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Commit 383d0b05 authored by Jens Freimann's avatar Jens Freimann Committed by Christian Borntraeger
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KVM: s390: handle pending local interrupts via bitmap 



This patch adapts handling of local interrupts to be more compliant with
the z/Architecture Principles of Operation and introduces a data
structure
which allows more efficient handling of interrupts.

* get rid of li->active flag, use bitmap instead
* Keep interrupts in a bitmap instead of a list
* Deliver interrupts in the order of their priority as defined in the
  PoP
* Use a second bitmap for sigp emergency requests, as a CPU can have
  one request pending from every other CPU in the system.

Signed-off-by: default avatarJens Freimann <jfrei@linux.vnet.ibm.com>
Reviewed-by: default avatarCornelia Huck <cornelia.huck@de.ibm.com>
Reviewed-by: default avatarDavid Hildenbrand <dahi@linux.vnet.ibm.com>
Signed-off-by: default avatarChristian Borntraeger <borntraeger@de.ibm.com>
parent c0e6159d

arch/s390/include/asm/kvm_host.h

+0 −2
Original line number Diff line number Diff line
@@ -398,8 +398,6 @@ struct kvm_s390_irq_payload { 


struct kvm_s390_local_interrupt {

	spinlock_t lock;

	struct list_head list;

	atomic_t active;

	struct kvm_s390_float_interrupt *float_int;

	wait_queue_head_t *wq;

	atomic_t *cpuflags;

arch/s390/kvm/intercept.c

+2 −2
Original line number Diff line number Diff line
@@ -257,7 +257,7 @@ static int handle_instruction_and_prog(struct kvm_vcpu *vcpu) 
static int handle_external_interrupt(struct kvm_vcpu *vcpu)

{

	u16 eic = vcpu->arch.sie_block->eic;

	struct kvm_s390_interrupt irq;

	struct kvm_s390_irq irq;

	psw_t newpsw;

	int rc;
@@ -282,7 +282,7 @@ static int handle_external_interrupt(struct kvm_vcpu *vcpu) 
		if (kvm_s390_si_ext_call_pending(vcpu))

			return 0;

		irq.type = KVM_S390_INT_EXTERNAL_CALL;

		irq.parm = vcpu->arch.sie_block->extcpuaddr;

		irq.u.extcall.code = vcpu->arch.sie_block->extcpuaddr;

		break;

	default:

		return -EOPNOTSUPP;