[PATCH] tests/resource: Verify that Xen can deal with invalid resource type

[Oleksandr Tyshchenko <olekstysh@xxxxxxxxx>]

From: Oleksandr Tyshchenko <oleksandr_tyshchenko@xxxxxxxx>

The sign of the presence of a corresponding bugfix is an error
returned on querying the size of an unknown for Xen resource type.

Signed-off-by: Oleksandr Tyshchenko <oleksandr_tyshchenko@xxxxxxxx>
---
Refer https://patchew.org/Xen/20250217102741.4122367-1-olekstysh@xxxxxxxxx/
Current patch should go in with Xen fix from the link above.

1. w/ fix in Xen:

+ ./tests/resource/test-resource
XENMEM_acquire_resource tests
Test x86 PV
  Created d1
  Test grant table
(XEN) [    8.702293] common/grant_table.c:1909:d0v1 Expanding d1 grant table 
from 1 to 32 frames
(XEN) [    8.704499] common/grant_table.c:1909:d0v1 Expanding d1 grant table 
from 32 to 40 frames
Test x86 PVH
  Created d2
  Test grant table
(XEN) [    8.717210] common/grant_table.c:1909:d0v1 Expanding d2 grant table 
from 1 to 32 frames
(XEN) [    8.719477] common/grant_table.c:1909:d0v1 Expanding d2 grant table 
from 32 to 40 frames
 [ ok ]
 [ ok ]
Welcome to Alpine Linux 3.18
Kernel 6.1.19 on an x86_64 (/dev/hvc0)

2. w/o fix in Xen:

+ ./tests/resource/test-resource
XENMEM_acquire_resource tests
Test x86 PV(XEN) [    9.839691] common/grant_table.c:1909:d0v0 Expanding d0 
grant table from 1 to 2 frames
  Created d1
  Test grant table
(XEN) [    9.846621] common/grant_table.c:1909:d0v1 Expanding d1 grant table 
from 1 to 32 frames
(XEN) [    9.848796] common/grant_table.c:1909:d0v1 Expanding d1 grant table 
from 32 to 40 frames
    Fail: Expected error on an invalid resource type, got success
Test x86 PVH
  Created d2
  Test grant table
(XEN) [    9.865235] common/grant_table.c:1909:d0v1 Expanding d2 grant table 
from 1 to 32 frames
(XEN) [    9.867403] common/grant_table.c:1909:d0v1 Expanding d2 grant table 
from 32 to 40 frames
    Fail: Expected error on an invalid resource type, got success
 *   Execution of "/etc/local.d/xen.start" failed.
 [ !! ]
 [ !! ]
Welcome to Alpine Linux 3.18
Kernel 6.1.19 on an x86_64 (/dev/hvc0)
---
---
 tools/tests/resource/test-resource.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/tools/tests/resource/test-resource.c 
b/tools/tests/resource/test-resource.c
index 1b10be16a6..3f5479cf78 100644
--- a/tools/tests/resource/test-resource.c
+++ b/tools/tests/resource/test-resource.c
@@ -123,6 +123,17 @@ static void test_gnttab(uint32_t domid, unsigned int 
nr_frames,
         fail("    Fail: Managed to map gnttab v2 status frames in v1 mode\n");
         xenforeignmemory_unmap_resource(fh, res);
     }
+
+    /*
+     * While at it, verify that an attempt to query the size of an unknown
+     * for Xen resource type fails.
+     */
+    rc = xenforeignmemory_resource_size(
+        fh, domid, 3, 0, &size);
+
+    /* Check that Xen rejected the resource type. */
+    if ( !rc )
+        fail("    Fail: Expected error on an invalid resource type, got 
success\n");
 }
 
 static void test_domain_configurations(void)
-- 
2.34.1