Re: [PATCH v3 7/9] arm/arm64: kvm: pmu: Make overflow handler NMI safe

[Zenghui Yu <yuzenghui@xxxxxxxxxx>]

Hi Julien,

On 2019/7/8 22:32, Julien Thierry wrote:
> When using an NMI for the PMU interrupt, taking any lock migh cause a
                                                           ^^^^
s/migh/might/

> deadlock. The current PMU overflow handler in KVM takes takes locks when
                                                    ^^^^^ ^^^^^
                                                    two "takes" ?


Thanks,
zenghui

> trying to wake up a vcpu.
>
> When overflow handler is called by an NMI, defer the vcpu waking in an
> irq_work queue.

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