xiaomi-sm8450/android_kernel_xiaomi_sm8450
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Merge tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm

Procházet zdrojové kódy 
Pull KVM updates from Paolo Bonzini:
 "ARM:
   - HYP mode stub supports kexec/kdump on 32-bit
   - improved PMU support
   - virtual interrupt controller performance improvements
   - support for userspace virtual interrupt controller (slower, but
     necessary for KVM on the weird Broadcom SoCs used by the Raspberry
     Pi 3)

  MIPS:
   - basic support for hardware virtualization (ImgTec P5600/P6600/I6400
     and Cavium Octeon III)

  PPC:
   - in-kernel acceleration for VFIO

  s390:
   - support for guests without storage keys
   - adapter interruption suppression

  x86:
   - usual range of nVMX improvements, notably nested EPT support for
     accessed and dirty bits
   - emulation of CPL3 CPUID faulting

  generic:
   - first part of VCPU thread request API
   - kvm_stat improvements"

* tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm: (227 commits)
  kvm: nVMX: Don't validate disabled secondary controls
  KVM: put back #ifndef CONFIG_S390 around kvm_vcpu_kick
  Revert "KVM: Support vCPU-based gfn->hva cache"
  tools/kvm: fix top level makefile
  KVM: x86: don't hold kvm->lock in KVM_SET_GSI_ROUTING
  KVM: Documentation: remove VM mmap documentation
  kvm: nVMX: Remove superfluous VMX instruction fault checks
  KVM: x86: fix emulation of RSM and IRET instructions
  KVM: mark requests that need synchronization
  KVM: return if kvm_vcpu_wake_up() did wake up the VCPU
  KVM: add explicit barrier to kvm_vcpu_kick
  KVM: perform a wake_up in kvm_make_all_cpus_request
  KVM: mark requests that do not need a wakeup
  KVM: remove #ifndef CONFIG_S390 around kvm_vcpu_wake_up
  KVM: x86: always use kvm_make_request instead of set_bit
  KVM: add kvm_{test,clear}_request to replace {test,clear}_bit
  s390: kvm: Cpu model support for msa6, msa7 and msa8
  KVM: x86: remove irq disablement around KVM_SET_CLOCK/KVM_GET_CLOCK
  kvm: better MWAIT emulation for guests
  KVM: x86: virtualize cpuid faulting
  ...
Tento commit je obsažen v:
Linus Torvalds
2017-05-08 12:37:56 -07:00
rodič 9c6ee01ed5 2e5b0bd9cc
revize 2d3e4866de
150 změnil soubory, kde provedl 9181 přidání a 3835 odebrání
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5
tools/Makefile
Zobrazit soubor

@@ -86,10 +86,13 @@ tmon: FORCE
freefall: FORCE
$(call descend,laptop/$@)
kvm_stat: FORCE
$(call descend,kvm/$@)
all: acpi cgroup cpupower gpio hv firewire lguest \
perf selftests turbostat usb \
virtio vm net x86_energy_perf_policy \
tmon freefall objtool
tmon freefall objtool kvm_stat
acpi_install:
$(call descend,power/$(@:_install=),install)

3
tools/arch/s390/include/uapi/asm/kvm.h
Zobrazit soubor

@@ -131,7 +131,8 @@ struct kvm_s390_vm_cpu_subfunc {
__u8 kmo[16]; /* with MSA4 */
__u8 pcc[16]; /* with MSA4 */
__u8 ppno[16]; /* with MSA5 */
__u8 reserved[1824];
__u8 kma[16]; /* with MSA8 */
__u8 reserved[1808];
};
/* kvm attributes for crypto */

