@@ -18,6 +18,7 @@
#include <linux/sizes.h>
#include <linux/memblock.h>
#include <linux/gfp.h>
+#include <linux/slab.h>
#include <linux/align.h>
#include <linux/sort.h>
#include <asm/cpufeatures.h>
@@ -932,6 +933,37 @@ static int construct_tdmrs_memeblock(struct tdmr_info *tdmr_array,
return ret;
}
+static int config_tdx_module(struct tdmr_info *tdmr_array, int tdmr_num,
+ u64 global_keyid)
+{
+ u64 *tdmr_pa_array;
+ int i, array_sz;
+ u64 ret;
+
+ /*
+ * TDMR_INFO entries are configured to the TDX module via an
+ * array of the physical address of each TDMR_INFO. TDX module
+ * requires the array itself to be 512-byte aligned. Round up
+ * the array size to 512-byte aligned so the buffer allocated
+ * by kzalloc() will meet the alignment requirement.
+ */
+ array_sz = ALIGN(tdmr_num * sizeof(u64), TDMR_INFO_PA_ARRAY_ALIGNMENT);
+ tdmr_pa_array = kzalloc(array_sz, GFP_KERNEL);
+ if (!tdmr_pa_array)
+ return -ENOMEM;
+
+ for (i = 0; i < tdmr_num; i++)
+ tdmr_pa_array[i] = __pa(tdmr_array_entry(tdmr_array, i));
+
+ ret = seamcall(TDH_SYS_CONFIG, __pa(tdmr_pa_array), tdmr_num,
+ global_keyid, 0, NULL);
+
+ /* Free the array as it is not required any more. */
+ kfree(tdmr_pa_array);
+
+ return ret ? -EFAULT : 0;
+}
+
/*
* Detect and initialize the TDX module.
*
@@ -999,11 +1031,17 @@ static int init_tdx_module(void)
*/
tdx_global_keyid = tdx_keyid_start;
+ /* Pass the TDMRs and the global KeyID to the TDX module */
+ ret = config_tdx_module(tdmr_array, tdmr_num, tdx_global_keyid);
+ if (ret)
+ goto out_free_pamts;
+
/*
* Return -EINVAL until all steps of TDX module initialization
* process are done.
*/
ret = -EINVAL;
+out_free_pamts:
if (ret)
tdmrs_free_pamt_all(tdmr_array, tdmr_num);
else
@@ -53,6 +53,7 @@
#define TDH_SYS_INIT 33
#define TDH_SYS_LP_INIT 35
#define TDH_SYS_LP_SHUTDOWN 44
+#define TDH_SYS_CONFIG 45
struct cmr_info {
u64 base;
@@ -120,6 +121,7 @@ struct tdmr_reserved_area {
} __packed;
#define TDMR_INFO_ALIGNMENT 512
+#define TDMR_INFO_PA_ARRAY_ALIGNMENT 512
struct tdmr_info {
u64 base;
After the TDX-usable memory regions are constructed in an array of TDMRs and the global KeyID is reserved, configure them to the TDX module using TDH.SYS.CONFIG SEAMCALL. TDH.SYS.CONFIG can only be called once and can be done on any logical cpu. Signed-off-by: Kai Huang <kai.huang@intel.com> --- arch/x86/virt/vmx/tdx/tdx.c | 38 +++++++++++++++++++++++++++++++++++++ arch/x86/virt/vmx/tdx/tdx.h | 2 ++ 2 files changed, 40 insertions(+)