[PATCH 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 allows
for a quick spot check for whether the correct/expected TDX module is
being loaded, and 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

..followed by remaining TDX initialization messages (or errors).

Print the version early in init_tdx_module(), right after the global
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.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/arch/x86/virt/vmx/tdx/tdx.c b/arch/x86/virt/vmx/tdx/tdx.c
index 5ce4ebe99774..fba00ddc11f1 100644
--- a/arch/x86/virt/vmx/tdx/tdx.c
+++ b/arch/x86/virt/vmx/tdx/tdx.c
@@ -1084,6 +1084,11 @@ static int init_tdx_module(void)
 	if (ret)
 		return ret;
 
+	pr_info("Module version: %u.%u.%02u\n",
+		tdx_sysinfo.version.major_version,
+		tdx_sysinfo.version.minor_version,
+		tdx_sysinfo.version.update_version);
+
 	/* Check whether the kernel can support this module */
 	ret = check_features(&tdx_sysinfo);
 	if (ret)

-- 
2.52.0