381
tools/kvm/kvm_stat/kvm_stat
Zobrazit soubor

@@ -30,8 +30,8 @@ import fcntl
import resource
import struct
import re
import subprocess
from collections import defaultdict
from time import sleep
VMX_EXIT_REASONS = {
'EXCEPTION_NMI': 0,
@@ -225,6 +225,7 @@ IOCTL_NUMBERS = {
'RESET': 0x00002403,
}
class Arch(object):
"""Encapsulates global architecture specific data.
@@ -255,12 +256,14 @@ class Arch(object):
return ArchX86(SVM_EXIT_REASONS)
return
class ArchX86(Arch):
def __init__(self, exit_reasons):
self.sc_perf_evt_open = 298
self.ioctl_numbers = IOCTL_NUMBERS
self.exit_reasons = exit_reasons
class ArchPPC(Arch):
def __init__(self):
self.sc_perf_evt_open = 319
@@ -275,12 +278,14 @@ class ArchPPC(Arch):
self.ioctl_numbers['SET_FILTER'] = 0x80002406 | char_ptr_size << 16
self.exit_reasons = {}
class ArchA64(Arch):
def __init__(self):
self.sc_perf_evt_open = 241
self.ioctl_numbers = IOCTL_NUMBERS
self.exit_reasons = AARCH64_EXIT_REASONS
class ArchS390(Arch):
def __init__(self):
self.sc_perf_evt_open = 331
@@ -316,6 +321,61 @@ def parse_int_list(list_string):
return integers
def get_pid_from_gname(gname):
"""Fuzzy function to convert guest name to QEMU process pid.
Returns a list of potential pids, can be empty if no match found.
Throws an exception on processing errors.
"""
pids = []
try:
child = subprocess.Popen(['ps', '-A', '--format', 'pid,args'],
stdout=subprocess.PIPE)
except:
raise Exception
for line in child.stdout:
line = line.lstrip().split(' ', 1)
# perform a sanity check before calling the more expensive
# function to possibly extract the guest name
if ' -name ' in line[1] and gname == get_gname_from_pid(line[0]):
pids.append(int(line[0]))
child.stdout.close()
return pids
def get_gname_from_pid(pid):
"""Returns the guest name for a QEMU process pid.
Extracts the guest name from the QEMU comma line by processing the '-name'
option. Will also handle names specified out of sequence.
"""
name = ''
try:
line = open('/proc/{}/cmdline'.format(pid), 'rb').read().split('\0')
parms = line[line.index('-name') + 1].split(',')
while '' in parms:
# commas are escaped (i.e. ',,'), hence e.g. 'foo,bar' results in
# ['foo', '', 'bar'], which we revert here
idx = parms.index('')
parms[idx - 1] += ',' + parms[idx + 1]
del parms[idx:idx+2]
# the '-name' switch allows for two ways to specify the guest name,
# where the plain name overrides the name specified via 'guest='
for arg in parms:
if '=' not in arg:
name = arg
break
if arg[:6] == 'guest=':
name = arg[6:]
except (ValueError, IOError, IndexError):
pass
return name
def get_online_cpus():
"""Returns a list of cpu id integers."""
with open('/sys/devices/system/cpu/online') as cpu_list:
@@ -342,6 +402,7 @@ def get_filters():
libc = ctypes.CDLL('libc.so.6', use_errno=True)
syscall = libc.syscall
class perf_event_attr(ctypes.Structure):
"""Struct that holds the necessary data to set up a trace event.
@@ -370,6 +431,7 @@ class perf_event_attr(ctypes.Structure):
self.size = ctypes.sizeof(self)
self.read_format = PERF_FORMAT_GROUP
def perf_event_open(attr, pid, cpu, group_fd, flags):
"""Wrapper for the sys_perf_evt_open() syscall.
@@ -395,6 +457,7 @@ PERF_FORMAT_GROUP = 1 << 3
PATH_DEBUGFS_TRACING = '/sys/kernel/debug/tracing'
PATH_DEBUGFS_KVM = '/sys/kernel/debug/kvm'
class Group(object):
"""Represents a perf event group."""
@@ -427,6 +490,7 @@ class Group(object):
struct.unpack(read_format,
os.read(self.events[0].fd, length))))
class Event(object):
"""Represents a performance event and manages its life cycle."""
def __init__(self, name, group, trace_cpu, trace_pid, trace_point,
@@ -510,6 +574,7 @@ class Event(object):
"""Resets the count of the trace event in the kernel."""
fcntl.ioctl(self.fd, ARCH.ioctl_numbers['RESET'], 0)
class TracepointProvider(object):
