[PATCH v2 3/3] x86/virt/tdx: Print TDX Module version during init

[Chao Gao <chao.gao@intel.com>]

From: Vishal Verma <vishal.l.verma@intel.com>

Alongside exposing the TDX Module version via sysfs, it is useful to
have a record of it 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].

The log message will look like:

  virt/tdx: TDX-Module version: 1.5.24

Print this 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]

[ Chao: s/TDX module/TDX-Module in the log message
        tag print_module_version() as __init ]
Signed-off-by: Vishal Verma <vishal.l.verma@intel.com>
Signed-off-by: Chao Gao <chao.gao@intel.com>
Cc: Rick Edgecombe <rick.p.edgecombe@intel.com>
Cc: Kai Huang <kai.huang@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]
---
v2
 - new

 arch/x86/virt/vmx/tdx/tdx.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/arch/x86/virt/vmx/tdx/tdx.c b/arch/x86/virt/vmx/tdx/tdx.c
index ef77135ec373..3282dce5003b 100644
--- a/arch/x86/virt/vmx/tdx/tdx.c
+++ b/arch/x86/virt/vmx/tdx/tdx.c
@@ -352,6 +352,13 @@ static __init int read_sys_metadata_field(u64 field_id, u64 *data)
 
 #include "tdx_global_metadata.c"
 
+static __init void print_module_version(struct tdx_sys_info_version *version)
+{
+	pr_info("TDX-Module version: %u.%u.%02u\n",
+		version->major_version, version->minor_version,
+		version->update_version);
+}
+
 static __init int check_features(struct tdx_sys_info *sysinfo)
 {
 	u64 tdx_features0 = sysinfo->features.tdx_features0;
@@ -1158,6 +1165,8 @@ static __init int init_tdx_module(void)
 	if (ret)
 		return ret;
 
+	print_module_version(&tdx_sysinfo.version);
+
 	/* Check whether the kernel can support this module */
 	ret = check_features(&tdx_sysinfo);
 	if (ret)
-- 
2.47.3