Merge tag 'tsm-for-6.7' of git://git.kernel.org/pub/scm/linux/kernel/git/djbw/linux

[thirdparty/linux.git] / arch / x86 / include / asm / shared / tdx.h

diff --git a/arch/x86/include/asm/shared/tdx.h b/arch/x86/include/asm/shared/tdx.h
index 9eab19950f395ef0d49dfa7c000d38c1f28551d1..ccce7ebd8677287359c4de9271fe29ecf6793d31 100644 (file)
--- a/arch/x86/include/asm/shared/tdx.h
+++ b/arch/x86/include/asm/shared/tdx.h
@@ -11,11 +11,12 @@
 #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
+#define TDG_VP_VMCALL                  0
+#define TDG_VP_INFO                    1
+#define TDG_VP_VEINFO_GET              3
+#define TDG_MR_REPORT                  4
+#define TDG_MEM_PAGE_ACCEPT            6
+#define TDG_VM_WR                      8
 
 /* TDCS fields. To be used by TDG.VM.WR and TDG.VM.RD module calls */
 #define TDCS_NOTIFY_ENABLES            0x9100000000000010
@@ -25,32 +26,70 @@
 #define TDVMCALL_GET_QUOTE             0x10002
 #define TDVMCALL_REPORT_FATAL_ERROR    0x10003
 
+#define TDVMCALL_STATUS_RETRY          1
+
+/*
+ * Bitmasks of exposed registers (with VMM).
+ */
+#define TDX_RDX                BIT(2)
+#define TDX_RBX                BIT(3)
+#define TDX_RSI                BIT(6)
+#define TDX_RDI                BIT(7)
+#define TDX_R8         BIT(8)
+#define TDX_R9         BIT(9)
+#define TDX_R10                BIT(10)
+#define TDX_R11                BIT(11)
+#define TDX_R12                BIT(12)
+#define TDX_R13                BIT(13)
+#define TDX_R14                BIT(14)
+#define TDX_R15                BIT(15)
+
+/*
+ * These registers are clobbered to hold arguments for each
+ * TDVMCALL. They are safe to expose to the VMM.
+ * Each bit in this mask represents a register ID. Bit field
+ * details can be found in TDX GHCI specification, section
+ * titled "TDCALL [TDG.VP.VMCALL] leaf".
+ */
+#define TDVMCALL_EXPOSE_REGS_MASK      \
+       (TDX_RDX | TDX_RBX | TDX_RSI | TDX_RDI | TDX_R8  | TDX_R9  | \
+        TDX_R10 | TDX_R11 | TDX_R12 | TDX_R13 | TDX_R14 | TDX_R15)
+
 #ifndef __ASSEMBLY__
 
+#include <linux/compiler_attributes.h>
+
 /*
- * Used in __tdx_hypercall() to pass down and get back registers' values of
- * the TDCALL instruction when requesting services from the VMM.
- *
- * This is a software only structure and not part of the TDX module/VMM ABI.
+ * Used in __tdcall*() to gather the input/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_hypercall_args {
+struct tdx_module_args {
+       /* callee-clobbered */
+       u64 rcx;
+       u64 rdx;
        u64 r8;
        u64 r9;
+       /* extra callee-clobbered */
        u64 r10;
        u64 r11;
+       /* callee-saved + rdi/rsi */
        u64 r12;
        u64 r13;
        u64 r14;
        u64 r15;
+       u64 rbx;
        u64 rdi;
        u64 rsi;
-       u64 rbx;
-       u64 rdx;
 };
 
+/* Used to communicate with the TDX module */
+u64 __tdcall(u64 fn, struct tdx_module_args *args);
+u64 __tdcall_ret(u64 fn, struct tdx_module_args *args);
+u64 __tdcall_saved_ret(u64 fn, struct tdx_module_args *args);
+
 /* Used to request services from the VMM */
-u64 __tdx_hypercall(struct tdx_hypercall_args *args);
-u64 __tdx_hypercall_ret(struct tdx_hypercall_args *args);
+u64 __tdx_hypercall(struct tdx_module_args *args);
 
 /*
  * Wrapper for standard use of __tdx_hypercall with no output aside from
@@ -58,7 +97,7 @@ u64 __tdx_hypercall_ret(struct tdx_hypercall_args *args);
  */
 static inline u64 _tdx_hypercall(u64 fn, u64 r12, u64 r13, u64 r14, u64 r15)
 {
-       struct tdx_hypercall_args args = {
+       struct tdx_module_args args = {
                .r10 = TDX_HYPERCALL_STANDARD,
                .r11 = fn,
                .r12 = r12,
@@ -72,25 +111,7 @@ static inline u64 _tdx_hypercall(u64 fn, u64 r12, u64 r13, u64 r14, u64 r15)
 
 
 /* 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);
+void __noreturn __tdx_hypercall_failed(void);
 
 bool tdx_accept_memory(phys_addr_t start, phys_addr_t end);