arm64: kexec: always reset to EL2 if present
authorMark Rutland <mark.rutland@arm.com>
Mon, 2 Jul 2018 13:17:53 +0000 (14:17 +0100)
committerWill Deacon <will.deacon@arm.com>
Wed, 4 Jul 2018 17:34:24 +0000 (18:34 +0100)
commit76f4e2da45b44bf70f61c28fcbc91668492463e0
treeb6bc57929f74dfa86e552f92d1e614b09c33f69c
parent7e7df71fd57ff2894d96abb0080922bf39460a79
arm64: kexec: always reset to EL2 if present

Currently machine_kexec() doesn't reset to EL2 in the case of a
crashdump kernel. This leaves potentially dodgy state active at EL2, and
means that if the crashdump kernel attempts to online secondary CPUs,
these will be booted as mismatched ELs.

Let's reset to EL2, as we do in all other cases, and simplify things. If
EL2 state is corrupt, things are already sufficiently bad that kdump is
unlikely to work, and it's best-effort regardless.

Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: James Morse <james.morse@arm.com>
Acked-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
arch/arm64/kernel/cpu-reset.h
arch/arm64/kernel/machine_kexec.c