diff mbox series

[v1,2/4] tests/functional: Convert Aspeed aarch64 SDK tests

Message ID 20241112062806.838717-3-clg@redhat.com
State New
Headers show
Series tests/functional: Finish conversion of Aspeed tests | expand

Commit Message

Cédric Le Goater Nov. 12, 2024, 6:28 a.m. UTC
Drop the SSH connection which was introduced in the avocado tests to
workaround read issues when interacting with console.

Signed-off-by: Cédric Le Goater <clg@redhat.com>
---
 tests/avocado/machine_aspeed.py         | 78 --------------------
 tests/functional/meson.build            |  2 +
 tests/functional/test_aarch64_aspeed.py | 97 +++++++++++++++++++++++++
 3 files changed, 99 insertions(+), 78 deletions(-)
 create mode 100644 tests/functional/test_aarch64_aspeed.py

Comments

Thomas Huth Nov. 12, 2024, 6:53 a.m. UTC | #1
On 12/11/2024 07.28, Cédric Le Goater wrote:
> Drop the SSH connection which was introduced in the avocado tests to
> workaround read issues when interacting with console.
> 
> Signed-off-by: Cédric Le Goater <clg@redhat.com>
> ---
>   tests/avocado/machine_aspeed.py         | 78 --------------------
>   tests/functional/meson.build            |  2 +
>   tests/functional/test_aarch64_aspeed.py | 97 +++++++++++++++++++++++++
>   3 files changed, 99 insertions(+), 78 deletions(-)
>   create mode 100644 tests/functional/test_aarch64_aspeed.py
> 
> diff --git a/tests/avocado/machine_aspeed.py b/tests/avocado/machine_aspeed.py
> index 241ef180affc..2240c82abff9 100644
> --- a/tests/avocado/machine_aspeed.py
> +++ b/tests/avocado/machine_aspeed.py
> @@ -59,17 +59,6 @@ def do_test_arm_aspeed_sdk_start(self, image):
>               self, 'boot', '## Loading kernel from FIT Image')
>           self.wait_for_console_pattern('Starting kernel ...')
>   
> -    def do_test_aarch64_aspeed_sdk_start(self, image):
> -        self.vm.set_console()
> -        self.vm.add_args('-drive', 'file=' + image + ',if=mtd,format=raw',
> -                         '-net', 'nic', '-net', 'user,hostfwd=:127.0.0.1:0-:22')
> -
> -        self.vm.launch()
> -
> -        self.wait_for_console_pattern('U-Boot 2023.10')
> -        self.wait_for_console_pattern('## Loading kernel from FIT Image')
> -        self.wait_for_console_pattern('Starting kernel ...')
> -
>       @skipUnless(os.getenv('QEMU_TEST_FLAKY_TESTS'), 'Test is unstable on GitLab')
>       def test_arm_ast2500_evb_sdk(self):
>           """
> @@ -133,70 +122,3 @@ def test_arm_ast2600_evb_sdk(self):
>           year = time.strftime("%Y")
>           self.ssh_command_output_contains('/sbin/hwclock -f /dev/rtc1', year);
>   
> -    def test_aarch64_ast2700_evb_sdk_v09_02(self):
> -        """
> -        :avocado: tags=arch:aarch64
> -        :avocado: tags=machine:ast2700-evb
> -        """
> -
> -        image_url = ('https://github.com/AspeedTech-BMC/openbmc/releases/'
> -                     'download/v09.02/ast2700-default-obmc.tar.gz')
> -        image_hash = 'ac969c2602f4e6bdb69562ff466b89ae3fe1d86e1f6797bb7969d787f82116a7'
> -        image_path = self.fetch_asset(image_url, asset_hash=image_hash,
> -                                      algorithm='sha256')
> -        archive.extract(image_path, self.workdir)
> -
> -        num_cpu = 4
> -        image_dir = self.workdir + '/ast2700-default/'
> -        uboot_size = os.path.getsize(image_dir + 'u-boot-nodtb.bin')
> -        uboot_dtb_load_addr = hex(0x400000000 + uboot_size)
> -
> -        load_images_list = [
> -            {
> -                'addr': '0x400000000',
> -                'file': image_dir + 'u-boot-nodtb.bin'
> -            },
> -            {
> -                'addr': str(uboot_dtb_load_addr),
