Re: [PATCH v4 09/21] arm64: cpufeature: Add global feature override facility

[PATCH v4 00/21] arm64: Early CPU feature override, and applications to VHE, BTI and PAuth · Marc Zyngier <maz@kernel.org> · 2021-01-18
[PATCH v4 01/21] arm64: Fix labels in el2_setup macros · Marc Zyngier <maz@kernel.org> · 2021-01-18
Re: [PATCH v4 01/21] arm64: Fix labels in el2_setup macros · David Brazdil <hidden> · 2021-01-18
[PATCH v4 06/21] arm64: Move VHE-specific SPE setup to mutate_to_vhe() · Marc Zyngier <maz@kernel.org> · 2021-01-18
[PATCH v4 09/21] arm64: cpufeature: Add global feature override facility · Marc Zyngier <maz@kernel.org> · 2021-01-18
Re: [PATCH v4 09/21] arm64: cpufeature: Add global feature override facility · Catalin Marinas <catalin.marinas@arm.com> · 2021-01-22
Re: [PATCH v4 09/21] arm64: cpufeature: Add global feature override facility · Suzuki K Poulose <suzuki.poulose@arm.com> · 2021-01-23
[PATCH v4 05/21] arm64: Initialise as nVHE before switching to VHE · Marc Zyngier <maz@kernel.org> · 2021-01-18
[PATCH v4 08/21] arm64: Move SCTLR_EL1 initialisation to EL-agnostic code · Marc Zyngier <maz@kernel.org> · 2021-01-18
Re: [PATCH v4 08/21] arm64: Move SCTLR_EL1 initialisation to EL-agnostic code · Catalin Marinas <catalin.marinas@arm.com> · 2021-01-20
[PATCH v4 07/21] arm64: Simplify init_el2_state to be non-VHE only · Marc Zyngier <maz@kernel.org> · 2021-01-18
[PATCH v4 03/21] arm64: Turn the MMU-on sequence into a macro · Marc Zyngier <maz@kernel.org> · 2021-01-18
Re: [PATCH v4 03/21] arm64: Turn the MMU-on sequence into a macro · Catalin Marinas <catalin.marinas@arm.com> · 2021-01-20
[PATCH v4 02/21] arm64: Fix outdated TCR setup comment · Marc Zyngier <maz@kernel.org> · 2021-01-18
Re: [PATCH v4 02/21] arm64: Fix outdated TCR setup comment · Catalin Marinas <catalin.marinas@arm.com> · 2021-01-20
[PATCH v4 04/21] arm64: Provide an 'upgrade to VHE' stub hypercall · Marc Zyngier <maz@kernel.org> · 2021-01-18
Re: [PATCH v4 04/21] arm64: Provide an 'upgrade to VHE' stub hypercall · David Brazdil <hidden> · 2021-01-18
Re: [PATCH v4 04/21] arm64: Provide an 'upgrade to VHE' stub hypercall · Marc Zyngier <maz@kernel.org> · 2021-01-24
[PATCH v4 19/21] arm64: cpufeatures: Allow disabling of BTI from the command-line · Marc Zyngier <maz@kernel.org> · 2021-01-18
Re: [PATCH v4 19/21] arm64: cpufeatures: Allow disabling of BTI from the command-line · Catalin Marinas <catalin.marinas@arm.com> · 2021-01-23
Re: [PATCH v4 00/21] arm64: Early CPU feature override, and applications to VHE, BTI and PAuth · David Brazdil <hidden> · 2021-01-18
[PATCH v4 15/21] arm64: Add an aliasing facility for the idreg override · Marc Zyngier <maz@kernel.org> · 2021-01-18
Re: [PATCH v4 15/21] arm64: Add an aliasing facility for the idreg override · David Brazdil <hidden> · 2021-01-18
Re: [PATCH v4 15/21] arm64: Add an aliasing facility for the idreg override · Marc Zyngier <maz@kernel.org> · 2021-01-24
Re: [PATCH v4 15/21] arm64: Add an aliasing facility for the idreg override · Catalin Marinas <catalin.marinas@arm.com> · 2021-01-23
[PATCH v4 11/21] arm64: Extract early FDT mapping from kaslr_early_init() · Marc Zyngier <maz@kernel.org> · 2021-01-18
Re: [PATCH v4 11/21] arm64: Extract early FDT mapping from kaslr_early_init() · Catalin Marinas <catalin.marinas@arm.com> · 2021-01-22
Re: [PATCH v4 11/21] arm64: Extract early FDT mapping from kaslr_early_init() · Catalin Marinas <catalin.marinas@arm.com> · 2021-01-23
[PATCH v4 18/21] arm64: Move "nokaslr" over to the early cpufeature infrastructure · Marc Zyngier <maz@kernel.org> · 2021-01-18
Re: [PATCH v4 18/21] arm64: Move "nokaslr" over to the early cpufeature infrastructure · David Brazdil <hidden> · 2021-01-18
