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/openbmc/linux/arch/arm64/kernel/
H A Didreg-override.cdiff 93ad55b7852b324a3fd7d46910b88c81deb62357 Mon Feb 08 03:57:29 CST 2021 Marc Zyngier <maz@kernel.org> arm64: cpufeatures: Allow disabling of BTI from the command-line

In order to be able to disable BTI at runtime, whether it is
for testing purposes, or to work around HW issues, let's add
support for overriding the ID_AA64PFR1_EL1.BTI field.

This is further mapped on the arm64.nobti command-line alias.

Signed-off-by: Marc Zyngier <maz@kernel.org>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Acked-by: David Brazdil <dbrazdil@google.com>
Tested-by: Srinivas Ramana <sramana@codeaurora.org>
Link: https://lore.kernel.org/r/20210208095732.3267263-21-maz@kernel.org
Signed-off-by: Will Deacon <will@kernel.org>
H A Dcpufeature.cdiff 93ad55b7852b324a3fd7d46910b88c81deb62357 Mon Feb 08 03:57:29 CST 2021 Marc Zyngier <maz@kernel.org> arm64: cpufeatures: Allow disabling of BTI from the command-line

In order to be able to disable BTI at runtime, whether it is
for testing purposes, or to work around HW issues, let's add
support for overriding the ID_AA64PFR1_EL1.BTI field.

This is further mapped on the arm64.nobti command-line alias.

Signed-off-by: Marc Zyngier <maz@kernel.org>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Acked-by: David Brazdil <dbrazdil@google.com>
Tested-by: Srinivas Ramana <sramana@codeaurora.org>
Link: https://lore.kernel.org/r/20210208095732.3267263-21-maz@kernel.org
Signed-off-by: Will Deacon <will@kernel.org>
/openbmc/linux/arch/arm64/include/asm/
H A Dcpufeature.hdiff 93ad55b7852b324a3fd7d46910b88c81deb62357 Mon Feb 08 03:57:29 CST 2021 Marc Zyngier <maz@kernel.org> arm64: cpufeatures: Allow disabling of BTI from the command-line

In order to be able to disable BTI at runtime, whether it is
for testing purposes, or to work around HW issues, let's add
support for overriding the ID_AA64PFR1_EL1.BTI field.

This is further mapped on the arm64.nobti command-line alias.

Signed-off-by: Marc Zyngier <maz@kernel.org>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Acked-by: David Brazdil <dbrazdil@google.com>
Tested-by: Srinivas Ramana <sramana@codeaurora.org>
Link: https://lore.kernel.org/r/20210208095732.3267263-21-maz@kernel.org
Signed-off-by: Will Deacon <will@kernel.org>
/openbmc/linux/arch/arm64/mm/
H A Dmmu.cdiff 93ad55b7852b324a3fd7d46910b88c81deb62357 Mon Feb 08 03:57:29 CST 2021 Marc Zyngier <maz@kernel.org> arm64: cpufeatures: Allow disabling of BTI from the command-line

In order to be able to disable BTI at runtime, whether it is
for testing purposes, or to work around HW issues, let's add
support for overriding the ID_AA64PFR1_EL1.BTI field.

This is further mapped on the arm64.nobti command-line alias.

Signed-off-by: Marc Zyngier <maz@kernel.org>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Acked-by: David Brazdil <dbrazdil@google.com>
Tested-by: Srinivas Ramana <sramana@codeaurora.org>
Link: https://lore.kernel.org/r/20210208095732.3267263-21-maz@kernel.org
Signed-off-by: Will Deacon <will@kernel.org>
/openbmc/linux/Documentation/admin-guide/
H A Dkernel-parameters.txtdiff 93ad55b7852b324a3fd7d46910b88c81deb62357 Mon Feb 08 03:57:29 CST 2021 Marc Zyngier <maz@kernel.org> arm64: cpufeatures: Allow disabling of BTI from the command-line

In order to be able to disable BTI at runtime, whether it is
for testing purposes, or to work around HW issues, let's add
support for overriding the ID_AA64PFR1_EL1.BTI field.

This is further mapped on the arm64.nobti command-line alias.

Signed-off-by: Marc Zyngier <maz@kernel.org>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Acked-by: David Brazdil <dbrazdil@google.com>
Tested-by: Srinivas Ramana <sramana@codeaurora.org>
Link: https://lore.kernel.org/r/20210208095732.3267263-21-maz@kernel.org
Signed-off-by: Will Deacon <will@kernel.org>