Re: [PATCH v5 05/21] arm64: Initialise as nVHE before switching to VHE

[PATCH v5 00/21] arm64: Early CPU feature override, and applications to VHE, BTI and PAuth · Marc Zyngier <maz@kernel.org> · 2021-01-26
[PATCH v5 08/21] arm64: Move SCTLR_EL1 initialisation to EL-agnostic code · Marc Zyngier <maz@kernel.org> · 2021-01-25
[PATCH v5 07/21] arm64: Simplify init_el2_state to be non-VHE only · Marc Zyngier <maz@kernel.org> · 2021-01-25
Re: [PATCH v5 07/21] arm64: Simplify init_el2_state to be non-VHE only · Catalin Marinas <catalin.marinas@arm.com> · 2021-01-25
[PATCH v5 10/21] arm64: cpufeature: Use IDreg override in __read_sysreg_by_encoding() · Marc Zyngier <maz@kernel.org> · 2021-01-25
Re: [PATCH v5 10/21] arm64: cpufeature: Use IDreg override in __read_sysreg_by_encoding() · Catalin Marinas <catalin.marinas@arm.com> · 2021-01-26
[PATCH v5 12/21] arm64: cpufeature: Add an early command-line cpufeature override facility · Marc Zyngier <maz@kernel.org> · 2021-01-25
Re: [PATCH v5 12/21] arm64: cpufeature: Add an early command-line cpufeature override facility · Catalin Marinas <catalin.marinas@arm.com> · 2021-01-25
[PATCH v5 18/21] arm64: Move "nokaslr" over to the early cpufeature infrastructure · Marc Zyngier <maz@kernel.org> · 2021-01-25
Re: [PATCH v5 18/21] arm64: Move "nokaslr" over to the early cpufeature infrastructure · Ard Biesheuvel <ardb@kernel.org> · 2021-01-25
Re: [PATCH v5 18/21] arm64: Move "nokaslr" over to the early cpufeature infrastructure · Marc Zyngier <maz@kernel.org> · 2021-01-26
Re: [PATCH v5 18/21] arm64: Move "nokaslr" over to the early cpufeature infrastructure · Ard Biesheuvel <ardb@kernel.org> · 2021-01-26
Re: [PATCH v5 18/21] arm64: Move "nokaslr" over to the early cpufeature infrastructure · Marc Zyngier <maz@kernel.org> · 2021-01-26
Re: [PATCH v5 18/21] arm64: Move "nokaslr" over to the early cpufeature infrastructure · Ard Biesheuvel <ardb@kernel.org> · 2021-01-25
[PATCH v5 17/21] KVM: arm64: Document HVC_VHE_RESTART stub hypercall · Marc Zyngier <maz@kernel.org> · 2021-01-25
[PATCH v5 21/21] arm64: cpufeatures: Allow disabling of Pointer Auth from the command-line · Marc Zyngier <maz@kernel.org> · 2021-01-25
[PATCH v5 19/21] arm64: cpufeatures: Allow disabling of BTI from the command-line · Marc Zyngier <maz@kernel.org> · 2021-01-25
[PATCH v5 11/21] arm64: Extract early FDT mapping from kaslr_early_init() · Marc Zyngier <maz@kernel.org> · 2021-01-25
[PATCH v5 15/21] arm64: Add an aliasing facility for the idreg override · Marc Zyngier <maz@kernel.org> · 2021-01-25
[PATCH v5 14/21] arm64: Honor VHE being disabled from the command-line · Marc Zyngier <maz@kernel.org> · 2021-01-25
Re: [PATCH v5 14/21] arm64: Honor VHE being disabled from the command-line · Catalin Marinas <catalin.marinas@arm.com> · 2021-01-25
[PATCH v5 20/21] arm64: Defer enabling pointer authentication on boot core · Marc Zyngier <maz@kernel.org> · 2021-01-25
[PATCH v5 13/21] arm64: Allow ID_AA64MMFR1_EL1.VH to be overridden from the command line · Marc Zyngier <maz@kernel.org> · 2021-01-25
Re: [PATCH v5 13/21] arm64: Allow ID_AA64MMFR1_EL1.VH to be overridden from the command line · Suzuki K Poulose <suzuki.poulose@arm.com> · 2021-01-25
Re: [PATCH v5 13/21] arm64: Allow ID_AA64MMFR1_EL1.VH to be overridden from the command line · Marc Zyngier <maz@kernel.org> · 2021-01-25
Re: [PATCH v5 13/21] arm64: Allow ID_AA64MMFR1_EL1.VH to be overridden from the command line · Catalin Marinas <catalin.marinas@arm.com> · 2021-01-26
[PATCH v5 16/21] arm64: Make kvm-arm.mode={nvhe, protected} an alias of id_aa64mmfr1.vh=0 · Marc Zyngier <maz@kernel.org> · 2021-01-25
[PATCH v5 05/21] arm64: Initialise as nVHE before switching to VHE · Marc Zyngier <maz@kernel.org> · 2021-01-26
Re: [PATCH v5 05/21] arm64: Initialise as nVHE before switching to VHE · Catalin Marinas <catalin.marinas@arm.com> · 2021-01-26
[PATCH v5 06/21] arm64: Move VHE-specific SPE setup to mutate_to_vhe() · Marc Zyngier <maz@kernel.org> · 2021-01-26
Re: [PATCH v5 06/21] arm64: Move VHE-specific SPE setup to mutate_to_vhe() · Catalin Marinas <catalin.marinas@arm.com> · 2021-01-26
[PATCH v5 04/21] arm64: Provide an 'upgrade to VHE' stub hypercall · Marc Zyngier <maz@kernel.org> · 2021-01-26
Re: [PATCH v5 04/21] arm64: Provide an 'upgrade to VHE' stub hypercall · Catalin Marinas <catalin.marinas@arm.com> · 2021-01-26
[PATCH v5 01/21] arm64: Fix labels in el2_setup macros · Marc Zyngier <maz@kernel.org> · 2021-01-26
[PATCH v5 02/21] arm64: Fix outdated TCR setup comment · Marc Zyngier <maz@kernel.org> · 2021-01-26
[PATCH v5 03/21] arm64: Turn the MMU-on sequence into a macro · Marc Zyngier <maz@kernel.org> · 2021-01-26
[PATCH v5 09/21] arm64: cpufeature: Add global feature override facility · Marc Zyngier <maz@kernel.org> · 2021-01-26
Re: [PATCH v5 09/21] arm64: cpufeature: Add global feature override facility · Catalin Marinas <catalin.marinas@arm.com> · 2021-01-26

From: Catalin Marinas <catalin.marinas@arm.com>
Date: 2021-01-26 19:22:56
Also in: kvmarm, lkml

On Mon, Jan 25, 2021 at 10:50:03AM +0000, Marc Zyngier wrote:

As we are aiming to be able to control whether we enable VHE or
not, let's always drop down to EL1 first, and only then upgrade
to VHE if at all possible.

This means that if the kernel is booted at EL2, we always start
with a nVHE init, drop to EL1 to initialise the the kernel, and
only then upgrade the kernel EL to EL2 if possible (the process
is obviously shortened for secondary CPUs).

The resume path is handled similarly to a secondary CPU boot.

Signed-off-by: Marc Zyngier <maz@kernel.org>
Acked-by: David Brazdil <redacted>

Acked-by: Catalin Marinas <catalin.marinas@arm.com>

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