> -                'file': image_dir + 'u-boot.dtb'
> -            },
> -            {
> -                'addr': '0x430000000',
> -                'file': image_dir + 'bl31.bin'
> -            },
> -            {
> -                'addr': '0x430080000',
> -                'file': image_dir + 'optee/tee-raw.bin'
> -            }
> -        ]
> -
> -        for load_image in load_images_list:
> -            addr = load_image['addr']
> -            file = load_image['file']
> -            self.vm.add_args('-device',
> -                             f'loader,force-raw=on,addr={addr},file={file}')
> -
> -        for i in range(num_cpu):
> -            self.vm.add_args('-device',
> -                             f'loader,addr=0x430000000,cpu-num={i}')
> -
> -        self.vm.add_args('-smp', str(num_cpu))
> -        self.vm.add_args('-device',
> -                         'tmp105,bus=aspeed.i2c.bus.1,address=0x4d,id=tmp-test')
> -        self.do_test_aarch64_aspeed_sdk_start(image_dir + 'image-bmc')
> -        self.wait_for_console_pattern('nodistro.0 ast2700-default ttyS12')
> -
> -        self.ssh_connect('root', '0penBmc', False)
> -        self.ssh_command('dmesg -c > /dev/null')
> -
> -        self.ssh_command_output_contains(
> -            'echo lm75 0x4d > /sys/class/i2c-dev/i2c-1/device/new_device '
> -            '&& dmesg -c',
> -            'i2c i2c-1: new_device: Instantiated device lm75 at 0x4d');
> -
> -        self.ssh_command_output_contains(
> -            'cat /sys/class/hwmon/hwmon20/temp1_input', '0')
> -        self.vm.cmd('qom-set', path='/machine/peripheral/tmp-test',
> -                    property='temperature', value=18000)
> -        self.ssh_command_output_contains(
> -            'cat /sys/class/hwmon/hwmon20/temp1_input', '18000')
> diff --git a/tests/functional/meson.build b/tests/functional/meson.build
> index 758145d1e5fa..c035eba4f9b8 100644
> --- a/tests/functional/meson.build
> +++ b/tests/functional/meson.build
> @@ -11,6 +11,7 @@ endif
>   
>   # Timeouts for individual tests that can be slow e.g. with debugging enabled
>   test_timeouts = {
> +  'aarch64_aspeed' : 600,
>     'aarch64_raspi4' : 480,
>     'aarch64_sbsaref_alpine' : 720,
>     'aarch64_sbsaref_freebsd' : 720,
> @@ -47,6 +48,7 @@ tests_generic_bsduser = [
>   ]
>   
>   tests_aarch64_system_thorough = [
> +  'aarch64_aspeed',
>     'aarch64_raspi3',
>     'aarch64_raspi4',
>     'aarch64_sbsaref',
> diff --git a/tests/functional/test_aarch64_aspeed.py b/tests/functional/test_aarch64_aspeed.py
> new file mode 100644
> index 000000000000..c61e34242d5a
> --- /dev/null
> +++ b/tests/functional/test_aarch64_aspeed.py
> @@ -0,0 +1,97 @@
> +#!/usr/bin/env python3
> +#
> +# Functional test that boots the ASPEED SoCs with firmware
> +#
> +# Copyright (C) 2022 ASPEED Technology Inc
> +#
> +# SPDX-License-Identifier: GPL-2.0-or-later
> +
> +import sys
> +import os
> +
> +from qemu_test import QemuSystemTest, Asset
> +from qemu_test import wait_for_console_pattern
> +from qemu_test import exec_command_and_wait_for_pattern
> +from qemu_test.utils import archive_extract
> +
> +class AST2x00MachineSDK(QemuSystemTest):
> +
> +    def do_test_aarch64_aspeed_sdk_start(self, image):
> +        self.vm.set_console()
> +        self.vm.add_args('-drive', 'file=' + image + ',if=mtd,format=raw',
> +                         '-net', 'nic', '-snapshot')

Running QEMU with just "-net nic" but no other "-net" option normally 
produces a warning à la "warning: hub 0 is not connected to host network" 
... it's likely hidden in a log file here, so it does not really matter, but 
in case you respin the series anyway, you could maybe also try without the 
"-net nic" here.

