linux-kernel - [PATCH v4 10/22] x86/virt/tdx: Do logical-cpu scope TDX module initialization

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Message-Id: <f87ac9fd402279bd2960d345f12228a8f5be7cd1.1654025431.git.kai.huang@intel.com>
Date:   Wed,  1 Jun 2022 07:39:33 +1200
From:   Kai Huang <kai.huang@...el.com>
To:     linux-kernel@...r.kernel.org, kvm@...r.kernel.org
Cc:     seanjc@...gle.com, pbonzini@...hat.com, dave.hansen@...el.com,
        len.brown@...el.com, tony.luck@...el.com,
        rafael.j.wysocki@...el.com, reinette.chatre@...el.com,
        dan.j.williams@...el.com, peterz@...radead.org, ak@...ux.intel.com,
        kirill.shutemov@...ux.intel.com,
        sathyanarayanan.kuppuswamy@...ux.intel.com,
        isaku.yamahata@...el.com, kai.huang@...el.com
Subject: [PATCH v4 10/22] x86/virt/tdx: Do logical-cpu scope TDX module initialization

After the global module initialization, the next step is logical-cpu
scope module initialization.  Logical-cpu initialization requires
calling TDH.SYS.LP.INIT on all BIOS-enabled CPUs.  This SEAMCALL can run
concurrently on all CPUs.

Use the helper introduced for shutting down the module to do logical-cpu
scope initialization.

Signed-off-by: Kai Huang <kai.huang@...el.com>
---
 arch/x86/virt/vmx/tdx/tdx.c | 15 +++++++++++++++
 arch/x86/virt/vmx/tdx/tdx.h |  1 +
 2 files changed, 16 insertions(+)

diff --git a/arch/x86/virt/vmx/tdx/tdx.c b/arch/x86/virt/vmx/tdx/tdx.c
index 37a5f37dc013..081aa7e280d8 100644
--- a/arch/x86/virt/vmx/tdx/tdx.c
+++ b/arch/x86/virt/vmx/tdx/tdx.c
@@ -201,6 +201,15 @@ static int tdx_module_init_global(void)
 	return ret ? -EFAULT : 0;
 }
 
+static int tdx_module_init_cpus(void)
+{
+	struct seamcall_ctx sc = { .fn = TDH_SYS_LP_INIT };
+
+	seamcall_on_each_cpu(&sc);
+
+	return atomic_read(&sc.err);
+}
+
 /*
  * Detect and initialize the TDX module.
  *
@@ -225,6 +234,12 @@ static int init_tdx_module(void)
 	if (ret)
 		goto out;
 
+	/* Logical-cpu scope initialization */
+	ret = tdx_module_init_cpus();
+	if (ret)
+		goto out;
+
+
 	/*
 	 * Return -EINVAL until all steps of TDX module initialization
 	 * process are done.
diff --git a/arch/x86/virt/vmx/tdx/tdx.h b/arch/x86/virt/vmx/tdx/tdx.h
index 9e694789eb91..56164bf27378 100644
--- a/arch/x86/virt/vmx/tdx/tdx.h
+++ b/arch/x86/virt/vmx/tdx/tdx.h
@@ -50,6 +50,7 @@
  * TDX module SEAMCALL leaf functions
  */
 #define TDH_SYS_INIT		33
+#define TDH_SYS_LP_INIT		35
 #define TDH_SYS_LP_SHUTDOWN	44
 
 /*
-- 
2.35.3