linux-kernel - Re: [PATCH 1/2] x86/virt/tdx: Retrieve TDX module version

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Message-ID: <934568ea-b9a0-4ea8-b62f-2edfd2e64f9f@intel.com>
Date: Wed, 1 Oct 2025 08:15:46 -0700
From: Dave Hansen <dave.hansen@...el.com>
To: Chao Gao <chao.gao@...el.com>, linux-coco@...ts.linux.dev,
 linux-kernel@...r.kernel.org, x86@...nel.org
Cc: Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>,
 Borislav Petkov <bp@...en8.de>, Dave Hansen <dave.hansen@...ux.intel.com>,
 "H. Peter Anvin" <hpa@...or.com>, "Kirill A. Shutemov" <kas@...nel.org>,
 Kai Huang <kai.huang@...el.com>, Paolo Bonzini <pbonzini@...hat.com>,
 Dan Williams <dan.j.williams@...el.com>
Subject: Re: [PATCH 1/2] x86/virt/tdx: Retrieve TDX module version

On 9/30/25 19:22, Chao Gao wrote:
> +	if (!ret && !(ret = read_sys_metadata_field(0x0800000100000003, &val)))
> +		sysinfo_version->minor_version = val;
> +	if (!ret && !(ret = read_sys_metadata_field(0x0800000100000004, &val)))
> +		sysinfo_version->major_version = val;
> +	if (!ret && !(ret = read_sys_metadata_field(0x0800000100000005, &val)))
> +		sysinfo_version->update_version = val;

Heh, how long does this take in practice to get 6 bytes of data out of
the module? When is the point that we move  over to TDH.SYS.RDALL?