Re: [PATCH v3 18/42] KVM: arm64: Restrict ACCDATA_EL1 undef to FEAT_ST64_ACCDATA being disabled

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To: Marc Zyngier <maz@xxxxxxxxxx>, kvmarm@xxxxxxxxxxxxxxx, kvm@xxxxxxxxxxxxxxx, linux-arm-kernel@xxxxxxxxxxxxxxxxxxx
Subject: Re: [PATCH v3 18/42] KVM: arm64: Restrict ACCDATA_EL1 undef to FEAT_ST64_ACCDATA being disabled
From: Ben Horgan <ben.horgan@xxxxxxx>
Date: Tue, 29 Apr 2025 14:08:07 +0100
Cc: Joey Gouly <joey.gouly@xxxxxxx>, Suzuki K Poulose <suzuki.poulose@xxxxxxx>, Oliver Upton <oliver.upton@xxxxxxxxx>, Zenghui Yu <yuzenghui@xxxxxxxxxx>, Mark Rutland <mark.rutland@xxxxxxx>, Fuad Tabba <tabba@xxxxxxxxxx>, Will Deacon <will@xxxxxxxxxx>, Catalin Marinas <catalin.marinas@xxxxxxx>
In-reply-to: <20250426122836.3341523-19-maz@kernel.org>
References: <20250426122836.3341523-1-maz@kernel.org> <20250426122836.3341523-19-maz@kernel.org>
User-agent: Mozilla Thunderbird

Hi Marc,

On 4/26/25 13:28, Marc Zyngier wrote:

We currently unconditionally make ACCDATA_EL1 accesses UNDEF.

As we are about to support it, restrict the UNDEF behaviour to cases
where FEAT_ST64_ACCDATA is not exposed to the guest.


Isn't the feature called FEAT_LS64_ACCDATA rather than FEAT_ST64_ACCDATA?

Thanks,

Ben

References:
- [PATCH v3 00/42] KVM: arm64: Revamp Fine Grained Trap handling
  - From: Marc Zyngier
- [PATCH v3 18/42] KVM: arm64: Restrict ACCDATA_EL1 undef to FEAT_ST64_ACCDATA being disabled
  - From: Marc Zyngier

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