[Xen-devel] [PATCH v4 18/27] 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-v3-its.c | 46 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 46 insertions(+)

diff --git a/xen/arch/arm/vgic-v3-its.c b/xen/arch/arm/vgic-v3-its.c
index dd43eaf..639fbbf 100644
--- a/xen/arch/arm/vgic-v3-its.c
+++ b/xen/arch/arm/vgic-v3-its.c
@@ -87,6 +87,26 @@ static paddr_t get_baser_phys_addr(uint64_t reg)
         return reg & GENMASK_ULL(47, 12);
 }
 
+static int its_set_collection(struct virt_its *its, uint16_t collid,
+                              uint16_t vcpu_id)
+{
+    paddr_t addr = get_baser_phys_addr(its->baser_coll);
+    uint16_t *coll_table;
+
+    if ( collid >= its->max_collections )
+        return -ENOENT;
+
+    coll_table = map_one_guest_page(its->d, addr + collid * sizeof(uint16_t));
+    if ( !coll_table )
+        return -EFAULT;
+
+    *coll_table = vcpu_id;
+
+    unmap_one_guest_page(coll_table);
+
+    return 0;
+}
+
 /* Must be called with the ITS lock held. */
 static struct vcpu *get_vcpu_from_collection(struct virt_its *its,
                                              uint16_t collid)
@@ -324,6 +344,29 @@ static int its_handle_int(struct virt_its *its, uint64_t 
*cmdptr)
     return 0;
 }
 
+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);
+
+    if ( collid >= its->max_collections )
+        return -1;
+
+    if ( rdbase >= its->d->max_vcpus )
+        return -1;
+
+    spin_lock(&its->its_lock);
+
+    if ( its_cmd_get_validbit(cmdptr) )
+        its_set_collection(its, collid, rdbase);
+    else
+        its_set_collection(its, collid, UNMAPPED_COLLECTION);
+
+    spin_unlock(&its->its_lock);
+
+    return 0;
+}
+
 #define ITS_CMD_BUFFER_SIZE(baser)      ((((baser) & 0xff) + 1) << 12)
 
 static int vgic_its_handle_cmds(struct domain *d, struct virt_its *its,
@@ -367,6 +410,9 @@ static int vgic_its_handle_cmds(struct domain *d, struct 
virt_its *its,
         case GITS_CMD_INT:
             ret = its_handle_int(its, cmdptr);
             break;
+        case GITS_CMD_MAPC:
+            ret = its_handle_mapc(its, cmdptr);
+            break;
         case GITS_CMD_SYNC:
             /* We handle ITS commands synchronously, so we ignore SYNC. */
            break;
-- 
2.9.0


_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxx
https://lists.xen.org/xen-devel