KVM: s390: Add clock comparator and CPU timer IRQ injection

Add an interface to inject clock comparator and CPU timer interrupts
into the guest. This is needed for handling the external interrupt
interception.

Signed-off-by: Thomas Huth <thuth@linux.vnet.ibm.com>
Reviewed-by: David Hildenbrand <dahi@linux.vnet.ibm.com>
Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>

diff --git a/Documentation/virtual/kvm/api.txt b/Documentation/virtual/kvm/api.txt
index 2014ff1..0581f6c 100644 (file)
--- a/Documentation/virtual/kvm/api.txt
+++ b/Documentation/virtual/kvm/api.txt
@@ -2211,6 +2211,8 @@ KVM_S390_SIGP_STOP (vcpu) - sigp restart
 KVM_S390_PROGRAM_INT (vcpu) - program check; code in parm
 KVM_S390_SIGP_SET_PREFIX (vcpu) - sigp set prefix; prefix address in parm
 KVM_S390_RESTART (vcpu) - restart
+KVM_S390_INT_CLOCK_COMP (vcpu) - clock comparator interrupt
+KVM_S390_INT_CPU_TIMER (vcpu) - CPU timer interrupt
 KVM_S390_INT_VIRTIO (vm) - virtio external interrupt; external interrupt
                           parameters in parm and parm64
 KVM_S390_INT_SERVICE (vm) - sclp external interrupt; sclp parameter in parm

diff --git a/arch/s390/kvm/interrupt.c b/arch/s390/kvm/interrupt.c
index d9526bb..75cd321 100644 (file)
--- a/arch/s390/kvm/interrupt.c
+++ b/arch/s390/kvm/interrupt.c
@@ -27,6 +27,8 @@
 #define IOINT_CSSID_MASK 0x03fc0000
 #define IOINT_AI_MASK 0x04000000
 
+static void deliver_ckc_interrupt(struct kvm_vcpu *vcpu);
+
 static int is_ioint(u64 type)
 {
        return ((type & 0xfffe0000u) != 0xfffe0000u);
@@ -89,6 +91,14 @@ static int __interrupt_is_deliverable(struct kvm_vcpu *vcpu,
                if (vcpu->arch.sie_block->gcr[0] & 0x4000ul)
                        return 1;
                return 0;
+       case KVM_S390_INT_CLOCK_COMP:
+               return ckc_interrupts_enabled(vcpu);
+       case KVM_S390_INT_CPU_TIMER:
+               if (psw_extint_disabled(vcpu))
+                       return 0;
+               if (vcpu->arch.sie_block->gcr[0] & 0x400ul)
+                       return 1;
+               return 0;
        case KVM_S390_INT_SERVICE:
        case KVM_S390_INT_PFAULT_INIT:
        case KVM_S390_INT_PFAULT_DONE:
@@ -166,6 +176,8 @@ static void __set_intercept_indicator(struct kvm_vcpu *vcpu,
        case KVM_S390_INT_PFAULT_INIT:
        case KVM_S390_INT_PFAULT_DONE:
        case KVM_S390_INT_VIRTIO:
+       case KVM_S390_INT_CLOCK_COMP:
+       case KVM_S390_INT_CPU_TIMER:
                if (psw_extint_disabled(vcpu))
                        __set_cpuflag(vcpu, CPUSTAT_EXT_INT);
                else
@@ -326,6 +338,24 @@ static void __do_deliver_interrupt(struct kvm_vcpu *vcpu,
                                    &vcpu->arch.sie_block->gpsw,
                                    sizeof(psw_t));
                break;
+       case KVM_S390_INT_CLOCK_COMP:
+               trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, inti->type,
+                                                inti->ext.ext_params, 0);
+               deliver_ckc_interrupt(vcpu);
+               break;
+       case KVM_S390_INT_CPU_TIMER:
+               trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, inti->type,
+                                                inti->ext.ext_params, 0);
+               rc  = put_guest_lc(vcpu, EXT_IRQ_CPU_TIMER,
+                                  (u16 *)__LC_EXT_INT_CODE);
+               rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
+                                    &vcpu->arch.sie_block->gpsw,
+                                    sizeof(psw_t));
+               rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
+                                   &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
+               rc |= put_guest_lc(vcpu, inti->ext.ext_params,
+                                  (u32 *)__LC_EXT_PARAMS);
+               break;
        case KVM_S390_INT_SERVICE:
                VCPU_EVENT(vcpu, 4, "interrupt: sclp parm:%x",
                           inti->ext.ext_params);
@@ -984,6 +1014,8 @@ int kvm_s390_inject_vcpu(struct kvm_vcpu *vcpu,
                break;
        case KVM_S390_SIGP_STOP:
        case KVM_S390_RESTART:
+       case KVM_S390_INT_CLOCK_COMP:
+       case KVM_S390_INT_CPU_TIMER:
                VCPU_EVENT(vcpu, 3, "inject: type %x", s390int->type);
                inti->type = s390int->type;
                break;

diff --git a/include/uapi/linux/kvm.h b/include/uapi/linux/kvm.h
index 836e15b..2b83cf3 100644 (file)
--- a/include/uapi/linux/kvm.h
+++ b/include/uapi/linux/kvm.h
@@ -416,6 +416,8 @@ struct kvm_s390_psw {
 #define KVM_S390_INT_PFAULT_INIT       0xfffe0004u
 #define KVM_S390_INT_PFAULT_DONE       0xfffe0005u
 #define KVM_S390_MCHK                  0xfffe1000u
+#define KVM_S390_INT_CLOCK_COMP                0xffff1004u
+#define KVM_S390_INT_CPU_TIMER         0xffff1005u
 #define KVM_S390_INT_VIRTIO            0xffff2603u
 #define KVM_S390_INT_SERVICE           0xffff2401u
 #define KVM_S390_INT_EMERGENCY         0xffff1201u