[PATCH v6 13/22] x86/virt/seamldr: Install a new TDX module

[Chao Gao]

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@xxxxxxxxx>
Reviewed-by: Tony Lindgren <tony.lindgren@xxxxxxxxxxxxxxx>
Reviewed-by: Kai Huang <kai.huang@xxxxxxxxx>
Reviewed-by: Xu Yilun <yilun.xu@xxxxxxxxxxxxxxx>
---
v6:
 - wrap seamldr_call(P_SEAMLDR_INSTALL..) in a helper [Kiryl]
v5:
 - drop "serially" from the changelog as it doesn't matter to
   this patch
---
 arch/x86/virt/vmx/tdx/seamldr.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/arch/x86/virt/vmx/tdx/seamldr.c b/arch/x86/virt/vmx/tdx/seamldr.c
index a8fd29818378..0c282a7565a1 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_4KB_PAGES	496
 #define SEAMLDR_MAX_NR_SIG_4KB_PAGES	4
@@ -73,6 +74,13 @@ int seamldr_get_info(struct seamldr_info *seamldr_info)
 }
 EXPORT_SYMBOL_FOR_MODULES(seamldr_get_info, "tdx-host");
 
+static int seamldr_install(const struct seamldr_params *params)
+{
+	struct tdx_module_args args = { .rcx = __pa(params) };
+
+	return seamldr_call(P_SEAMLDR_INSTALL, &args);
+}
+
 static void free_seamldr_params(struct seamldr_params *params)
 {
 	free_page((unsigned long)params);
@@ -192,6 +200,7 @@ static struct seamldr_params *init_seamldr_params(const u8 *data, u32 size)
 enum module_update_state {
 	MODULE_UPDATE_START,
 	MODULE_UPDATE_SHUTDOWN,
+	MODULE_UPDATE_CPU_INSTALL,
 	MODULE_UPDATE_DONE,
 };
 
@@ -249,6 +258,9 @@ 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;
 			}
-- 
2.47.3