[Xen-devel] [RFC PATCH v2 24/26] ARM: vITS: create and initialize virtual ITSes for Dom0

[Andre Przywara <andre.przywara@xxxxxxx>]

For each hardware ITS create and initialize a virtual ITS for Dom0.
We use the same memory mapped address to keep the doorbell working.

Signed-off-by: Andre Przywara <andre.przywara@xxxxxxx>
---
 xen/arch/arm/vgic-its.c       | 22 ++++++++++++++++++++++
 xen/arch/arm/vgic-v3.c        | 12 ++++++++++++
 xen/include/asm-arm/domain.h  |  1 +
 xen/include/asm-arm/gic-its.h | 13 +++++++++++++
 4 files changed, 48 insertions(+)

diff --git a/xen/arch/arm/vgic-its.c b/xen/arch/arm/vgic-its.c
index c130d98..2eec468 100644
--- a/xen/arch/arm/vgic-its.c
+++ b/xen/arch/arm/vgic-its.c
@@ -810,6 +810,28 @@ static const struct mmio_handler_ops vgic_its_mmio_handler 
= {
     .write = vgic_v3_its_mmio_write,
 };
 
+int vgic_v3_its_init_virtual(struct domain *d, struct host_its *hw_its,
+                             paddr_t guest_addr)
+{
+    struct virt_its *its;
+
+    its = xzalloc(struct virt_its);
+    if ( ! its )
+        return -ENOMEM;
+
+    its->d = d;
+    its->hw_its = hw_its;
+    its->baser0 = 0x7917000000000400;
+    its->baser1 = 0x3c01000000000400;
+    its->cbaser = 0x380e000000000400;
+    spin_lock_init(&its->vcmd_lock);
+    spin_lock_init(&its->its_lock);
+
+    register_mmio_handler(d, &vgic_its_mmio_handler, guest_addr, SZ_64K, its);
+
+    return 0;
+}
+
 /*
  * Local variables:
  * mode: C
diff --git a/xen/arch/arm/vgic-v3.c b/xen/arch/arm/vgic-v3.c
index a9b04ab..1c682d1 100644
--- a/xen/arch/arm/vgic-v3.c
+++ b/xen/arch/arm/vgic-v3.c
@@ -31,6 +31,7 @@
 #include <asm/current.h>
 #include <asm/mmio.h>
 #include <asm/gic_v3_defs.h>
+#include <asm/gic-its.h>
 #include <asm/vgic.h>
 #include <asm/vgic-emul.h>
 #include <asm/vreg.h>
@@ -1644,6 +1645,7 @@ static int vgic_v3_domain_init(struct domain *d)
      */
     if ( is_hardware_domain(d) )
     {
+        struct host_its *hw_its;
         unsigned int first_cpu = 0;
 
         d->arch.vgic.dbase = vgic_v3_hw.dbase;
@@ -1669,6 +1671,16 @@ static int vgic_v3_domain_init(struct domain *d)
 
             first_cpu += size / d->arch.vgic.rdist_stride;
         }
+        d->arch.vgic.nr_regions = vgic_v3_hw.nr_rdist_regions;
+
+        list_for_each_entry(hw_its, &host_its_list, entry)
+        {
+            /* Emulate the control registers frame (lower 64K). */
+            vgic_v3_its_init_virtual(d, hw_its, hw_its->addr);
+
+            d->arch.vgic.has_its = true;
+        }
+
     }
     else
     {
diff --git a/xen/include/asm-arm/domain.h b/xen/include/asm-arm/domain.h
index 543d058..6890b3b 100644
--- a/xen/include/asm-arm/domain.h
+++ b/xen/include/asm-arm/domain.h
@@ -114,6 +114,7 @@ struct arch_domain
         uint8_t *proptable;
         struct list_head its_devices;       /* devices mapped to an ITS */
         spinlock_t its_devices_lock;        /* protects the its_devices list */
+        bool has_its;
 #endif
     } vgic;
 
diff --git a/xen/include/asm-arm/gic-its.h b/xen/include/asm-arm/gic-its.h
index c5355f9..9956afb 100644
--- a/xen/include/asm-arm/gic-its.h
+++ b/xen/include/asm-arm/gic-its.h
@@ -130,6 +130,13 @@ void gicv3_set_redist_addr(paddr_t address, int redist_id);
 /* Map a collection for this host CPU to each host ITS. */
 void gicv3_its_setup_collection(int cpu);
 
+/* Create and register a virtual ITS at the given guest address.
+ * If a host ITS is specified, a hardware domain can reach out to that host
+ * ITS to deal with devices and LPI mappings and can enable/disable LPIs.
+ */
+int vgic_v3_its_init_virtual(struct domain *d, struct host_its *hw_its,
+                             paddr_t guest_addr);
+
 /* Map a device on the host by allocating an ITT on the host (ITS).
  * "bits" specifies how many events (interrupts) this device will need.
  * Setting "valid" to false deallocates the device.
@@ -175,6 +182,12 @@ static inline int gicv3_its_map_device(struct domain *d, 
int host_devid,
 {
     return -ENODEV;
 }
+static inline int vgic_v3_its_init_virtual(struct domain *d,
+                                           struct host_its *hw_its,
+                                           paddr_t guest_addr)
+{
+    return 0;
+}
 
 #endif /* CONFIG_HAS_ITS */
 
-- 
2.9.0


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