virt: acrn: Introduce I/O ranges operation interfaces

An I/O request of a User VM, which is constructed by hypervisor, is
distributed by the ACRN Hypervisor Service Module to an I/O client
corresponding to the address range of the I/O request.

I/O client maintains a list of address ranges. Introduce
acrn_ioreq_range_{add,del}() to manage these address ranges.

Cc: Zhi Wang <zhi.a.wang@intel.com>
Cc: Zhenyu Wang <zhenyuw@linux.intel.com>
Cc: Yu Wang <yu1.wang@intel.com>
Cc: Reinette Chatre <reinette.chatre@intel.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Reviewed-by: Reinette Chatre <reinette.chatre@intel.com>
Signed-off-by: Shuo Liu <shuo.a.liu@intel.com>
Link: https://lore.kernel.org/r/20210207031040.49576-15-shuo.a.liu@intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/virt/acrn/acrn_drv.h b/drivers/virt/acrn/acrn_drv.h
index 068f0be..8a7d772 100644 (file)
--- a/drivers/virt/acrn/acrn_drv.h
+++ b/drivers/virt/acrn/acrn_drv.h
@@ -197,6 +197,10 @@ struct acrn_ioreq_client *acrn_ioreq_client_create(struct acrn_vm *vm,
                                                   void *data, bool is_default,
                                                   const char *name);
 void acrn_ioreq_client_destroy(struct acrn_ioreq_client *client);
+int acrn_ioreq_range_add(struct acrn_ioreq_client *client,
+                        u32 type, u64 start, u64 end);
+void acrn_ioreq_range_del(struct acrn_ioreq_client *client,
+                         u32 type, u64 start, u64 end);
 
 int acrn_msi_inject(struct acrn_vm *vm, u64 msi_addr, u64 msi_data);
 

diff --git a/drivers/virt/acrn/ioreq.c b/drivers/virt/acrn/ioreq.c
index d19c055..80b2e3f 100644 (file)
--- a/drivers/virt/acrn/ioreq.c
+++ b/drivers/virt/acrn/ioreq.c
@@ -103,6 +103,66 @@ int acrn_ioreq_request_default_complete(struct acrn_vm *vm, u16 vcpu)
        return ret;
 }
 
+/**
+ * acrn_ioreq_range_add() - Add an iorange monitored by an ioreq client
+ * @client:    The ioreq client
+ * @type:      Type (ACRN_IOREQ_TYPE_MMIO or ACRN_IOREQ_TYPE_PORTIO)
+ * @start:     Start address of iorange
+ * @end:       End address of iorange
+ *
+ * Return: 0 on success, <0 on error
+ */
+int acrn_ioreq_range_add(struct acrn_ioreq_client *client,
+                        u32 type, u64 start, u64 end)
+{
+       struct acrn_ioreq_range *range;
+
+       if (end < start) {
+               dev_err(acrn_dev.this_device,
+                       "Invalid IO range [0x%llx,0x%llx]\n", start, end);
+               return -EINVAL;
+       }
+
+       range = kzalloc(sizeof(*range), GFP_KERNEL);
+       if (!range)
+               return -ENOMEM;
+
+       range->type = type;
+       range->start = start;
+       range->end = end;
+
+       write_lock_bh(&client->range_lock);
+       list_add(&range->list, &client->range_list);
+       write_unlock_bh(&client->range_lock);
+
+       return 0;
+}
+
+/**
+ * acrn_ioreq_range_del() - Del an iorange monitored by an ioreq client
+ * @client:    The ioreq client
+ * @type:      Type (ACRN_IOREQ_TYPE_MMIO or ACRN_IOREQ_TYPE_PORTIO)
+ * @start:     Start address of iorange
+ * @end:       End address of iorange
+ */
+void acrn_ioreq_range_del(struct acrn_ioreq_client *client,
+                         u32 type, u64 start, u64 end)
+{
+       struct acrn_ioreq_range *range;
+
+       write_lock_bh(&client->range_lock);
+       list_for_each_entry(range, &client->range_list, list) {
+               if (type == range->type &&
+                   start == range->start &&
+                   end == range->end) {
+                       list_del(&range->list);
+                       kfree(range);
+                       break;
+               }
+       }
+       write_unlock_bh(&client->range_lock);
+}
+
 /*
  * ioreq_task() is the execution entity of handler thread of an I/O client.
  * The handler callback of the I/O client is called within the handler thread.