Anyway,
Reviewed-by: Thomas Huth <thuth@redhat.com>
Cédric Le Goater Nov. 12, 2024, 8:02 a.m. UTC | #2
On 11/12/24 07:53, Thomas Huth wrote:
> On 12/11/2024 07.28, Cédric Le Goater wrote:
>> Drop the SSH connection which was introduced in the avocado tests to
>> workaround read issues when interacting with console.
>>
>> Signed-off-by: Cédric Le Goater <clg@redhat.com>
>> ---
>>   tests/avocado/machine_aspeed.py         | 78 --------------------
>>   tests/functional/meson.build            |  2 +
>>   tests/functional/test_aarch64_aspeed.py | 97 +++++++++++++++++++++++++
>>   3 files changed, 99 insertions(+), 78 deletions(-)
>>   create mode 100644 tests/functional/test_aarch64_aspeed.py
>>
>> diff --git a/tests/avocado/machine_aspeed.py b/tests/avocado/machine_aspeed.py
>> index 241ef180affc..2240c82abff9 100644
>> --- a/tests/avocado/machine_aspeed.py
>> +++ b/tests/avocado/machine_aspeed.py
>> @@ -59,17 +59,6 @@ def do_test_arm_aspeed_sdk_start(self, image):
>>               self, 'boot', '## Loading kernel from FIT Image')
>>           self.wait_for_console_pattern('Starting kernel ...')
>> -    def do_test_aarch64_aspeed_sdk_start(self, image):
>> -        self.vm.set_console()
>> -        self.vm.add_args('-drive', 'file=' + image + ',if=mtd,format=raw',
>> -                         '-net', 'nic', '-net', 'user,hostfwd=:127.0.0.1:0-:22')
>> -
>> -        self.vm.launch()
>> -
>> -        self.wait_for_console_pattern('U-Boot 2023.10')
>> -        self.wait_for_console_pattern('## Loading kernel from FIT Image')
>> -        self.wait_for_console_pattern('Starting kernel ...')
>> -
>>       @skipUnless(os.getenv('QEMU_TEST_FLAKY_TESTS'), 'Test is unstable on GitLab')
>>       def test_arm_ast2500_evb_sdk(self):
>>           """
>> @@ -133,70 +122,3 @@ def test_arm_ast2600_evb_sdk(self):
>>           year = time.strftime("%Y")
>>           self.ssh_command_output_contains('/sbin/hwclock -f /dev/rtc1', year);
>> -    def test_aarch64_ast2700_evb_sdk_v09_02(self):
>> -        """
>> -        :avocado: tags=arch:aarch64
>> -        :avocado: tags=machine:ast2700-evb
>> -        """
>> -
>> -        image_url = ('https://github.com/AspeedTech-BMC/openbmc/releases/'
>> -                     'download/v09.02/ast2700-default-obmc.tar.gz')
>> -        image_hash = 'ac969c2602f4e6bdb69562ff466b89ae3fe1d86e1f6797bb7969d787f82116a7'
>> -        image_path = self.fetch_asset(image_url, asset_hash=image_hash,
>> -                                      algorithm='sha256')
>> -        archive.extract(image_path, self.workdir)
>> -
>> -        num_cpu = 4
>> -        image_dir = self.workdir + '/ast2700-default/'
>> -        uboot_size = os.path.getsize(image_dir + 'u-boot-nodtb.bin')
>> -        uboot_dtb_load_addr = hex(0x400000000 + uboot_size)
>> -
>> -        load_images_list = [
>> -            {
>> -                'addr': '0x400000000',
>> -                'file': image_dir + 'u-boot-nodtb.bin'
>> -            },
>> -            {
>> -                'addr': str(uboot_dtb_load_addr),
>> -                'file': image_dir + 'u-boot.dtb'
>> -            },
>> -            {
>> -                'addr': '0x430000000',
>> -                'file': image_dir + 'bl31.bin'
>> -            },
>> -            {
>> -                'addr': '0x430080000',
>> -                'file': image_dir + 'optee/tee-raw.bin'
>> -            }
>> -        ]
>> -
