[PATCH 0/8] KVM: arm64: FPSIMD/SVE/SME fixes · Mark Rutland <mark.rutland@arm.com> · 2025-02-04
[PATCH 1/8] KVM: arm64: Unconditionally save+flush host FPSIMD/SVE/SME state · Mark Rutland <mark.rutland@arm.com> · 2025-02-04
Re: [PATCH 1/8] KVM: arm64: Unconditionally save+flush host FPSIMD/SVE/SME state · Mark Brown <broonie@kernel.org> · 2025-02-04
Re: [PATCH 1/8] KVM: arm64: Unconditionally save+flush host FPSIMD/SVE/SME state · Eric Auger <hidden> · 2025-02-05
[PATCH 2/8] KVM: arm64: Remove host FPSIMD saving for non-protected KVM · Mark Rutland <mark.rutland@arm.com> · 2025-02-04
Re: [PATCH 2/8] KVM: arm64: Remove host FPSIMD saving for non-protected KVM · Mark Brown <broonie@kernel.org> · 2025-02-04
[PATCH 3/8] KVM: arm64: Remove VHE host restore of CPACR_EL1.ZEN · Mark Rutland <mark.rutland@arm.com> · 2025-02-04
Re: [PATCH 3/8] KVM: arm64: Remove VHE host restore of CPACR_EL1.ZEN · Mark Brown <broonie@kernel.org> · 2025-02-04
[PATCH 4/8] KVM: arm64: Remove VHE host restore of CPACR_EL1.SMEN · Mark Rutland <mark.rutland@arm.com> · 2025-02-04
Re: [PATCH 4/8] KVM: arm64: Remove VHE host restore of CPACR_EL1.SMEN · Mark Brown <broonie@kernel.org> · 2025-02-04
[PATCH 5/8] KVM: arm64: Refactor CPTR trap deactivation · Mark Rutland <mark.rutland@arm.com> · 2025-02-04
[PATCH 6/8] KVM: arm64: Refactor exit handlers · Mark Rutland <mark.rutland@arm.com> · 2025-02-04
[PATCH 7/8] KVM: arm64: Mark some header functions as inline · Mark Rutland <mark.rutland@arm.com> · 2025-02-04
Re: [PATCH 7/8] KVM: arm64: Mark some header functions as inline · Mark Brown <broonie@kernel.org> · 2025-02-04
Re: [PATCH 7/8] KVM: arm64: Mark some header functions as inline · Mark Brown <broonie@kernel.org> · 2025-02-05
Re: [PATCH 7/8] KVM: arm64: Mark some header functions as inline · Mark Rutland <mark.rutland@arm.com> · 2025-02-06
Re: [PATCH 7/8] KVM: arm64: Mark some header functions as inline · Mark Rutland <mark.rutland@arm.com> · 2025-02-06
Re: [PATCH 7/8] KVM: arm64: Mark some header functions as inline · Marc Zyngier <maz@kernel.org> · 2025-02-06
Re: [PATCH 7/8] KVM: arm64: Mark some header functions as inline · Mark Rutland <mark.rutland@arm.com> · 2025-02-06
Re: [PATCH 7/8] KVM: arm64: Mark some header functions as inline · Marc Zyngier <maz@kernel.org> · 2025-02-06
Re: [PATCH 7/8] KVM: arm64: Mark some header functions as inline · Mark Rutland <mark.rutland@arm.com> · 2025-02-06
[PATCH 8/8] KVM: arm64: Eagerly switch ZCR_EL{1,2} · Mark Rutland <mark.rutland@arm.com> · 2025-02-04
Re: [PATCH 8/8] KVM: arm64: Eagerly switch ZCR_EL{1,2} · Marc Zyngier <maz@kernel.org> · 2025-02-04
Re: [PATCH 8/8] KVM: arm64: Eagerly switch ZCR_EL{1,2} · Mark Rutland <mark.rutland@arm.com> · 2025-02-06

Re: [PATCH 3/8] KVM: arm64: Remove VHE host restore of CPACR_EL1.ZEN

From: Mark Brown <broonie@kernel.org>
Date: 2025-02-04 17:20:45
Also in: stable

On Tue, Feb 04, 2025 at 03:20:55PM +0000, Mark Rutland wrote:

When KVM is in VHE mode, the host kernel tries to save and restore the
configuration of CPACR_EL1.ZEN (i.e. CPTR_EL2.ZEN when HCR_EL2.E2H=1)
across kvm_arch_vcpu_load_fp() and kvm_arch_vcpu_put_fp(), since the
configuration may be clobbered by hyp when running a vCPU. This logic is
currently redundant.

Reviewed-by: Mark Brown <broonie@kernel.org>

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