"""Data provider for the stats class.
@@ -551,6 +616,7 @@ class TracepointProvider(object):
def setup_traces(self):
"""Creates all event and group objects needed to be able to retrieve
data."""
fields = self.get_available_fields()
if self._pid > 0:
# Fetch list of all threads of the monitored pid, as qemu
# starts a thread for each vcpu.
@@ -561,7 +627,7 @@ class TracepointProvider(object):
# The constant is needed as a buffer for python libs, std
# streams and other files that the script opens.
newlim = len(groupids) * len(self._fields) + 50
newlim = len(groupids) * len(fields) + 50
try:
softlim_, hardlim = resource.getrlimit(resource.RLIMIT_NOFILE)
@@ -577,7 +643,7 @@ class TracepointProvider(object):
for groupid in groupids:
group = Group()
for name in self._fields:
for name in fields:
tracepoint = name
tracefilter = None
match = re.match(r'(.*)\((.*)\)', name)
@@ -650,13 +716,23 @@ class TracepointProvider(object):
ret[name] += val
return ret
def reset(self):
"""Reset all field counters"""
for group in self.group_leaders:
for event in group.events:
event.reset()
class DebugfsProvider(object):
"""Provides data from the files that KVM creates in the kvm debugfs
folder."""
def __init__(self):
self._fields = self.get_available_fields()
self._baseline = {}
self._pid = 0
self.do_read = True
self.paths = []
self.reset()
def get_available_fields(self):
""""Returns a list of available fields.
@@ -673,6 +749,7 @@ class DebugfsProvider(object):
@fields.setter
def fields(self, fields):
self._fields = fields
self.reset()
@property
def pid(self):
@@ -690,10 +767,11 @@ class DebugfsProvider(object):
self.paths = filter(lambda x: "{}-".format(pid) in x, vms)
else:
self.paths = ['']
self.paths = []
self.do_read = True
self.reset()
def read(self):
def read(self, reset=0):
"""Returns a dict with format:'file name / field -> current value'."""
results = {}
@@ -701,10 +779,22 @@ class DebugfsProvider(object):
if not self.do_read:
return results
for path in self.paths:
paths = self.paths
if self._pid == 0:
paths = []
for entry in os.walk(PATH_DEBUGFS_KVM):
for dir in entry[1]:
paths.append(dir)
for path in paths:
for field in self._fields:
results[field] = results.get(field, 0) \
+ self.read_field(field, path)
value = self.read_field(field, path)
key = path + field
if reset:
self._baseline[key] = value
if self._baseline.get(key, -1) == -1:
self._baseline[key] = value
results[field] = (results.get(field, 0) + value -
self._baseline.get(key, 0))
return results
@@ -718,6 +808,12 @@ class DebugfsProvider(object):
except IOError:
return 0
def reset(self):
"""Reset field counters"""
self._baseline = {}
self.read(1)
class Stats(object):
"""Manages the data providers and the data they provide.
@@ -753,14 +849,20 @@ class Stats(object):
for provider in self.providers:
provider.pid = self._pid_filter
def reset(self):
self.values = {}
for provider in self.providers:
provider.reset()
@property
def fields_filter(self):
return self._fields_filter
@fields_filter.setter
def fields_filter(self, fields_filter):
self._fields_filter = fields_filter
self.update_provider_filters()
if fields_filter != self._fields_filter:
self._fields_filter = fields_filter
self.update_provider_filters()
@property
def pid_filter(self):
@@ -768,9 +870,10 @@ class Stats(object):
@pid_filter.setter
def pid_filter(self, pid):
self._pid_filter = pid
self.values = {}
self.update_provider_pid()
if pid != self._pid_filter:
self._pid_filter = pid
self.values = {}
self.update_provider_pid()
def get(self):
"""Returns a dict with field -> (value, delta to last value) of all
@@ -778,23 +881,26 @@ class Stats(object):
for provider in self.providers:
new = provider.read()
for key in provider.fields:
oldval = self.values.get(key, (0, 0))
oldval = self.values.get(key, (0, 0))[0]