>> -        for load_image in load_images_list:
>> -            addr = load_image['addr']
>> -            file = load_image['file']
>> -            self.vm.add_args('-device',
>> -                             f'loader,force-raw=on,addr={addr},file={file}')
>> -
>> -        for i in range(num_cpu):
>> -            self.vm.add_args('-device',
>> -                             f'loader,addr=0x430000000,cpu-num={i}')
>> -
>> -        self.vm.add_args('-smp', str(num_cpu))
>> -        self.vm.add_args('-device',
>> -                         'tmp105,bus=aspeed.i2c.bus.1,address=0x4d,id=tmp-test')
>> -        self.do_test_aarch64_aspeed_sdk_start(image_dir + 'image-bmc')
>> -        self.wait_for_console_pattern('nodistro.0 ast2700-default ttyS12')
>> -
>> -        self.ssh_connect('root', '0penBmc', False)
>> -        self.ssh_command('dmesg -c > /dev/null')
>> -
>> -        self.ssh_command_output_contains(
>> -            'echo lm75 0x4d > /sys/class/i2c-dev/i2c-1/device/new_device '
>> -            '&& dmesg -c',
>> -            'i2c i2c-1: new_device: Instantiated device lm75 at 0x4d');
>> -
>> -        self.ssh_command_output_contains(
>> -            'cat /sys/class/hwmon/hwmon20/temp1_input', '0')
>> -        self.vm.cmd('qom-set', path='/machine/peripheral/tmp-test',
>> -                    property='temperature', value=18000)
>> -        self.ssh_command_output_contains(
>> -            'cat /sys/class/hwmon/hwmon20/temp1_input', '18000')
>> diff --git a/tests/functional/meson.build b/tests/functional/meson.build
>> index 758145d1e5fa..c035eba4f9b8 100644
>> --- a/tests/functional/meson.build
>> +++ b/tests/functional/meson.build
>> @@ -11,6 +11,7 @@ endif
>>   # Timeouts for individual tests that can be slow e.g. with debugging enabled
>>   test_timeouts = {
>> +  'aarch64_aspeed' : 600,
>>     'aarch64_raspi4' : 480,
>>     'aarch64_sbsaref_alpine' : 720,
>>     'aarch64_sbsaref_freebsd' : 720,
>> @@ -47,6 +48,7 @@ tests_generic_bsduser = [
>>   ]
>>   tests_aarch64_system_thorough = [
>> +  'aarch64_aspeed',
>>     'aarch64_raspi3',
>>     'aarch64_raspi4',
>>     'aarch64_sbsaref',
>> diff --git a/tests/functional/test_aarch64_aspeed.py b/tests/functional/test_aarch64_aspeed.py
>> new file mode 100644
>> index 000000000000..c61e34242d5a
>> --- /dev/null
>> +++ b/tests/functional/test_aarch64_aspeed.py
>> @@ -0,0 +1,97 @@
>> +#!/usr/bin/env python3
>> +#
>> +# Functional test that boots the ASPEED SoCs with firmware
>> +#
>> +# Copyright (C) 2022 ASPEED Technology Inc
>> +#
>> +# SPDX-License-Identifier: GPL-2.0-or-later
>> +
>> +import sys
>> +import os
>> +
>> +from qemu_test import QemuSystemTest, Asset
>> +from qemu_test import wait_for_console_pattern
>> +from qemu_test import exec_command_and_wait_for_pattern
>> +from qemu_test.utils import archive_extract
>> +
>> +class AST2x00MachineSDK(QemuSystemTest):
>> +
>> +    def do_test_aarch64_aspeed_sdk_start(self, image):
>> +        self.vm.set_console()
>> +        self.vm.add_args('-drive', 'file=' + image + ',if=mtd,format=raw',
>> +                         '-net', 'nic', '-snapshot')
> 
> Running QEMU with just "-net nic" but no other "-net" option normally produces a warning à la "warning: hub 0 is not connected to host network" ... it's likely hidden in a log file here, so it does not really matter, but in case you respin the series anyway, you could maybe also try without the "-net nic" here.


