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| author | Marc Zyngier <maz@kernel.org> | 2021-04-08 14:10:09 +0100 |
|---|---|---|
| committer | Catalin Marinas <catalin.marinas@arm.com> | 2021-04-08 18:45:16 +0100 |
| commit | 31a32b49b80f79cbb84a9c948c5609c6fc044443 (patch) | |
| tree | e05bd1f6475ece8044c9d61a1b1a46e00c4c6996 /security | |
| parent | cac642c12a805ae7565a263b59fb94ad19e81952 (diff) | |
| download | linux-31a32b49b80f79cbb84a9c948c5609c6fc044443.tar.gz linux-31a32b49b80f79cbb84a9c948c5609c6fc044443.tar.bz2 linux-31a32b49b80f79cbb84a9c948c5609c6fc044443.zip | |
arm64: Cope with CPUs stuck in VHE mode
It seems that the CPUs part of the SoC known as Apple M1 have the
terrible habit of being stuck with HCR_EL2.E2H==1, in violation
of the architecture.
Try and work around this deplorable state of affairs by detecting
the stuck bit early and short-circuit the nVHE dance. Additional
filtering code ensures that attempts at switching to nVHE from
the command-line are also ignored.
It is still unknown whether there are many more such nuggets
to be found...
Reported-by: Hector Martin <marcan@marcan.st>
Acked-by: Will Deacon <will@kernel.org>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20210408131010.1109027-3-maz@kernel.org
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Diffstat (limited to 'security')
0 files changed, 0 insertions, 0 deletions