1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
|
#!/usr/bin/env python3
#
# virtio-balloon tests
#
# This work is licensed under the terms of the GNU GPL, version 2 or
# later. See the COPYING file in the top-level directory.
import time
from qemu_test import QemuSystemTest, Asset
from qemu_test import wait_for_console_pattern
from qemu_test import exec_command_and_wait_for_pattern
UNSET_STATS_VALUE = 18446744073709551615
class VirtioBalloonx86(QemuSystemTest):
ASSET_KERNEL = Asset(
('https://archives.fedoraproject.org/pub/archive/fedora/linux/releases'
'/31/Server/x86_64/os/images/pxeboot/vmlinuz'),
'd4738d03dbbe083ca610d0821d0a8f1488bebbdccef54ce33e3adb35fda00129')
ASSET_INITRD = Asset(
('https://archives.fedoraproject.org/pub/archive/fedora/linux/releases'
'/31/Server/x86_64/os/images/pxeboot/initrd.img'),
'277cd6c7adf77c7e63d73bbb2cded8ef9e2d3a2f100000e92ff1f8396513cd8b')
ASSET_DISKIMAGE = Asset(
('https://archives.fedoraproject.org/pub/archive/fedora/linux/releases'
'/31/Cloud/x86_64/images/Fedora-Cloud-Base-31-1.9.x86_64.qcow2'),
'e3c1b309d9203604922d6e255c2c5d098a309c2d46215d8fc026954f3c5c27a0')
DEFAULT_KERNEL_PARAMS = ('root=/dev/vda1 console=ttyS0 net.ifnames=0 '
'rd.rescue quiet')
def wait_for_console_pattern(self, success_message, vm=None):
wait_for_console_pattern(
self,
success_message,
failure_message="Kernel panic - not syncing",
vm=vm,
)
def mount_root(self):
self.wait_for_console_pattern('Entering emergency mode.')
prompt = '# '
self.wait_for_console_pattern(prompt)
# Synchronize on virtio-block driver creating the root device
exec_command_and_wait_for_pattern(self,
"while ! (dmesg -c | grep vda:) ; do sleep 1 ; done",
"vda1")
exec_command_and_wait_for_pattern(self, 'mount /dev/vda1 /sysroot',
prompt)
exec_command_and_wait_for_pattern(self, 'chroot /sysroot',
prompt)
exec_command_and_wait_for_pattern(self, "modprobe virtio-balloon",
prompt)
def assert_initial_stats(self):
ret = self.vm.qmp('qom-get',
{'path': '/machine/peripheral/balloon',
'property': 'guest-stats'})['return']
when = ret.get('last-update')
assert when == 0
stats = ret.get('stats')
for name, val in stats.items():
assert val == UNSET_STATS_VALUE
def assert_running_stats(self, then):
# We told the QEMU to refresh stats every 100ms, but
# there can be a delay between virtio-ballon driver
# being modprobed and seeing the first stats refresh
# Retry a few times for robustness under heavy load
retries = 10
when = 0
while when == 0 and retries:
ret = self.vm.qmp('qom-get',
{'path': '/machine/peripheral/balloon',
'property': 'guest-stats'})['return']
when = ret.get('last-update')
if when == 0:
retries = retries - 1
time.sleep(0.5)
now = time.time()
assert when > then and when < now
stats = ret.get('stats')
# Stat we expect this particular Kernel to have set
expectData = [
"stat-available-memory",
"stat-disk-caches",
"stat-free-memory",
"stat-htlb-pgalloc",
"stat-htlb-pgfail",
"stat-major-faults",
"stat-minor-faults",
"stat-swap-in",
"stat-swap-out",
"stat-total-memory",
]
for name, val in stats.items():
if name in expectData:
assert val != UNSET_STATS_VALUE
else:
assert val == UNSET_STATS_VALUE
def test_virtio_balloon_stats(self):
self.set_machine('q35')
self.require_accelerator("kvm")
kernel_path = self.ASSET_KERNEL.fetch()
initrd_path = self.ASSET_INITRD.fetch()
diskimage_path = self.ASSET_DISKIMAGE.fetch()
self.vm.set_console()
self.vm.add_args("-S")
self.vm.add_args("-cpu", "max")
self.vm.add_args("-m", "2G")
# Slow down BIOS phase with boot menu, so that after a system
# reset, we can reliably catch the clean stats again in BIOS
# phase before the guest OS launches
self.vm.add_args("-boot", "menu=on")
self.vm.add_args("-accel", "kvm")
self.vm.add_args("-device", "virtio-balloon,id=balloon")
self.vm.add_args('-drive',
f'file={diskimage_path},if=none,id=drv0,snapshot=on')
self.vm.add_args('-device', 'virtio-blk-pci,bus=pcie.0,' +
'drive=drv0,id=virtio-disk0,bootindex=1')
self.vm.add_args(
"-kernel",
kernel_path,
"-initrd",
initrd_path,
"-append",
self.DEFAULT_KERNEL_PARAMS
)
self.vm.launch()
# Poll stats at 100ms
self.vm.qmp('qom-set',
{'path': '/machine/peripheral/balloon',
'property': 'guest-stats-polling-interval',
'value': 100 })
# We've not run any guest code yet, neither BIOS or guest,
# so stats should be all default values
self.assert_initial_stats()
self.vm.qmp('cont')
then = time.time()
self.mount_root()
self.assert_running_stats(then)
# Race window between these two commands, where we
# rely on '-boot menu=on' to (hopefully) ensure we're
# still executing the BIOS when QEMU processes the
# 'stop', and thus have not loaded the virtio-balloon
# driver in the guest
self.vm.qmp('system_reset')
self.vm.qmp('stop')
# If the above assumption held, we're in BIOS now and
# stats should be all back at their default values
self.assert_initial_stats()
self.vm.qmp('cont')
then = time.time()
self.mount_root()
self.assert_running_stats(then)
if __name__ == '__main__':
QemuSystemTest.main()
|