I will add a user netdev.




> Anyway,
> Reviewed-by: Thomas Huth <thuth@redhat.com>
> 


Thanks,

C.
diff mbox series

Patch

diff --git a/tests/avocado/machine_aspeed.py b/tests/avocado/machine_aspeed.py
index 241ef180affc..2240c82abff9 100644
--- a/tests/avocado/machine_aspeed.py
+++ b/tests/avocado/machine_aspeed.py
@@ -59,17 +59,6 @@  def do_test_arm_aspeed_sdk_start(self, image):
             self, 'boot', '## Loading kernel from FIT Image')
         self.wait_for_console_pattern('Starting kernel ...')
 
-    def do_test_aarch64_aspeed_sdk_start(self, image):
-        self.vm.set_console()
-        self.vm.add_args('-drive', 'file=' + image + ',if=mtd,format=raw',
-                         '-net', 'nic', '-net', 'user,hostfwd=:127.0.0.1:0-:22')
-
-        self.vm.launch()
-
-        self.wait_for_console_pattern('U-Boot 2023.10')
-        self.wait_for_console_pattern('## Loading kernel from FIT Image')
-        self.wait_for_console_pattern('Starting kernel ...')
-
     @skipUnless(os.getenv('QEMU_TEST_FLAKY_TESTS'), 'Test is unstable on GitLab')
     def test_arm_ast2500_evb_sdk(self):
         """
@@ -133,70 +122,3 @@  def test_arm_ast2600_evb_sdk(self):
         year = time.strftime("%Y")
         self.ssh_command_output_contains('/sbin/hwclock -f /dev/rtc1', year);
 
-    def test_aarch64_ast2700_evb_sdk_v09_02(self):
-        """
-        :avocado: tags=arch:aarch64
-        :avocado: tags=machine:ast2700-evb
-        """
-
-        image_url = ('https://github.com/AspeedTech-BMC/openbmc/releases/'
-                     'download/v09.02/ast2700-default-obmc.tar.gz')
-        image_hash = 'ac969c2602f4e6bdb69562ff466b89ae3fe1d86e1f6797bb7969d787f82116a7'
-        image_path = self.fetch_asset(image_url, asset_hash=image_hash,
-                                      algorithm='sha256')
-        archive.extract(image_path, self.workdir)
-
-        num_cpu = 4
-        image_dir = self.workdir + '/ast2700-default/'
-        uboot_size = os.path.getsize(image_dir + 'u-boot-nodtb.bin')
-        uboot_dtb_load_addr = hex(0x400000000 + uboot_size)
-
-        load_images_list = [
-            {
-                'addr': '0x400000000',
-                'file': image_dir + 'u-boot-nodtb.bin'
-            },
-            {
-                'addr': str(uboot_dtb_load_addr),
-                'file': image_dir + 'u-boot.dtb'
-            },
-            {
-                'addr': '0x430000000',
-                'file': image_dir + 'bl31.bin'
-            },
-            {
-                'addr': '0x430080000',
-                'file': image_dir + 'optee/tee-raw.bin'
-            }
-        ]
-
-        for load_image in load_images_list:
-            addr = load_image['addr']
-            file = load_image['file']
-            self.vm.add_args('-device',
-                             f'loader,force-raw=on,addr={addr},file={file}')
-
-        for i in range(num_cpu):
-            self.vm.add_args('-device',
-                             f'loader,addr=0x430000000,cpu-num={i}')
-
-        self.vm.add_args('-smp', str(num_cpu))
-        self.vm.add_args('-device',
-                         'tmp105,bus=aspeed.i2c.bus.1,address=0x4d,id=tmp-test')
-        self.do_test_aarch64_aspeed_sdk_start(image_dir + 'image-bmc')
-        self.wait_for_console_pattern('nodistro.0 ast2700-default ttyS12')
-
-        self.ssh_connect('root', '0penBmc', False)
-        self.ssh_command('dmesg -c > /dev/null')
-
-        self.ssh_command_output_contains(
-            'echo lm75 0x4d > /sys/class/i2c-dev/i2c-1/device/new_device '
-            '&& dmesg -c',
-            'i2c i2c-1: new_device: Instantiated device lm75 at 0x4d');
-
-        self.ssh_command_output_contains(
-            'cat /sys/class/hwmon/hwmon20/temp1_input', '0')
-        self.vm.cmd('qom-set', path='/machine/peripheral/tmp-test',
-                    property='temperature', value=18000)
-        self.ssh_command_output_contains(
-            'cat /sys/class/hwmon/hwmon20/temp1_input', '18000')
diff --git a/tests/functional/meson.build b/tests/functional/meson.build
index 758145d1e5fa..c035eba4f9b8 100644
--- a/tests/functional/meson.build
+++ b/tests/functional/meson.build
@@ -11,6 +11,7 @@  endif
 
