diff options
| -rw-r--r-- | UefiCpuPkg/PiSmmCpuDxeSmm/PiSmmCpuDxeSmm.c | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/UefiCpuPkg/PiSmmCpuDxeSmm/PiSmmCpuDxeSmm.c b/UefiCpuPkg/PiSmmCpuDxeSmm/PiSmmCpuDxeSmm.c index c0e368ea94..2144d6ade8 100644 --- a/UefiCpuPkg/PiSmmCpuDxeSmm/PiSmmCpuDxeSmm.c +++ b/UefiCpuPkg/PiSmmCpuDxeSmm/PiSmmCpuDxeSmm.c @@ -1541,6 +1541,19 @@ PerformRemainingTasks ( {
if (mSmmReadyToLock) {
//
+ // Check if all Aps enter SMM. In Relaxed-AP Sync Mode, BSP will not wait for
+ // all Aps arrive. However,PerformRemainingTasks() needs to wait all Aps arrive before calling
+ // SetMemMapAttributes() and ConfigSmmCodeAccessCheck() when mSmmReadyToLock
+ // is true. In SetMemMapAttributes(), SmmSetMemoryAttributesEx() will call
+ // FlushTlbForAll() that need to start up the aps. So it need to let all
+ // aps arrive. Same as SetMemMapAttributes(), ConfigSmmCodeAccessCheck()
+ // also will start up the aps.
+ //
+ if (EFI_ERROR (SmmCpuRendezvous (NULL, TRUE))) {
+ DEBUG ((DEBUG_ERROR, "PerformRemainingTasks: fail to wait for all AP check in SMM!\n"));
+ }
+
+ //
// Start SMM Profile feature
//
if (FeaturePcdGet (PcdCpuSmmProfileEnable)) {
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