Re: [PATCH v4 01/16] x86/tdx: Move all TDX error defines into <asm/shared/tdx_errno.h>

["Huang, Kai" <kai.huang@intel.com>]

> --- a/arch/x86/kvm/vmx/tdx_errno.h
> +++ b/arch/x86/include/asm/shared/tdx_errno.h
> @@ -1,14 +1,16 @@
>  /* SPDX-License-Identifier: GPL-2.0 */
> -/* architectural status code for SEAMCALL */
> +#ifndef _X86_SHARED_TDX_ERRNO_H
> +#define _X86_SHARED_TDX_ERRNO_H

AFAICT other files under asm/shared/ all use

  #ifdef  _ASM_X86_SHARED_xx_H
  ...

I guess it's better to follow this pattern.

>  
> -#ifndef __KVM_X86_TDX_ERRNO_H
> -#define __KVM_X86_TDX_ERRNO_H
> +#include <asm/trapnr.h>
>  
> +/* Upper 32 bit of the TDX error code encodes the status */
>  #define TDX_SEAMCALL_STATUS_MASK		0xFFFFFFFF00000000ULL
>  
>  /*
> - * TDX SEAMCALL Status Codes (returned in RAX)
> + * TDX SEAMCALL Status Codes

Nit:

I don't quite follow this change.  Just curious: is it because "returned in RAX"
doesn't apply to all error codes any more?

>   */
> +#define TDX_SUCCESS				0ULL
>  #define TDX_NON_RECOVERABLE_VCPU		0x4000000100000000ULL
>  #define TDX_NON_RECOVERABLE_TD			0x4000000200000000ULL
>  #define TDX_NON_RECOVERABLE_TD_NON_ACCESSIBLE	0x6000000500000000ULL
> @@ -17,6 +19,7 @@
>  #define TDX_OPERAND_INVALID			0xC000010000000000ULL
>  #define TDX_OPERAND_BUSY			0x8000020000000000ULL
>  #define TDX_PREVIOUS_TLB_EPOCH_BUSY		0x8000020100000000ULL
> +#define TDX_RND_NO_ENTROPY			0x8000020300000000ULL
>  #define TDX_PAGE_METADATA_INCORRECT		0xC000030000000000ULL
>  #define TDX_VCPU_NOT_ASSOCIATED			0x8000070200000000ULL
>  #define TDX_KEY_GENERATION_FAILED		0x8000080000000000ULL
> @@ -28,6 +31,20 @@
>  #define TDX_EPT_ENTRY_STATE_INCORRECT		0xC0000B0D00000000ULL
>  #define TDX_METADATA_FIELD_NOT_READABLE		0xC0000C0200000000ULL
>  
> +/*
> + * SW-defined error codes.
> + *
> + * Bits 47:40 == 0xFF indicate Reserved status code class that never used by
> + * TDX module.
> + */
> +#define TDX_ERROR			_BITULL(63)
> +#define TDX_NON_RECOVERABLE		_BITULL(62)
> +#define TDX_SW_ERROR			(TDX_ERROR | GENMASK_ULL(47, 40))
> +#define TDX_SEAMCALL_VMFAILINVALID	(TDX_SW_ERROR | _ULL(0xFFFF0000))
> +
> +#define TDX_SEAMCALL_GP			(TDX_SW_ERROR | X86_TRAP_GP)
> +#define TDX_SEAMCALL_UD			(TDX_SW_ERROR | X86_TRAP_UD)
> +
>  /*
>   * TDX module operand ID, appears in 31:0 part of error code as
>   * detail information
> @@ -37,4 +54,4 @@
>  #define TDX_OPERAND_ID_SEPT			0x92
>  #define TDX_OPERAND_ID_TD_EPOCH			0xa9
>  
> -#endif /* __KVM_X86_TDX_ERRNO_H */
> +#endif /* _X86_SHARED_TDX_ERRNO_H */
> diff --git a/arch/x86/include/asm/tdx.h b/arch/x86/include/asm/tdx.h
> index 6b338d7f01b7..2f3e16b93b4c 100644
> --- a/arch/x86/include/asm/tdx.h
> +++ b/arch/x86/include/asm/tdx.h
> @@ -12,26 +12,6 @@
>  #include <asm/trapnr.h>

I think you can remove <asm/trapnr.h> here since now <asm/tdx.h> is no longer
using any definitions from it.  And <asm/shared/tdx_errno.h> now includes it
directly.