newval = new.get(key, 0)
newdelta = None
if oldval is not None:
newdelta = newval - oldval[0]
newdelta = newval - oldval
self.values[key] = (newval, newdelta)
return self.values
LABEL_WIDTH = 40
NUMBER_WIDTH = 10
DELAY_INITIAL = 0.25
DELAY_REGULAR = 3.0
MAX_GUEST_NAME_LEN = 48
MAX_REGEX_LEN = 44
DEFAULT_REGEX = r'^[^\(]*$'
class Tui(object):
"""Instruments curses to draw a nice text ui."""
def __init__(self, stats):
self.stats = stats
self.screen = None
self.drilldown = False
self.update_drilldown()
def __enter__(self):
@@ -809,7 +915,14 @@ class Tui(object):
# return from C start_color() is ignorable.
try:
curses.start_color()
except:
except curses.error:
pass
# Hide cursor in extra statement as some monochrome terminals
# might support hiding but not colors.
try:
curses.curs_set(0)
except curses.error:
pass
curses.use_default_colors()
@@ -827,36 +940,60 @@ class Tui(object):
def update_drilldown(self):
"""Sets or removes a filter that only allows fields without braces."""
if not self.stats.fields_filter:
self.stats.fields_filter = r'^[^\(]*$'
self.stats.fields_filter = DEFAULT_REGEX
elif self.stats.fields_filter == r'^[^\(]*$':
elif self.stats.fields_filter == DEFAULT_REGEX:
self.stats.fields_filter = None
def update_pid(self, pid):
"""Propagates pid selection to stats object."""
self.stats.pid_filter = pid
def refresh(self, sleeptime):
"""Refreshes on-screen data."""
def refresh_header(self, pid=None):
"""Refreshes the header."""
if pid is None:
pid = self.stats.pid_filter
self.screen.erase()
if self.stats.pid_filter > 0:
self.screen.addstr(0, 0, 'kvm statistics - pid {0}'
.format(self.stats.pid_filter),
curses.A_BOLD)
gname = get_gname_from_pid(pid)
if gname:
gname = ('({})'.format(gname[:MAX_GUEST_NAME_LEN] + '...'
if len(gname) > MAX_GUEST_NAME_LEN
else gname))
if pid > 0:
self.screen.addstr(0, 0, 'kvm statistics - pid {0} {1}'
.format(pid, gname), curses.A_BOLD)
else:
self.screen.addstr(0, 0, 'kvm statistics - summary', curses.A_BOLD)
if self.stats.fields_filter and self.stats.fields_filter \
!= DEFAULT_REGEX:
regex = self.stats.fields_filter
if len(regex) > MAX_REGEX_LEN:
regex = regex[:MAX_REGEX_LEN] + '...'
self.screen.addstr(1, 17, 'regex filter: {0}'.format(regex))
self.screen.addstr(2, 1, 'Event')
self.screen.addstr(2, 1 + LABEL_WIDTH + NUMBER_WIDTH -
len('Total'), 'Total')
self.screen.addstr(2, 1 + LABEL_WIDTH + NUMBER_WIDTH + 8 -
self.screen.addstr(2, 1 + LABEL_WIDTH + NUMBER_WIDTH + 7 -
len('%Total'), '%Total')
self.screen.addstr(2, 1 + LABEL_WIDTH + NUMBER_WIDTH + 7 + 8 -
len('Current'), 'Current')
self.screen.addstr(4, 1, 'Collecting data...')
self.screen.refresh()
def refresh_body(self, sleeptime):
row = 3
self.screen.move(row, 0)
self.screen.clrtobot()
stats = self.stats.get()
def sortkey(x):
if stats[x][1]:
return (-stats[x][1], -stats[x][0])
else:
return (0, -stats[x][0])
total = 0.
for val in stats.values():
total += val[0]
for key in sorted(stats.keys(), key=sortkey):
if row >= self.screen.getmaxyx()[0]:
@@ -869,6 +1006,8 @@ class Tui(object):
col += LABEL_WIDTH
self.screen.addstr(row, col, '%10d' % (values[0],))
col += NUMBER_WIDTH
self.screen.addstr(row, col, '%7.1f' % (values[0] * 100 / total,))
col += 7
if values[1] is not None:
self.screen.addstr(row, col, '%8d' % (values[1] / sleeptime,))
row += 1
@@ -893,20 +1032,24 @@ class Tui(object):
regex = self.screen.getstr()
curses.noecho()
if len(regex) == 0:
self.stats.fields_filter = DEFAULT_REGEX
self.refresh_header()
return
try:
re.compile(regex)
self.stats.fields_filter = regex
self.refresh_header()
return
except re.error:
continue
def show_vm_selection(self):
def show_vm_selection_by_pid(self):
"""Draws PID selection mask.
Asks for a pid until a valid pid or 0 has been entered.
"""
msg = ''
while True:
self.screen.erase()
