diff mbox series

[v3,15/21] x86/virt/tdx: Reserve TDX module global KeyID

Message ID 3e4929500a7b5bbaaf8ed23cde088172862acae0.1649219184.git.kai.huang@intel.com (mailing list archive)
State New, archived
Headers show
Series TDX host kernel support | expand

Commit Message

Huang, Kai April 6, 2022, 4:49 a.m. UTC 
TDX module initialization requires to use one TDX private KeyID as the
global KeyID to crypto protect TDX metadata.  The global KeyID is
configured to the TDX module along with TDMRs.

Just reserve the first TDX private KeyID as the global KeyID.

Signed-off-by: Kai Huang <kai.huang@intel.com>
---
 arch/x86/virt/vmx/tdx/tdx.c | 9 +++++++++
 1 file changed, 9 insertions(+)
diff mbox series

Patch

diff --git a/arch/x86/virt/vmx/tdx/tdx.c b/arch/x86/virt/vmx/tdx/tdx.c
index bf0d13644898..ecd65f7014e2 100644
--- a/arch/x86/virt/vmx/tdx/tdx.c
+++ b/arch/x86/virt/vmx/tdx/tdx.c
@@ -112,6 +112,9 @@  static struct cmr_info tdx_cmr_array[MAX_CMRS] __aligned(CMR_INFO_ARRAY_ALIGNMEN
 static int tdx_cmr_num;
 static struct tdsysinfo_struct tdx_sysinfo;
 
+/* TDX global KeyID to protect TDX metadata */
+static u32 tdx_global_keyid;
+
 static bool __seamrr_enabled(void)
 {
 	return (seamrr_mask & SEAMRR_ENABLED_BITS) == SEAMRR_ENABLED_BITS;
@@ -1320,6 +1323,12 @@  static int init_tdx_module(void)
 	if (ret)
 		goto out_free_tdmrs;
 
+	/*
+	 * Reserve the first TDX KeyID as global KeyID to protect
+	 * TDX module metadata.
+	 */
+	tdx_global_keyid = tdx_keyid_start;
+
 	/*
 	 * Return -EFAULT until all steps of TDX module
 	 * initialization are done.