[Xen-devel] [RFC PATCH v2 17/26] ARM: vITS: handle MAPC command

[Andre Przywara <andre.przywara@xxxxxxx>]

The MAPC command associates a given collection ID with a given
redistributor, thus mapping collections to VCPUs.
We just store the vcpu_id in the collection table for that.

Signed-off-by: Andre Przywara <andre.przywara@xxxxxxx>
---
 xen/arch/arm/vgic-its.c | 30 ++++++++++++++++++++++++++++++
 1 file changed, 30 insertions(+)

diff --git a/xen/arch/arm/vgic-its.c b/xen/arch/arm/vgic-its.c
index 612f55b..b425776 100644
--- a/xen/arch/arm/vgic-its.c
+++ b/xen/arch/arm/vgic-its.c
@@ -228,6 +228,33 @@ out_unlock:
     return ret;
 }
 
+static int its_handle_mapc(struct virt_its *its, uint64_t *cmdptr)
+{
+    uint32_t collid = its_cmd_get_collection(cmdptr);
+    uint64_t rdbase = its_cmd_mask_field(cmdptr, 2, 16, 44);
+    int ret = -1;
+
+    if ( collid >= its->max_collections )
+        return ret;
+
+    if ( rdbase >= its->d->max_vcpus )
+        return ret;
+
+    spin_lock(&its->its_lock);
+    if ( its->coll_table )
+    {
+        if ( its_cmd_get_validbit(cmdptr) )
+            its->coll_table[collid] = rdbase;
+        else
+            its->coll_table[collid] = UNMAPPED_COLLECTION;
+
+        ret = 0;
+    }
+    spin_unlock(&its->its_lock);
+
+    return ret;
+}
+
 #define ITS_CMD_BUFFER_SIZE(baser)      ((((baser) & 0xff) + 1) << 12)
 
 static int vgic_its_handle_cmds(struct domain *d, struct virt_its *its,
@@ -254,6 +281,9 @@ static int vgic_its_handle_cmds(struct domain *d, struct 
virt_its *its,
         case GITS_CMD_INT:
             its_handle_int(its, cmdptr);
             break;
+        case GITS_CMD_MAPC:
+            its_handle_mapc(its, cmdptr);
+            break;
         case GITS_CMD_SYNC:
             /* We handle ITS commands synchronously, so we ignore SYNC. */
            break;
-- 
2.9.0


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