[Xen-devel] [PATCH v9 26/28] ARM: vITS: increase mmio_count for each ITS

[Andre Przywara <andre.przywara@xxxxxxx>]

Increase the count of MMIO regions needed by one for each ITS Dom0 has
to emulate. We emulate the ITSes 1:1 from the hardware, so the number
is the number of host ITSes.

Signed-off-by: Andre Przywara <andre.przywara@xxxxxxx>
---
 xen/arch/arm/vgic-v3-its.c       | 15 +++++++++++++++
 xen/arch/arm/vgic-v3.c           |  3 +++
 xen/include/asm-arm/gic_v3_its.h |  7 +++++++
 3 files changed, 25 insertions(+)

diff --git a/xen/arch/arm/vgic-v3-its.c b/xen/arch/arm/vgic-v3-its.c
index 36faa16..8f6ff11 100644
--- a/xen/arch/arm/vgic-v3-its.c
+++ b/xen/arch/arm/vgic-v3-its.c
@@ -86,6 +86,21 @@ typedef uint64_t dev_table_entry_t;
 #define GITS_BASER_RO_MASK       (GITS_BASER_TYPE_MASK | \
                                   (31UL << GITS_BASER_ENTRY_SIZE_SHIFT))
 
+unsigned int vgic_v3_its_count(const struct domain *d)
+{
+    struct host_its *hw_its;
+    unsigned int ret = 0;
+
+    /* Only Dom0 can use emulated ITSes so far. */
+    if ( !is_hardware_domain(d) )
+        return 0;
+
+    list_for_each_entry(hw_its, &host_its_list, entry)
+        ret++;
+
+    return ret;
+}
+
 int vgic_v3_its_init_domain(struct domain *d)
 {
     spin_lock_init(&d->arch.vgic.its_devices_lock);
diff --git a/xen/arch/arm/vgic-v3.c b/xen/arch/arm/vgic-v3.c
index 6dbdb2e..41cda78 100644
--- a/xen/arch/arm/vgic-v3.c
+++ b/xen/arch/arm/vgic-v3.c
@@ -1802,6 +1802,9 @@ int vgic_v3_init(struct domain *d, int *mmio_count)
     /* GICD region + number of Redistributors */
     *mmio_count = vgic_v3_rdist_count(d) + 1;
 
+    /* one region per ITS */
+    *mmio_count += vgic_v3_its_count(d);
+
     register_vgic_ops(d, &v3_ops);
 
     return 0;
diff --git a/xen/include/asm-arm/gic_v3_its.h b/xen/include/asm-arm/gic_v3_its.h
index 82d788c..927568f 100644
--- a/xen/include/asm-arm/gic_v3_its.h
+++ b/xen/include/asm-arm/gic_v3_its.h
@@ -137,6 +137,8 @@ void gicv3_its_dt_init(const struct dt_device_node *node);
 
 bool gicv3_its_host_has_its(void);
 
+unsigned int vgic_v3_its_count(const struct domain *d);
+
 void gicv3_do_LPI(unsigned int lpi);
 
 int gicv3_lpi_init_rdist(void __iomem * rdist_base);
@@ -196,6 +198,11 @@ static inline bool gicv3_its_host_has_its(void)
     return false;
 }
 
+static inline unsigned int vgic_v3_its_count(const struct domain *d)
+{
+    return 0;
+}
+
 static inline void gicv3_do_LPI(unsigned int lpi)
 {
     /* We don't enable LPIs without an ITS. */
-- 
2.9.0


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