Messages in this thread | | | Subject | Re: [PATCH v4 03/14] KVM: s390: pv: avoid stalls for kvm_s390_pv_init_vm | From | Christian Borntraeger <> | Date | Tue, 31 Aug 2021 16:10:19 +0200 |
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On 18.08.21 15:26, Claudio Imbrenda wrote: > When the system is heavily overcommitted, kvm_s390_pv_init_vm might > generate stall notifications. > > Fix this by using uv_call_sched instead of just uv_call. This is ok because > we are not holding spinlocks.
I guess this should only happen for really large guests where the donated memory is also large? > > Signed-off-by: Claudio Imbrenda <imbrenda@linux.ibm.com> > Fixes: 214d9bbcd3a672 ("s390/mm: provide memory management functions for protected KVM guests")
Reviewed-by: Christian Borntraeger <borntraeger@de.ibm.com>
> --- > arch/s390/kvm/pv.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/arch/s390/kvm/pv.c b/arch/s390/kvm/pv.c > index 0a854115100b..00d272d134c2 100644 > --- a/arch/s390/kvm/pv.c > +++ b/arch/s390/kvm/pv.c > @@ -195,7 +195,7 @@ int kvm_s390_pv_init_vm(struct kvm *kvm, u16 *rc, u16 *rrc) > uvcb.conf_base_stor_origin = (u64)kvm->arch.pv.stor_base; > uvcb.conf_virt_stor_origin = (u64)kvm->arch.pv.stor_var; > > - cc = uv_call(0, (u64)&uvcb); > + cc = uv_call_sched(0, (u64)&uvcb); > *rc = uvcb.header.rc; > *rrc = uvcb.header.rrc; > KVM_UV_EVENT(kvm, 3, "PROTVIRT CREATE VM: handle %llx len %llx rc %x rrc %x", >
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