tree ed61763eab29cae380b20c4d304dbb067840da7a
parent ab483cfc0b27ec2217c38aaeb086411067d1c695
author Marc Zyngier <marc.zyngier@arm.com> 1527595874 +0100
committer Marc Zyngier <marc.zyngier@arm.com> 1532079285 +0100

arm64: ssbd: Add prctl interface for per-thread mitigation

commit 9cdc0108baa8ef87c76ed834619886a46bd70cbe upstream.

If running on a system that performs dynamic SSBD mitigation, allow
userspace to request the mitigation for itself. This is implemented
as a prctl call, allowing the mitigation to be enabled or disabled at
will for this particular thread.

Acked-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>