[RFC PATCH 13/20] x86/sgx: Prepare for multiple LRUs

Kristen Carlson Accardi
2022-09-22T17:10:50Z

From: Sean Christopherson <sean.j.christopherson-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>

Add sgx_can_reclaim() wrapper so that in a subsequent patch, multiple LRUs
can be used cleanly.

Signed-off-by: Sean Christopherson <sean.j.christopherson-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
Signed-off-by: Kristen Carlson Accardi <kristen-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>
Cc: Sean Christopherson <seanjc-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>
---
arch/x86/kernel/cpu/sgx/main.c | 9 +++++++--
1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/arch/x86/kernel/cpu/sgx/main.c b/arch/x86/kernel/cpu/sgx/main.c
index 9f2cb264a347..ac49346302ed 100644
--- a/arch/x86/kernel/cpu/sgx/main.c
+++ b/arch/x86/kernel/cpu/sgx/main.c
@@ -386,10 +386,15 @@ static int sgx_reclaim_pages(int nr_to_scan, bool ignore_age)
return i;
}

+static bool sgx_can_reclaim(void)
+{
+ return !list_empty(&sgx_global_lru.reclaimable);
+}
+
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();
}

/*
@@ -588,7 +593,7 @@ 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) {
--
2.37.3