On Mon, 3 Jul 2023 17:35:48 +0100, Marc Zyngier wrote:
> Since 0bf50497f03b ("KVM: Drop kvm_count_lock and instead protect
> kvm_usage_count with kvm_lock"), hotplugging back a CPU whilst
> a guest is running results in a number of ugly splats as most
> of this code expects to run with preemption disabled, which isn't
> the case anymore.
>
> While the context is preemptable, it isn't migratable, which should
> be enough. But we have plenty of preemptible() checks all over
> the place, and our per-CPU accessors also disable preemption.
>
> [...]
Applied to kvmarm/fixes, thanks!
[1/1] KVM: arm64: Disable preemption in kvm_arch_hardware_enable()
https://git.kernel.org/kvmarm/kvmarm/c/970dee09b230
--
Best,
Oliver
