KVM: s390: add ioctl to inject local interrupts

We have introduced struct kvm_s390_irq a while ago which allows to
inject all kinds of interrupts as defined in the Principles of
Operation.
Add ioctl to inject interrupts with the extended struct kvm_s390_irq

Signed-off-by: Jens Freimann <jfrei@linux.vnet.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Acked-by: Cornelia Huck <cornelia.huck@de.ibm.com>

diff --git a/Documentation/virtual/kvm/api.txt b/Documentation/virtual/kvm/api.txt
index 0d7fc66289a0adb6624338eccf8b1536518ab92b..a7c651d0dc63a18744c5b4a132f4b459ff1443c7 100644 (file)
--- a/Documentation/virtual/kvm/api.txt
+++ b/Documentation/virtual/kvm/api.txt
@@ -2820,6 +2820,62 @@ single frame starting at start_gfn for count frames.
 Note: If any architecturally invalid key value is found in the given data then
 the ioctl will return -EINVAL.
 
+4.92 KVM_S390_IRQ
+
+Capability: KVM_CAP_S390_INJECT_IRQ
+Architectures: s390
+Type: vcpu ioctl
+Parameters: struct kvm_s390_irq (in)
+Returns: 0 on success, -1 on error
+Errors:
+  EINVAL: interrupt type is invalid
+          type is KVM_S390_SIGP_STOP and flag parameter is invalid value
+          type is KVM_S390_INT_EXTERNAL_CALL and code is bigger
+            than the maximum of VCPUs
+  EBUSY:  type is KVM_S390_SIGP_SET_PREFIX and vcpu is not stopped
+          type is KVM_S390_SIGP_STOP and a stop irq is already pending
+          type is KVM_S390_INT_EXTERNAL_CALL and an external call interrupt
+            is already pending
+
+Allows to inject an interrupt to the guest.
+
+Using struct kvm_s390_irq as a parameter allows
+to inject additional payload which is not
+possible via KVM_S390_INTERRUPT.
+
+Interrupt parameters are passed via kvm_s390_irq:
+
+struct kvm_s390_irq {
+       __u64 type;
+       union {
+               struct kvm_s390_io_info io;
+               struct kvm_s390_ext_info ext;
+               struct kvm_s390_pgm_info pgm;
+               struct kvm_s390_emerg_info emerg;
+               struct kvm_s390_extcall_info extcall;
+               struct kvm_s390_prefix_info prefix;
+               struct kvm_s390_stop_info stop;
+               struct kvm_s390_mchk_info mchk;
+               char reserved[64];
+       } u;
+};
+
+type can be one of the following:
+
+KVM_S390_SIGP_STOP - sigp stop; parameter in .stop
+KVM_S390_PROGRAM_INT - program check; parameters in .pgm
+KVM_S390_SIGP_SET_PREFIX - sigp set prefix; parameters in .prefix
+KVM_S390_RESTART - restart; no parameters
+KVM_S390_INT_CLOCK_COMP - clock comparator interrupt; no parameters
+KVM_S390_INT_CPU_TIMER - CPU timer interrupt; no parameters
+KVM_S390_INT_EMERGENCY - sigp emergency; parameters in .emerg
+KVM_S390_INT_EXTERNAL_CALL - sigp external call; parameters in .extcall
+KVM_S390_MCHK - machine check interrupt; parameters in .mchk
+
+
+Note that the vcpu ioctl is asynchronous to vcpu execution.
+
+
 5. The kvm_run structure
 ------------------------
 

diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c
index dbc9ca34d9da1bec12a9d75f0f6cc1e5a3ec57a3..8bc25d405edff23a166a90dff614968012438a83 100644 (file)
--- a/arch/s390/kvm/kvm-s390.c
+++ b/arch/s390/kvm/kvm-s390.c
@@ -177,6 +177,7 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext)
        case KVM_CAP_S390_IRQCHIP:
        case KVM_CAP_VM_ATTRIBUTES:
        case KVM_CAP_MP_STATE:
+       case KVM_CAP_S390_INJECT_IRQ:
        case KVM_CAP_S390_USER_SIGP:
        case KVM_CAP_S390_USER_STSI:
        case KVM_CAP_S390_SKEYS:
@@ -2391,6 +2392,15 @@ long kvm_arch_vcpu_ioctl(struct file *filp,
        long r;
 
        switch (ioctl) {
+       case KVM_S390_IRQ: {
+               struct kvm_s390_irq s390irq;
+
+               r = -EFAULT;
+               if (copy_from_user(&s390irq, argp, sizeof(s390irq)))
+                       break;
+               r = kvm_s390_inject_vcpu(vcpu, &s390irq);
+               break;
+       }
        case KVM_S390_INTERRUPT: {
                struct kvm_s390_interrupt s390int;
                struct kvm_s390_irq s390irq;

diff --git a/include/uapi/linux/kvm.h b/include/uapi/linux/kvm.h
index 1162ef7a3fa1394296beae511a2221ee9dc10d5f..c0632e87a00fe1f263a051e8cd925383afc9bca6 100644 (file)
--- a/include/uapi/linux/kvm.h
+++ b/include/uapi/linux/kvm.h
@@ -802,6 +802,7 @@ struct kvm_ppc_smmu_info {
 #define KVM_CAP_S390_MEM_OP 108
 #define KVM_CAP_S390_USER_STSI 109
 #define KVM_CAP_S390_SKEYS 110
+#define KVM_CAP_S390_INJECT_IRQ 113
 
 #ifdef KVM_CAP_IRQ_ROUTING
 
@@ -1182,6 +1183,8 @@ struct kvm_s390_ucas_mapping {
 /* Available with KVM_CAP_S390_SKEYS */
 #define KVM_S390_GET_SKEYS      _IOW(KVMIO, 0xb2, struct kvm_s390_skeys)
 #define KVM_S390_SET_SKEYS      _IOW(KVMIO, 0xb3, struct kvm_s390_skeys)
+/* Available with KVM_CAP_S390_INJECT_IRQ */
+#define KVM_S390_IRQ              _IOW(KVMIO,  0xb4, struct kvm_s390_irq)
 
 #define KVM_DEV_ASSIGN_ENABLE_IOMMU    (1 << 0)
 #define KVM_DEV_ASSIGN_PCI_2_3         (1 << 1)

diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index a1093700f3a41b84fc71591a7465940fdd4a017f..34310a8d24b9300c2f19b9f530b018e854fb05af 100644 (file)
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -2118,7 +2118,7 @@ static long kvm_vcpu_ioctl(struct file *filp,
         * Special cases: vcpu ioctls that are asynchronous to vcpu execution,
         * so vcpu_load() would break it.
         */
-       if (ioctl == KVM_S390_INTERRUPT || ioctl == KVM_INTERRUPT)
+       if (ioctl == KVM_S390_INTERRUPT || ioctl == KVM_S390_IRQ || ioctl == KVM_INTERRUPT)
                return kvm_arch_vcpu_ioctl(filp, ioctl, arg);
 #endif