Re: [PATCH v4 29/36] KVM: s390: protvirt: Support cmd 5 operation state

[Cornelia Huck <cohuck@redhat.com>]

On Tue, 25 Feb 2020 08:53:01 +0100
Christian Borntraeger <borntraeger@de.ibm.com> wrote:

> On 24.02.20 20:08, David Hildenbrand wrote:
> > On 24.02.20 12:41, Christian Borntraeger wrote:  
> >> From: Janosch Frank <frankja@linux.ibm.com>
> >>
> >> Code 5 for the set cpu state UV call tells the UV to load a PSW from
> >> the SE header (first IPL) or from guest location 0x0 (diag 308 subcode
> >> 0/1). Also it sets the cpu into operating state afterwards, so we can
> >> start it.
> >>
> >> Signed-off-by: Janosch Frank <frankja@linux.ibm.com>
> >> Reviewed-by: Thomas Huth <thuth@redhat.com>
> >> Reviewed-by: Cornelia Huck <cohuck@redhat.com>
> >> [borntraeger@de.ibm.com: patch merging, splitting, fixing]
> >> Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
> >> ---
> >>  arch/s390/include/asm/uv.h | 1 +
> >>  arch/s390/kvm/kvm-s390.c   | 6 ++++++
> >>  2 files changed, 7 insertions(+)
> >>
> >> diff --git a/arch/s390/include/asm/uv.h b/arch/s390/include/asm/uv.h
> >> index 99e1a14ef909..4945e44e1528 100644
> >> --- a/arch/s390/include/asm/uv.h
> >> +++ b/arch/s390/include/asm/uv.h
> >> @@ -169,6 +169,7 @@ struct uv_cb_unp {
> >>  #define PV_CPU_STATE_OPR	1
> >>  #define PV_CPU_STATE_STP	2
> >>  #define PV_CPU_STATE_CHKSTP	3
> >> +#define PV_CPU_STATE_OPR_LOAD	5
> >>  
> >>  struct uv_cb_cpu_set_state {
> >>  	struct uv_cb_header header;
> >> diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c
> >> index f10cce6fc5e0..9c0ab66128fd 100644
> >> --- a/arch/s390/kvm/kvm-s390.c
> >> +++ b/arch/s390/kvm/kvm-s390.c
> >> @@ -3728,6 +3728,12 @@ int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu,
> >>  		rc = kvm_s390_vcpu_start(vcpu);
> >>  		break;
> >>  	case KVM_MP_STATE_LOAD:
> >> +		if (!kvm_s390_pv_cpu_is_protected(vcpu)) {
> >> +			rc = -ENXIO;
> >> +			break;
> >> +		}
> >> +		rc = kvm_s390_pv_set_cpu_state(vcpu, PV_CPU_STATE_OPR_LOAD);
> >> +		break;
> >>  	case KVM_MP_STATE_CHECK_STOP:
> >>  		/* fall through - CHECK_STOP and LOAD are not supported yet */
> >>  	default:
> >>  
> > 
> > Fits in nicely :)
> > 
> > Reviewed-by: David Hildenbrand <david@redhat.com>  
> 
> Thanks. FWIW, I will drop Thomas and Conny RB as this was for the older version.

You can have mine back:

Reviewed-by: Cornelia Huck <cohuck@redhat.com>