self.screen.addstr(0, 0,
@@ -915,6 +1058,7 @@ class Tui(object):
self.screen.addstr(1, 0,
'This might limit the shown data to the trace '
'statistics.')
self.screen.addstr(5, 0, msg)
curses.echo()
self.screen.addstr(3, 0, "Pid [0 or pid]: ")
@@ -922,60 +1066,128 @@ class Tui(object):
curses.noecho()
try:
pid = int(pid)
if pid == 0:
self.update_pid(pid)
break
else:
if not os.path.isdir(os.path.join('/proc/', str(pid))):
if len(pid) > 0:
pid = int(pid)
if pid != 0 and not os.path.isdir(os.path.join('/proc/',
str(pid))):
msg = '"' + str(pid) + '": Not a running process'
continue
else:
self.update_pid(pid)
break
else:
pid = 0
self.refresh_header(pid)
self.update_pid(pid)
break
except ValueError:
msg = '"' + str(pid) + '": Not a valid pid'
continue
def show_vm_selection_by_guest_name(self):
"""Draws guest selection mask.
Asks for a guest name until a valid guest name or '' is entered.
"""
msg = ''
while True:
self.screen.erase()
self.screen.addstr(0, 0,
'Show statistics for specific guest.',
curses.A_BOLD)
self.screen.addstr(1, 0,
'This might limit the shown data to the trace '
'statistics.')
self.screen.addstr(5, 0, msg)
curses.echo()
self.screen.addstr(3, 0, "Guest [ENTER or guest]: ")
gname = self.screen.getstr()
curses.noecho()
if not gname:
self.refresh_header(0)
self.update_pid(0)
break
else:
pids = []
try:
pids = get_pid_from_gname(gname)
except:
msg = '"' + gname + '": Internal error while searching, ' \
'use pid filter instead'
continue
if len(pids) == 0:
msg = '"' + gname + '": Not an active guest'
continue
if len(pids) > 1:
msg = '"' + gname + '": Multiple matches found, use pid ' \
'filter instead'
continue
self.refresh_header(pids[0])
self.update_pid(pids[0])
break
def show_stats(self):
"""Refreshes the screen and processes user input."""
sleeptime = 0.25
sleeptime = DELAY_INITIAL
self.refresh_header()
while True:
self.refresh(sleeptime)
self.refresh_body(sleeptime)
curses.halfdelay(int(sleeptime * 10))
sleeptime = 3
sleeptime = DELAY_REGULAR
try:
char = self.screen.getkey()
if char == 'x':
self.drilldown = not self.drilldown
self.refresh_header()
self.update_drilldown()
sleeptime = DELAY_INITIAL
if char == 'q':
break
if char == 'c':
self.stats.fields_filter = DEFAULT_REGEX
self.refresh_header(0)
self.update_pid(0)
sleeptime = DELAY_INITIAL
if char == 'f':
self.show_filter_selection()
sleeptime = DELAY_INITIAL
if char == 'g':
self.show_vm_selection_by_guest_name()
sleeptime = DELAY_INITIAL
if char == 'p':
self.show_vm_selection()
self.show_vm_selection_by_pid()
sleeptime = DELAY_INITIAL
if char == 'r':
self.refresh_header()
self.stats.reset()
sleeptime = DELAY_INITIAL
except KeyboardInterrupt:
break
except curses.error:
continue
def batch(stats):
"""Prints statistics in a key, value format."""
s = stats.get()
time.sleep(1)
s = stats.get()
for key in sorted(s.keys()):
values = s[key]
print '%-42s%10d%10d' % (key, values[0], values[1])
try:
s = stats.get()
time.sleep(1)
s = stats.get()
for key in sorted(s.keys()):
values = s[key]
print '%-42s%10d%10d' % (key, values[0], values[1])
except KeyboardInterrupt:
pass
def log(stats):
"""Prints statistics as reiterating key block, multiple value blocks."""
keys = sorted(stats.get().iterkeys())
def banner():
for k in keys:
print '%s' % k,
print
def statline():
s = stats.get()
for k in keys:
@@ -984,11 +1196,15 @@ def log(stats):
line = 0
banner_repeat = 20
while True:
time.sleep(1)
if line % banner_repeat == 0:
banner()
statline()
line += 1
try:
time.sleep(1)
if line % banner_repeat == 0:
banner()
statline()
line += 1
except KeyboardInterrupt:
break
def get_options():
"""Returns processed program arguments."""
@@ -1009,6 +1225,16 @@ Requirements:
CAP_SYS_ADMIN and perf events are used.
- CAP_SYS_RESOURCE if the hard limit is not high enough to allow
