[RFC 10/11] powerpc: kvm: on_primary_thread() force the secondary threads into NAP mode
From: <hidden>
Date: 2014-10-16 07:26:23
Subsystem:
kernel virtual machine for powerpc (kvm/powerpc), linux for powerpc (32-bit and 64-bit), the rest · Maintainers:
Madhavan Srinivasan, Michael Ellerman, Linus Torvalds
The primary hwthread ceases the scheduler of secondary hwthread by bringing them into NAP. Then, the secondary is ready for guest. Signed-off-by: Liu Ping Fan <redacted> --- arch/powerpc/kvm/book3s_hv.c | 7 +++++++ 1 file changed, 7 insertions(+)
diff --git a/arch/powerpc/kvm/book3s_hv.c b/arch/powerpc/kvm/book3s_hv.c
index 4348abd..7896c31 100644
--- a/arch/powerpc/kvm/book3s_hv.c
+++ b/arch/powerpc/kvm/book3s_hv.c@@ -1593,15 +1593,22 @@ static int on_primary_thread(void) { int cpu = smp_processor_id(); int thr; + struct cpumask msk; /* Are we on a primary subcore? */ if (cpu_thread_in_subcore(cpu)) return 0; thr = 0; +#ifdef KVMPPC_ENABLE_SECONDARY + while (++thr < threads_per_subcore) + cpumask_set_cpu(thr, &msk); + stop_cpus_async(&msk, kvmppc_secondary_stopper, NULL); +#else while (++thr < threads_per_subcore) if (cpu_online(cpu + thr)) return 0; +#endif /* Grab all hw threads so they can't go into the kernel */ for (thr = 1; thr < threads_per_subcore; ++thr) {
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1.8.3.1