diff options
| author | Jeff Fan <jeff.fan@intel.com> | 2016-07-15 14:24:28 +0800 |
|---|---|---|
| committer | Michael Kinney <michael.d.kinney@intel.com> | 2016-07-20 18:50:53 -0700 |
| commit | e78a2a49ee6b0c0d7c6997c87ace31d7761cf636 (patch) | |
| tree | 5c14fc5408ec4c29e40657cbd4a92d68cafe4d69 /UefiCpuPkg/PiSmmCpuDxeSmm/MpService.c | |
| parent | 8ff7187cfd998d2b6db43075a4a7908281b6da00 (diff) | |
| download | edk2-e78a2a49ee6b0c0d7c6997c87ace31d7761cf636.tar.gz edk2-e78a2a49ee6b0c0d7c6997c87ace31d7761cf636.tar.bz2 edk2-e78a2a49ee6b0c0d7c6997c87ace31d7761cf636.zip | |
UefiCpuPkg/PiSmmCpuDxeSmm: SMM_CPU_DATA_BLOCK is not cleared
The commit 8b9311 changed the zeroing of mSmmMpSyncData of type
SMM_DISPATCHER_MP_SYNC_DATA by the following patch.
- ZeroMem (mSmmMpSyncData, mSmmMpSyncDataSize);
+ mSmmMpSyncData->SwitchBsp = FALSE;
mSmmMpSyncDataSize not only includes SMM_DISPATCHER_MP_SYNC_DATA, but
also includes the SMM_CPU_DATA_BLOCK array and one BOOLEAN variable
array as shown here:
mSmmMpSyncDataSize = sizeof (SMM_DISPATCHER_MP_SYNC_DATA) +
(sizeof (SMM_CPU_DATA_BLOCK) + sizeof (BOOLEAN)) *
gSmmCpuPrivate->SmmCoreEntryContext.NumberOfCpus;
This patch restores the original ZeroMem() to clear all CPU Sync data.
The commit 8b9311 may cause unexpected behavior.
v2:
Mentioned CandidateBsp array in comments to make it more accurate.
Cc: Laszlo Ersek <lersek@redhat.com>
Cc: Feng Tian <feng.tian@intel.com>
Cc: Michael Kinney <michael.d.kinney@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Jeff Fan <jeff.fan@intel.com>
Reviewed-by: Feng Tian <feng.tian@intel.com>
Reviewed-by: Laszlo Ersek <lersek@redhat.com>
Reviewed-by: Michael Kinney <michael.d.kinney@intel.com>
Diffstat (limited to 'UefiCpuPkg/PiSmmCpuDxeSmm/MpService.c')
| -rw-r--r-- | UefiCpuPkg/PiSmmCpuDxeSmm/MpService.c | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/UefiCpuPkg/PiSmmCpuDxeSmm/MpService.c b/UefiCpuPkg/PiSmmCpuDxeSmm/MpService.c index 5ba0514a35..12466ef5de 100644 --- a/UefiCpuPkg/PiSmmCpuDxeSmm/MpService.c +++ b/UefiCpuPkg/PiSmmCpuDxeSmm/MpService.c @@ -1276,7 +1276,11 @@ InitializeMpSyncData ( UINTN CpuIndex;
if (mSmmMpSyncData != NULL) {
- mSmmMpSyncData->SwitchBsp = FALSE;
+ //
+ // mSmmMpSyncDataSize includes one structure of SMM_DISPATCHER_MP_SYNC_DATA, one
+ // CpuData array of SMM_CPU_DATA_BLOCK and one CandidateBsp array of BOOLEAN.
+ //
+ ZeroMem (mSmmMpSyncData, mSmmMpSyncDataSize);
mSmmMpSyncData->CpuData = (SMM_CPU_DATA_BLOCK *)((UINT8 *)mSmmMpSyncData + sizeof (SMM_DISPATCHER_MP_SYNC_DATA));
mSmmMpSyncData->CandidateBsp = (BOOLEAN *)(mSmmMpSyncData->CpuData + gSmmCpuPrivate->SmmCoreEntryContext.NumberOfCpus);
if (FeaturePcdGet (PcdCpuSmmEnableBspElection)) {
|