linux-kernel - [PATCH v2 07/21] x86/virt/tdx: Do TDX module global initialization

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Date:   Sun, 13 Mar 2022 23:49:47 +1300
From:   Kai Huang <kai.huang@...el.com>
To:     linux-kernel@...r.kernel.org, kvm@...r.kernel.org
Cc:     dave.hansen@...el.com, seanjc@...gle.com, pbonzini@...hat.com,
        kirill.shutemov@...ux.intel.com,
        sathyanarayanan.kuppuswamy@...ux.intel.com, peterz@...radead.org,
        tony.luck@...el.com, ak@...ux.intel.com, dan.j.williams@...el.com,
        isaku.yamahata@...el.com, kai.huang@...el.com
Subject: [PATCH v2 07/21] x86/virt/tdx: Do TDX module global initialization

Do the TDX module global initialization which requires calling
TDH.SYS.INIT once on any logical cpu.

Signed-off-by: Kai Huang <kai.huang@...el.com>
---
 arch/x86/virt/vmx/tdx.c | 11 ++++++++++-
 arch/x86/virt/vmx/tdx.h |  1 +
 2 files changed, 11 insertions(+), 1 deletion(-)

diff --git a/arch/x86/virt/vmx/tdx.c b/arch/x86/virt/vmx/tdx.c
index d87af534db51..45e7404b5d81 100644
--- a/arch/x86/virt/vmx/tdx.c
+++ b/arch/x86/virt/vmx/tdx.c
@@ -463,11 +463,20 @@ static int __tdx_detect(void)
 
 static int init_tdx_module(void)
 {
+	int ret;
+
+	/* TDX module global initialization */
+	ret = seamcall(TDH_SYS_INIT, 0, 0, 0, 0, NULL, NULL);
+	if (ret)
+		goto out;
+
 	/*
 	 * Return -EFAULT until all steps of TDX module
 	 * initialization are done.
 	 */
-	return -EFAULT;
+	ret = -EFAULT;
+out:
+	return ret;
 }
 
 static void shutdown_tdx_module(void)
diff --git a/arch/x86/virt/vmx/tdx.h b/arch/x86/virt/vmx/tdx.h
index dcc1f6dfe378..f0983b1936d8 100644
--- a/arch/x86/virt/vmx/tdx.h
+++ b/arch/x86/virt/vmx/tdx.h
@@ -38,6 +38,7 @@ struct p_seamldr_info {
 /*
  * TDX module SEAMCALL leaf functions
  */
+#define TDH_SYS_INIT		33
 #define TDH_SYS_LP_SHUTDOWN	44
 
 struct tdx_module_output;
-- 
2.35.1