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authorPaul Mackerras <paulus@samba.org>2013-09-06 13:23:21 +1000
committerAlexander Graf <agraf@suse.de>2013-10-17 14:45:00 +0200
commit42d7604d0c5a24f448983424eb19e3845cb031ba (patch)
treeb0d6683cbc35854fda611cb3a7b740b42c3dfb13 /arch/powerpc
parentc0867fd50943d71d9f0bc5078393ce4ec76b3923 (diff)
downloadop-kernel-dev-42d7604d0c5a24f448983424eb19e3845cb031ba.zip
op-kernel-dev-42d7604d0c5a24f448983424eb19e3845cb031ba.tar.gz
KVM: PPC: Book3S HV: Implement H_CONFER
The H_CONFER hypercall is used when a guest vcpu is spinning on a lock held by another vcpu which has been preempted, and the spinning vcpu wishes to give its timeslice to the lock holder. We implement this in the straightforward way using kvm_vcpu_yield_to(). Signed-off-by: Paul Mackerras <paulus@samba.org> Signed-off-by: Alexander Graf <agraf@suse.de>
Diffstat (limited to 'arch/powerpc')
-rw-r--r--arch/powerpc/kvm/book3s_hv.c9
1 files changed, 9 insertions, 0 deletions
diff --git a/arch/powerpc/kvm/book3s_hv.c b/arch/powerpc/kvm/book3s_hv.c
index 56f57af..a010aa4 100644
--- a/arch/powerpc/kvm/book3s_hv.c
+++ b/arch/powerpc/kvm/book3s_hv.c
@@ -538,6 +538,15 @@ int kvmppc_pseries_do_hcall(struct kvm_vcpu *vcpu)
}
break;
case H_CONFER:
+ target = kvmppc_get_gpr(vcpu, 4);
+ if (target == -1)
+ break;
+ tvcpu = kvmppc_find_vcpu(vcpu->kvm, target);
+ if (!tvcpu) {
+ ret = H_PARAMETER;
+ break;
+ }
+ kvm_vcpu_yield_to(tvcpu);
break;
case H_REGISTER_VPA:
ret = do_h_register_vpa(vcpu, kvmppc_get_gpr(vcpu, 4),
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