linux-kernel - Re: [PATCH v3] x86/tdx: Dump TDX version During the TD Bootup

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Date:   Mon, 2 Oct 2023 13:38:48 +0300
From:   kirill.shutemov@...ux.intel.com
To:     Yi Sun <yi.sun@...el.com>
Cc:     sathyanarayanan.kuppuswamy@...ux.intel.com,
        linux-kernel@...r.kernel.org, heng.su@...el.com,
        yi.sun@...ux.intel.com, Dongcheng Yan <dongcheng.yan@...el.com>,
        x86@...nel.org
Subject: Re: [PATCH v3] x86/tdx: Dump TDX version During the TD Bootup

On Sun, Oct 01, 2023 at 12:11:10AM +0800, Yi Sun wrote:
> It is essential for TD users to be aware of the vendor and version of
> the current TDX. Additionally, they can reference the TDX version when
> reporting bugs or issues.
> 
> Furthermore, the applications or device drivers running in TD can achieve
> enhanced reliability and flexibility by following the TDX Module ABI
> specification, because there are significant differences between different
> versions of TDX, as mentioned in the "Intel® TDX Module Incompatibilities
> between v1.0 and v1.5" reference. Here are a few examples:
> 
> MSR Name		Index		Reason
> ----------------------------------------------
> IA32_UARCH_MISC_CTL	0x1B01		From v1.5
> IA32_ARCH_CAPABILITIES	0x010A		Changed in v1.5
> IA32_TSX_CTRL		0x0122		Changed in v1.5
> 
> CPUID Leaf	Sub-leaf	Reason
> ---------------------------------------
> 0x7		2		From v1.5
> 0x22		0		From v1.5
> 0x23		0~3		From v1.5
> 0x80000007	0		From v1.5
> 
> During TD initialization, the TDX version info can be obtained by calling
> TDG.SYS.RD. This will fetch the current version of TDX, including the major
> and minor version numbers and vendor ID.
> 
> The TDCALL TDG.SYS.RD originates from TDX version 1.5. If the error
> TDCALL_INVALID_OPERAND occurs, it should be treated as TDX version 1.0.
> 
> Co-developed-by: Dongcheng Yan <dongcheng.yan@...el.com>
> Signed-off-by: Dongcheng Yan <dongcheng.yan@...el.com>
> Signed-off-by: Yi Sun <yi.sun@...el.com>

Looks good to me.

Reviewed-by: Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>

But you need to send it to x86 maintainers. I've CCed x86@, but you might
need to resend it properly to maintainers.

-- 
  Kiryl Shutsemau / Kirill A. Shutemov