[PATCH v2 25/31] x86/virt/tdx: Add SEAMCALL wrappers for SPDM management

Xu Yilun
2026-03-27T16:24:06Z

From: Zhenzhong Duan <zhenzhong.duan@intel.com>

Add several SEAMCALL wrappers for SPDM management. TDX Module requires
HPA_ARRAY_T structure as input/output parameters for these SEAMCALLs.
So use tdx_page_array for these wrappers.

- TDH.SPDM.CREATE creates SPDM session metadata buffers for TDX Module.
- TDH.SPDM.DELETE destroys SPDM session metadata and returns these
buffers to host, after checking no reference attached to the metadata.
- TDH.SPDM.CONNECT establishes a new SPDM session with the device.
- TDH.SPDM.DISCONNECT tears down the SPDM session with the device.
- TDH.SPDM.MNG supports three SPDM runtime operations: HEARTBEAT,
KEY_UPDATE and DEV_INFO_RECOLLECTION.

Co-developed-by: Xu Yilun <yilun.xu@linux.intel.com>
Signed-off-by: Xu Yilun <yilun.xu@linux.intel.com>
Signed-off-by: Zhenzhong Duan <zhenzhong.duan@intel.com>
---
arch/x86/include/asm/tdx.h | 13 ++++
arch/x86/virt/vmx/tdx/tdx.h | 5 ++
arch/x86/virt/vmx/tdx/tdx.c | 114 +++++++++++++++++++++++++++++++++++-
3 files changed, 130 insertions(+), 2 deletions(-)

diff --git a/arch/x86/include/asm/tdx.h b/arch/x86/include/asm/tdx.h
index a59e0e43e465..8abdad084972 100644
--- a/arch/x86/include/asm/tdx.h
+++ b/arch/x86/include/asm/tdx.h
@@ -247,6 +247,19 @@ u64 tdh_phymem_page_wbinvd_tdr(struct tdx_td *td);
u64 tdh_phymem_page_wbinvd_hkid(u64 hkid, struct page *page);
u64 tdh_iommu_setup(u64 vtbar, struct tdx_page_array *iommu_mt, u64 *iommu_id);
u64 tdh_iommu_clear(u64 iommu_id, struct tdx_page_array *iommu_mt);
+u64 tdh_spdm_create(u64 func_id, struct tdx_page_array *spdm_mt, u64 *spdm_id);
+u64 tdh_spdm_delete(u64 spdm_id, struct tdx_page_array *spdm_mt,
+ unsigned int *nr_released, u64 *released_hpa);
+u64 tdh_exec_spdm_connect(u64 spdm_id, struct page *spdm_conf,
+ struct page *spdm_rsp, struct page *spdm_req,
+ struct tdx_page_array *spdm_out,
+ u64 *spdm_req_or_out_len);
+u64 tdh_exec_spdm_disconnect(u64 spdm_id, struct page *spdm_rsp,
+ struct page *spdm_req, u64 *spdm_req_len);
+u64 tdh_exec_spdm_mng(u64 spdm_id, u64 spdm_op, struct page *spdm_param,
+ struct page *spdm_rsp, struct page *spdm_req,
+ struct tdx_page_array *spdm_out,
+ u64 *spdm_req_or_out_len);
#else
static inline void tdx_init(void) { }
static inline int tdx_cpu_enable(void) { return -ENODEV; }
diff --git a/arch/x86/virt/vmx/tdx/tdx.h b/arch/x86/virt/vmx/tdx/tdx.h
index b25c418f6e61..4784db2d1d92 100644
--- a/arch/x86/virt/vmx/tdx/tdx.h
+++ b/arch/x86/virt/vmx/tdx/tdx.h
@@ -64,6 +64,11 @@
#define TDH_EXT_MEM_ADD 61
#define TDH_IOMMU_SETUP 128
#define TDH_IOMMU_CLEAR 129
+#define TDH_SPDM_CREATE 130
+#define TDH_SPDM_DELETE 131
+#define TDH_SPDM_CONNECT 142
+#define TDH_SPDM_DISCONNECT 143
+#define TDH_SPDM_MNG 144

/* TDX page types */
#define PT_NDA 0x0
diff --git a/arch/x86/virt/vmx/tdx/tdx.c b/arch/x86/virt/vmx/tdx/tdx.c
index 790713881f1f..02882c2ad177 100644
--- a/arch/x86/virt/vmx/tdx/tdx.c
+++ b/arch/x86/virt/vmx/tdx/tdx.c
@@ -654,7 +654,7 @@ static u64 hpa_list_info_assign_raw(struct tdx_page_array *array)
#define HPA_ARRAY_T_PFN GENMASK_U64(51, 12)
#define HPA_ARRAY_T_SIZE GENMASK_U64(63, 55)

-static u64 __maybe_unused hpa_array_t_assign_raw(struct tdx_page_array *array)
+static u64 hpa_array_t_assign_raw(struct tdx_page_array *array)
{
unsigned long pfn;

@@ -667,7 +667,7 @@ static u64 __maybe_unused hpa_array_t_assign_raw(struct tdx_page_array *array)
FIELD_PREP(HPA_ARRAY_T_SIZE, array->nents - 1);
}

