[PATCH v8 13/21] x86/virt/seamldr: Do TDX per-CPU initialization after module installation

Chao Gao
2026-04-27T15:30:06Z

After installing the new TDX module, each CPU needs to be initialized
again to make the CPU ready to run any other SEAMCALLs. So, export and
call tdx_cpu_enable() on all CPUs.

Signed-off-by: Chao Gao <chao.gao@intel.com>
Reviewed-by: Xu Yilun <yilun.xu@linux.intel.com>
Reviewed-by: Tony Lindgren <tony.lindgren@linux.intel.com>
Reviewed-by: Kai Huang <kai.huang@intel.com>
Reviewed-by: Kiryl Shutsemau (Meta) <kas@kernel.org>
Reviewed-by: Rick Edgecombe <rick.p.edgecombe@intel.com>
---
v8:
- export tdx_cpu_enable(). it is unexported by VMXON series.
---
arch/x86/include/asm/tdx.h | 1 +
arch/x86/virt/vmx/tdx/seamldr.c | 4 ++++
arch/x86/virt/vmx/tdx/tdx.c | 2 +-
3 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/arch/x86/include/asm/tdx.h b/arch/x86/include/asm/tdx.h
index 1c5981453ff8..de822ed9ef0b 100644
--- a/arch/x86/include/asm/tdx.h
+++ b/arch/x86/include/asm/tdx.h
@@ -104,6 +104,7 @@ static inline long tdx_kvm_hypercall(unsigned int nr, unsigned long p1,

#ifdef CONFIG_INTEL_TDX_HOST
void tdx_init(void);
+int tdx_cpu_enable(void);
const char *tdx_dump_mce_info(struct mce *m);
const struct tdx_sys_info *tdx_get_sysinfo(void);

diff --git a/arch/x86/virt/vmx/tdx/seamldr.c b/arch/x86/virt/vmx/tdx/seamldr.c
index 317b38c4aa19..04c7a87ac7df 100644
--- a/arch/x86/virt/vmx/tdx/seamldr.c
+++ b/arch/x86/virt/vmx/tdx/seamldr.c
@@ -212,6 +212,7 @@ enum module_update_state {
MODULE_UPDATE_START,
MODULE_UPDATE_SHUTDOWN,
MODULE_UPDATE_CPU_INSTALL,
+ MODULE_UPDATE_CPU_INIT,
MODULE_UPDATE_DONE,
};

@@ -271,6 +272,9 @@ static int do_seamldr_install_module(void *seamldr_params)
case MODULE_UPDATE_CPU_INSTALL:
ret = seamldr_install(seamldr_params);
break;
+ case MODULE_UPDATE_CPU_INIT:
+ ret = tdx_cpu_enable();
+ break;
default:
break;
}
diff --git a/arch/x86/virt/vmx/tdx/tdx.c b/arch/x86/virt/vmx/tdx/tdx.c
index ff5644f5daa4..3bbb12aefb4b 100644
--- a/arch/x86/virt/vmx/tdx/tdx.c
+++ b/arch/x86/virt/vmx/tdx/tdx.c
@@ -101,7 +101,7 @@ static int try_init_module_global(void)
* (and TDX module global initialization SEAMCALL if not done) on local cpu to
* make this cpu be ready to run any other SEAMCALLs.
*/
-static int tdx_cpu_enable(void)
+int tdx_cpu_enable(void)
{
struct tdx_module_args args = {};
int ret;
--
2.47.1