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From:   Kai Huang <kai.huang@intel.com>
To:     peterz@infradead.org, kirill.shutemov@linux.intel.com,
        linux-kernel@vger.kernel.org
Cc:     dave.hansen@intel.com, tglx@linutronix.de, bp@alien8.de,
        mingo@redhat.com, hpa@zytor.com, x86@kernel.org, seanjc@google.com,
        pbonzini@redhat.com, kvm@vger.kernel.org, isaku.yamahata@intel.com,
        sathyanarayanan.kuppuswamy@linux.intel.com, kai.huang@intel.com
Subject: [PATCH 05/10] x86/tdx: Rename __tdx_module_call() to __tdcall()
Date:   Wed, 12 Jul 2023 20:55:19 +1200
Message-ID: <445bf6aa2f2c068bc542734f2b4bd18f1fee6d1d.1689151537.git.kai.huang@intel.com>
In-Reply-To: <cover.1689151537.git.kai.huang@intel.com>
References: <cover.1689151537.git.kai.huang@intel.com>
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__tdx_module_call() is only used by the TDX guest to issue TDCALL to the
TDX module.  Rename it to __tdcall() to match its behaviour, e.g., it
cannot be used to make host-side SEAMCALL.

Also rename tdx_module_call() which is a wrapper of __tdx_module_call()
to tdcall().

No functional change intended.

Signed-off-by: Kai Huang <kai.huang@intel.com>
---
 arch/x86/coco/tdx/tdcall.S | 10 +++++-----
 arch/x86/coco/tdx/tdx.c    | 20 ++++++++++----------
 arch/x86/include/asm/tdx.h |  4 ++--
 3 files changed, 17 insertions(+), 17 deletions(-)

diff --git a/arch/x86/coco/tdx/tdcall.S b/arch/x86/coco/tdx/tdcall.S
index e5d4b7d8ecd4..6aebac08f2bf 100644
--- a/arch/x86/coco/tdx/tdcall.S
+++ b/arch/x86/coco/tdx/tdcall.S
@@ -40,8 +40,8 @@
 .section .noinstr.text, "ax"
 
 /*
- * __tdx_module_call()  - Used by TDX guests to request services from
- * the TDX module (does not include VMM services) using TDCALL instruction.
+ * __tdcall()  - Used by TDX guests to request services from the TDX
+ * module (does not include VMM services) using TDCALL instruction.
  *
  * Transforms function call register arguments into the TDCALL register ABI.
  * After TDCALL operation, TDX module output is saved in @out (if it is
@@ -62,7 +62,7 @@
  *
  *-------------------------------------------------------------------------
  *
- * __tdx_module_call() function ABI:
+ * __tdcall() function ABI:
  *
  * @fn  (RDI)          - TDCALL Leaf ID,    moved to RAX
  * @rcx (RSI)          - Input parameter 1, moved to RCX
@@ -77,9 +77,9 @@
  *
  * Return status of TDCALL via RAX.
  */
-SYM_FUNC_START(__tdx_module_call)
+SYM_FUNC_START(__tdcall)
 	TDX_MODULE_CALL host=0
-SYM_FUNC_END(__tdx_module_call)
+SYM_FUNC_END(__tdcall)
 
 /*
  * TDX_HYPERCALL - Make hypercalls to a TDX VMM using TDVMCALL leaf of TDCALL
diff --git a/arch/x86/coco/tdx/tdx.c b/arch/x86/coco/tdx/tdx.c
index de021df92009..268f812ff595 100644
--- a/arch/x86/coco/tdx/tdx.c
+++ b/arch/x86/coco/tdx/tdx.c
@@ -98,10 +98,10 @@ EXPORT_SYMBOL_GPL(tdx_kvm_hypercall);
  * should only be used for calls that have no legitimate reason to fail
  * or where the kernel can not survive the call failing.
  */
-static inline void tdx_module_call(u64 fn, u64 rcx, u64 rdx, u64 r8, u64 r9,
-				   struct tdx_module_output *out)
+static inline void tdcall(u64 fn, u64 rcx, u64 rdx, u64 r8, u64 r9,
+			  struct tdx_module_output *out)
 {
-	if (__tdx_module_call(fn, rcx, rdx, r8, r9, out))
+	if (__tdcall(fn, rcx, rdx, r8, r9, out))
 		panic("TDCALL %lld failed (Buggy TDX module!)\n", fn);
 }
 