-static u64 __maybe_unused hpa_array_t_release_raw(struct tdx_page_array *array)
+static u64 hpa_array_t_release_raw(struct tdx_page_array *array)
{
if (array->nents == 1)
return 0;
@@ -2107,6 +2107,15 @@ static u64 __seamcall_ir_resched(sc_func_t sc_func, u64 fn,
#define seamcall_ret_ir_resched(fn, args) \
__seamcall_ir_resched(__seamcall_ret, fn, args)

+/*
+ * seamcall_ret_ir_exec() aliases seamcall_ret_ir_resched() for
+ * documentation purposes. It documents the TDX Module extension
+ * seamcalls that are long running / hard-irq preemptible flows that
+ * generate events. The calls using seamcall_ret_ir_resched() are long
+ * running flows, that periodically yield.
+ */
+#define seamcall_ret_ir_exec seamcall_ret_ir_resched
+
noinstr u64 tdh_vp_enter(struct tdx_vp *td, struct tdx_module_args *args)
{
args->rcx = td->tdvpr_pa;
@@ -2506,3 +2515,104 @@ u64 tdh_iommu_clear(u64 iommu_id, struct tdx_page_array *iommu_mt)
return seamcall_ret_ir_resched(TDH_IOMMU_CLEAR, &args);
}
EXPORT_SYMBOL_FOR_MODULES(tdh_iommu_clear, "tdx-host");
+
+u64 tdh_spdm_create(u64 func_id, struct tdx_page_array *spdm_mt, u64 *spdm_id)
+{
+ struct tdx_module_args args = {
+ .rcx = func_id,
+ .rdx = hpa_array_t_assign_raw(spdm_mt)
+ };
+ u64 r;
+
+ tdx_clflush_page_array(spdm_mt);
+
+ r = seamcall_ret(TDH_SPDM_CREATE, &args);
+
+ *spdm_id = args.rcx;
+
+ return r;
+}
+EXPORT_SYMBOL_FOR_MODULES(tdh_spdm_create, "tdx-host");
+
+u64 tdh_spdm_delete(u64 spdm_id, struct tdx_page_array *spdm_mt,
+ unsigned int *nr_released, u64 *released_hpa)
+{
+ struct tdx_module_args args = {
+ .rcx = spdm_id,
+ .rdx = hpa_array_t_release_raw(spdm_mt),
+ };
+ u64 r;
+
+ r = seamcall_ret(TDH_SPDM_DELETE, &args);
+ if (r != TDX_SUCCESS)
+ return r;
+
+ *nr_released = FIELD_GET(HPA_ARRAY_T_SIZE, args.rcx) + 1;
+ *released_hpa = FIELD_GET(HPA_ARRAY_T_PFN, args.rcx) << PAGE_SHIFT;
+
+ return r;
+}
+EXPORT_SYMBOL_FOR_MODULES(tdh_spdm_delete, "tdx-host");
+
+u64 tdh_exec_spdm_connect(u64 spdm_id, struct page *spdm_conf,
+ struct page *spdm_rsp, struct page *spdm_req,
+ struct tdx_page_array *spdm_out,
+ u64 *spdm_req_or_out_len)
+{
+ struct tdx_module_args args = {
+ .rcx = spdm_id,
+ .rdx = page_to_phys(spdm_conf),
+ .r8 = page_to_phys(spdm_rsp),
+ .r9 = page_to_phys(spdm_req),
+ .r10 = hpa_array_t_assign_raw(spdm_out),
+ };
+ u64 r;
+
+ r = seamcall_ret_ir_exec(TDH_SPDM_CONNECT, &args);
+
+ *spdm_req_or_out_len = args.rcx;
+
+ return r;
+}
+EXPORT_SYMBOL_FOR_MODULES(tdh_exec_spdm_connect, "tdx-host");
+
+u64 tdh_exec_spdm_disconnect(u64 spdm_id, struct page *spdm_rsp,
+ struct page *spdm_req, u64 *spdm_req_len)
+{
+ struct tdx_module_args args = {
+ .rcx = spdm_id,
+ .rdx = page_to_phys(spdm_rsp),
+ .r8 = page_to_phys(spdm_req),
+ };
+ u64 r;
+
+ r = seamcall_ret_ir_exec(TDH_SPDM_DISCONNECT, &args);
+
+ *spdm_req_len = args.rcx;
+
+ return r;
+}
+EXPORT_SYMBOL_FOR_MODULES(tdh_exec_spdm_disconnect, "tdx-host");
+
+u64 tdh_exec_spdm_mng(u64 spdm_id, u64 spdm_op, struct page *spdm_param,
+ struct page *spdm_rsp, struct page *spdm_req,
+ struct tdx_page_array *spdm_out,
+ u64 *spdm_req_or_out_len)
+{
+ struct tdx_module_args args = {
+ .rcx = spdm_id,
+ .rdx = spdm_op,
+ .r8 = spdm_param ? page_to_phys(spdm_param) : -1,
+ .r9 = page_to_phys(spdm_rsp),
+ .r10 = page_to_phys(spdm_req),
+ .r11 = spdm_out ? hpa_array_t_assign_raw(spdm_out) : -1,
+ };
+ u64 r;
+
+ r = seamcall_ret_ir_exec(TDH_SPDM_MNG, &args);
+
+ *spdm_req_or_out_len = args.rcx;
+
+ return r;
+}
+EXPORT_SYMBOL_FOR_MODULES(tdh_exec_spdm_mng, "tdx-host");
--
2.25.1