On Mon, Nov 19, 2018 at 05:07:55PM +0000, Julien Thierry wrote:
> While testing KVM running on PREEMPT_RT, starting guest could simply
> freeze the machine. This is because we are using spinlocks for VGIC
> locks, which is invalid in the VGIC case since the locks must be take
> with interrupts disabled.
>
> The solution is to use raw_spinlock instead of spinlocks.
>
> Replacing those locks also highlighted an issue where we attempt to
> cond_resched with interrupts disabled.
>
> Patch 1 fixes the cond_resched issue.
I don't agree with this fix without seeing a more thorough analysis.
> Patch 2-4 replace the VGIC spinlocks with raw_spinlocks
>
For these:
Acked-by: Christoffer Dall <christoffer.dall@xxxxxxx>
Thanks,
Christoffer
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