linux-kernel - [PATCH v2 18/21] x86/virt/seamldr: Do TDX per-CPU initialization after updates

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Message-ID: <20251001025442.427697-19-chao.gao@intel.com>
Date: Tue, 30 Sep 2025 19:53:02 -0700
From: Chao Gao <chao.gao@...el.com>
To: linux-coco@...ts.linux.dev,
	linux-kernel@...r.kernel.org,
	x86@...nel.org,
	reinette.chatre@...el.com,
	ira.weiny@...el.com,
	kai.huang@...el.com,
	dan.j.williams@...el.com,
	yilun.xu@...ux.intel.com,
	sagis@...gle.com,
	vannapurve@...gle.com,
	paulmck@...nel.org,
	nik.borisov@...e.com
Cc: Chao Gao <chao.gao@...el.com>,
	Farrah Chen <farrah.chen@...el.com>,
	"Kirill A. Shutemov" <kas@...nel.org>,
	Dave Hansen <dave.hansen@...ux.intel.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	Borislav Petkov <bp@...en8.de>,
	"H. Peter Anvin" <hpa@...or.com>
Subject: [PATCH v2 18/21] x86/virt/seamldr: Do TDX per-CPU initialization after updates

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

Signed-off-by: Chao Gao <chao.gao@...el.com>
Tested-by: Farrah Chen <farrah.chen@...el.com>
---
 arch/x86/virt/vmx/tdx/seamldr.c | 4 ++++
 arch/x86/virt/vmx/tdx/tdx.c     | 2 +-
 arch/x86/virt/vmx/tdx/tdx.h     | 1 +
 3 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/arch/x86/virt/vmx/tdx/seamldr.c b/arch/x86/virt/vmx/tdx/seamldr.c
index 1bb4ae5ccb0a..75bb650d8a16 100644
--- a/arch/x86/virt/vmx/tdx/seamldr.c
+++ b/arch/x86/virt/vmx/tdx/seamldr.c
@@ -235,6 +235,7 @@ enum tdp_state {
 	TDP_START,
 	TDP_SHUTDOWN,
 	TDP_CPU_INSTALL,
+	TDP_CPU_INIT,
 	TDP_DONE,
 };
 
@@ -306,6 +307,9 @@ static int do_seamldr_install_module(void *params)
 				scoped_guard(raw_spinlock, &seamldr_lock)
 					ret = seamldr_call(P_SEAMLDR_INSTALL, &args);
 				break;
+			case TDP_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 26357be18fa9..280c2a9f3211 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)
  *
  * Return 0 on success, otherwise errors.
  */
-static int tdx_cpu_enable(void)
+int tdx_cpu_enable(void)
 {
 	struct tdx_module_args args = {};
 	int ret;
diff --git a/arch/x86/virt/vmx/tdx/tdx.h b/arch/x86/virt/vmx/tdx/tdx.h
index 5b9a2d63808c..b903e479e46a 100644
--- a/arch/x86/virt/vmx/tdx/tdx.h
+++ b/arch/x86/virt/vmx/tdx/tdx.h
@@ -121,5 +121,6 @@ struct tdmr_info_list {
 
 int tdx_module_shutdown(void);
 void tdx_module_set_error(void);
+int tdx_cpu_enable(void);
 
 #endif
-- 
2.47.3