Branch: refs/heads/master
Home: https://github.com/tianocore/edk2
Commit: 9c58104ba8732747f0238a178dfe99c6d59b37f7
https://github.com/tianocore/edk2/commit/9c58104ba8732747f0238a178dfe99c6d59b37f7
Author: Ard Biesheuvel <a...@kernel.org>
Date: 2025-05-27 (Tue, 27 May 2025)
Changed paths:
M ArmPlatformPkg/Sec/AArch64/Helper.S
Log Message:
-----------
ArmPlatformPkg/Sec: Deal with entry at EL2 with VHE enabled
The architecture now permits HCR_EL2.E2H to be RES1, and so even though
the UEFI spec is silent on the matter, entering at EL2 with VHE enabled
is a condition that needs to be dealt with. In particular, virtual
machines running under nested virtualization on Apple M2 or newer will
enter in this manner
In this case, the CPTR_EL2 system register needs to be treated as if its
layout is identical to CPACR_EL1. Not doing so may result in all kinds
of surprises, but the most noticeable is an early crash on the use of
FP/SIMD registers, which get disabled inadvertently by this code.
Signed-off-by: Ard Biesheuvel <a...@kernel.org>
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