Add new test case for SVE support

This commit adds a new test case to check
the SVE support on the host. It includes
modifications to the configuration file
and updates to the test script. The new
test case checks for the absence of SVE
on the host.

Signed-off-by: Aakanksha Tripathi <[email protected]>

libvirt/tests/cfg/cpu/aarch64_cpu_sve.cfg

@@ -41,9 +41,13 @@
                     vector_lenth_list = '[{"sve":"disable"}, {"sve128":"require"}]'
                     define_error = "yes"
                     expect_msg = "SVE disabled, but SVE vector lengths provided"
+        - no_host_sve_support:
+            only negative_test
+            host_without_sve = "yes"
+            status_error = "yes"
     variants:
         - positive_test:
             status_error = "no"
         - negative_test:
-            only invalid_length, conflict_length
+            only invalid_length, conflict_length, no_host_sve_support
             status_error = "yes"

libvirt/tests/src/cpu/aarch64_cpu_sve.py

@@ -36,6 +36,7 @@ def run(test, params, env):
 
     status_error = "yes" == params.get("status_error", "no")
     define_error = "yes" == params.get("define_error", "no")
+    host_without_sve = "yes" == params.get("host_without_sve", "no")
     expect_sve = "yes" == params.get("expect_sve", "yes")
     expect_msg = params.get("expect_msg", "")
     vector_length = params.get("vector_length", "sve")
@@ -57,10 +58,17 @@ def _prepare_env(vm):
             if (not utils_package.package_install("util-linux")
                     or not utils_package.package_install("util-linux", session)):
                 test.error("Failed to install util-linux")
-            # Cancel test if host doesn't support SVE
-            if process.run(check_sve,
-                           ignore_status=True, shell=True).exit_status:
-                test.cancel("Host doesn't support SVE")
+
+            # Cancel test if the Host doesn't support or supports SVE based on configuration
+            if process.run(check_sve, ignore_status=True, shell=True).exit_status:
+                if not host_without_sve:
+                    test.cancel("Host doesn't support SVE")
+                else:
+                    return
+            else:
+                if host_without_sve:
+                    test.cancel("Host supports SVE")
+
             # To enable SVE: Hardware support && enable kconfig
             # CONFIG_ARM64_SVE
             if session.cmd_status(check_sve_config % current_boot):
@@ -86,7 +94,7 @@ def _get_maxium_sve_length(vm):
             session = vm.wait_for_login(timeout=120)
             ret = session.cmd(get_maxium_sve_length).strip()
             # dmesg record maximum sve length in bytes
-            sve_length_byte = re.search("length (\d+) bytes", ret).groups()[0]
+            sve_length_byte = re.search(r"length (\d+) bytes", ret).groups()[0]
             # Change max_length into sve + length(bit) E.g. sve512
             sve_length_bit = "sve" + str(int(sve_length_byte) * 8)
             logging.debug("guest sve_length_bit is %s" % sve_length_bit)
@@ -155,7 +163,8 @@ def _guest_has_sve(vm):
         except LibvirtXMLError as e:
             if define_error:
                 if not re.search(expect_msg, str(e)):
-                    test.fail("Expect definition failure: %s but got %s" % (expect_msg, str(e)))
+                    test.fail("Expect definition failure: %s but got %s" %
+                              (expect_msg, str(e)))
                 return True
             else:
                 test.error("Failed to define guest: %s" % str(e))