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KVM: s390: Add support for channel I/O instructions.

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Add a new capability, KVM_CAP_S390_CSS_SUPPORT, which will pass
intercepts for channel I/O instructions to userspace. Only I/O
instructions interacting with I/O interrupts need to be handled
in-kernel:

- TEST PENDING INTERRUPTION (tpi) dequeues and stores pending
  interrupts entirely in-kernel.
- TEST SUBCHANNEL (tsch) dequeues pending interrupts in-kernel
  and exits via KVM_EXIT_S390_TSCH to userspace for subchannel-
  related processing.

Reviewed-by: Marcelo Tosatti <mtosatti@redhat.com>
Reviewed-by: Alexander Graf <agraf@suse.de>
Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
This commit is contained in:
Cornelia Huck
2012-12-20 15:32:12 +01:00
committed by Marcelo Tosatti
parent d6712df95b
commit fa6b7fe992
10 changed files with 202 additions and 5 deletions
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37
arch/s390/kvm/interrupt.c
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@@ -709,6 +709,43 @@ int kvm_s390_inject_program_int(struct kvm_vcpu *vcpu, u16 code)
return 0;
}
struct kvm_s390_interrupt_info *kvm_s390_get_io_int(struct kvm *kvm,
u64 cr6, u64 schid)
{
struct kvm_s390_float_interrupt *fi;
struct kvm_s390_interrupt_info *inti, *iter;
if ((!schid && !cr6) || (schid && cr6))
return NULL;
mutex_lock(&kvm->lock);
fi = &kvm->arch.float_int;
spin_lock(&fi->lock);
inti = NULL;
list_for_each_entry(iter, &fi->list, list) {
if (!is_ioint(iter->type))
continue;
if (cr6 && ((cr6 & iter->io.io_int_word) == 0))
continue;
if (schid) {
if (((schid & 0x00000000ffff0000) >> 16) !=
iter->io.subchannel_id)
continue;
if ((schid & 0x000000000000ffff) !=
iter->io.subchannel_nr)
continue;
}
inti = iter;
break;
}
if (inti)
list_del_init(&inti->list);
if (list_empty(&fi->list))
atomic_set(&fi->active, 0);
spin_unlock(&fi->lock);
mutex_unlock(&kvm->lock);
return inti;
}
int kvm_s390_inject_vm(struct kvm *kvm,
struct kvm_s390_interrupt *s390int)
{