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-rw-r--r--arch/s390/kvm/intercept.c27
1 files changed, 27 insertions, 0 deletions
diff --git a/arch/s390/kvm/intercept.c b/arch/s390/kvm/intercept.c
index 9966c43c6035..00a79442a428 100644
--- a/arch/s390/kvm/intercept.c
+++ b/arch/s390/kvm/intercept.c
@@ -444,8 +444,35 @@ static int handle_operexc(struct kvm_vcpu *vcpu)
return kvm_s390_inject_program_int(vcpu, PGM_OPERATION);
}
+static int handle_pv_sclp(struct kvm_vcpu *vcpu)
+{
+ struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
+
+ spin_lock(&fi->lock);
+ /*
+ * 2 cases:
+ * a: an sccb answering interrupt was already pending or in flight.
+ * As the sccb value is not known we can simply set some value to
+ * trigger delivery of a saved SCCB. UV will then use its saved
+ * copy of the SCCB value.
+ * b: an error SCCB interrupt needs to be injected so we also inject
+ * a fake SCCB address. Firmware will use the proper one.
+ * This makes sure, that both errors and real sccb returns will only
+ * be delivered after a notification intercept (instruction has
+ * finished) but not after others.
+ */
+ fi->srv_signal.ext_params |= 0x43000;
+ set_bit(IRQ_PEND_EXT_SERVICE, &fi->pending_irqs);
+ clear_bit(IRQ_PEND_EXT_SERVICE, &fi->masked_irqs);
+ spin_unlock(&fi->lock);
+ return 0;
+}
+
static int handle_pv_notification(struct kvm_vcpu *vcpu)
{
+ if (vcpu->arch.sie_block->ipa == 0xb220)
+ return handle_pv_sclp(vcpu);
+
return handle_instruction(vcpu);
}