[PATCH 0/4] KVM: arm/arm64: Fix locking issues

[Christoffer Dall]

On Fri, May 11, 2018 at 03:20:11PM +0100, Andre Przywara wrote:
> Jan recently reported lockdep complaints regarding various locks in our
> VGIC emulation [1][2].
> This boiled down to two separate issues:
> - When promoting the vgic_irq->irq_lock to require IRQs being disabled,
>   we forgot to amend some instances of this lock on the way. Also this
>   needs to be applied to dependent locks as well. The first two patches
>   fix that. The patch split is designed to simplify backporting.
>   Those patches have been posted before, I am resending them as part
>   of this series.
> - Calling kvm_read_guest() requires us to be inside an SRCU critical
>   section. On some architectures we are always in it when handling VCPU
>   exits, but on ARM we need to lock it individually. Patches 3 and 4
>   fix that, the split is again made to ease backporting.
>   Each of the hunks fix an indiviual commit, but I refrained from
>   splitting this down into eight patches just to put proper Fixes: tags
>   on it. Eventually those commits are part of one out of two series, I put
>   the respective kernel release version as a tag to the Cc: stable line.
> 
> I couldn't reproduce the full lockdep splat on my setup, but at least
> could show one instance and prove that these patches fixes that.
> 
> 
For the series:

Acked-by: Christoffer Dall <christoffer.dall at arm.com>


Thanks for fixing this,
-Christoffer