[tip: x86/tdx] x86/virt/seamldr: Initialize the newly-installed TDX module

["tip-bot2 for Chao Gao" <tip-bot2@linutronix.de>]

The following commit has been merged into the x86/tdx branch of tip:

Commit-ID:     bf7c0ed2c3621f4f0bf56efcd95e5a5372bf0ca6
Gitweb:        https://git.kernel.org/tip/bf7c0ed2c3621f4f0bf56efcd95e5a5372bf0ca6
Author:        Chao Gao <chao.gao@intel.com>
AuthorDate:    Wed, 20 May 2026 15:29:09 -07:00
Committer:     Dave Hansen <dave.hansen@linux.intel.com>
CommitterDate: Wed, 03 Jun 2026 08:59:43 -07:00

x86/virt/seamldr: Initialize the newly-installed TDX module

Continue fleshing out the update process. At this point the new module
is sitting in memory but has never been called and is not usable. It
is in a similar state to the when the system first boots.

Leave the P-SEAMLDR behind. Stop making calls to it. Transition to
calling the new TDX module itself to set up both global and per-cpu
state.

Share tdx_cpu_enable() with the fresh-boot module initialization code.
Export it and invoke it on all CPUs.

Note: "TDX global initialization" needs to be done once before "TDX
per-CPU initialization". It would be a great fit for the new runtime
update "is_lead_cpu" logic. But tdx_cpu_enable() already has some
logic to do the global initialization properly. Just use it directly
to maximize fresh-boot and runtime update code sharing.

== Background ==

The boot-time and post-update initialization flows share the same first
steps:

- TDX global initialization
- TDX per-CPU initialization

After that, they diverge:

- Fresh boot:
   Prepare TDMRs/PAMTs
   Configure the TDX module
   Configure the global KeyID
   Initialize TDMRs
- Runtime update:
   Restore TDX module state from handoff data

Future changes will consume the handoff data.

[ dhansen: major changelog munging ]

Signed-off-by: Chao Gao <chao.gao@intel.com>
Signed-off-by: Dave Hansen <dave.hansen@linux.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>
Link: https://patch.msgid.link/20260520133909.409394-20-chao.gao@intel.com
---
 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 27376db..5d750fe 100644
--- a/arch/x86/include/asm/tdx.h
+++ b/arch/x86/include/asm/tdx.h
@@ -107,6 +107,7 @@ 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 54fa797..5fdb36b 100644
--- a/arch/x86/virt/vmx/tdx/seamldr.c
+++ b/arch/x86/virt/vmx/tdx/seamldr.c
@@ -209,6 +209,7 @@ enum module_update_state {
 	MODULE_UPDATE_START,
 	MODULE_UPDATE_SHUTDOWN,
 	MODULE_UPDATE_CPU_INSTALL,
+	MODULE_UPDATE_CPU_INIT,
 	MODULE_UPDATE_DONE,
 };
 
@@ -287,6 +288,9 @@ 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 37e52cd..080a2bc 100644
--- a/arch/x86/virt/vmx/tdx/tdx.c
+++ b/arch/x86/virt/vmx/tdx/tdx.c
@@ -113,7 +113,7 @@ out:
  * (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;