hulk inclusion
category: feature
bugzilla: 12804
CVE: NA

-------------------------------------------------

When using an NMI for the PMU interrupt, taking any lock migh cause a
deadlock. The current PMU overflow handler in KVM takes takes locks when
trying to wake up a vcpu.

When overflow handler is called by an NMI, defer the vcpu waking in an
irq_work queue.
Signed-off-by: NJulien Thierry <julien.thierry@arm.com>
Cc: Christoffer Dall <christoffer.dall@arm.com>
Cc: Marc Zyngier <marc.zyngier@arm.com>
Cc: Will Deacon <will.deacon@arm.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: kvmarm@lists.cs.columbia.edu
Signed-off-by: NWei Li <liwei391@huawei.com>
Signed-off-by: NYang Yingliang <yangyingliang@huawei.com>