diff options
| author | Marc Zyngier <marc.zyngier@arm.com> | 2018-07-20 10:53:06 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-07-22 14:28:51 +0200 |
| commit | c5c89bb4deb8e1f0eed0968f37dfa936f6b5e4c1 (patch) | |
| tree | 554766de7ab78bc07607d8dd171d1d43d7162688 /arch/arm64/kernel/cpu_errata.c | |
| parent | 02e26bd9ad58197533a7d5fcd62f975891a9e936 (diff) | |
arm64: ssbd: Restore mitigation status on CPU resume
commit 647d0519b53f440a55df163de21c52a8205431cc upstream.
On a system where firmware can dynamically change the state of the
mitigation, the CPU will always come up with the mitigation enabled,
including when coming back from suspend.
If the user has requested "no mitigation" via a command line option,
let's enforce it by calling into the firmware again to disable it.
Similarily, for a resume from hibernate, the mitigation could have
been disabled by the boot kernel. Let's ensure that it is set
back on in that case.
Acked-by: Will Deacon <will.deacon@arm.com>
Reviewed-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'arch/arm64/kernel/cpu_errata.c')
| -rw-r--r-- | arch/arm64/kernel/cpu_errata.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/arm64/kernel/cpu_errata.c b/arch/arm64/kernel/cpu_errata.c index 012dab9d9a01..eccdb28b4a39 100644 --- a/arch/arm64/kernel/cpu_errata.c +++ b/arch/arm64/kernel/cpu_errata.c @@ -299,7 +299,7 @@ void __init arm64_enable_wa2_handling(struct alt_instr *alt, *updptr = cpu_to_le32(aarch64_insn_gen_nop()); } -static void arm64_set_ssbd_mitigation(bool state) +void arm64_set_ssbd_mitigation(bool state) { switch (psci_ops.conduit) { case PSCI_CONDUIT_HVC: |