linux-kernel - [PATCH v3 03/28] x86/sgx: Add 'struct sgx_epc_lru

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Date:   Wed, 12 Jul 2023 16:01:37 -0700
From:   Haitao Huang <haitao.huang@...ux.intel.com>
To:     jarkko@...nel.org, dave.hansen@...ux.intel.com, tj@...nel.org,
        linux-kernel@...r.kernel.org, linux-sgx@...r.kernel.org,
        cgroups@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        x86@...nel.org, "H. Peter Anvin" <hpa@...or.com>
Cc:     kai.huang@...el.com, reinette.chatre@...el.com,
        Kristen Carlson Accardi <kristen@...ux.intel.com>,
        zhiquan1.li@...el.com, seanjc@...gle.com
Subject: [PATCH v3 03/28] x86/sgx: Add 'struct sgx_epc_lru_lists' to encapsulate lru list(s)

From: Kristen Carlson Accardi <kristen@...ux.intel.com>

Introduce a data structure to wrap the existing reclaimable list
and its spinlock in a struct to minimize the code changes needed
to handle multiple LRUs as well as reclaimable and non-reclaimable
lists. The new structure will be used in a following set of patches to
implement SGX EPC cgroups.

The changes to the structure needed for unreclaimable lists will be
added in later patches.

Signed-off-by: Sean Christopherson <sean.j.christopherson@...el.com>
Signed-off-by: Kristen Carlson Accardi <kristen@...ux.intel.com>
Signed-off-by: Haitao Huang <haitao.huang@...ux.intel.com>
Cc: Sean Christopherson <seanjc@...gle.com>

V3:
Removed the helper functions and revised commit messages
---
 arch/x86/kernel/cpu/sgx/sgx.h | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/arch/x86/kernel/cpu/sgx/sgx.h b/arch/x86/kernel/cpu/sgx/sgx.h
index f6e3c5810eef..77fceba73a25 100644
--- a/arch/x86/kernel/cpu/sgx/sgx.h
+++ b/arch/x86/kernel/cpu/sgx/sgx.h
@@ -92,6 +92,23 @@ static inline void *sgx_get_epc_virt_addr(struct sgx_epc_page *page)
 	return section->virt_addr + index * PAGE_SIZE;
 }
 
+/*
+ * This data structure wraps a list of reclaimable EPC pages, and a list of
+ * non-reclaimable EPC pages and is used to implement a LRU policy during
+ * reclamation.
+ */
+struct sgx_epc_lru_lists {
+	/* Must acquire this lock to access */
+	spinlock_t lock;
+	struct list_head reclaimable;
+};
+
+static inline void sgx_lru_init(struct sgx_epc_lru_lists *lrus)
+{
+	spin_lock_init(&lrus->lock);
+	INIT_LIST_HEAD(&lrus->reclaimable);
+}
+
 struct sgx_epc_page *__sgx_alloc_epc_page(void);
 void sgx_free_epc_page(struct sgx_epc_page *page);
 
-- 
2.25.1