[PATCH v2 2/2] x86/virt/tdx: Print TDX module version during init

[Vishal Verma <vishal.l.verma@intel.com>]

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>
Reviewed-by: Chao Gao <chao.gao@intel.com>
Cc: Chao Gao <chao.gao@intel.com>
Cc: Rick Edgecombe <rick.p.edgecombe@intel.com>
Cc: Kai Huang <kai.huang@intel.com>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Dan Williams <dan.j.williams@intel.com>
Link: https://lore.kernel.org/all/CAGtprH8eXwi-TcH2+-Fo5YdbEwGmgLBh9ggcDvd6N=bsKEJ_WQ@mail.gmail.com/ # [1]
Link: https://lore.kernel.org/all/6b5553756f56a8e3222bfc36d0bdb3e5192137b7.1731318868.git.kai.huang@intel.com # [2]
---
 arch/x86/virt/vmx/tdx/tdx_global_metadata.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/arch/x86/virt/vmx/tdx/tdx_global_metadata.c b/arch/x86/virt/vmx/tdx/tdx_global_metadata.c
index 0454124803f3..4c9917a9c2c3 100644
--- 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);

-- 
2.52.0