From: Marc Zyngier <maz@kernel.org>
To: linux-arm-kernel@lists.infradead.org
Cc: swboyd@google.com,
Sai Prakash Ranjan <saiprakash.ranjan@codeaurora.org>,
kernel-team@android.com,
Suzuki K Poulose <suzuki.poulose@arm.com>,
Catalin Marinas <catalin.marinas@arm.com>,
dianders@google.com, Will Deacon <will@kernel.org>
Subject: [PATCH 0/2] arm64: Allow erratum 1418040 for late CPUs
Date: Tue, 28 Jul 2020 10:21:10 +0100 [thread overview]
Message-ID: <20200728092112.3865765-1-maz@kernel.org> (raw)
Erratum 1418040 currently prevents a late CPU from booting if none
of the early CPUs are affected by it. This is because the handling
is implemented as alternatives, and we have already got rid of them
by the time userspace onlines a new CPU.
A solution to this is to move everything into C code, and rely on
static keys instead. Once this is done, the feature can be allowed
for late CPUs.
Note that CPUs affected by 1418040 also tend to miss AArch32-EL1,
meaning they cannot be used as late CPUs when KVM is enabled and
that their sibblings have AArch32-EL1.
Marc Zyngier (2):
arm64: Move handling of erratum 1418040 into C code
arm64: Allow booting of late CPUs affected by erratum 1418040
arch/arm64/kernel/cpu_errata.c | 2 ++
arch/arm64/kernel/entry.S | 21 ---------------------
arch/arm64/kernel/process.c | 29 +++++++++++++++++++++++++++++
3 files changed, 31 insertions(+), 21 deletions(-)
--
2.27.0
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next reply other threads:[~2020-07-28 9:22 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-07-28 9:21 Marc Zyngier [this message]
2020-07-28 9:21 ` [PATCH 1/2] arm64: Move handling of erratum 1418040 into C code Marc Zyngier
2020-07-28 11:04 ` Sai Prakash Ranjan
2020-07-28 20:04 ` Stephen Boyd
2020-07-29 9:00 ` Marc Zyngier
2020-07-29 17:12 ` Catalin Marinas
2020-07-28 9:21 ` [PATCH 2/2] arm64: Allow booting of late CPUs affected by erratum 1418040 Marc Zyngier
2020-07-28 11:05 ` Sai Prakash Ranjan
2020-07-28 20:04 ` Stephen Boyd
2020-07-29 9:34 ` Suzuki K Poulose
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