From: Oliver Upton <oliver.upton@linux.dev>
To: Marc Zyngier <maz@kernel.org>
Cc: kvmarm@lists.linux.dev, linux-arm-kernel@lists.infradead.org,
kvm@vger.kernel.org, Joey Gouly <joey.gouly@arm.com>,
Suzuki K Poulose <suzuki.poulose@arm.com>,
Zenghui Yu <yuzenghui@huawei.com>,
Peter Maydell <peter.maydell@linaro.org>,
stable@vger.kernel.org
Subject: Re: [PATCH 1/3] KVM: arm64: Make ID_PFR1_EL1.GIC writable
Date: Wed, 22 Oct 2025 00:00:47 -0700 [thread overview]
Message-ID: <aPiBH1_WZicoE7Od@linux.dev> (raw)
In-Reply-To: <20251013083207.518998-2-maz@kernel.org>
Hey,
On Mon, Oct 13, 2025 at 09:32:05AM +0100, Marc Zyngier wrote:
> Similarly to ID_AA64PFR0_EL1.GIC, relax ID_PFR1_EL1.GIC to be writable.
This looks fine to me, although I do wonder if we should just allow
userspace to write whatever value it wants to the 32-bit ID registers
and be done with it.
Nowhere do we use a 32-bit ID register value as a condition for trap
configuration / emulation, so even if the VMM lies to the guest it
shouldn't trip up KVM.
Thanks,
Oliver
next prev parent reply other threads:[~2025-10-22 7:01 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20251013083207.518998-1-maz@kernel.org>
2025-10-13 8:32 ` [PATCH 1/3] KVM: arm64: Make ID_PFR1_EL1.GIC writable Marc Zyngier
2025-10-22 7:00 ` Oliver Upton [this message]
2025-10-30 11:25 ` Marc Zyngier
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