x86/tdx: Add more registers to struct tdx_hypercall_args

struct tdx_hypercall_args is used to pass down hypercall arguments to
__tdx_hypercall() assembly routine.

Currently __tdx_hypercall() handles up to 6 arguments. In preparation to
changes in __tdx_hypercall(), expand the structure to 6 more registers
and generate asm offsets for them.

Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com>
Link: https://lore.kernel.org/all/20230126221159.8635-3-kirill.shutemov%40linux.intel.com

diff --git a/arch/x86/include/asm/shared/tdx.h b/arch/x86/include/asm/shared/tdx.h
index e53f262..8068faa 100644 (file)
--- a/arch/x86/include/asm/shared/tdx.h
+++ b/arch/x86/include/asm/shared/tdx.h
@@ -22,12 +22,18 @@
  * This is a software only structure and not part of the TDX module/VMM ABI.
  */
 struct tdx_hypercall_args {
+       u64 r8;
+       u64 r9;
        u64 r10;
        u64 r11;
        u64 r12;
        u64 r13;
        u64 r14;
        u64 r15;
+       u64 rdi;
+       u64 rsi;
+       u64 rbx;
+       u64 rdx;
 };
 
 /* Used to request services from the VMM */

diff --git a/arch/x86/kernel/asm-offsets.c b/arch/x86/kernel/asm-offsets.c
index 82c783d..8650f29 100644 (file)
--- a/arch/x86/kernel/asm-offsets.c
+++ b/arch/x86/kernel/asm-offsets.c
@@ -75,12 +75,18 @@ static void __used common(void)
        OFFSET(TDX_MODULE_r11, tdx_module_output, r11);
 
        BLANK();
+       OFFSET(TDX_HYPERCALL_r8,  tdx_hypercall_args, r8);
+       OFFSET(TDX_HYPERCALL_r9,  tdx_hypercall_args, r9);
        OFFSET(TDX_HYPERCALL_r10, tdx_hypercall_args, r10);
        OFFSET(TDX_HYPERCALL_r11, tdx_hypercall_args, r11);
        OFFSET(TDX_HYPERCALL_r12, tdx_hypercall_args, r12);
        OFFSET(TDX_HYPERCALL_r13, tdx_hypercall_args, r13);
        OFFSET(TDX_HYPERCALL_r14, tdx_hypercall_args, r14);
        OFFSET(TDX_HYPERCALL_r15, tdx_hypercall_args, r15);
+       OFFSET(TDX_HYPERCALL_rdi, tdx_hypercall_args, rdi);
+       OFFSET(TDX_HYPERCALL_rsi, tdx_hypercall_args, rsi);
+       OFFSET(TDX_HYPERCALL_rbx, tdx_hypercall_args, rbx);
+       OFFSET(TDX_HYPERCALL_rdx, tdx_hypercall_args, rdx);
 
        BLANK();
        OFFSET(BP_scratch, boot_params, scratch);