[PATCH v9 17/23] x86/virt/seamldr: Do TDX per-CPU initialization after module installation

[Chao Gao]

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@xxxxxxxxx>
Reviewed-by: Xu Yilun <yilun.xu@xxxxxxxxxxxxxxx>
Reviewed-by: Tony Lindgren <tony.lindgren@xxxxxxxxxxxxxxx>
Reviewed-by: Kai Huang <kai.huang@xxxxxxxxx>
Reviewed-by: Kiryl Shutsemau (Meta) <kas@xxxxxxxxxx>
Reviewed-by: Rick Edgecombe <rick.p.edgecombe@xxxxxxxxx>
---
 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 27376db7ddac..5d750fe53669 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 9d0e7e8c6c20..e4a3271051f6 100644
--- a/arch/x86/virt/vmx/tdx/seamldr.c
+++ b/arch/x86/virt/vmx/tdx/seamldr.c
@@ -177,6 +177,7 @@ enum module_update_state {
 	MODULE_UPDATE_START,
 	MODULE_UPDATE_SHUTDOWN,
 	MODULE_UPDATE_CPU_INSTALL,
+	MODULE_UPDATE_CPU_INIT,
 	MODULE_UPDATE_DONE,
 };
 
@@ -254,6 +255,9 @@ 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 20b3b33e4677..5e54da302f2d 100644
--- a/arch/x86/virt/vmx/tdx/tdx.c
+++ b/arch/x86/virt/vmx/tdx/tdx.c
@@ -106,7 +106,7 @@ 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;
-- 
2.52.0