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qemu-patch-raspberry4/scripts/kvm/vmxcap
Jan Kiszka f505a4d74a vmxcap: Open MSR file in unbuffered mode 
Python may otherwise decide to to read larger chunks, applying the seek
only on the software buffer. This will return results from the wrong
MSRs.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Gleb Natapov <gleb@redhat.com>
2013-04-17 23:27:23 -03:00

239 lines
7.3 KiB
Python
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#!/usr/bin/python
#
# tool for querying VMX capabilities
#
# Copyright 2009-2010 Red Hat, Inc.
#
# Authors:
# Avi Kivity <avi@redhat.com>
#
# This work is licensed under the terms of the GNU GPL, version 2. See
# the COPYING file in the top-level directory.
MSR_IA32_VMX_BASIC = 0x480
MSR_IA32_VMX_PINBASED_CTLS = 0x481
MSR_IA32_VMX_PROCBASED_CTLS = 0x482
MSR_IA32_VMX_EXIT_CTLS = 0x483
MSR_IA32_VMX_ENTRY_CTLS = 0x484
MSR_IA32_VMX_MISC_CTLS = 0x485
MSR_IA32_VMX_PROCBASED_CTLS2 = 0x48B
MSR_IA32_VMX_EPT_VPID_CAP = 0x48C
MSR_IA32_VMX_TRUE_PINBASED_CTLS = 0x48D
MSR_IA32_VMX_TRUE_PROCBASED_CTLS = 0x48E
MSR_IA32_VMX_TRUE_EXIT_CTLS = 0x48F
MSR_IA32_VMX_TRUE_ENTRY_CTLS = 0x490
MSR_IA32_VMX_VMFUNC = 0x491
class msr(object):
def __init__(self):
try:
self.f = open('/dev/cpu/0/msr', 'r', 0)
except:
self.f = open('/dev/msr0', 'r', 0)
def read(self, index, default = None):
import struct
self.f.seek(index)
try:
return struct.unpack('Q', self.f.read(8))[0]
except:
return default
class Control(object):
def __init__(self, name, bits, cap_msr, true_cap_msr = None):
self.name = name
self.bits = bits
self.cap_msr = cap_msr
self.true_cap_msr = true_cap_msr
def read2(self, nr):
m = msr()
val = m.read(nr, 0)
return (val & 0xffffffff, val >> 32)
def show(self):
print self.name
mbz, mb1 = self.read2(self.cap_msr)
tmbz, tmb1 = 0, 0
if self.true_cap_msr:
tmbz, tmb1 = self.read2(self.true_cap_msr)
for bit in sorted(self.bits.keys()):
zero = not (mbz & (1 << bit))
one = mb1 & (1 << bit)
true_zero = not (tmbz & (1 << bit))
true_one = tmb1 & (1 << bit)
s= '?'
if (self.true_cap_msr and true_zero and true_one
and one and not zero):
s = 'default'
elif zero and not one:
s = 'no'
elif one and not zero:
s = 'forced'
elif one and zero:
s = 'yes'
print ' %-40s %s' % (self.bits[bit], s)
class Misc(object):
def __init__(self, name, bits, msr):
self.name = name
self.bits = bits
self.msr = msr
def show(self):
print self.name
value = msr().read(self.msr, 0)
def first_bit(key):
if type(key) is tuple:
return key[0]
else:
return key
for bits in sorted(self.bits.keys(), key = first_bit):
if type(bits) is tuple:
lo, hi = bits
fmt = int
else:
lo = hi = bits
def fmt(x):
return { True: 'yes', False: 'no' }[x]
v = (value >> lo) & ((1 << (hi - lo + 1)) - 1)
print ' %-40s %s' % (self.bits[bits], fmt(v))
controls = [
Control(
name = 'pin-based controls',
bits = {
0: 'External interrupt exiting',
3: 'NMI exiting',
5: 'Virtual NMIs',
6: 'Activate VMX-preemption timer',
},
cap_msr = MSR_IA32_VMX_PINBASED_CTLS,