 # Timeouts for individual tests that can be slow e.g. with debugging enabled
 test_timeouts = {
+  'aarch64_aspeed' : 600,
   'aarch64_raspi4' : 480,
   'aarch64_sbsaref_alpine' : 720,
   'aarch64_sbsaref_freebsd' : 720,
@@ -47,6 +48,7 @@  tests_generic_bsduser = [
 ]
 
 tests_aarch64_system_thorough = [
+  'aarch64_aspeed',
   'aarch64_raspi3',
   'aarch64_raspi4',
   'aarch64_sbsaref',
diff --git a/tests/functional/test_aarch64_aspeed.py b/tests/functional/test_aarch64_aspeed.py
new file mode 100644
index 000000000000..c61e34242d5a
--- /dev/null
+++ b/tests/functional/test_aarch64_aspeed.py
@@ -0,0 +1,97 @@ 
+#!/usr/bin/env python3
+#
+# Functional test that boots the ASPEED SoCs with firmware
+#
+# Copyright (C) 2022 ASPEED Technology Inc
+#
+# SPDX-License-Identifier: GPL-2.0-or-later
+
+import sys
+import os
+
+from qemu_test import QemuSystemTest, Asset
+from qemu_test import wait_for_console_pattern
+from qemu_test import exec_command_and_wait_for_pattern
+from qemu_test.utils import archive_extract
+
+class AST2x00MachineSDK(QemuSystemTest):
+
+    def do_test_aarch64_aspeed_sdk_start(self, image):
+        self.vm.set_console()
+        self.vm.add_args('-drive', 'file=' + image + ',if=mtd,format=raw',
+                         '-net', 'nic', '-snapshot')
+
+        self.vm.launch()
+
+        wait_for_console_pattern(self, 'U-Boot 2023.10')
+        wait_for_console_pattern(self, '## Loading kernel from FIT Image')
+        wait_for_console_pattern(self, 'Starting kernel ...')
+
+    ASSET_SDK_V902_AST2700 = Asset(
+            'https://github.com/AspeedTech-BMC/openbmc/releases/download/v09.02/ast2700-default-obmc.tar.gz',
+            'ac969c2602f4e6bdb69562ff466b89ae3fe1d86e1f6797bb7969d787f82116a7')
+
+    def test_aarch64_ast2700_evb_sdk_v09_02(self):
+        self.set_machine('ast2700-evb')
+
+        image_path = self.ASSET_SDK_V902_AST2700.fetch()
+        archive_extract(image_path, self.workdir)
+
+        num_cpu = 4
+        image_dir = self.workdir + '/ast2700-default/'
+        uboot_size = os.path.getsize(image_dir + 'u-boot-nodtb.bin')
+        uboot_dtb_load_addr = hex(0x400000000 + uboot_size)
+
+        load_images_list = [
+            {
+                'addr': '0x400000000',
+                'file': image_dir + 'u-boot-nodtb.bin'
+            },
+            {
+                'addr': str(uboot_dtb_load_addr),
+                'file': image_dir + 'u-boot.dtb'
+            },
+            {
+                'addr': '0x430000000',
+                'file': image_dir + 'bl31.bin'
+            },
+            {
+                'addr': '0x430080000',
+                'file': image_dir + 'optee/tee-raw.bin'
+            }
+        ]
+
+        for load_image in load_images_list:
+            addr = load_image['addr']
+            file = load_image['file']
+            self.vm.add_args('-device',
+                             f'loader,force-raw=on,addr={addr},file={file}')
+
+        for i in range(num_cpu):
+            self.vm.add_args('-device',
+                             f'loader,addr=0x430000000,cpu-num={i}')
+
+        self.vm.add_args('-smp', str(num_cpu))
+        self.vm.add_args('-device',
+                         'tmp105,bus=aspeed.i2c.bus.1,address=0x4d,id=tmp-test')
+        self.do_test_aarch64_aspeed_sdk_start(image_dir + 'image-bmc')
+
+        wait_for_console_pattern(self, 'ast2700-default login:')
+
+        exec_command_and_wait_for_pattern(self, 'root', 'Password:')
+        exec_command_and_wait_for_pattern(self,
+            '0penBmc', 'root@ast2700-default:~#')
+
+        exec_command_and_wait_for_pattern(self,
+            'echo lm75 0x4d > /sys/class/i2c-dev/i2c-1/device/new_device ',
+            'i2c i2c-1: new_device: Instantiated device lm75 at 0x4d');
+        exec_command_and_wait_for_pattern(self,
+            'cat /sys/class/hwmon/hwmon20/temp1_input', '0')
+        self.vm.cmd('qom-set', path='/machine/peripheral/tmp-test',
+                    property='temperature', value=18000)
+        exec_command_and_wait_for_pattern(self,
+            'cat /sys/class/hwmon/hwmon20/temp1_input', '18000')
+
+
+if __name__ == '__main__':
+    QemuSystemTest.main()