[tip: x86/sgx] x86/sgx: Make sgx_ipi_cb() available internally

[tip-bot2 for Reinette Chatre]

The following commit has been merged into the x86/sgx branch of tip:

Commit-ID:     c7c6a8a61b0066ba7e891783032dc2a7873c6dc7
Gitweb:        https://git.kernel.org/tip/c7c6a8a61b0066ba7e891783032dc2a7873c6dc7
Author:        Reinette Chatre <reinette.chatre@xxxxxxxxx>
AuthorDate:    Tue, 10 May 2022 11:08:45 -07:00
Committer:     Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>
CommitterDate: Thu, 07 Jul 2022 10:13:02 -07:00

x86/sgx: Make sgx_ipi_cb() available internally

The ETRACK function followed by an IPI to all CPUs within an enclave
is a common pattern with more frequent use in support of SGX2.

Make the (empty) IPI callback function available internally in
preparation for usage by SGX2.

Signed-off-by: Reinette Chatre <reinette.chatre@xxxxxxxxx>
Signed-off-by: Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>
Reviewed-by: Jarkko Sakkinen <jarkko@xxxxxxxxxx>
Link: https://lkml.kernel.org/r/1179ed4a9c3c1c2abf49d51bfcf2c30b493181cc.1652137848.git.reinette.chatre@xxxxxxxxx
---
 arch/x86/kernel/cpu/sgx/main.c | 2 +-
 arch/x86/kernel/cpu/sgx/sgx.h  | 2 ++
 2 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/arch/x86/kernel/cpu/sgx/main.c b/arch/x86/kernel/cpu/sgx/main.c
index 9df2221..180ad84 100644
--- a/arch/x86/kernel/cpu/sgx/main.c
+++ b/arch/x86/kernel/cpu/sgx/main.c
@@ -174,7 +174,7 @@ static int __sgx_encl_ewb(struct sgx_epc_page *epc_page, void *va_slot,
 	return ret;
 }
 
-static void sgx_ipi_cb(void *info)
+void sgx_ipi_cb(void *info)
 {
 }
 
diff --git a/arch/x86/kernel/cpu/sgx/sgx.h b/arch/x86/kernel/cpu/sgx/sgx.h
index 0f17def..b30cee4 100644
--- a/arch/x86/kernel/cpu/sgx/sgx.h
+++ b/arch/x86/kernel/cpu/sgx/sgx.h
@@ -90,6 +90,8 @@ void sgx_mark_page_reclaimable(struct sgx_epc_page *page);
 int sgx_unmark_page_reclaimable(struct sgx_epc_page *page);
 struct sgx_epc_page *sgx_alloc_epc_page(void *owner, bool reclaim);
 
+void sgx_ipi_cb(void *info);
+
 #ifdef CONFIG_X86_SGX_KVM
 int __init sgx_vepc_init(void);
 #else