fix(remote_io): translation between virt and abs remote IO ID

This patch resolves the translation between the virtual remote IO ID and the absolute remote IO ID utilized by the Bao Hypervisor. Specifically, the absolute remote IO ID is obtained by indexing the list of IO devices within the Backend VM using the virtual remote IO ID as index. Signed-off-by: joaopeixoto13 <[email protected]>
bao-project · Apr 15, 2024 · 08070a4 · 08070a4
1 parent bf2fc92
commit 08070a4
Showing 1 changed file with 3 additions and 17 deletions.
diff --git a/src/core/remote_io.c b/src/core/remote_io.c
@@ -381,25 +381,11 @@ unsigned long remote_io_hypercall(unsigned long arg0, unsigned long arg1, unsign
     unsigned long cpu_id = cpu()->vcpu->regs.x[7];
     unsigned long vcpu_id = cpu()->vcpu->regs.x[8];
 
-    unsigned long abs_remote_io_id = 0;
-    bool match = false;
-
-    list_foreach (remote_io_list, struct remote_io, io_device) {
-        if (cpu()->vcpu->vm->id == io_device->instance.backend_vm_id) {
-            if (abs_remote_io_id == virt_remote_io_id) {
-                match = true;
-                break;
-            } else {
-                abs_remote_io_id++;
-            }
-        }
-    }
-
-    if (!match) {
-        WARNING("No matching for Remote I/O ID (%d) within VM (%d)", virt_remote_io_id,
-            cpu()->vcpu->vm->id);
+    if (virt_remote_io_id > config.vmlist[cpu()->vcpu->vm->id].platform.remote_io_dev_num) {
+        WARNING("Remote I/O ID (%d) is out of range", virt_remote_io_id);
         return -HC_E_FAILURE;
     }
+    unsigned long abs_remote_io_id = config.vmlist[cpu()->vcpu->vm->id].platform.remote_io_devs[virt_remote_io_id].remote_io_id;
 
     switch (op) {
         case IO_WRITE_OP: