KVM: PPC: Book3S HV: Increase timeout for grabbing secondary threads

Occasional failures have been seen with split-core mode and migration
where the message "KVM: couldn't grab cpu" appears.  This increases
the length of time that we wait from 1ms to 10ms, which seems to
work around the issue.

Signed-off-by: Paul Mackerras <paulus@samba.org>
Signed-off-by: Alexander Graf <agraf@suse.de>

diff --git a/arch/powerpc/kvm/book3s_hv.c b/arch/powerpc/kvm/book3s_hv.c
index 27cced9c7249e32ef0660fd14d9ace591e11eba6..4526befd60c5e31bc540383e5bbb1790fdfbfe2b 100644 (file)
--- a/arch/powerpc/kvm/book3s_hv.c
+++ b/arch/powerpc/kvm/book3s_hv.c
@@ -1489,7 +1489,7 @@ static void kvmppc_remove_runnable(struct kvmppc_vcore *vc,
 static int kvmppc_grab_hwthread(int cpu)
 {
        struct paca_struct *tpaca;
-       long timeout = 1000;
+       long timeout = 10000;
 
        tpaca = &paca[cpu];