KVM: arm64: Handle blocking WFIT instruction

mainline inclusion
from mainline-v5.19-rc1
commit 89f5074c
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I6YAMV
CVE: NA

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=89f5074c503b6b6f181c0240c931f67bcaf266e9



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

When trapping a blocking WFIT instruction, take it into account when
computing the deadline of the background timer.

The state is tracked with a new vcpu flag, and is gated by a new
CPU capability, which isn't currently enabled.

Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20220419182755.601427-6-maz@kernel.org


Signed-off-by: Kunkun Jiang <jiangkunkun@huawei.com>