[Xen-devel] [PATCH v4 25/27] 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-v3-its.c       | 32 ++++++++++++++++++++++++++++++++
 xen/arch/arm/vgic-v3.c           | 17 +++++++++++++++++
 xen/include/asm-arm/domain.h     |  1 +
 xen/include/asm-arm/gic_v3_its.h | 16 ++++++++++++++++
 4 files changed, 66 insertions(+)

diff --git a/xen/arch/arm/vgic-v3-its.c b/xen/arch/arm/vgic-v3-its.c
index 35a0730..dfb6eb3 100644
--- a/xen/arch/arm/vgic-v3-its.c
+++ b/xen/arch/arm/vgic-v3-its.c
@@ -1080,6 +1080,38 @@ 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, paddr_t guest_addr,
+                             unsigned int devid_bits, unsigned int intid_bits)
+{
+    struct virt_its *its;
+    uint64_t base_attr;
+
+    its = xzalloc(struct virt_its);
+    if ( ! its )
+        return -ENOMEM;
+
+    base_attr  = GIC_BASER_InnerShareable << GITS_BASER_SHAREABILITY_SHIFT;
+    base_attr |= GIC_BASER_CACHE_SameAsInner << 
GITS_BASER_OUTER_CACHEABILITY_SHIFT;
+    base_attr |= GIC_BASER_CACHE_RaWaWb << GITS_BASER_INNER_CACHEABILITY_SHIFT;
+
+    its->cbaser  = base_attr;
+    base_attr |= 0ULL << GITS_BASER_PAGE_SIZE_SHIFT;
+    its->baser_dev  = GITS_BASER_TYPE_DEVICE << GITS_BASER_TYPE_SHIFT;
+    its->baser_dev |= (7ULL << GITS_BASER_ENTRY_SIZE_SHIFT) | base_attr;
+    its->baser_coll  = GITS_BASER_TYPE_COLLECTION << GITS_BASER_TYPE_SHIFT;
+    its->baser_coll |= (1ULL << GITS_BASER_ENTRY_SIZE_SHIFT) | base_attr;
+    its->d = d;
+    its->doorbell_address = guest_addr + ITS_DOORBELL_OFFSET;
+    its->devid_bits = devid_bits;
+    its->intid_bits = intid_bits;
+    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 ebcfc16..3fc309e 100644
--- a/xen/arch/arm/vgic-v3.c
+++ b/xen/arch/arm/vgic-v3.c
@@ -30,6 +30,7 @@
 #include <asm/current.h>
 #include <asm/mmio.h>
 #include <asm/gic_v3_defs.h>
+#include <asm/gic_v3_its.h>
 #include <asm/vgic.h>
 #include <asm/vgic-emul.h>
 #include <asm/vreg.h>
@@ -1582,6 +1583,7 @@ 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;
@@ -1607,6 +1609,21 @@ 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)
+        {
+            /*
+            * For each host ITS create a virtual ITS using the same
+            * base and thus doorbell address.
+            * Use the same number of device ID bits as the host, and
+            * allow 20 bits for the interrupt ID.
+            */
+            vgic_v3_its_init_virtual(d, hw_its->addr, hw_its->devid_bits, 20);
+
+            d->arch.vgic.has_its = true;
+        }
+
     }
     else
     {
diff --git a/xen/include/asm-arm/domain.h b/xen/include/asm-arm/domain.h
index f460457..6a60630 100644
--- a/xen/include/asm-arm/domain.h
+++ b/xen/include/asm-arm/domain.h
@@ -115,6 +115,7 @@ struct arch_domain
         spinlock_t its_devices_lock;        /* Protects the its_devices tree */
         struct radix_tree_root pend_lpi_tree; /* Stores struct pending_irq's */
         rwlock_t pend_lpi_tree_lock;        /* Protects the pend_lpi_tree */
+        bool has_its;
 #endif
     } vgic;
 
diff --git a/xen/include/asm-arm/gic_v3_its.h b/xen/include/asm-arm/gic_v3_its.h
index 3b5f898..fb05311 100644
--- a/xen/include/asm-arm/gic_v3_its.h
+++ b/xen/include/asm-arm/gic_v3_its.h
@@ -154,6 +154,14 @@ uint64_t gicv3_get_redist_address(unsigned int cpu, bool 
use_pta);
 int gicv3_its_setup_collection(unsigned 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, paddr_t guest_addr,
+                            unsigned int devid_bits, unsigned int intid_bits);
+
+/*
  * Map a device on the host by allocating an ITT on the host (ITS).
  * "nr_event" specifies how many events (interrupts) this device will need.
  * Setting "valid" to false deallocates the device.
@@ -219,6 +227,14 @@ static inline void gicv3_its_unmap_all_devices(struct 
domain *d)
 {
 }
 
+static inline int vgic_v3_its_init_virtual(struct domain *d,
+                                           paddr_t guest_addr,
+                                           unsigned int devid_bits,
+                                           unsigned int intid_bits)
+{
+    return 0;
+}
+
 #endif /* CONFIG_HAS_ITS */
 
 #endif
-- 
2.9.0


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