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KVM: s390: implement subfunction processor calls 

While we will not implement interception for query functions yet, we can
and should disable functions that have a control bit based on the given
CPU model.

Let us start with enabling the subfunction interface.

Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Janosch Frank <frankja@linux.vnet.ibm.com>
Reviewed-by: Cornelia Huck <cohuck@redhat.com>
This commit is contained in:
Christian Borntraeger 2019-02-18 07:48:25 -05:00
parent b9fa6d6ee9
commit 346fa2f891
2 changed files with 23 additions and 13 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
arch/s390/include/asm/kvm_host.h
View File

@ -711,6 +711,7 @@ struct s390_io_adapter {
struct kvm_s390_cpu_model {
/* facility mask supported by kvm & hosting machine */
__u64 fac_mask[S390_ARCH_FAC_LIST_SIZE_U64];
struct kvm_s390_vm_cpu_subfunc subfuncs;
/* facility list requested by guest (in dma page) */
__u64 *fac_list;
u64 cpuid;

35
arch/s390/kvm/kvm-s390.c
View File

@ -1266,11 +1266,20 @@ static int kvm_s390_set_processor_feat(struct kvm *kvm,
static int kvm_s390_set_processor_subfunc(struct kvm *kvm,
struct kvm_device_attr *attr)
{
/*
* Once supported by kernel + hw, we have to store the subfunctions
* in kvm->arch and remember that user space configured them.
*/
return -ENXIO;
mutex_lock(&kvm->lock);
if (kvm->created_vcpus) {
mutex_unlock(&kvm->lock);
return -EBUSY;
}
if (copy_from_user(&kvm->arch.model.subfuncs, (void __user *)attr->addr,
sizeof(struct kvm_s390_vm_cpu_subfunc))) {
mutex_unlock(&kvm->lock);
return -EFAULT;
}
mutex_unlock(&kvm->lock);
return 0;
}
static int kvm_s390_set_cpu_model(struct kvm *kvm, struct kvm_device_attr *attr)
@ -1389,12 +1398,11 @@ static int kvm_s390_get_machine_feat(struct kvm *kvm,
static int kvm_s390_get_processor_subfunc(struct kvm *kvm,
struct kvm_device_attr *attr)
{
/*
* Once we can actually configure subfunctions (kernel + hw support),
* we have to check if they were already set by user space, if so copy
* them from kvm->arch.
*/
return -ENXIO;
if (copy_to_user((void __user *)attr->addr, &kvm->arch.model.subfuncs,
sizeof(struct kvm_s390_vm_cpu_subfunc)))
return -EFAULT;
return 0;
}
static int kvm_s390_get_machine_subfunc(struct kvm *kvm,
@ -1405,6 +1413,7 @@ static int kvm_s390_get_machine_subfunc(struct kvm *kvm,
return -EFAULT;
return 0;
}
static int kvm_s390_get_cpu_model(struct kvm *kvm, struct kvm_device_attr *attr)
{
int ret = -ENXIO;
@ -1522,10 +1531,9 @@ static int kvm_s390_vm_has_attr(struct kvm *kvm, struct kvm_device_attr *attr)
case KVM_S390_VM_CPU_PROCESSOR_FEAT:
case KVM_S390_VM_CPU_MACHINE_FEAT:
case KVM_S390_VM_CPU_MACHINE_SUBFUNC:
case KVM_S390_VM_CPU_PROCESSOR_SUBFUNC:
ret = 0;
break;
/* configuring subfunctions is not supported yet */
case KVM_S390_VM_CPU_PROCESSOR_SUBFUNC:
default:
ret = -ENXIO;
break;
@ -2227,6 +2235,7 @@ int kvm_arch_init_vm(struct kvm *kvm, unsigned long type)
kvm->arch.model.fac_list[i] = S390_lowcore.stfle_fac_list[i] &
kvm_s390_fac_base[i];
}
kvm->arch.model.subfuncs = kvm_s390_available_subfunc;
/* we are always in czam mode - even on pre z14 machines */
set_kvm_facility(kvm->arch.model.fac_mask, 138);