linux-kernel - Re: [PATCH v2] KVM: arm64: Fix circular locking dependency

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Date: Tue, 30 Jan 2024 21:40:43 +0000
From: Marc Zyngier <maz@...nel.org>
To: Suzuki K Poulose <suzuki.poulose@....com>,
	Oliver Upton <oliver.upton@...ux.dev>,
	Sebastian Ene <sebastianene@...gle.com>,
	Catalin Marinas <catalin.marinas@....com>,
	Zenghui Yu <yuzenghui@...wei.com>,
	Will Deacon <will@...nel.org>,
	James Morse <james.morse@....com>
Cc: kvmarm@...ts.linux.dev,
	kernel-team@...roid.com,
	linux-kernel@...r.kernel.org,
	stable@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v2] KVM: arm64: Fix circular locking dependency

On Wed, 24 Jan 2024 09:10:28 +0000, Sebastian Ene wrote:
> The rule inside kvm enforces that the vcpu->mutex is taken *inside*
> kvm->lock. The rule is violated by the pkvm_create_hyp_vm() which acquires
> the kvm->lock while already holding the vcpu->mutex lock from
> kvm_vcpu_ioctl(). Avoid the circular locking dependency altogether by
> protecting the hyp vm handle with the config_lock, much like we already
> do for other forms of VM-scoped data.

Applied to fixes, thanks!

[1/1] KVM: arm64: Fix circular locking dependency
      commit: 10c02aad111df02088d1a81792a709f6a7eca6cc

Cheers,

	M.
-- 
Without deviation from the norm, progress is not possible.