diff --git a/tools/testing/selftests/kvm/lib/x86_64/tdx/tdcall.S b/tools/testing/selftests/kvm/lib/x86_64/tdx/tdcall.S new file mode 100644 index 000000000000..df9c1ed4bb2d --- /dev/null +++ b/tools/testing/selftests/kvm/lib/x86_64/tdx/tdcall.S @@ -0,0 +1,90 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* Adapted from arch/x86/coco/tdx/tdcall.S */
+#define TDX_HYPERCALL_r10 0 /* offsetof(struct tdx_hypercall_args, r10) */ +#define TDX_HYPERCALL_r11 8 /* offsetof(struct tdx_hypercall_args, r11) */ +#define TDX_HYPERCALL_r12 16 /* offsetof(struct tdx_hypercall_args, r12) */ +#define TDX_HYPERCALL_r13 24 /* offsetof(struct tdx_hypercall_args, r13) */ +#define TDX_HYPERCALL_r14 32 /* offsetof(struct tdx_hypercall_args, r14) */ +#define TDX_HYPERCALL_r15 40 /* offsetof(struct tdx_hypercall_args, r15) */
+/*
- Bitmasks of exposed registers (with VMM).
- */
+#define TDX_R10 0x400 +#define TDX_R11 0x800 +#define TDX_R12 0x1000 +#define TDX_R13 0x2000 +#define TDX_R14 0x4000 +#define TDX_R15 0x8000
+#define TDX_HCALL_HAS_OUTPUT 0x1
+/*
- 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_R10 | TDX_R11 | \
TDX_R12 | TDX_R13 | \TDX_R14 | TDX_R15 )+.code64 +.section .text
+.globl __tdx_hypercall +.type __tdx_hypercall, @function +__tdx_hypercall:
- /* Set up stack frame */
- push %rbp
- movq %rsp, %rbp
- /* Save callee-saved GPRs as mandated by the x86_64 ABI */
- push %r15
- push %r14
- push %r13
- push %r12
- /* Mangle function call ABI into TDCALL ABI: */
- /* Set TDCALL leaf ID (TDVMCALL (0)) in RAX */
- xor %eax, %eax
- /* Copy hypercall registers from arg struct: */
- movq TDX_HYPERCALL_r10(%rdi), %r10
- movq TDX_HYPERCALL_r11(%rdi), %r11
- movq TDX_HYPERCALL_r12(%rdi), %r12
- movq TDX_HYPERCALL_r13(%rdi), %r13
- movq TDX_HYPERCALL_r14(%rdi), %r14
- movq TDX_HYPERCALL_r15(%rdi), %r15
- movl $TDVMCALL_EXPOSE_REGS_MASK, %ecx
- tdcall
Looks there's a missing of definition for tdcall, and will produce below error: lib/x86_64/tdx/tdcall.S:65: Error: no such instruction: `tdcall'
I pulled the code https://github.com/googleprodkernel/linux-cc.git with branch tdx-selftests-rfc-v5.
Fixed by adding a line in tdcall.S in my side. #define tdcall .byte 0x66,0x0f,0x01,0xcc
- /* TDVMCALL leaf return code is in R10 */
- movq %r10, %rax
- /* Copy hypercall result registers to arg struct if needed */
- testq $TDX_HCALL_HAS_OUTPUT, %rsi
- jz .Lout
- movq %r10, TDX_HYPERCALL_r10(%rdi)
- movq %r11, TDX_HYPERCALL_r11(%rdi)
- movq %r12, TDX_HYPERCALL_r12(%rdi)
- movq %r13, TDX_HYPERCALL_r13(%rdi)
- movq %r14, TDX_HYPERCALL_r14(%rdi)
- movq %r15, TDX_HYPERCALL_r15(%rdi)
+.Lout:
- /* Restore callee-saved GPRs as mandated by the x86_64 ABI */
- pop %r12
- pop %r13
- pop %r14
- pop %r15
- pop %rbp
- ret
+/* Disable executable stack */