x86/vioapic: bind interrupts to PVH Dom0

Add the glue in order to bind the PVH Dom0 GSI from bare metal. This is done
when Dom0 unmasks the vIO APIC pins, by fetching the current pin settings and
setting up the PIRQ, which will then be bound to Dom0 using the newly
introduced PT_IRQ_TYPE_GSI bind type.

Signed-off-by: Roger Pau Monné <roger.pau@citrix.com>
---
Cc: Jan Beulich <jbeulich@suse.com>
Cc: Andrew Cooper <andrew.cooper3@citrix.com>

diff --git a/xen/arch/x86/hvm/vioapic.c b/xen/arch/x86/hvm/vioapic.c
index 52555cd32851551b114b2f3fbb5e8405a73603fe..527ac2aadd79f748291175cc3119d241dee48e11 100644 (file)
--- a/xen/arch/x86/hvm/vioapic.c
+++ b/xen/arch/x86/hvm/vioapic.c
@@ -202,6 +202,34 @@ static void vioapic_write_redirent(
         unmasked = unmasked && !ent.fields.mask;
     }
 
+    if ( is_hardware_domain(d) && unmasked )
+    {
+        xen_domctl_bind_pt_irq_t pt_irq_bind = {
+            .irq_type = PT_IRQ_TYPE_GSI,
+            .machine_irq = gsi,
+            .u.gsi.gsi = gsi,
+            .hvm_domid = DOMID_SELF,
+        };
+        int ret, pirq = gsi;
+
+        /* Interrupt has been unmasked, bind it now. */
+        ret = mp_register_gsi(gsi, ent.fields.trig_mode, ent.fields.polarity);
+        if ( ret && ret != -EEXIST )
+        {
+            gdprintk(XENLOG_WARNING,
+                     "%s: error registering GSI %u: %d\n", __func__, gsi, ret);
+        }
+        if ( !ret )
+        {
+            ret = physdev_map_pirq(DOMID_SELF, MAP_PIRQ_TYPE_GSI, &pirq, &pirq,
+                                   NULL);
+            BUG_ON(ret);
+
+            ret = pt_irq_create_bind(d, &pt_irq_bind);
+            BUG_ON(ret);
+        }
+    }
+
     *pent = ent;
 
     if ( gsi == 0 )