x86/tdx: Make _tdx_hypercall() and __tdx_module_call() available in boot stub

Memory acceptance requires a hypercall and one or multiple module calls.

Make helpers for the calls available in boot stub. It has to accept
memory where kernel image and initrd are placed.

Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: Dave Hansen <dave.hansen@linux.intel.com>
Link: https://lore.kernel.org/r/20230606142637.5171-8-kirill.shutemov@linux.intel.com

diff --git a/arch/x86/coco/tdx/tdx.c b/arch/x86/coco/tdx/tdx.c
index e146b59..e6f4c27 100644 (file)
--- a/arch/x86/coco/tdx/tdx.c
+++ b/arch/x86/coco/tdx/tdx.c
@@ -14,20 +14,6 @@
 #include <asm/insn-eval.h>
 #include <asm/pgtable.h>
 
-/* TDX module Call Leaf IDs */
-#define TDX_GET_INFO                   1
-#define TDX_GET_VEINFO                 3
-#define TDX_GET_REPORT                 4
-#define TDX_ACCEPT_PAGE                        6
-#define TDX_WR                         8
-
-/* TDCS fields. To be used by TDG.VM.WR and TDG.VM.RD module calls */
-#define TDCS_NOTIFY_ENABLES            0x9100000000000010
-
-/* TDX hypercall Leaf IDs */
-#define TDVMCALL_MAP_GPA               0x10001
-#define TDVMCALL_REPORT_FATAL_ERROR    0x10003
-
 /* MMIO direction */
 #define EPT_READ       0
 #define EPT_WRITE      1
@@ -51,24 +37,6 @@
 
 #define TDREPORT_SUBTYPE_0     0
 
-/*
- * Wrapper for standard use of __tdx_hypercall with no output aside from
- * return code.
- */
-static inline u64 _tdx_hypercall(u64 fn, u64 r12, u64 r13, u64 r14, u64 r15)
-{
-       struct tdx_hypercall_args args = {
-               .r10 = TDX_HYPERCALL_STANDARD,
-               .r11 = fn,
-               .r12 = r12,
-               .r13 = r13,
-               .r14 = r14,
-               .r15 = r15,
-       };
-
-       return __tdx_hypercall(&args);
-}
-
 /* Called from __tdx_hypercall() for unrecoverable failure */
 noinstr void __tdx_hypercall_failed(void)
 {

diff --git a/arch/x86/include/asm/shared/tdx.h b/arch/x86/include/asm/shared/tdx.h
index 2631e01..1ff0ee8 100644 (file)
--- a/arch/x86/include/asm/shared/tdx.h
+++ b/arch/x86/include/asm/shared/tdx.h
@@ -10,6 +10,20 @@
 #define TDX_CPUID_LEAF_ID      0x21
 #define TDX_IDENT              "IntelTDX    "
 
+/* TDX module Call Leaf IDs */
+#define TDX_GET_INFO                   1
+#define TDX_GET_VEINFO                 3
+#define TDX_GET_REPORT                 4
+#define TDX_ACCEPT_PAGE                        6
+#define TDX_WR                         8
+
+/* TDCS fields. To be used by TDG.VM.WR and TDG.VM.RD module calls */
+#define TDCS_NOTIFY_ENABLES            0x9100000000000010
+
+/* TDX hypercall Leaf IDs */
+#define TDVMCALL_MAP_GPA               0x10001
+#define TDVMCALL_REPORT_FATAL_ERROR    0x10003
+
 #ifndef __ASSEMBLY__
 
 /*
@@ -37,8 +51,45 @@ struct tdx_hypercall_args {
 u64 __tdx_hypercall(struct tdx_hypercall_args *args);
 u64 __tdx_hypercall_ret(struct tdx_hypercall_args *args);
 
+/*
+ * Wrapper for standard use of __tdx_hypercall with no output aside from
+ * return code.
+ */
+static inline u64 _tdx_hypercall(u64 fn, u64 r12, u64 r13, u64 r14, u64 r15)
+{
+       struct tdx_hypercall_args args = {
+               .r10 = TDX_HYPERCALL_STANDARD,
+               .r11 = fn,
+               .r12 = r12,
+               .r13 = r13,
+               .r14 = r14,
+               .r15 = r15,
+       };
+
+       return __tdx_hypercall(&args);
+}
+
+
 /* Called from __tdx_hypercall() for unrecoverable failure */
 void __tdx_hypercall_failed(void);
 
+/*
+ * Used in __tdx_module_call() to gather the output registers' values of the
+ * TDCALL instruction when requesting services from the TDX module. This is a
+ * software only structure and not part of the TDX module/VMM ABI
+ */
+struct tdx_module_output {
+       u64 rcx;
+       u64 rdx;
+       u64 r8;
+       u64 r9;
+       u64 r10;
+       u64 r11;
+};
+
+/* 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);
+
 #endif /* !__ASSEMBLY__ */
 #endif /* _ASM_X86_SHARED_TDX_H */

diff --git a/arch/x86/include/asm/tdx.h b/arch/x86/include/asm/tdx.h
index 28d889c..234197e 100644 (file)
--- a/arch/x86/include/asm/tdx.h
+++ b/arch/x86/include/asm/tdx.h
@@ -21,21 +21,6 @@
 #ifndef __ASSEMBLY__
 
 /*
- * Used to gather the output registers values of the TDCALL and SEAMCALL
- * instructions when requesting services from the TDX module.
- *
- * This is a software only structure and not part of the TDX module/VMM ABI.
- */
-struct tdx_module_output {
-       u64 rcx;
-       u64 rdx;
-       u64 r8;
-       u64 r9;
-       u64 r10;
-       u64 r11;
-};
-
-/*
  * Used by the #VE exception handler to gather the #VE exception
  * info from the TDX module. This is a software only structure
  * and not part of the TDX module/VMM ABI.
@@ -55,10 +40,6 @@ 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);
-
 void tdx_get_ve_info(struct ve_info *ve);
 
 bool tdx_handle_virt_exception(struct pt_regs *regs, struct ve_info *ve);