Michael,
Can you check my mail https://edk2.groups.io/g/devel/message/114369?
I proposed another solution to fix the infinite nested interrupt issue which
I think is simpler.
Thanks,
Ray
> -----Original Message-----
> From: devel@edk2.groups.io <devel@edk2.groups.io> On Behalf Of Michael
> Brown
> Sent: Tuesday, January 23, 2024 11:31 PM
> To: devel@edk2.groups.io
> Cc: Ni, Ray <ray.ni@intel.com>; Gerd Hoffmann <kraxel@redhat.com>; Laszlo
> Ersek <lersek@redhat.com>; Michael Brown <mcb30@ipxe.org>
> Subject: [edk2-devel] [PATCH v3 0/5] MdeModulePkg: Move
> NestedInterruptTplLib to MdeModulePkg
>
> 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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