arm64: Advertise mitigation of Spectre-v2, or lack thereof
authorMarc Zyngier <marc.zyngier@arm.com>
Tue, 8 Oct 2019 15:39:25 +0000 (17:39 +0200)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Fri, 11 Oct 2019 16:21:34 +0000 (18:21 +0200)
commitb1a33cfd8034dd45cd90a19bdda0b3293c92401e
tree6d3905a1433a5b21c88f07f14000c8425f87ac82
parent59a6dc262c8500c6e5fb9f234c6078fd72ddc20f
arm64: Advertise mitigation of Spectre-v2, or lack thereof

[ Upstream commit 73f38166095947f3b86b02fbed6bd592223a7ac8 ]

We currently have a list of CPUs affected by Spectre-v2, for which
we check that the firmware implements ARCH_WORKAROUND_1. It turns
out that not all firmwares do implement the required mitigation,
and that we fail to let the user know about it.

Instead, let's slightly revamp our checks, and rely on a whitelist
of cores that are known to be non-vulnerable, and let the user know
the status of the mitigation in the kernel log.

Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Jeremy Linton <jeremy.linton@arm.com>
Reviewed-by: Andre Przywara <andre.przywara@arm.com>
Reviewed-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Tested-by: Stefan Wahren <stefan.wahren@i2se.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
arch/arm64/kernel/cpu_errata.c