[PATCH v2 05/17] x86/virt/tdx: Make TDX module initialize the extensions

[Xu Yilun]

After providing all required memory to TDX module, initialize TDX
module extensions via TDH.EXT.INIT, so extension SEAMCALLs can be used.

Signed-off-by: Xu Yilun <yilun.xu@xxxxxxxxxxxxxxx>
Reviewed-by: Xiaoyao Li <xiaoyao.li@xxxxxxxxx>
Reviewed-by: Tony Lindgren <tony.lindgren@xxxxxxxxxxxxxxx>
Reviewed-by: Adrian Hunter <adrian.hunter@xxxxxxxxx>
---
 arch/x86/virt/vmx/tdx/tdx.h |  1 +
 arch/x86/virt/vmx/tdx/tdx.c | 22 +++++++++++++++++++++-
 2 files changed, 22 insertions(+), 1 deletion(-)

diff --git a/arch/x86/virt/vmx/tdx/tdx.h b/arch/x86/virt/vmx/tdx/tdx.h
index a100634087e7..2deb0a5c902e 100644
--- a/arch/x86/virt/vmx/tdx/tdx.h
+++ b/arch/x86/virt/vmx/tdx/tdx.h
@@ -63,6 +63,7 @@
 #define TDH_SYS_SHUTDOWN		52
 #define TDH_SYS_UPDATE_V0		53
 #define TDH_SYS_UPDATE			SEAMCALL_LEAF_VER(TDH_SYS_UPDATE_V0, 1)
+#define TDH_EXT_INIT			60
 #define TDH_EXT_MEM_ADD			61
 #define TDH_SYS_DISABLE			69
 
diff --git a/arch/x86/virt/vmx/tdx/tdx.c b/arch/x86/virt/vmx/tdx/tdx.c
index dab17822c1c6..900928de373a 100644
--- a/arch/x86/virt/vmx/tdx/tdx.c
+++ b/arch/x86/virt/vmx/tdx/tdx.c
@@ -1167,6 +1167,22 @@ static __init int init_tdmrs(struct tdmr_info_list *tdmr_list)
 	return 0;
 }
 
+/* Initialize TDX module extensions for extension SEAMCALLs */
+static __init int tdx_ext_init(void)
+{
+	struct tdx_module_args args = {};
+	u64 r;
+
+	do {
+		r = seamcall(TDH_EXT_INIT, &args);
+	} while (r == TDX_INTERRUPTED_RESUMABLE);
+
+	if (r != TDX_SUCCESS)
+		return -EFAULT;
+
+	return 0;
+}
+
 #define HPA_LIST_INFO_FIRST_ENTRY	GENMASK_U64(11, 3)
 #define HPA_LIST_INFO_PFN		GENMASK_U64(51, 12)
 #define HPA_LIST_INFO_LAST_ENTRY	GENMASK_U64(63, 55)
@@ -1285,7 +1301,11 @@ static __init int init_tdx_module_extensions(void)
 	if (!sysinfo_ext.ext_required)
 		return 0;
 
-	return tdx_ext_mem_setup(sysinfo_ext.memory_pool_required_pages);
+	ret = tdx_ext_mem_setup(sysinfo_ext.memory_pool_required_pages);
+	if (ret)
+		return ret;
+
+	return tdx_ext_init();
 }
 
 static __init int init_tdx_module(void)
-- 
2.25.1