true_cap_msr = MSR_IA32_VMX_TRUE_PINBASED_CTLS,
),
Control(
name = 'primary processor-based controls',
bits = {
2: 'Interrupt window exiting',
3: 'Use TSC offsetting',
7: 'HLT exiting',
9: 'INVLPG exiting',
10: 'MWAIT exiting',
11: 'RDPMC exiting',
12: 'RDTSC exiting',
15: 'CR3-load exiting',
16: 'CR3-store exiting',
19: 'CR8-load exiting',
20: 'CR8-store exiting',
21: 'Use TPR shadow',
22: 'NMI-window exiting',
23: 'MOV-DR exiting',
24: 'Unconditional I/O exiting',
25: 'Use I/O bitmaps',
27: 'Monitor trap flag',
28: 'Use MSR bitmaps',
29: 'MONITOR exiting',
30: 'PAUSE exiting',
31: 'Activate secondary control',
},
cap_msr = MSR_IA32_VMX_PROCBASED_CTLS,
true_cap_msr = MSR_IA32_VMX_TRUE_PROCBASED_CTLS,
),
Control(
name = 'secondary processor-based controls',
bits = {
0: 'Virtualize APIC accesses',
1: 'Enable EPT',
2: 'Descriptor-table exiting',
4: 'Virtualize x2APIC mode',
5: 'Enable VPID',
6: 'WBINVD exiting',
7: 'Unrestricted guest',
9: 'Virtual interrupt delivery',
10: 'PAUSE-loop exiting',
11: 'RDRAND exiting',
12: 'Enable INVPCID',
13: 'Enable VM functions',
},
cap_msr = MSR_IA32_VMX_PROCBASED_CTLS2,
),
Control(
name = 'VM-Exit controls',
bits = {
2: 'Save debug controls',
9: 'Host address-space size',
12: 'Load IA32_PERF_GLOBAL_CTRL',
15: 'Acknowledge interrupt on exit',
18: 'Save IA32_PAT',
19: 'Load IA32_PAT',
20: 'Save IA32_EFER',
21: 'Load IA32_EFER',
22: 'Save VMX-preemption timer value',
},
cap_msr = MSR_IA32_VMX_EXIT_CTLS,
true_cap_msr = MSR_IA32_VMX_TRUE_EXIT_CTLS,
),
Control(
name = 'VM-Entry controls',
bits = {
2: 'Load debug controls',
9: 'IA-64 mode guest',
10: 'Entry to SMM',
11: 'Deactivate dual-monitor treatment',
13: 'Load IA32_PERF_GLOBAL_CTRL',
14: 'Load IA32_PAT',
15: 'Load IA32_EFER',
},
cap_msr = MSR_IA32_VMX_ENTRY_CTLS,
true_cap_msr = MSR_IA32_VMX_TRUE_ENTRY_CTLS,
),
Misc(
name = 'Miscellaneous data',
bits = {
(0,4): 'VMX-preemption timer scale (log2)',
5: 'Store EFER.LMA into IA-32e mode guest control',
6: 'HLT activity state',
7: 'Shutdown activity state',
8: 'Wait-for-SIPI activity state',
(16,24): 'Number of CR3-target values',
(25,27): 'MSR-load/store count recommenation',
28: 'IA32_SMM_MONITOR_CTL[2] can be set to 1',
(32,62): 'MSEG revision identifier',
},
msr = MSR_IA32_VMX_MISC_CTLS,
),
Misc(
name = 'VPID and EPT capabilities',
bits = {
0: 'Execute-only EPT translations',
6: 'Page-walk length 4',
8: 'Paging-structure memory type UC',
14: 'Paging-structure memory type WB',
16: '2MB EPT pages',
17: '1GB EPT pages',
20: 'INVEPT supported',
21: 'EPT accessed and dirty flags',
25: 'Single-context INVEPT',
26: 'All-context INVEPT',
32: 'INVVPID supported',
40: 'Individual-address INVVPID',
41: 'Single-context INVVPID',
42: 'All-context INVVPID',
43: 'Single-context-retaining-globals INVVPID',
},
msr = MSR_IA32_VMX_EPT_VPID_CAP,
),
Misc(
name = 'VM Functions',
bits = {
0: 'EPTP Switching',
},
msr = MSR_IA32_VMX_VMFUNC,
),
]
for c in controls:
c.show()
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