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x86/virt/tdx: Retrieve TDX module version

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Each TDX module has several bits of metadata about which specific TDX
module it is. The primary bit of info is the version, which has an x.y.z
format. These represent the major version, minor version, and update
version respectively. Knowing the running TDX Module version is valuable
for bug reporting and debugging. Note that the module does expose other
pieces of version-related metadata, such as build number and date. Those
aren't retrieved for now, that can be added if needed in the future.

Retrieve the TDX Module version using the existing metadata reading
interface. Later changes will expose this information. The metadata
reading interfaces have existed for quite some time, so this will work
with older versions of the TDX module as well - i.e. this isn't a new
interface.

As a side note, the global metadata reading code was originally set up
to be auto-generated from a JSON definition [1]. However, later [2] this
was found to be unsustainable, and the autogeneration approach was
dropped in favor of just manually adding fields as needed (e.g. as in
this patch).

Signed-off-by: Chao Gao <chao.gao@intel.com>
Signed-off-by: Vishal Verma <vishal.l.verma@intel.com>
Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com>
Reviewed-by: Kiryl Shutsemau <kas@kernel.org>
Reviewed-by: Rick Edgecombe <rick.p.edgecombe@intel.com>
Reviewed-by: Binbin Wu <binbin.wu@linux.intel.com>
Reviewed-by: Tony Lindgren <tony.lindgren@linux.intel.com>
Reviewed-by: Xiaoyao Li <xiaoyao.li@intel.com>
Reviewed-by: Kai Huang <kai.huang@intel.com>
Link: https://lore.kernel.org/kvm/CABgObfYXUxqQV_FoxKjC8U3t5DnyM45nz5DpTxYZv2x_uFK_Kw@mail.gmail.com/ # [1]
Link: https://lore.kernel.org/all/1e7bcbad-eb26-44b7-97ca-88ab53467212@intel.com/ # [2]
Link: https://patch.msgid.link/20260109-tdx_print_module_version-v2-1-e10e4ca5b450@intel.com
This commit is contained in:
Chao Gao 2026-01-09 12:14:30 -07:00 committed by Dave Hansen
parent 6de23f81a5
commit 311214bf1d
2 changed files with 23 additions and 0 deletions
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7
arch/x86/include/asm/tdx_global_metadata.h
View File

@ -5,6 +5,12 @@
#include <linux/types.h>
struct tdx_sys_info_version {
u16 minor_version;
u16 major_version;
u16 update_version;
};
struct tdx_sys_info_features {
u64 tdx_features0;
};
@ -35,6 +41,7 @@ struct tdx_sys_info_td_conf {
};
struct tdx_sys_info {
struct tdx_sys_info_version version;
struct tdx_sys_info_features features;
struct tdx_sys_info_tdmr tdmr;
struct tdx_sys_info_td_ctrl td_ctrl;

16
arch/x86/virt/vmx/tdx/tdx_global_metadata.c
View File

@ -7,6 +7,21 @@
* Include this file to other C file instead.
*/
static int get_tdx_sys_info_version(struct tdx_sys_info_version *sysinfo_version)
{
int ret = 0;
u64 val;
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;
return ret;
}
static int get_tdx_sys_info_features(struct tdx_sys_info_features *sysinfo_features)
{
int ret = 0;
@ -89,6 +104,7 @@ static int get_tdx_sys_info(struct tdx_sys_info *sysinfo)
{
int ret = 0;
ret = ret ?: get_tdx_sys_info_version(&sysinfo->version);
ret = ret ?: get_tdx_sys_info_features(&sysinfo->features);
ret = ret ?: get_tdx_sys_info_tdmr(&sysinfo->tdmr);
ret = ret ?: get_tdx_sys_info_td_ctrl(&sysinfo->td_ctrl);