KVM: PPC: Book3S: Add API for in-kernel XICS emulation
This adds the API for userspace to instantiate an XICS device in a VM
and connect VCPUs to it. The API consists of a new device type for
the KVM_CREATE_DEVICE ioctl, a new capability KVM_CAP_IRQ_XICS, which
functions similarly to KVM_CAP_IRQ_MPIC, and the KVM_IRQ_LINE ioctl,
which is used to assert and deassert interrupt inputs of the XICS.
The XICS device has one attribute group, KVM_DEV_XICS_GRP_SOURCES.
Each attribute within this group corresponds to the state of one
interrupt source. The attribute number is the same as the interrupt
source number.
This does not support irq routing or irqfd yet.
Signed-off-by: Paul Mackerras <paulus@samba.org>
Acked-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Alexander Graf <agraf@suse.de>
diff --git a/arch/powerpc/kvm/powerpc.c b/arch/powerpc/kvm/powerpc.c
index 270773f..6316ee3 100644
--- a/arch/powerpc/kvm/powerpc.c
+++ b/arch/powerpc/kvm/powerpc.c
@@ -342,6 +342,9 @@
case KVM_CAP_SPAPR_TCE:
case KVM_CAP_PPC_ALLOC_HTAB:
case KVM_CAP_PPC_RTAS:
+#ifdef CONFIG_KVM_XICS
+ case KVM_CAP_IRQ_XICS:
+#endif
r = 1;
break;
#endif /* CONFIG_PPC_BOOK3S_64 */
@@ -837,6 +840,25 @@
break;
}
#endif
+#ifdef CONFIG_KVM_XICS
+ case KVM_CAP_IRQ_XICS: {
+ struct file *filp;
+ struct kvm_device *dev;
+
+ r = -EBADF;
+ filp = fget(cap->args[0]);
+ if (!filp)
+ break;
+
+ r = -EPERM;
+ dev = kvm_device_from_filp(filp);
+ if (dev)
+ r = kvmppc_xics_connect_vcpu(dev, vcpu, cap->args[1]);
+
+ fput(filp);
+ break;
+ }
+#endif /* CONFIG_KVM_XICS */
default:
r = -EINVAL;
break;