Re: [PATCH v4 18/21] arm64: Move "nokaslr" over to the early cpufeature infrastructure · Marc Zyngier <maz@kernel.org> · 2021-01-24
Re: [PATCH v4 18/21] arm64: Move "nokaslr" over to the early cpufeature infrastructure · Catalin Marinas <catalin.marinas@arm.com> · 2021-01-23
[PATCH v4 10/21] arm64: cpufeature: Use IDreg override in __read_sysreg_by_encoding() · Marc Zyngier <maz@kernel.org> · 2021-01-18
Re: [PATCH v4 10/21] arm64: cpufeature: Use IDreg override in __read_sysreg_by_encoding() · Catalin Marinas <catalin.marinas@arm.com> · 2021-01-22
Re: [PATCH v4 10/21] arm64: cpufeature: Use IDreg override in __read_sysreg_by_encoding() · Suzuki K Poulose <suzuki.poulose@arm.com> · 2021-01-23
[PATCH v4 14/21] arm64: Honor VHE being disabled from the command-line · Marc Zyngier <maz@kernel.org> · 2021-01-18
Re: [PATCH v4 14/21] arm64: Honor VHE being disabled from the command-line · David Brazdil <hidden> · 2021-01-18
Re: [PATCH v4 14/21] arm64: Honor VHE being disabled from the command-line · Catalin Marinas <catalin.marinas@arm.com> · 2021-01-23
Re: [PATCH v4 14/21] arm64: Honor VHE being disabled from the command-line · Marc Zyngier <maz@kernel.org> · 2021-01-24
[PATCH v4 12/21] arm64: cpufeature: Add an early command-line cpufeature override facility · Marc Zyngier <maz@kernel.org> · 2021-01-18
Re: [PATCH v4 12/21] arm64: cpufeature: Add an early command-line cpufeature override facility · David Brazdil <hidden> · 2021-01-18
Re: [PATCH v4 12/21] arm64: cpufeature: Add an early command-line cpufeature override facility · Catalin Marinas <catalin.marinas@arm.com> · 2021-01-23
Re: [PATCH v4 12/21] arm64: cpufeature: Add an early command-line cpufeature override facility · Catalin Marinas <catalin.marinas@arm.com> · 2021-01-23
Re: [PATCH v4 12/21] arm64: cpufeature: Add an early command-line cpufeature override facility · Marc Zyngier <maz@kernel.org> · 2021-01-24
[PATCH v4 17/21] KVM: arm64: Document HVC_VHE_RESTART stub hypercall · Marc Zyngier <maz@kernel.org> · 2021-01-18
Re: [PATCH v4 17/21] KVM: arm64: Document HVC_VHE_RESTART stub hypercall · David Brazdil <hidden> · 2021-01-18
[PATCH v4 21/21] arm64: cpufeatures: Allow disabling of Pointer Auth from the command-line · Marc Zyngier <maz@kernel.org> · 2021-01-18
Re: [PATCH v4 21/21] arm64: cpufeatures: Allow disabling of Pointer Auth from the command-line · Catalin Marinas <catalin.marinas@arm.com> · 2021-01-23
[PATCH v4 13/21] arm64: Allow ID_AA64MMFR1_EL1.VH to be overridden from the command line · Marc Zyngier <maz@kernel.org> · 2021-01-18
Re: [PATCH v4 13/21] arm64: Allow ID_AA64MMFR1_EL1.VH to be overridden from the command line · Catalin Marinas <catalin.marinas@arm.com> · 2021-01-23
[PATCH v4 20/21] arm64: Defer enabling pointer authentication on boot core · Marc Zyngier <maz@kernel.org> · 2021-01-18
Re: [PATCH v4 20/21] arm64: Defer enabling pointer authentication on boot core · Catalin Marinas <catalin.marinas@arm.com> · 2021-01-23
[PATCH v4 16/21] arm64: Make kvm-arm.mode={nvhe,protected} an alias of id_aa64mmfr1.vh=0 · Marc Zyngier <maz@kernel.org> · 2021-01-18
Re: [PATCH v4 16/21] arm64: Make kvm-arm.mode={nvhe,protected} an alias of id_aa64mmfr1.vh=0 · Catalin Marinas <catalin.marinas@arm.com> · 2021-01-23

From: Suzuki K Poulose <suzuki.poulose@arm.com>
Date: 2021-01-23 16:01:21
Also in: kvmarm, lkml

On 1/18/21 9:45 AM, Marc Zyngier wrote:

Add a facility to globally override a feature, no matter what
the HW says. Yes, this sounds dangerous, but we do respect the
"safe" value for a given feature. This doesn't mean the user
doesn't need to know what they are doing.

Nothing uses this yet, so we are pretty safe. For now.

Signed-off-by: Marc Zyngier <maz@kernel.org>

Reviewed-by: Suzuki K Poulose <suzuki.poulose@arm.com>

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