linux-kernel - [PATCH v18 002/121] x86/virt/tdx: Export SEAMCALL functions

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Date: Mon, 22 Jan 2024 15:52:38 -0800
From: isaku.yamahata@...el.com
To: kvm@...r.kernel.org,
	linux-kernel@...r.kernel.org
Cc: isaku.yamahata@...el.com,
	isaku.yamahata@...il.com,
	Paolo Bonzini <pbonzini@...hat.com>,
	erdemaktas@...gle.com,
	Sean Christopherson <seanjc@...gle.com>,
	Sagi Shahar <sagis@...gle.com>,
	Kai Huang <kai.huang@...el.com>,
	chen.bo@...el.com,
	hang.yuan@...el.com,
	tina.zhang@...el.com
Subject: [PATCH v18 002/121] x86/virt/tdx: Export SEAMCALL functions

From: Kai Huang <kai.huang@...el.com>

KVM will need to make SEAMCALLs to create and run TDX guests.  Export
SEAMCALL functions for KVM to use.

Also add declaration of SEAMCALL functions to <asm/asm-prototypes.h> to
support CONFIG_MODVERSIONS=y.

Signed-off-by: Kai Huang <kai.huang@...el.com>
---
 arch/x86/include/asm/asm-prototypes.h | 1 +
 arch/x86/virt/vmx/tdx/seamcall.S      | 4 ++++
 2 files changed, 5 insertions(+)

diff --git a/arch/x86/include/asm/asm-prototypes.h b/arch/x86/include/asm/asm-prototypes.h
index b1a98fa38828..0ec572ad75f1 100644
--- a/arch/x86/include/asm/asm-prototypes.h
+++ b/arch/x86/include/asm/asm-prototypes.h
@@ -13,6 +13,7 @@
 #include <asm/preempt.h>
 #include <asm/asm.h>
 #include <asm/gsseg.h>
+#include <asm/tdx.h>
 
 #ifndef CONFIG_X86_CMPXCHG64
 extern void cmpxchg8b_emu(void);
diff --git a/arch/x86/virt/vmx/tdx/seamcall.S b/arch/x86/virt/vmx/tdx/seamcall.S
index 5b1f2286aea9..e32cf82ed47e 100644
--- a/arch/x86/virt/vmx/tdx/seamcall.S
+++ b/arch/x86/virt/vmx/tdx/seamcall.S
@@ -1,5 +1,6 @@
 /* SPDX-License-Identifier: GPL-2.0 */
 #include <linux/linkage.h>
+#include <linux/export.h>
 #include <asm/frame.h>
 
 #include "tdxcall.S"
@@ -21,6 +22,7 @@
 SYM_FUNC_START(__seamcall)
 	TDX_MODULE_CALL host=1
 SYM_FUNC_END(__seamcall)
+EXPORT_SYMBOL_GPL(__seamcall);
 
 /*
  * __seamcall_ret() - Host-side interface functions to SEAM software
@@ -40,6 +42,7 @@ SYM_FUNC_END(__seamcall)
 SYM_FUNC_START(__seamcall_ret)
 	TDX_MODULE_CALL host=1 ret=1
 SYM_FUNC_END(__seamcall_ret)
+EXPORT_SYMBOL_GPL(__seamcall_ret);
 
 /*
  * __seamcall_saved_ret() - Host-side interface functions to SEAM software
@@ -59,3 +62,4 @@ SYM_FUNC_END(__seamcall_ret)
 SYM_FUNC_START(__seamcall_saved_ret)
 	TDX_MODULE_CALL host=1 ret=1 saved=1
 SYM_FUNC_END(__seamcall_saved_ret)
+EXPORT_SYMBOL_GPL(__seamcall_saved_ret);
-- 
2.25.1