@@ -123,9 +123,9 @@ int tdx_mcall_get_report0(u8 *reportdata, u8 *tdreport)
 {
 	u64 ret;
 
-	ret = __tdx_module_call(TDG_MR_REPORT, virt_to_phys(tdreport),
-				virt_to_phys(reportdata), TDREPORT_SUBTYPE_0,
-				0, NULL);
+	ret = __tdcall(TDG_MR_REPORT, virt_to_phys(tdreport),
+			virt_to_phys(reportdata), TDREPORT_SUBTYPE_0,
+			0, NULL);
 	if (ret) {
 		if (TDCALL_RETURN_CODE(ret) == TDCALL_INVALID_OPERAND)
 			return -EINVAL;
@@ -184,7 +184,7 @@ static void tdx_parse_tdinfo(u64 *cc_mask)
 	 * Guest-Host-Communication Interface (GHCI), section 2.4.2 TDCALL
 	 * [TDG.VP.INFO].
 	 */
-	tdx_module_call(TDG_VP_INFO, 0, 0, 0, 0, &out);
+	tdcall(TDG_VP_INFO, 0, 0, 0, 0, &out);
 
 	/*
 	 * The highest bit of a guest physical address is the "sharing" bit.
@@ -626,7 +626,7 @@ void tdx_get_ve_info(struct ve_info *ve)
 	 * Note, the TDX module treats virtual NMIs as inhibited if the #VE
 	 * valid flag is set. It means that NMI=>#VE will not result in a #DF.
 	 */
-	tdx_module_call(TDG_VP_VEINFO_GET, 0, 0, 0, 0, &out);
+	tdcall(TDG_VP_VEINFO_GET, 0, 0, 0, 0, &out);
 
 	/* Transfer the output parameters */
 	ve->exit_reason = out.rcx;
@@ -768,7 +768,7 @@ static bool try_accept_one(phys_addr_t *start, unsigned long len,
 	}
 
 	tdcall_rcx = *start | page_size;
-	if (__tdx_module_call(TDG_MEM_PAGE_ACCEPT, tdcall_rcx, 0, 0, 0, NULL))
+	if (__tdcall(TDG_MEM_PAGE_ACCEPT, tdcall_rcx, 0, 0, 0, NULL))
 		return false;
 
 	*start += accept_size;
@@ -870,7 +870,7 @@ void __init tdx_early_init(void)
 	cc_set_mask(cc_mask);
 
 	/* Kernel does not use NOTIFY_ENABLES and does not need random #VEs */
-	tdx_module_call(TDG_VM_WR, 0, TDCS_NOTIFY_ENABLES, 0, -1ULL, NULL);
+	tdcall(TDG_VM_WR, 0, TDCS_NOTIFY_ENABLES, 0, -1ULL, NULL);
 
 	/*
 	 * All bits above GPA width are reserved and kernel treats shared bit
diff --git a/arch/x86/include/asm/tdx.h b/arch/x86/include/asm/tdx.h
index 28d889c9aa16..f19e329c4044 100644
--- a/arch/x86/include/asm/tdx.h
+++ b/arch/x86/include/asm/tdx.h
@@ -56,8 +56,8 @@ struct ve_info {
 void __init tdx_early_init(void);
 
 /* Used to communicate with the TDX module */
-u64 __tdx_module_call(u64 fn, u64 rcx, u64 rdx, u64 r8, u64 r9,
-		      struct tdx_module_output *out);
+u64 __tdcall(u64 fn, u64 rcx, u64 rdx, u64 r8, u64 r9,
+	     struct tdx_module_output *out);
 
 void tdx_get_ve_info(struct ve_info *ve);
 
-- 
2.41.0