[PATCH v4 04/12] x86/tdx: Rename __tdx_module_call() to __tdcall()

Kai Huang
2023-08-15T11:03:28Z

__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>
Reviewed-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Reviewed-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.intel.com>
---
arch/x86/coco/tdx/tdcall.S | 10 +++++-----
arch/x86/coco/tdx/tdx-shared.c | 2 +-
arch/x86/coco/tdx/tdx.c | 18 +++++++++---------
arch/x86/include/asm/shared/tdx.h | 4 ++--
4 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-shared.c b/arch/x86/coco/tdx/tdx-shared.c
index f10cd3e4a04e..90631abdac34 100644
--- a/arch/x86/coco/tdx/tdx-shared.c
+++ b/arch/x86/coco/tdx/tdx-shared.c
@@ -35,7 +35,7 @@ static unsigned long 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 0;

return accept_size;
diff --git a/arch/x86/coco/tdx/tdx.c b/arch/x86/coco/tdx/tdx.c
index 05785df66b1c..8c13944925e3 100644
--- a/arch/x86/coco/tdx/tdx.c
+++ b/arch/x86/coco/tdx/tdx.c
@@ -66,10 +66,10 @@ 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);
}

@@ -91,9 +91,9 @@ 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;
@@ -152,7 +152,7 @@ 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.
@@ -594,7 +594,7 @@ 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;
@@ -774,7 +774,7 @@ 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/shared/tdx.h b/arch/x86/include/asm/shared/tdx.h
index 78f109446da6..9e3699b751ef 100644
--- a/arch/x86/include/asm/shared/tdx.h
+++ b/arch/x86/include/asm/shared/tdx.h
@@ -88,8 +88,8 @@ struct tdx_module_output {
};

/* 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);

bool tdx_accept_memory(phys_addr_t start, phys_addr_t end);

--
2.41.0