NestedInterruptTplLib provides a way for timer interrupt handlers
(which must support nested interrupts) to prevent unbounded stack
consumption.
The underlying issue was first observed in OvmfPkg, since interrupt
storms can arise more easily in virtual machines due to CPU
starvation. However, careful investigation shows that the unbounded
stack consumption can also occur in physical machines.
Move NestedInterruptTplLib from OvmfPkg to MdeModulePkg so that it can
more easily be consumed by drivers outside of OvmfPkg, adding a
self-test capability and support for Arm CPUs.
Changes since v1:
- Add missing Iret.h to NestedInterruptTplLib sources list
Changes since v2:
- Remove obsolete dependency of LocalApicTimerDxe on OvmfPkg
- Add to MdeModulePkg.dsc for build coverage
- Add self-tests
- Add support for Arm CPUs
Michael Brown (5):
MdeModulePkg: Move NestedInterruptTplLib to MdeModulePkg
MdeModulePkg: Add missing Iret.h to NestedInterruptTplLib sources list
MdeModulePkg: Do nothing on NestedInterruptRestoreTPL(TPL_HIGH_LEVEL)
MdeModulePkg: Add self-tests for NestedInterruptTplLib
MdeModulePkg: Extend NestedInterruptTplLib to support Arm CPUs
MdeModulePkg/MdeModulePkg.dec | 8 +
OvmfPkg/OvmfPkg.dec | 4 -
MdeModulePkg/MdeModulePkg.dsc | 1 +
OvmfPkg/AmdSev/AmdSevX64.dsc | 2 +-
OvmfPkg/CloudHv/CloudHvX64.dsc | 2 +-
OvmfPkg/IntelTdx/IntelTdxX64.dsc | 2 +-
OvmfPkg/Microvm/MicrovmX64.dsc | 2 +-
OvmfPkg/OvmfPkgIa32.dsc | 2 +-
OvmfPkg/OvmfPkgIa32X64.dsc | 2 +-
OvmfPkg/OvmfPkgX64.dsc | 2 +-
OvmfPkg/OvmfXen.dsc | 2 +-
UefiPayloadPkg/UefiPayloadPkg.dsc | 2 +-
.../NestedInterruptTplLib.inf | 9 +-
.../LocalApicTimerDxe/LocalApicTimerDxe.inf | 2 +-
.../Include/Library/NestedInterruptTplLib.h | 4 +
.../Library/NestedInterruptTplLib/Iret.h | 0
.../Library/NestedInterruptTplLib/Iret.c | 18 +++
.../Library/NestedInterruptTplLib/Tpl.c | 142 ++++++++++++++++++
18 files changed, 191 insertions(+), 15 deletions(-)
rename {OvmfPkg =>
MdeModulePkg}/Library/NestedInterruptTplLib/NestedInterruptTplLib.inf (78%)
rename {OvmfPkg => MdeModulePkg}/Include/Library/NestedInterruptTplLib.h (94%)
rename {OvmfPkg => MdeModulePkg}/Library/NestedInterruptTplLib/Iret.h (100%)
rename {OvmfPkg => MdeModulePkg}/Library/NestedInterruptTplLib/Iret.c (72%)
rename {OvmfPkg => MdeModulePkg}/Library/NestedInterruptTplLib/Tpl.c (64%)
--
2.43.0
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