linux-kernel - [PATCH v9 06/18] x86/virt/tdx: Do TDX module global initialization

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Date:   Tue, 14 Feb 2023 00:59:13 +1300
From:   Kai Huang <kai.huang@...el.com>
To:     linux-kernel@...r.kernel.org, kvm@...r.kernel.org
Cc:     linux-mm@...ck.org, dave.hansen@...el.com, peterz@...radead.org,
        tglx@...utronix.de, seanjc@...gle.com, pbonzini@...hat.com,
        dan.j.williams@...el.com, rafael.j.wysocki@...el.com,
        kirill.shutemov@...ux.intel.com, ying.huang@...el.com,
        reinette.chatre@...el.com, len.brown@...el.com,
        tony.luck@...el.com, ak@...ux.intel.com, isaku.yamahata@...el.com,
        chao.gao@...el.com, sathyanarayanan.kuppuswamy@...ux.intel.com,
        david@...hat.com, bagasdotme@...il.com, sagis@...gle.com,
        imammedo@...hat.com, kai.huang@...el.com
Subject: [PATCH v9 06/18] x86/virt/tdx: Do TDX module global initialization

Start to transit out the "multi-steps" of initializing the TDX module as
listed in the skeleton infrastructure.  Do the first step to do module
global initialization, which is one SEAMCALL on any logical cpu.

Signed-off-by: Kai Huang <kai.huang@...el.com>
Reviewed-by: Isaku Yamahata <isaku.yamahata@...el.com>
---

v8 -> v9:
 - Added this patch back.

---
 arch/x86/virt/vmx/tdx/tdx.c | 11 ++++++++++-
 arch/x86/virt/vmx/tdx/tdx.h | 12 ++++++++++++
 2 files changed, 22 insertions(+), 1 deletion(-)

diff --git a/arch/x86/virt/vmx/tdx/tdx.c b/arch/x86/virt/vmx/tdx/tdx.c
index 5ae3d71b70b4..79cee28c51b5 100644
--- a/arch/x86/virt/vmx/tdx/tdx.c
+++ b/arch/x86/virt/vmx/tdx/tdx.c
@@ -172,10 +172,19 @@ static int __always_unused seamcall(u64 fn, u64 rcx, u64 rdx, u64 r8, u64 r9,
 
 static int init_tdx_module(void)
 {
+	int ret;
+
+	/*
+	 * TDX module global initialization.  All '0's are just
+	 * unused parameters.
+	 */
+	ret = seamcall(TDH_SYS_INIT, 0, 0, 0, 0, NULL, NULL);
+	if (ret)
+		return ret;
+
 	/*
 	 * TODO:
 	 *
-	 *  - TDX module global initialization.
 	 *  - TDX module per-cpu initialization.
 	 *  - Get TDX module information and TDX-capable memory regions.
 	 *  - Build the list of TDX-usable memory regions.
diff --git a/arch/x86/virt/vmx/tdx/tdx.h b/arch/x86/virt/vmx/tdx/tdx.h
index 931a50f0f44c..55472e085bc8 100644
--- a/arch/x86/virt/vmx/tdx/tdx.h
+++ b/arch/x86/virt/vmx/tdx/tdx.h
@@ -4,6 +4,18 @@
 
 #include <linux/types.h>
 
+/*
+ * This file contains both macros and data structures defined by the TDX
+ * architecture and Linux defined software data structures and functions.
+ * The two should not be mixed together for better readability.  The
+ * architectural definitions come first.
+ */
+
+ /*
+  * TDX module SEAMCALL leaf functions
+  */
+#define TDH_SYS_INIT		33
+
 /* Kernel defined TDX module status during module initialization. */
 enum tdx_module_status_t {
 	TDX_MODULE_UNKNOWN,
-- 
2.39.1