On 18.02.20 10:50, David Hildenbrand wrote:
> On 14.02.20 23:26, Christian Borntraeger wrote:
>> From: Janosch Frank <frankja@xxxxxxxxxxxxx>
>>
>> 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@xxxxxxxxxxxxx>
>> Reviewed-by: Thomas Huth <thuth@xxxxxxxxxx>
>> Reviewed-by: Cornelia Huck <cohuck@xxxxxxxxxx>
>> [borntraeger@xxxxxxxxxx: patch merging, splitting, fixing]
>> Signed-off-by: Christian Borntraeger <borntraeger@xxxxxxxxxx>
>> ---
>> arch/s390/include/asm/uv.h | 1 +
>> arch/s390/kvm/kvm-s390.c | 8 ++++++++
>> include/uapi/linux/kvm.h | 1 +
>> 3 files changed, 10 insertions(+)
>>
>> diff --git a/arch/s390/include/asm/uv.h b/arch/s390/include/asm/uv.h
>> index 7b82881ec3b4..d59825d95b9d 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 5426b01e3da1..b6113285f47f 100644
>> --- a/arch/s390/kvm/kvm-s390.c
>> +++ b/arch/s390/kvm/kvm-s390.c
>> @@ -4656,6 +4656,14 @@ static int kvm_s390_handle_pv_vcpu(struct kvm_vcpu *vcpu,
>> r = kvm_s390_pv_destroy_cpu(vcpu, &cmd->rc, &cmd->rrc);
>> break;
>> }
>> + case KVM_PV_VCPU_SET_IPL_PSW: {
>> + if (!kvm_s390_pv_handle_cpu(vcpu))
>> + return -EINVAL;
>> +
>> + r = kvm_s390_pv_set_cpu_state(vcpu, PV_CPU_STATE_OPR_LOAD,
>> + &cmd->rc, &cmd->rrc);
>
> Can we squeeze that into kvm_arch_vcpu_ioctl_set_mpstate() instead? The
> interface seems to do exactly what you want it to do.
>
> KVM_MP_STATE_OPERATING_LOAD
>
> Allow it only when in PV.
Ack, something like this seems to work.
diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c
index a95c82089386..9496616cccc7 100644
--- a/arch/s390/kvm/kvm-s390.c
+++ b/arch/s390/kvm/kvm-s390.c
@@ -3710,6 +3710,12 @@ int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu,
kvm_s390_vcpu_start(vcpu);
break;
case KVM_MP_STATE_LOAD:
+ if (!kvm_s390_pv_cpu_is_protected(vcpu)) {
+ rc = -ENXIO;
+ break;
+ }
+ 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:
