KVM: s390: migration / injection of prog irq ilc

We have to migrate the program irq ilc and someday we will have to
specify the ilc without KVM trying to autodetect the value.

Let's reuse one of the spare fields in our program irq that should
always be set to 0 by user space. Because we also want to make use
of 0 ilcs ("not available"), we need a validity indicator.

If no valid ilc is given, we try to autodetect the ilc via the current
icptcode and icptstatus + parameter and store the valid ilc in the
irq structure.

This has a nice effect: QEMU's making use of KVM_S390_IRQ /
KVM_S390_SET_IRQ_STATE / KVM_S390_GET_IRQ_STATE for migration will
directly migrate the ilc without any changes.

Please note that we use bit 0 as validity and bit 1,2 for the ilc, so
by applying the ilc mask we directly get the ilen which is usually what
we work with.

Reviewed-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: David Hildenbrand <dahi@linux.vnet.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>

1 files changed, 11 insertions, 1 deletions

diff --git a/arch/s390/kvm/interrupt.c b/arch/s390/kvm/interrupt.c
index daa4fdbcc91c..e594a7830022 100644
--- a/arch/s390/kvm/interrupt.c
+++ b/arch/s390/kvm/interrupt.c
@@ -571,7 +571,7 @@ static int __must_check __deliver_prog(struct kvm_vcpu *vcpu)
         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
         struct kvm_s390_pgm_info pgm_info;
         int rc = 0, nullifying = false;
-        u16 ilen = kvm_s390_get_ilen(vcpu);
+        u16 ilen;
 
         spin_lock(&li->lock);
         pgm_info = li->irq.pgm;
@@ -579,6 +579,7 @@ static int __must_check __deliver_prog(struct kvm_vcpu *vcpu)
         memset(&li->irq.pgm, 0, sizeof(pgm_info));
         spin_unlock(&li->lock);
 
+        ilen = pgm_info.flags & KVM_S390_PGM_FLAGS_ILC_MASK;
         VCPU_EVENT(vcpu, 3, "deliver: program irq code 0x%x, ilen:%d",
                    pgm_info.code, ilen);
         vcpu->stat.deliver_program_int++;
@@ -1043,8 +1044,16 @@ static int __inject_prog(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
         trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_PROGRAM_INT,
                                    irq->u.pgm.code, 0);
 
+        if (!(irq->u.pgm.flags & KVM_S390_PGM_FLAGS_ILC_VALID)) {
+                /* auto detection if no valid ILC was given */
+                irq->u.pgm.flags &= ~KVM_S390_PGM_FLAGS_ILC_MASK;
+                irq->u.pgm.flags |= kvm_s390_get_ilen(vcpu);
+                irq->u.pgm.flags |= KVM_S390_PGM_FLAGS_ILC_VALID;
+        }
+
         if (irq->u.pgm.code == PGM_PER) {
                 li->irq.pgm.code |= PGM_PER;
+                li->irq.pgm.flags = irq->u.pgm.flags;
                 /* only modify PER related information */
                 li->irq.pgm.per_address = irq->u.pgm.per_address;
                 li->irq.pgm.per_code = irq->u.pgm.per_code;
@@ -1053,6 +1062,7 @@ static int __inject_prog(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
         } else if (!(irq->u.pgm.code & PGM_PER)) {
                 li->irq.pgm.code = (li->irq.pgm.code & PGM_PER) |
                                    irq->u.pgm.code;
+                li->irq.pgm.flags = irq->u.pgm.flags;
                 /* only modify non-PER information */
                 li->irq.pgm.trans_exc_code = irq->u.pgm.trans_exc_code;
                 li->irq.pgm.mon_code = irq->u.pgm.mon_code;