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x86/virt/tdx: Refresh TDX module version after update

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The kernel exposes the TDX module version through sysfs so userspace
can check update compatibility. That information needs to remain
accurate across runtime updates.

A runtime update may change the module's update_version, so refresh
the cached version right after a successful update.

Drop __ro_after_init from tdx_sysinfo because it is now updated at
runtime.

Do not refresh the rest of tdx_sysinfo, even if some values change
across updates. TDX module updates are backward compatible, so
existing tdx_sysinfo consumers, such as KVM, can continue to operate
without seeing the new values.

[ dhansen: trim changelog ]

Signed-off-by: Chao Gao <chao.gao@intel.com>
Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com>
Reviewed-by: Rick Edgecombe <rick.p.edgecombe@intel.com>
Link: https://patch.msgid.link/20260520133909.409394-22-chao.gao@intel.com
This commit is contained in:
Chao Gao
2026-05-20 15:29:12 -07:00
committed by Dave Hansen
parent 8d1376e6b0
commit 856bc8bb99
2 changed files with 9 additions and 2 deletions
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9
arch/x86/virt/vmx/tdx/tdx.c
View File

@@ -67,7 +67,7 @@ static struct tdmr_info_list tdx_tdmr_list;
/* All TDX-usable memory regions. Protected by mem_hotplug_lock. */
static LIST_HEAD(tdx_memlist);
static struct tdx_sys_info tdx_sysinfo __ro_after_init;
static struct tdx_sys_info tdx_sysinfo;
static DEFINE_RAW_SPINLOCK(sysinit_lock);
@@ -1321,6 +1321,13 @@ int tdx_module_run_update(void)
if (ret)
return ret;
ret = get_tdx_sys_info_version(&tdx_sysinfo.version);
/*
* Only fails if there is something unexpected
* and severely wrong with the module.
*/
WARN_ON_ONCE(ret);
tdx_module_state.initialized = true;
return 0;
}

2
arch/x86/virt/vmx/tdx/tdx_global_metadata.c
View File

@@ -7,7 +7,7 @@
* Include this file to other C file instead.
*/
static __init int get_tdx_sys_info_version(struct tdx_sys_info_version *sysinfo_version)
static int get_tdx_sys_info_version(struct tdx_sys_info_version *sysinfo_version)
{
int ret = 0;
u64 val;