linux-kernel - [PATCH v3 14/28] x86/sgx: Expose sgx_reclaim

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Message-Id: <20230712230202.47929-15-haitao.huang@linux.intel.com>
Date:   Wed, 12 Jul 2023 16:01:48 -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,
        Sean Christopherson <sean.j.christopherson@...el.com>,
        zhiquan1.li@...el.com, kristen@...ux.intel.com, seanjc@...gle.com
Subject: [PATCH v3 14/28] x86/sgx: Expose sgx_reclaim_pages() for use by EPC cgroup

From: Sean Christopherson <sean.j.christopherson@...el.com>

Expose the top-level reclaim function as sgx_reclaim_epc_pages() for use
by the upcoming EPC cgroup, which will initiate reclaim to enforce
changes to high/max limits.

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>
---
 arch/x86/kernel/cpu/sgx/main.c | 10 +++++-----
 arch/x86/kernel/cpu/sgx/sgx.h  |  1 +
 2 files changed, 6 insertions(+), 5 deletions(-)

diff --git a/arch/x86/kernel/cpu/sgx/main.c b/arch/x86/kernel/cpu/sgx/main.c
index a829555b9675..e9c9e0d97300 100644
--- a/arch/x86/kernel/cpu/sgx/main.c
+++ b/arch/x86/kernel/cpu/sgx/main.c
@@ -289,7 +289,7 @@ static void sgx_reclaimer_write(struct sgx_epc_page *epc_page,
 }
 
 /**
- * sgx_reclaim_pages() - Reclaim EPC pages from the consumers
+ * sgx_reclaim_epc_pages() - Reclaim EPC pages from the consumers
  * @nr_to_scan:		 Number of EPC pages to scan for reclaim
  * @ignore_age:		 Reclaim a page even if it is young
  *
@@ -305,7 +305,7 @@ static void sgx_reclaimer_write(struct sgx_epc_page *epc_page,
  * problematic as it would increase the lock contention too much, which would
  * halt forward progress.
  */
-static size_t sgx_reclaim_pages(size_t nr_to_scan, bool ignore_age)
+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;
@@ -409,7 +409,7 @@ static bool sgx_should_reclaim(unsigned long watermark)
 void sgx_reclaim_direct(void)
 {
 	if (sgx_should_reclaim(SGX_NR_LOW_PAGES))
-		sgx_reclaim_pages(SGX_NR_TO_SCAN, false);
+		sgx_reclaim_epc_pages(SGX_NR_TO_SCAN, false);
 }
 
 static int ksgxd(void *p)
@@ -432,7 +432,7 @@ static int ksgxd(void *p)
 				     sgx_should_reclaim(SGX_NR_HIGH_PAGES));
 
 		if (sgx_should_reclaim(SGX_NR_HIGH_PAGES))
-			sgx_reclaim_pages(SGX_NR_TO_SCAN, false);
+			sgx_reclaim_epc_pages(SGX_NR_TO_SCAN, false);
 
 		cond_resched();
 	}
@@ -607,7 +607,7 @@ struct sgx_epc_page *sgx_alloc_epc_page(void *owner, bool reclaim)
 			break;
 		}
 
-		sgx_reclaim_pages(SGX_NR_TO_SCAN, false);
+		sgx_reclaim_epc_pages(SGX_NR_TO_SCAN, false);
 		cond_resched();
 	}
 
diff --git a/arch/x86/kernel/cpu/sgx/sgx.h b/arch/x86/kernel/cpu/sgx/sgx.h
index f26ed4c0d12f..98d3b15341b1 100644
--- a/arch/x86/kernel/cpu/sgx/sgx.h
+++ b/arch/x86/kernel/cpu/sgx/sgx.h
@@ -175,6 +175,7 @@ void sgx_reclaim_direct(void);
 void sgx_record_epc_page(struct sgx_epc_page *page, unsigned long flags);
 int sgx_drop_epc_page(struct sgx_epc_page *page);
 struct sgx_epc_page *sgx_alloc_epc_page(void *owner, bool reclaim);
+size_t sgx_reclaim_epc_pages(size_t nr_to_scan, bool ignore_age);
 
 void sgx_ipi_cb(void *info);
 
-- 
2.25.1