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由 Nicholas Piggin 提交于
POWER9 CPUs have independent MMU contexts per thread, so KVM does not need to quiesce secondary threads, so the hwthread_req/hwthread_state protocol does not have to be used. So patch it away on POWER9, and patch away the branch from the Linux idle wakeup to kvm_start_guest that is never used. Add a warning and error out of kvmppc_grab_hwthread in case it is ever called on POWER9. This avoids a hwsync in the idle wakeup path on POWER9. Signed-off-by: NNicholas Piggin <npiggin@gmail.com> Acked-by: NPaul Mackerras <paulus@ozlabs.org> [mpe: Use WARN(...) instead of WARN_ON()/pr_err(...)] Signed-off-by: NMichael Ellerman <mpe@ellerman.id.au>
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