[PATCH 0/3] KVM: arm64: Fix teardown of non-protected VMs with pKVM

[Mark Brown]

On Tue, Mar 31, 2026 at 04:50:52PM +0100, Will Deacon wrote:

> This time, it spotted that my fix (introduced in v5 [1] of the pKVM
> series) to prevent taking a reference on a VM in the 'is_dying' state
> also prevents unsharing of pages shared with a non-protected VM if that
> VM is torn down by its VM fd being destroyed, rather than the usual path
> via the MMU notifiers.

> Rather than send a v6 of the whole series, here are three patches that
> apply on top of v5 and fix the issue by (a) preventing teardown of a
> referenced VM and (b) allowing some references to be taken on a dying
> VM. As an added bonus, this simplifies the locking on the reclaim path
> because now a VM reference is enough to stop the page-tables from going
> away.

This series fixes the warnings I reported with pKVM on N1DSP yesterday:

Tested-by: Mark Brown <broonie at kernel.org>
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