KVM: arm64: Offer early resume for non-blocking WFxT instructions

mainline inclusion
from mainline-v5.19-rc1
commit a3fb5965
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=a3fb59651449d8bd4dc4ed5413888819932c740b



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

For WFxT instructions used with very small delays, it is not
unlikely that the deadline is already expired by the time we
reach the WFx handling code.

Check for this condition as soon as possible, and return to the
guest immediately if we can.

Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20220419182755.601427-7-maz@kernel.org


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