[edk2-devel] [PATCH v3 01/10] OvmfPkg/CpuHotplugSmm: refactor hotplug logic
Ankur Arora
ankur.a.arora at oracle.com
Fri Jan 15 07:45:24 UTC 2021
Refactor CpuHotplugMmi() to pull out the CPU hotplug logic into
PlugCpus(). This is in preparation for supporting CPU hot-unplug.
Cc: Laszlo Ersek <lersek at redhat.com>
Cc: Jordan Justen <jordan.l.justen at intel.com>
Cc: Ard Biesheuvel <ard.biesheuvel at arm.com>
Cc: Igor Mammedov <imammedo at redhat.com>
Cc: Boris Ostrovsky <boris.ostrovsky at oracle.com>
Cc: Aaron Young <aaron.young at oracle.com>
Ref: https://bugzilla.tianocore.org/show_bug.cgi?id=3132
Signed-off-by: Ankur Arora <ankur.a.arora at oracle.com>
---
OvmfPkg/CpuHotplugSmm/CpuHotplug.c | 208 ++++++++++++++++++++++---------------
1 file changed, 123 insertions(+), 85 deletions(-)
diff --git a/OvmfPkg/CpuHotplugSmm/CpuHotplug.c b/OvmfPkg/CpuHotplugSmm/CpuHotplug.c
index cfe698ed2b5e..38c71bc11864 100644
--- a/OvmfPkg/CpuHotplugSmm/CpuHotplug.c
+++ b/OvmfPkg/CpuHotplugSmm/CpuHotplug.c
@@ -62,6 +62,124 @@ STATIC UINT32 mPostSmmPenAddress;
//
STATIC EFI_HANDLE mDispatchHandle;
+/**
+ CPU Hotplug handler function.
+
+ @param[in] mPluggedApicIds List of APIC IDs to be plugged.
+
+ @param[in] PluggedCount Count of APIC IDs to be plugged.
+
+ @retval EFI_SUCCESS Some of the requested APIC IDs were hot-plugged.
+
+ @retval EFI_INTERRUPT_PENDING Fatal error while hot-plugging.
+
+**/
+STATIC
+EFI_STATUS
+EFIAPI
+PlugCpus(
+ IN APIC_ID *mPluggedApicIds,
+ IN UINT32 PluggedCount
+ )
+{
+ EFI_STATUS Status;
+ UINT32 PluggedIdx;
+ UINT32 NewSlot;
+
+ //
+ // Process hot-added CPUs.
+ //
+ // The Post-SMM Pen need not be reinstalled multiple times within a single
+ // root MMI handling. Even reinstalling once per root MMI is only prudence;
+ // in theory installing the pen in the driver's entry point function should
+ // suffice.
+ //
+ SmbaseReinstallPostSmmPen (mPostSmmPenAddress);
+
+ PluggedIdx = 0;
+ NewSlot = 0;
+ while (PluggedIdx < PluggedCount) {
+ APIC_ID NewApicId;
+ UINT32 CheckSlot;
+ UINTN NewProcessorNumberByProtocol;
+
+ NewApicId = mPluggedApicIds[PluggedIdx];
+
+ //
+ // Check if the supposedly hot-added CPU is already known to us.
+ //
+ for (CheckSlot = 0;
+ CheckSlot < mCpuHotPlugData->ArrayLength;
+ CheckSlot++) {
+ if (mCpuHotPlugData->ApicId[CheckSlot] == NewApicId) {
+ break;
+ }
+ }
+ if (CheckSlot < mCpuHotPlugData->ArrayLength) {
+ DEBUG ((DEBUG_VERBOSE, "%a: APIC ID " FMT_APIC_ID " was hot-plugged "
+ "before; ignoring it\n", __FUNCTION__, NewApicId));
+ PluggedIdx++;
+ continue;
+ }
+
+ //
+ // Find the first empty slot in CPU_HOT_PLUG_DATA.
+ //
+ while (NewSlot < mCpuHotPlugData->ArrayLength &&
+ mCpuHotPlugData->ApicId[NewSlot] != MAX_UINT64) {
+ NewSlot++;
+ }
+ if (NewSlot == mCpuHotPlugData->ArrayLength) {
+ DEBUG ((DEBUG_ERROR, "%a: no room for APIC ID " FMT_APIC_ID "\n",
+ __FUNCTION__, NewApicId));
+ goto Fatal;
+ }
+
+ //
+ // Store the APIC ID of the new processor to the slot.
+ //
+ mCpuHotPlugData->ApicId[NewSlot] = NewApicId;
+
+ //
+ // Relocate the SMBASE of the new CPU.
+ //
+ Status = SmbaseRelocate (NewApicId, mCpuHotPlugData->SmBase[NewSlot],
+ mPostSmmPenAddress);
+ if (EFI_ERROR (Status)) {
+ goto RevokeNewSlot;
+ }
+
+ //
+ // Add the new CPU with EFI_SMM_CPU_SERVICE_PROTOCOL.
