x86/virt/tdx: Print TDX module version during init

It is useful to print the TDX module version in dmesg logs. This is
currently the only way to determine the module version from the host. It
also creates a record for any future problems being investigated. This
was also requested in [1].

Include the version in the log messages during init, e.g.:

  virt/tdx: TDX module version: 1.5.24
  virt/tdx: 1034220 KB allocated for PAMT
  virt/tdx: module initialized

Print the version in get_tdx_sys_info(), right after the version
metadata is read, which makes it available even if there are subsequent
initialization failures.

Based on a patch by Kai Huang <kai.huang@intel.com> [2]

Signed-off-by: Vishal Verma <vishal.l.verma@intel.com>
Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com>
Reviewed-by: Chao Gao <chao.gao@intel.com>
Reviewed-by: Tony Lindgren <tony.lindgren@linux.intel.com>
Reviewed-by: Kiryl Shutsemau <kas@kernel.org>
Reviewed-by: Binbin Wu <binbin.wu@linux.intel.com>
Reviewed-by: Xiaoyao Li <xiaoyao.li@intel.com>
Reviewed-by: Rick Edgecombe <rick.p.edgecombe@intel.com>
Reviewed-by: Kai Huang <kai.huang@intel.com>
Link: https://lore.kernel.org/all/CAGtprH8eXwi-TcH2+-Fo5YdbEwGmgLBh9ggcDvd6N=bsKEJ_WQ@mail.gmail.com/
Link: https://lore.kernel.org/all/6b5553756f56a8e3222bfc36d0bdb3e5192137b7.1731318868.git.kai.huang@intel.com
Link: https://patch.msgid.link/20260109-tdx_print_module_version-v2-2-e10e4ca5b450@intel.com

diff --git a/arch/x86/virt/vmx/tdx/tdx_global_metadata.c b/arch/x86/virt/vmx/tdx/tdx_global_metadata.c
index 0454124803f360c376aa8eccf8c96f4ef63e6c4c..4c9917a9c2c39ad727fb0bd20233d8ba4be9a76d 100644 (file)
--- a/arch/x86/virt/vmx/tdx/tdx_global_metadata.c
+++ b/arch/x86/virt/vmx/tdx/tdx_global_metadata.c
@@ -105,6 +105,12 @@ static int get_tdx_sys_info(struct tdx_sys_info *sysinfo)
        int ret = 0;
 
        ret = ret ?: get_tdx_sys_info_version(&sysinfo->version);
+
+       pr_info("Module version: %u.%u.%02u\n",
+               sysinfo->version.major_version,
+               sysinfo->version.minor_version,
+               sysinfo->version.update_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);