[RFC PATCH v2.1 09/30] x86/sgx: Rename sgx_encl_ewb_cpumask() as sgx_encl_cpumask()

From: Jarkko Sakkinen <jarkko@kernel.org>
To: linux-sgx@vger.kernel.org
Cc: Nathaniel McCallum <nathaniel@profian.com>,
	Reinette Chatre <reinette.chatre@intel.com>,
	Jarkko Sakkinen <jarkko@kernel.org>,
	Dave Hansen <dave.hansen@linux.intel.com>,
	Thomas Gleixner <tglx@linutronix.de>,
	Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
	x86@kernel.org (maintainer:X86 ARCHITECTURE (32-BIT AND 64-BIT)),
	"H. Peter Anvin" <hpa@zytor.com>,
	linux-kernel@vger.kernel.org (open list:X86 ARCHITECTURE (32-BIT
	AND 64-BIT))
Subject: [RFC PATCH v2.1 09/30] x86/sgx: Rename sgx_encl_ewb_cpumask() as sgx_encl_cpumask()
Date: Fri,  4 Mar 2022 11:35:03 +0200	[thread overview]
Message-ID: <20220304093524.397485-9-jarkko@kernel.org> (raw)
In-Reply-To: <20220304093524.397485-1-jarkko@kernel.org>

From: Reinette Chatre <reinette.chatre@intel.com>

sgx_encl_ewb_cpumask() is no longer unique to the reclaimer where it
is used during the EWB ENCLS leaf function when EPC pages are written
out to main memory and sgx_encl_ewb_cpumask() is used to learn which
CPUs might have executed the enclave to ensure that TLBs are cleared.

Upcoming SGX2 enabling will use sgx_encl_ewb_cpumask() during the
EMODPR and EMODT ENCLS leaf functions that make changes to enclave
pages. The function is needed for the same reason it is used now: to
learn which CPUs might have executed the enclave to ensure that TLBs
no longer point to the changed pages.

Rename sgx_encl_ewb_cpumask() to sgx_encl_cpumask() to reflect the
broader usage.

Signed-off-by: Reinette Chatre <reinette.chatre@intel.com>
---
 arch/x86/kernel/cpu/sgx/encl.c | 6 +++---
 arch/x86/kernel/cpu/sgx/encl.h | 2 +-
 arch/x86/kernel/cpu/sgx/main.c | 2 +-
 3 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/arch/x86/kernel/cpu/sgx/encl.c b/arch/x86/kernel/cpu/sgx/encl.c
index 353866e1b16f..54716886e804 100644
--- a/arch/x86/kernel/cpu/sgx/encl.c
+++ b/arch/x86/kernel/cpu/sgx/encl.c
@@ -596,7 +596,7 @@ int sgx_encl_mm_add(struct sgx_encl *encl, struct mm_struct *mm)
 }
 
 /**
- * sgx_encl_ewb_cpumask() - Query which CPUs might be accessing the enclave
+ * sgx_encl_cpumask() - Query which CPUs might be accessing the enclave
  * @encl: the enclave
  *
  * Some SGX functions require that no cached linear-to-physical address
@@ -621,7 +621,7 @@ int sgx_encl_mm_add(struct sgx_encl *encl, struct mm_struct *mm)
  * The following flow is used to support SGX functions that require that
  * no cached linear-to-physical address mappings are present:
  * 1) Execute ENCLS[ETRACK] to initiate hardware tracking.
- * 2) Use this function (sgx_encl_ewb_cpumask()) to query which CPUs might be
+ * 2) Use this function (sgx_encl_cpumask()) to query which CPUs might be
  *    accessing the enclave.
  * 3) Send IPI to identified CPUs, kicking them out of the enclave and
  *    thus flushing all locally cached linear-to-physical address mappings.
@@ -638,7 +638,7 @@ int sgx_encl_mm_add(struct sgx_encl *encl, struct mm_struct *mm)
  *
  * Return: cpumask of CPUs that might be accessing @encl
  */
-const cpumask_t *sgx_encl_ewb_cpumask(struct sgx_encl *encl)
+const cpumask_t *sgx_encl_cpumask(struct sgx_encl *encl)
 {
 	cpumask_t *cpumask = &encl->cpumask;
 	struct sgx_encl_mm *encl_mm;
diff --git a/arch/x86/kernel/cpu/sgx/encl.h b/arch/x86/kernel/cpu/sgx/encl.h
index 2b15615be8c6..817edefa884a 100644
--- a/arch/x86/kernel/cpu/sgx/encl.h
+++ b/arch/x86/kernel/cpu/sgx/encl.h
@@ -105,7 +105,7 @@ int sgx_encl_may_map(struct sgx_encl *encl, unsigned long start,
 
 void sgx_encl_release(struct kref *ref);
 int sgx_encl_mm_add(struct sgx_encl *encl, struct mm_struct *mm);
-const cpumask_t *sgx_encl_ewb_cpumask(struct sgx_encl *encl);
+const cpumask_t *sgx_encl_cpumask(struct sgx_encl *encl);
 int sgx_encl_get_backing(struct sgx_encl *encl, unsigned long page_index,
 			 struct sgx_backing *backing);
 void sgx_encl_put_backing(struct sgx_backing *backing, bool do_write);
diff --git a/arch/x86/kernel/cpu/sgx/main.c b/arch/x86/kernel/cpu/sgx/main.c
index d481e8b0e7bc..60b166bff7b4 100644
--- a/arch/x86/kernel/cpu/sgx/main.c
+++ b/arch/x86/kernel/cpu/sgx/main.c
@@ -249,7 +249,7 @@ static void sgx_encl_ewb(struct sgx_epc_page *epc_page,
 			 * miss cpus that entered the enclave between
 			 * generating the mask and incrementing epoch.
 			 */
-			on_each_cpu_mask(sgx_encl_ewb_cpumask(encl),
+			on_each_cpu_mask(sgx_encl_cpumask(encl),
 					 sgx_ipi_cb, NULL, 1);
 			ret = __sgx_encl_ewb(epc_page, va_slot, backing);
 		}
-- 
2.35.1

