From: Marc Zyngier <maz@kernel.org>
To: Ben Horgan <ben.horgan@arm.com>
Cc: kvmarm@lists.linux.dev, kvm@vger.kernel.org,
linux-arm-kernel@lists.infradead.org,
Joey Gouly <joey.gouly@arm.com>,
Suzuki K Poulose <suzuki.poulose@arm.com>,
Oliver Upton <oupton@kernel.org>,
Zenghui Yu <yuzenghui@huawei.com>
Subject: Re: [PATCH 4/5] KVM: arm64: Report optional ID register traps with a 0x18 syndrome
Date: Mon, 24 Nov 2025 11:48:20 +0000 [thread overview]
Message-ID: <86qztnr6rf.wl-maz@kernel.org> (raw)
In-Reply-To: <576d088c-0176-41e5-a66c-8713f5cb09b7@arm.com>
On Mon, 24 Nov 2025 10:41:56 +0000,
Ben Horgan <ben.horgan@arm.com> wrote:
>
> Hi Marc,
>
> On 11/20/25 13:32, Marc Zyngier wrote:
> > With FEAT_IDST, unimplemented system registers must be reported using
> > EC=0x18 at the closest handling EL, rather than with an UNDEF.
>
> I think this needs 'in the feature ID space' adding. Something like:
>
> With FEAT_IDST, unimplemented system registers in the feature ID space
> must be reported using EC=0x18 at the closest handling EL, rather than
> with an UNDEF.
Ah, good point. I got (slightly) carried away!
I'll fold these updates in.
Thanks,
M.
--
Without deviation from the norm, progress is not possible.
next prev parent reply other threads:[~2025-11-24 11:48 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-11-20 13:31 [PATCH 0/5] KVM: arm64: Add support for FEAT_IDST Marc Zyngier
2025-11-20 13:31 ` [PATCH 1/5] KVM: arm64: Add routing/handling for GMID_EL1 Marc Zyngier
2025-11-20 13:31 ` [PATCH 2/5] KVM: arm64: Force trap of GMID_EL1 when the guest doesn't have MTE Marc Zyngier
2025-11-20 14:34 ` Joey Gouly
2025-11-20 14:51 ` Marc Zyngier
2025-11-20 13:32 ` [PATCH 3/5] KVM: arm64: Add a generic synchronous exception injection primitive Marc Zyngier
2025-11-20 13:32 ` [PATCH 4/5] KVM: arm64: Report optional ID register traps with a 0x18 syndrome Marc Zyngier
2025-11-24 10:41 ` Ben Horgan
2025-11-24 11:48 ` Marc Zyngier [this message]
2025-11-20 13:32 ` [PATCH 5/5] KVM: arm64: selftests: Add a test for FEAT_IDST Marc Zyngier
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