Branch: refs/heads/master
Home: https://github.com/tianocore/edk2
Commit: e8668d2dee2f001a053d9e50f431e2f1f8165b8b
https://github.com/tianocore/edk2/commit/e8668d2dee2f001a053d9e50f431e2f1f8165b8b
Author: Ard Biesheuvel <a...@kernel.org>
Date: 2024-12-06 (Fri, 06 Dec 2024)
Changed paths:
M MdeModulePkg/Core/Dxe/DxeMain/DxeMain.c
Log Message:
-----------
MdeModulePkg/DxeCore: Call BeforeExitBootServices event group only once
According to UEFI spec 2.10 errata A section 7.4.6
"All events from the EFI_EVENT_GROUP_BEFORE_EXIT_BOOT_SERVICES and
EFI_EVENT_GROUP_EXIT_BOOT_SERVICES event notification groups as well
as events of type EVT_SIGNAL_EXIT_BOOT_SERVICES must be signaled
before ExitBootServices() returns EFI_SUCCESS. The events are only
signaled once even if ExitBootServices() is called multiple times."
So keep track of whether ExitBootServices() has been called, and signal
the event group EFI_EVENT_GROUP_BEFORE_EXIT_BOOT_SERVICES only the first
time around.
EFI_EVENT_GROUP_EXIT_BOOT_SERVICES will only be signalled if
ExitBootServices() is going to run to [successful] completion, after
which calling it a second time is not possible anyway. So for this case,
no special handling is needed.
Signed-off-by: Ard Biesheuvel <a...@kernel.org>
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