linux-kernel - [PATCH] x86/tdx: Wrap r11 argument of decompression hypercall with hcall

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Date:   Fri,  5 May 2023 15:03:32 +0300
From:   Nikolay Borisov <nik.borisov@...e.com>
To:     kirill.shutemov@...ux.intel.com
Cc:     dave.hansen@...ux.intel.com, x86@...nel.org,
        linux-kernel@...r.kernel.org,
        Nikolay Borisov <nik.borisov@...e.com>
Subject: [PATCH] x86/tdx: Wrap r11 argument of decompression hypercall with hcall_func

This just unifies the decompression  tdx-related code with the rest
of the code which invokes tdx hypercalls. No functional changes.

Signed-off-by: Nikolay Borisov <nik.borisov@...e.com>
---
 arch/x86/boot/compressed/tdx.c    |  4 ++--
 arch/x86/coco/tdx/tdx.c           | 11 -----------
 arch/x86/include/asm/shared/tdx.h | 11 +++++++++++
 3 files changed, 13 insertions(+), 13 deletions(-)

diff --git a/arch/x86/boot/compressed/tdx.c b/arch/x86/boot/compressed/tdx.c
index 2d81d3cc72a1..8841b945a1e2 100644
--- a/arch/x86/boot/compressed/tdx.c
+++ b/arch/x86/boot/compressed/tdx.c
@@ -20,7 +20,7 @@ static inline unsigned int tdx_io_in(int size, u16 port)
 {
 	struct tdx_hypercall_args args = {
 		.r10 = TDX_HYPERCALL_STANDARD,
-		.r11 = EXIT_REASON_IO_INSTRUCTION,
+		.r11 = hcall_func(EXIT_REASON_IO_INSTRUCTION),
 		.r12 = size,
 		.r13 = 0,
 		.r14 = port,
@@ -36,7 +36,7 @@ static inline void tdx_io_out(int size, u16 port, u32 value)
 {
 	struct tdx_hypercall_args args = {
 		.r10 = TDX_HYPERCALL_STANDARD,
-		.r11 = EXIT_REASON_IO_INSTRUCTION,
+		.r11 = hcall_func(EXIT_REASON_IO_INSTRUCTION),
 		.r12 = size,
 		.r13 = 1,
 		.r14 = port,
diff --git a/arch/x86/coco/tdx/tdx.c b/arch/x86/coco/tdx/tdx.c
index e146b599260f..15569bd32ed5 100644
--- a/arch/x86/coco/tdx/tdx.c
+++ b/arch/x86/coco/tdx/tdx.c
@@ -76,17 +76,6 @@ noinstr void __tdx_hypercall_failed(void)
 	panic("TDVMCALL failed. TDX module bug?");
 }
 
-/*
- * The TDG.VP.VMCALL-Instruction-execution sub-functions are defined
- * independently from but are currently matched 1:1 with VMX EXIT_REASONs.
- * Reusing the KVM EXIT_REASON macros makes it easier to connect the host and
- * guest sides of these calls.
- */
-static __always_inline u64 hcall_func(u64 exit_reason)
-{
-	return exit_reason;
-}
-
 #ifdef CONFIG_KVM_GUEST
 long tdx_kvm_hypercall(unsigned int nr, unsigned long p1, unsigned long p2,
 		       unsigned long p3, unsigned long p4)
diff --git a/arch/x86/include/asm/shared/tdx.h b/arch/x86/include/asm/shared/tdx.h
index 2631e01f6e0f..b415a24f0d48 100644
--- a/arch/x86/include/asm/shared/tdx.h
+++ b/arch/x86/include/asm/shared/tdx.h
@@ -40,5 +40,16 @@ u64 __tdx_hypercall_ret(struct tdx_hypercall_args *args);
 /* Called from __tdx_hypercall() for unrecoverable failure */
 void __tdx_hypercall_failed(void);
 
+/*
+ * The TDG.VP.VMCALL-Instruction-execution sub-functions are defined
+ * independently from but are currently matched 1:1 with VMX EXIT_REASONs.
+ * Reusing the KVM EXIT_REASON macros makes it easier to connect the host and
+ * guest sides of these calls.
+ */
+static __always_inline u64 hcall_func(u64 exit_reason)
+{
+        return exit_reason;
+}
+
 #endif /* !__ASSEMBLY__ */
 #endif /* _ASM_X86_SHARED_TDX_H */
-- 
2.34.1