the large number of files that are possibly opened.
Interactive Commands:
c clear filter
f filter by regular expression
g filter by guest name
p filter by PID
q quit
x toggle reporting of stats for individual child trace events
r reset stats
Press any other key to refresh statistics immediately.
"""
class PlainHelpFormatter(optparse.IndentedHelpFormatter):
@@ -1018,6 +1244,22 @@ Requirements:
else:
return ""
def cb_guest_to_pid(option, opt, val, parser):
try:
pids = get_pid_from_gname(val)
except:
raise optparse.OptionValueError('Error while searching for guest '
'"{}", use "-p" to specify a pid '
'instead'.format(val))
if len(pids) == 0:
raise optparse.OptionValueError('No guest by the name "{}" '
'found'.format(val))
if len(pids) > 1:
raise optparse.OptionValueError('Multiple processes found (pids: '
'{}) - use "-p" to specify a pid '
'instead'.format(" ".join(pids)))
parser.values.pid = pids[0]
optparser = optparse.OptionParser(description=description_text,
formatter=PlainHelpFormatter())
optparser.add_option('-1', '--once', '--batch',
@@ -1051,15 +1293,24 @@ Requirements:
help='fields to display (regex)',
)
optparser.add_option('-p', '--pid',
action='store',
default=0,
type=int,
dest='pid',
help='restrict statistics to pid',
)
action='store',
default=0,
type='int',
dest='pid',
help='restrict statistics to pid',
)
optparser.add_option('-g', '--guest',
action='callback',
type='string',
dest='pid',
metavar='GUEST',
help='restrict statistics to guest by name',
callback=cb_guest_to_pid,
)
(options, _) = optparser.parse_args(sys.argv)
return options
def get_providers(options):
"""Returns a list of data providers depending on the passed options."""
providers = []
@@ -1073,6 +1324,7 @@ def get_providers(options):
return providers
def check_access(options):
"""Exits if the current user can't access all needed directories."""
if not os.path.exists('/sys/kernel/debug'):
@@ -1086,8 +1338,8 @@ def check_access(options):
"Also ensure, that the kvm modules are loaded.\n")
sys.exit(1)
if not os.path.exists(PATH_DEBUGFS_TRACING) and (options.tracepoints
or not options.debugfs):
if not os.path.exists(PATH_DEBUGFS_TRACING) and (options.tracepoints or
not options.debugfs):
sys.stderr.write("Please enable CONFIG_TRACING in your kernel "
"when using the option -t (default).\n"
"If it is enabled, make {0} readable by the "
@@ -1098,10 +1350,11 @@ def check_access(options):
sys.stderr.write("Falling back to debugfs statistics!\n")
options.debugfs = True
sleep(5)
time.sleep(5)
return options
def main():
options = get_options()
options = check_access(options)

26
tools/kvm/kvm_stat/kvm_stat.txt
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@@ -18,11 +18,33 @@ state transitions such as guest mode entry and exit.
This tool is useful for observing guest behavior from the host perspective.
Often conclusions about performance or buggy behavior can be drawn from the
output.
While running in regular mode, use any of the keys listed in section
'Interactive Commands' below.
Use batch and logging modes for scripting purposes.
The set of KVM kernel module trace events may be specific to the kernel version
or architecture. It is best to check the KVM kernel module source code for the
meaning of events.
INTERACTIVE COMMANDS
--------------------
[horizontal]
*c*:: clear filter
*f*:: filter by regular expression
*g*:: filter by guest name
*p*:: filter by PID
*q*:: quit
*r*:: reset stats
*x*:: toggle reporting of stats for child trace events
Press any other key to refresh statistics immediately.
OPTIONS
-------
-1::
@@ -46,6 +68,10 @@ OPTIONS
--pid=<pid>::
limit statistics to one virtual machine (pid)
-g<guest>::
--guest=<guest_name>::
limit statistics to one virtual machine (guest name)
-f<fields>::
--fields=<fields>::
fields to display (regex)