[Xen-devel] [PATCH v5 10/30] ARM: vGICv3: introduce ITS emulation stub

[Andre Przywara <andre.przywara@xxxxxxx>]

Create a new file to hold the emulation code for the ITS widget.
This just holds the data structure and a init and free function for now.

Signed-off-by: Andre Przywara <andre.przywara@xxxxxxx>
---
 xen/arch/arm/Makefile            |  1 +
 xen/arch/arm/vgic-v3-its.c       | 85 ++++++++++++++++++++++++++++++++++++++++
 xen/arch/arm/vgic-v3.c           |  3 ++
 xen/include/asm-arm/gic_v3_its.h | 12 ++++++
 4 files changed, 101 insertions(+)
 create mode 100644 xen/arch/arm/vgic-v3-its.c

diff --git a/xen/arch/arm/Makefile b/xen/arch/arm/Makefile
index 6be85ab..49e1fb2 100644
--- a/xen/arch/arm/Makefile
+++ b/xen/arch/arm/Makefile
@@ -47,6 +47,7 @@ obj-y += traps.o
 obj-y += vgic.o
 obj-y += vgic-v2.o
 obj-$(CONFIG_HAS_GICV3) += vgic-v3.o
+obj-$(CONFIG_HAS_ITS) += vgic-v3-its.o
 obj-y += vm_event.o
 obj-y += vtimer.o
 obj-y += vpsci.o
diff --git a/xen/arch/arm/vgic-v3-its.c b/xen/arch/arm/vgic-v3-its.c
new file mode 100644
index 0000000..94c3c44
--- /dev/null
+++ b/xen/arch/arm/vgic-v3-its.c
@@ -0,0 +1,85 @@
+/*
+ * xen/arch/arm/vgic-v3-its.c
+ *
+ * ARM Interrupt Translation Service (ITS) emulation
+ *
+ * Andre Przywara <andre.przywara@xxxxxxx>
+ * Copyright (c) 2016,2017 ARM Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; under version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <xen/bitops.h>
+#include <xen/config.h>
+#include <xen/domain_page.h>
+#include <xen/lib.h>
+#include <xen/init.h>
+#include <xen/softirq.h>
+#include <xen/irq.h>
+#include <xen/sched.h>
+#include <xen/sizes.h>
+#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>
+
+/*
+ * Data structure to describe a virtual ITS.
+ * If both the vcmd_lock and the its_lock are required, the vcmd_lock must
+ * be taken first.
+ */
+struct virt_its {
+    struct domain *d;
+    unsigned int devid_bits;
+    unsigned int intid_bits;
+    spinlock_t vcmd_lock;       /* Protects the virtual command buffer, which 
*/
+    uint64_t cwriter;           /* consists of CBASER and CWRITER and those   
*/
+    uint64_t creadr;            /* shadow variables cwriter and creadr. */
+    /* Protects the rest of this structure, including the ITS tables. */
+    spinlock_t its_lock;
+    uint64_t cbaser;
+    uint64_t baser_dev, baser_coll;     /* BASER0 and BASER1 for the guest */
+    unsigned int max_collections;
+    unsigned int max_devices;
+    bool enabled;
+};
+
+/*
+ * An Interrupt Translation Table Entry: this is indexed by a
+ * DeviceID/EventID pair and is located in guest memory.
+ */
+struct vits_itte
+{
+    uint32_t vlpi;
+    uint16_t collection;
+    uint16_t pad;
+};
+
+void vgic_v3_its_init_domain(struct domain *d)
+{
+}
+
+void vgic_v3_its_free_domain(struct domain *d)
+{
+}
+
+/*
+ * Local variables:
+ * mode: C
+ * c-file-style: "BSD"
+ * c-basic-offset: 4
+ * indent-tabs-mode: nil
+ * End:
+ */
diff --git a/xen/arch/arm/vgic-v3.c b/xen/arch/arm/vgic-v3.c
index 0679e76..142eb64 100644
--- a/xen/arch/arm/vgic-v3.c
+++ b/xen/arch/arm/vgic-v3.c
@@ -1449,6 +1449,8 @@ static int vgic_v3_domain_init(struct domain *d)
     d->arch.vgic.nr_regions = rdist_count;
     d->arch.vgic.rdist_regions = rdist_regions;
 
+    vgic_v3_its_init_domain(d);
+
     /*
      * Domain 0 gets the hardware address.
      * Guests get the virtual platform layout.
@@ -1521,6 +1523,7 @@ static int vgic_v3_domain_init(struct domain *d)
 
 static void vgic_v3_domain_free(struct domain *d)
 {
+    vgic_v3_its_free_domain(d);
     xfree(d->arch.vgic.rdist_regions);
 }
 
diff --git a/xen/include/asm-arm/gic_v3_its.h b/xen/include/asm-arm/gic_v3_its.h
index 13b3e14..9b0c0ec 100644
--- a/xen/include/asm-arm/gic_v3_its.h
+++ b/xen/include/asm-arm/gic_v3_its.h
@@ -149,6 +149,10 @@ uint64_t gicv3_get_redist_address(unsigned int cpu, bool 
use_pta);
 /* Map a collection for this host CPU to each host ITS. */
 int gicv3_its_setup_collection(unsigned int cpu);
 
+/* Initialize and destroy the per-domain parts of the virtual ITS support. */
+void vgic_v3_its_init_domain(struct domain *d);
+void vgic_v3_its_free_domain(struct domain *d);
+
 int gicv3_allocate_host_lpi_block(struct domain *d, uint32_t *first_lpi);
 void gicv3_free_host_lpi_block(uint32_t first_lpi);
 
@@ -191,6 +195,14 @@ static inline int gicv3_its_setup_collection(unsigned int 
cpu)
     BUG();
 }
 
+static inline void vgic_v3_its_init_domain(struct domain *d)
+{
+}
+
+static inline void vgic_v3_its_free_domain(struct domain *d)
+{
+}
+
 #endif /* CONFIG_HAS_ITS */
 
 #endif
-- 
2.8.2


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