selftests: KVM: Use KVM_SET_MP_STATE to power off vCPU in psci_test
Setting a vCPU's MP state to KVM_MP_STATE_STOPPED has the effect of powering off the vCPU. Rather than using the vCPU init feature flag, use the KVM_SET_MP_STATE ioctl to power off the target vCPU. Signed-off-by: Oliver Upton <oupton@google.com> Signed-off-by: Marc Zyngier <maz@kernel.org> Link: https://lore.kernel.org/r/20220504032446.4133305-11-oupton@google.com
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