diff options
Diffstat (limited to 'arch/x86/virt/vmx/tdx/tdxcall.S')
| -rw-r--r-- | arch/x86/virt/vmx/tdx/tdxcall.S | 29 |
1 files changed, 20 insertions, 9 deletions
diff --git a/arch/x86/virt/vmx/tdx/tdxcall.S b/arch/x86/virt/vmx/tdx/tdxcall.S index 49a54356ae99..6bdf6e137953 100644 --- a/arch/x86/virt/vmx/tdx/tdxcall.S +++ b/arch/x86/virt/vmx/tdx/tdxcall.S @@ -1,5 +1,6 @@ /* SPDX-License-Identifier: GPL-2.0 */ #include <asm/asm-offsets.h> +#include <asm/frame.h> #include <asm/tdx.h> /* @@ -18,6 +19,7 @@ * TDX module. */ .macro TDX_MODULE_CALL host:req + FRAME_BEGIN /* * R12 will be used as temporary storage for struct tdx_module_output * pointer. Since R12-R15 registers are not used by TDCALL/SEAMCALL @@ -44,7 +46,7 @@ mov %rsi, %rcx /* Leave input param 2 in RDX */ - .if \host +.if \host seamcall /* * SEAMCALL instruction is essentially a VMExit from VMX root @@ -57,13 +59,10 @@ * This value will never be used as actual SEAMCALL error code as * it is from the Reserved status code class. */ - jnc .Lno_vmfailinvalid - mov $TDX_SEAMCALL_VMFAILINVALID, %rax -.Lno_vmfailinvalid: - - .else + jc .Lseamcall_vmfailinvalid +.else tdcall - .endif +.endif /* * Fetch output pointer from stack to R12 (It is used @@ -80,7 +79,7 @@ * Other registers may contain details of the failure. */ test %r12, %r12 - jz .Lno_output_struct + jz .Lout /* Copy result registers to output struct: */ movq %rcx, TDX_MODULE_rcx(%r12) @@ -90,7 +89,19 @@ movq %r10, TDX_MODULE_r10(%r12) movq %r11, TDX_MODULE_r11(%r12) -.Lno_output_struct: +.Lout: /* Restore the state of R12 register */ pop %r12 + + FRAME_END + RET + +.if \host +.Lseamcall_vmfailinvalid: + mov $TDX_SEAMCALL_VMFAILINVALID, %rax + /* pop the unused output pointer back to %r9 */ + pop %r9 + jmp .Lout +.endif /* \host */ + .endm |