finalise_ac(gfp_mask, order, &ac);

/* First allocation attempt */
- page = get_page_from_freelist(alloc_mask, order, alloc_flags, &ac);
+ page = get_page_from_freelist(alloc_mask, order, keyid,
+ alloc_flags, &ac);
if (likely(page))
goto out;

@@ -4262,7 +4267,7 @@ __alloc_pages_nodemask(gfp_t gfp_mask, unsigned int order, int keyid,
if (unlikely(ac.nodemask != nodemask))
ac.nodemask = nodemask;

- page = __alloc_pages_slowpath(alloc_mask, order, &ac);
+ page = __alloc_pages_slowpath(alloc_mask, order, keyid, &ac);

out:
if (memcg_kmem_enabled() && (gfp_mask & __GFP_ACCOUNT) && page &&
diff --git a/mm/page_isolation.c b/mm/page_isolation.c
index 165ed8117bd1..8bf0f9677093 100644
--- a/mm/page_isolation.c
+++ b/mm/page_isolation.c
@@ -131,7 +131,7 @@ static void unset_migratetype_isolate(struct page *page, unsigned migratetype)
out:
spin_unlock_irqrestore(&zone->lock, flags);
if (isolated_page) {
- post_alloc_hook(page, order, __GFP_MOVABLE);
+ post_alloc_hook(page, order, page_keyid(page), __GFP_MOVABLE);
__free_pages(page, order);
}
}
--
2.16.2
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