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From: Oliver Upton <oupton@kernel.org>
To: Marc Zyngier <maz@kernel.org>,
	Fuad Tabba <fuad.tabba@linux.dev>
Cc: Oliver Upton <oupton@kernel.org>,
	Joey Gouly <joey.gouly@arm.com>,
	Steffen Eiden <seiden@linux.ibm.com>,
	Suzuki K Poulose <suzuki.poulose@arm.com>,
	Zenghui Yu <yuzenghui@huawei.com>,
	Catalin Marinas <catalin.marinas@arm.com>,
	Will Deacon <will@kernel.org>,
	Mark Rutland <mark.rutland@arm.com>,
	linux-arm-kernel@lists.infradead.org,
	kvmarm@lists.linux.dev,
	linux-kernel@vger.kernel.org
Subject: Re: [PATCH] KVM: arm64: Don't WARN on an unknown VM ioctl in protected mode
Date: Tue, 15 Sep 2026 15:25:35 -0700
Message-ID: <178951103692.10790.7627884400333495166.b4-ty@kernel.org>
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On Mon, 14 Sep 2026 10:38:38 +0100, Fuad Tabba wrote:
> kvm_pkvm_ioctl_allowed() WARNs when kvm_get_cap_for_kvm_ioctl() doesn't
> find the ioctl number in vm_ioctl_caps[], and kvm_arch_vm_ioctl() calls
> it for every number the generic code doesn't handle, so
> ioctl(vm_fd, 0xdeadbeef) from userspace taints a pKVM host and panics it
> under panic_on_warn. The lookup is fed userspace input: return false,
> and userspace gets the -EINVAL kvm_arch_vm_ioctl() returns for that
> number on a host without pKVM.
> 
> [...]

Applied to fixes, thanks!

[1/1] KVM: arm64: Don't WARN on an unknown VM ioctl in protected mode
      https://git.kernel.org/kvmarm/kvmarm/c/49d9d295d69d

--
Best,
Oliver