+ //
+ Status = mMmCpuService->AddProcessor (mMmCpuService, NewApicId,
+ &NewProcessorNumberByProtocol);
+ if (EFI_ERROR (Status)) {
+ DEBUG ((DEBUG_ERROR, "%a: AddProcessor(" FMT_APIC_ID "): %r\n",
+ __FUNCTION__, NewApicId, Status));
+ goto RevokeNewSlot;
+ }
+
+ DEBUG ((DEBUG_INFO, "%a: hot-added APIC ID " FMT_APIC_ID ", SMBASE 0x%Lx, "
+ "EFI_SMM_CPU_SERVICE_PROTOCOL assigned number %Lu\n", __FUNCTION__,
+ NewApicId, (UINT64)mCpuHotPlugData->SmBase[NewSlot],
+ (UINT64)NewProcessorNumberByProtocol));
+
+ NewSlot++;
+ PluggedIdx++;
+ }
+
+ //
+ // We've handled this hotplug.
+ //
+ return EFI_SUCCESS;
+
+RevokeNewSlot:
+ mCpuHotPlugData->ApicId[NewSlot] = MAX_UINT64;
+
+Fatal:
+ return EFI_INTERRUPT_PENDING;
+}
/**
CPU Hotplug MMI handler function.
@@ -122,8 +240,6 @@ CpuHotplugMmi (
UINT8 ApmControl;
UINT32 PluggedCount;
UINT32 ToUnplugCount;
- UINT32 PluggedIdx;
- UINT32 NewSlot;
//
// Assert that we are entering this function due to our root MMI handler
@@ -179,87 +295,12 @@ CpuHotplugMmi (
goto Fatal;
}
- //
- // Process hot-added CPUs.
- //
- // The Post-SMM Pen need not be reinstalled multiple times within a single
- // root MMI handling. Even reinstalling once per root MMI is only prudence;
- // in theory installing the pen in the driver's entry point function should
- // suffice.
- //
- SmbaseReinstallPostSmmPen (mPostSmmPenAddress);
+ if (PluggedCount > 0) {
+ Status = PlugCpus(mPluggedApicIds, PluggedCount);
+ }
- PluggedIdx = 0;
- NewSlot = 0;
- while (PluggedIdx < PluggedCount) {
- APIC_ID NewApicId;
- UINT32 CheckSlot;
- UINTN NewProcessorNumberByProtocol;
-
- NewApicId = mPluggedApicIds[PluggedIdx];
-
- //
- // Check if the supposedly hot-added CPU is already known to us.
- //
- for (CheckSlot = 0;
- CheckSlot < mCpuHotPlugData->ArrayLength;
- CheckSlot++) {
- if (mCpuHotPlugData->ApicId[CheckSlot] == NewApicId) {
- break;
- }
- }
- if (CheckSlot < mCpuHotPlugData->ArrayLength) {
- DEBUG ((DEBUG_VERBOSE, "%a: APIC ID " FMT_APIC_ID " was hot-plugged "
- "before; ignoring it\n", __FUNCTION__, NewApicId));
- PluggedIdx++;
- continue;
- }
-
- //
- // Find the first empty slot in CPU_HOT_PLUG_DATA.
- //
- while (NewSlot < mCpuHotPlugData->ArrayLength &&
- mCpuHotPlugData->ApicId[NewSlot] != MAX_UINT64) {
- NewSlot++;
- }
- if (NewSlot == mCpuHotPlugData->ArrayLength) {
- DEBUG ((DEBUG_ERROR, "%a: no room for APIC ID " FMT_APIC_ID "\n",
- __FUNCTION__, NewApicId));
- goto Fatal;
- }
-
- //
- // Store the APIC ID of the new processor to the slot.
- //
- mCpuHotPlugData->ApicId[NewSlot] = NewApicId;
-
- //
- // Relocate the SMBASE of the new CPU.
- //
- Status = SmbaseRelocate (NewApicId, mCpuHotPlugData->SmBase[NewSlot],
- mPostSmmPenAddress);
- if (EFI_ERROR (Status)) {
- goto RevokeNewSlot;
- }
-
- //
- // Add the new CPU with EFI_SMM_CPU_SERVICE_PROTOCOL.
- //
- Status = mMmCpuService->AddProcessor (mMmCpuService, NewApicId,
- &NewProcessorNumberByProtocol);
- if (EFI_ERROR (Status)) {
- DEBUG ((DEBUG_ERROR, "%a: AddProcessor(" FMT_APIC_ID "): %r\n",
- __FUNCTION__, NewApicId, Status));
- goto RevokeNewSlot;
- }
-
- DEBUG ((DEBUG_INFO, "%a: hot-added APIC ID " FMT_APIC_ID ", SMBASE 0x%Lx, "
- "EFI_SMM_CPU_SERVICE_PROTOCOL assigned number %Lu\n", __FUNCTION__,
- NewApicId, (UINT64)mCpuHotPlugData->SmBase[NewSlot],
- (UINT64)NewProcessorNumberByProtocol));
-
- NewSlot++;
- PluggedIdx++;
+ if (EFI_ERROR(Status)) {
+ goto Fatal;
}
//
@@ -267,9 +308,6 @@ CpuHotplugMmi (
//
return EFI_SUCCESS;
-RevokeNewSlot:
- mCpuHotPlugData->ApicId[NewSlot] = MAX_UINT64;
-
Fatal:
ASSERT (FALSE);
CpuDeadLoop ();
--
2.9.3
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