Profiling the kernel of the outer VM after shutting down the inner VM
shows the system idling though on the host it is consuming multiple
cores.
# echo 1 > /sys/kernel/profiling
# readprofile -m System.map | sort -nr | head -n 10
11296 total 0,0008
9365 default_idle_call 35,4735
252 __sbi_ecall 0,7500
192 __might_resched 0,6316
145 _raw_spin_unlock_irqrestore 2,2656
136 handle_page_fault 0,1164
113 do_trap_ecall_u 0,1273
86 finish_task_switch.isra.0 0,1734
78 do_idle 0,1266
73 mod_memcg_lruvec_state 0,1201
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https://bugs.launchpad.net/bugs/2112578
Title:
riscv64: KVM does not release harts
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