Add sgx_can_reclaim() wrapper and encapsulate direct references to the
global LRU list in the reclaimer functions so that they can be called with
an LRU list per EPC cgroup.
Signed-off-by: Sean Christopherson <sean.j.christopherson@xxxxxxxxx>
Signed-off-by: Kristen Carlson Accardi <kristen@xxxxxxxxxxxxxxx>
Signed-off-by: Haitao Huang <haitao.huang@xxxxxxxxxxxxxxx>
Cc: Sean Christopherson <seanjc@xxxxxxxxxx>
---
V4:
- Re-organized this patch to include all changes related to
encapsulation of the global LRU
- Moved this patch to precede the EPC cgroup patch
---
arch/x86/kernel/cpu/sgx/main.c | 41 +++++++++++++++++++++++-----------
1 file changed, 28 insertions(+), 13 deletions(-)
diff --git a/arch/x86/kernel/cpu/sgx/main.c b/arch/x86/kernel/cpu/sgx/main.c
index ce316bd5e5bb..3d396fe5ec09 100644
--- a/arch/x86/kernel/cpu/sgx/main.c
+++ b/arch/x86/kernel/cpu/sgx/main.c
@@ -34,6 +34,16 @@ static DEFINE_XARRAY(sgx_epc_address_space);
*/
static struct sgx_epc_lru_lists sgx_global_lru;
+static inline struct sgx_epc_lru_lists *sgx_lru_lists(struct sgx_epc_page *epc_page)
+{
+ return &sgx_global_lru;
+}
+
+static inline bool sgx_can_reclaim(void)
+{
+ return !list_empty(&sgx_global_lru.reclaimable);
+}
+
static atomic_long_t sgx_nr_free_pages = ATOMIC_LONG_INIT(0);
/* Nodes with one or more EPC sections. */
@@ -339,6 +349,7 @@ size_t sgx_reclaim_epc_pages(size_t nr_to_scan, bool ignore_age)
struct sgx_backing backing[SGX_NR_TO_SCAN_MAX];
struct sgx_epc_page *epc_page, *tmp;
struct sgx_encl_page *encl_page;
+ struct sgx_epc_lru_lists *lru;
pgoff_t page_index;
LIST_HEAD(iso);
size_t ret;
@@ -372,10 +383,11 @@ size_t sgx_reclaim_epc_pages(size_t nr_to_scan, bool ignore_age)
continue;
skip:
- spin_lock(&sgx_global_lru.lock);
+ lru = sgx_lru_lists(epc_page);
+ spin_lock(&lru->lock);
sgx_epc_page_set_state(epc_page, SGX_EPC_PAGE_RECLAIMABLE);
- list_move_tail(&epc_page->list, &sgx_global_lru.reclaimable);
- spin_unlock(&sgx_global_lru.lock);
+ list_move_tail(&epc_page->list, &lru->reclaimable);
+ spin_unlock(&lru->lock);
kref_put(&encl_page->encl->refcount, sgx_encl_release);
}
@@ -399,7 +411,7 @@ size_t sgx_reclaim_epc_pages(size_t nr_to_scan, bool ignore_age)
static bool sgx_should_reclaim(unsigned long watermark)
{
return atomic_long_read(&sgx_nr_free_pages) < watermark &&
- !list_empty(&sgx_global_lru.reclaimable);
+ sgx_can_reclaim();
}
/*
@@ -529,14 +541,16 @@ struct sgx_epc_page *__sgx_alloc_epc_page(void)
*/
void sgx_record_epc_page(struct sgx_epc_page *page, unsigned long flags)
{
- spin_lock(&sgx_global_lru.lock);
+ struct sgx_epc_lru_lists *lru = sgx_lru_lists(page);
+
+ spin_lock(&lru->lock);
WARN_ON_ONCE(sgx_epc_page_reclaimable(page->flags));
page->flags |= flags;
if (sgx_epc_page_reclaimable(flags))
- list_add_tail(&page->list, &sgx_global_lru.reclaimable);
+ list_add_tail(&page->list, &lru->reclaimable);
else
- list_add_tail(&page->list, &sgx_global_lru.unreclaimable);
- spin_unlock(&sgx_global_lru.lock);
+ list_add_tail(&page->list, &lru->unreclaimable);
+ spin_unlock(&lru->lock);
}
/**
@@ -551,15 +565,16 @@ void sgx_record_epc_page(struct sgx_epc_page *page, unsigned long flags)
*/
int sgx_drop_epc_page(struct sgx_epc_page *page)
{
- spin_lock(&sgx_global_lru.lock);
+ struct sgx_epc_lru_lists *lru = sgx_lru_lists(page);
+
+ spin_lock(&lru->lock);
if (sgx_epc_page_reclaim_in_progress(page->flags)) {
- spin_unlock(&sgx_global_lru.lock);
+ spin_unlock(&lru->lock);
return -EBUSY;
}
-
list_del(&page->list);
sgx_epc_page_reset_state(page);
- spin_unlock(&sgx_global_lru.lock);
+ spin_unlock(&lru->lock);
return 0;
}
@@ -592,7 +607,7 @@ struct sgx_epc_page *sgx_alloc_epc_page(void *owner, bool reclaim)
break;
}
- if (list_empty(&sgx_global_lru.reclaimable))
+ if (!sgx_can_reclaim())
return ERR_PTR(-ENOMEM);
if (!reclaim) {
--
2.25.1
