spapr/xive: add KVM support

This introduces a set of helpers when KVM is in use, which create the
KVM XIVE device, initialize the interrupt sources at a KVM level and
connect the interrupt presenters to the vCPU.

They also handle the initialization of the TIMA and the source ESB
memory regions of the controller. These have a different type under
KVM. They are 'ram device' memory mappings, similarly to VFIO, exposed
to the guest and the associated VMAs on the host are populated
dynamically with the appropriate pages using a fault handler.

Signed-off-by: Cédric Le Goater <clg@kaod.org>
Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
Message-Id: <20190513084245.25755-3-clg@kaod.org>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>

1 files changed, 18 insertions, 3 deletions

diff --git a/hw/intc/xive.c b/hw/intc/xive.c
index dcf2fcd108..78047adb11 100644
--- a/hw/intc/xive.c
+++ b/hw/intc/xive.c
@@ -555,6 +555,15 @@ static void xive_tctx_realize(DeviceState *dev, Error **errp)
         return;
     }
 
+    /* Connect the presenter to the VCPU (required for CPU hotplug) */
+    if (kvm_irqchip_in_kernel()) {
+        kvmppc_xive_cpu_connect(tctx, &local_err);
+        if (local_err) {
+            error_propagate(errp, local_err);
+            return;
+        }
+    }
+
     qemu_register_reset(xive_tctx_reset, dev);
 }
 
@@ -957,6 +966,10 @@ static void xive_source_reset(void *dev)
 
     /* PQs are initialized to 0b01 (Q=1) which corresponds to "ints off" */
     memset(xsrc->status, XIVE_ESB_OFF, xsrc->nr_irqs);
+
+    if (kvm_irqchip_in_kernel()) {
+        kvmppc_xive_source_reset(xsrc, &error_fatal);
+    }
 }
 
 static void xive_source_realize(DeviceState *dev, Error **errp)
@@ -990,9 +1003,11 @@ static void xive_source_realize(DeviceState *dev, Error **errp)
     xsrc->status = g_malloc0(xsrc->nr_irqs);
     xsrc->lsi_map = bitmap_new(xsrc->nr_irqs);
 
-    memory_region_init_io(&xsrc->esb_mmio, OBJECT(xsrc),
-                          &xive_source_esb_ops, xsrc, "xive.esb",
-                          (1ull << xsrc->esb_shift) * xsrc->nr_irqs);
+    if (!kvm_irqchip_in_kernel()) {
+        memory_region_init_io(&xsrc->esb_mmio, OBJECT(xsrc),
+                              &xive_source_esb_ops, xsrc, "xive.esb",
+                              (1ull << xsrc->esb_shift) * xsrc->nr_irqs);
+    }
 
     qemu_register_reset(xive_source_reset, dev);
 }