[PATCH v9 16/23] x86/virt/seamldr: Install a new TDX module

[Chao Gao <chao.gao@intel.com>]

Following the shutdown of the existing TDX module, the update process
continues with installing the new module. P-SEAMLDR provides the
SEAMLDR.INSTALL SEAMCALL to perform this installation, which must be
executed on all CPUs.

Implement SEAMLDR.INSTALL and execute it on every CPU.

Signed-off-by: Chao Gao <chao.gao@intel.com>
Reviewed-by: Tony Lindgren <tony.lindgren@linux.intel.com>
Reviewed-by: Kai Huang <kai.huang@intel.com>
Reviewed-by: Xu Yilun <yilun.xu@linux.intel.com>
Reviewed-by: Kiryl Shutsemau (Meta) <kas@kernel.org>
Reviewed-by: Rick Edgecombe <rick.p.edgecombe@intel.com>
---
v9:
 - Add a comment above seamldr_install()
---
 arch/x86/virt/vmx/tdx/seamldr.c | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/arch/x86/virt/vmx/tdx/seamldr.c b/arch/x86/virt/vmx/tdx/seamldr.c
index 6114cab46196..9d0e7e8c6c20 100644
--- a/arch/x86/virt/vmx/tdx/seamldr.c
+++ b/arch/x86/virt/vmx/tdx/seamldr.c
@@ -19,6 +19,7 @@
 
 /* P-SEAMLDR SEAMCALL leaf function */
 #define P_SEAMLDR_INFO			0x8000000000000000
+#define P_SEAMLDR_INSTALL		0x8000000000000001
 
 #define SEAMLDR_MAX_NR_MODULE_PAGES	496
 #define SEAMLDR_MAX_NR_SIG_PAGES	1
@@ -74,6 +75,15 @@ int seamldr_get_info(struct seamldr_info *seamldr_info)
 }
 EXPORT_SYMBOL_FOR_MODULES(seamldr_get_info, "tdx-host");
 
+/* Call into P-SEAMLDR to install a TDX module update */
+static int seamldr_install(const struct seamldr_params *params)
+{
+	struct tdx_module_args args = {};
+
+	args.rcx = __pa(params);
+	return seamldr_call(P_SEAMLDR_INSTALL, &args);
+}
+
 #define TDX_IMAGE_VERSION_2		0x200
 
 struct tdx_image_header {
@@ -166,6 +176,7 @@ static int init_seamldr_params(struct seamldr_params *params, const u8 *data, u3
 enum module_update_state {
 	MODULE_UPDATE_START,
 	MODULE_UPDATE_SHUTDOWN,
+	MODULE_UPDATE_CPU_INSTALL,
 	MODULE_UPDATE_DONE,
 };
 
@@ -240,6 +251,9 @@ static int do_seamldr_install_module(void *seamldr_params)
 			if (primary)
 				ret = tdx_module_shutdown();
 			break;
+		case MODULE_UPDATE_CPU_INSTALL:
+			ret = seamldr_install(seamldr_params);
+			break;
 		default:
 			break;
 		}
-- 
2.52.0