summaryrefslogtreecommitdiff
path: root/arch/s390/kvm/kvm-s390.h
diff options
context:
space:
mode:
authorMichael Mueller <mimu@linux.vnet.ibm.com>2017-06-12 14:15:19 +0200
committerChristian Borntraeger <borntraeger@de.ibm.com>2018-01-26 11:11:39 +0100
commitd7c5cb0105ddeff56694f4c6222ee7221824bad3 (patch)
tree35cd08dec40a1908dcc8a2dba534c212dd7eb87b /arch/s390/kvm/kvm-s390.h
parent72b523a30d9b9c7f749c3209e13de983aeb919c1 (diff)
KVM: s390: exploit GISA and AIV for emulated interrupts
The adapter interruption virtualization (AIV) facility is an optional facility that comes with functionality expected to increase the performance of adapter interrupt handling for both emulated and passed-through adapter interrupts. With AIV, adapter interrupts can be delivered to the guest without exiting SIE. This patch provides some preparations for using AIV for emulated adapter interrupts (including virtio) if it's available. When using AIV, the interrupts are delivered at the so called GISA by setting the bit corresponding to its Interruption Subclass (ISC) in the Interruption Pending Mask (IPM) instead of inserting a node into the floating interrupt list. To keep the change reasonably small, the handling of this new state is deferred in get_all_floating_irqs and handle_tpi. This patch concentrates on the code handling enqueuement of emulated adapter interrupts, and their delivery to the guest. Note that care is still required for adapter interrupts using AIV, because there is no guarantee that AIV is going to deliver the adapter interrupts pending at the GISA (consider all vcpus idle). When delivering GISA adapter interrupts by the host (usual mechanism) special attention is required to honor interrupt priorities. Empirical results show that the time window between making an interrupt pending at the GISA and doing kvm_s390_deliver_pending_interrupts is sufficient for a guest with at least moderate cpu activity to get adapter interrupts delivered within the SIE, and potentially save some SIE exits (if not other deliverable interrupts). The code will be activated with a follow-up patch. Signed-off-by: Michael Mueller <mimu@linux.vnet.ibm.com> Acked-by: Christian Borntraeger <borntraeger@de.ibm.com> Reviewed-by: David Hildenbrand <david@redhat.com> Reviewed-by: Cornelia Huck <cohuck@redhat.com> Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Diffstat (limited to 'arch/s390/kvm/kvm-s390.h')
-rw-r--r--arch/s390/kvm/kvm-s390.h3
1 files changed, 3 insertions, 0 deletions
diff --git a/arch/s390/kvm/kvm-s390.h b/arch/s390/kvm/kvm-s390.h
index f110fa96807e..bd31b37b0e6f 100644
--- a/arch/s390/kvm/kvm-s390.h
+++ b/arch/s390/kvm/kvm-s390.h
@@ -382,6 +382,9 @@ int kvm_s390_set_irq_state(struct kvm_vcpu *vcpu,
void __user *buf, int len);
int kvm_s390_get_irq_state(struct kvm_vcpu *vcpu,
__u8 __user *buf, int len);
+void kvm_s390_gisa_init(struct kvm *kvm);
+void kvm_s390_gisa_clear(struct kvm *kvm);
+void kvm_s390_gisa_destroy(struct kvm *kvm);
/* implemented in guestdbg.c */
void kvm_s390_backup_guest_per_regs(struct kvm_vcpu *vcpu);