scripts/kvm/vmxcap

   1 #!/usr/bin/python
   2 #
   3 # tool for querying VMX capabilities
   4 #
   5 # Copyright 2009-2010 Red Hat, Inc.
   6 #
   7 # Authors:
   8 #  Avi Kivity <avi@redhat.com>
   9 #
  10 # This work is licensed under the terms of the GNU GPL, version 2.  See
  11 # the COPYING file in the top-level directory.
  12
  13 MSR_IA32_VMX_BASIC = 0x480
  14 MSR_IA32_VMX_PINBASED_CTLS = 0x481
  15 MSR_IA32_VMX_PROCBASED_CTLS = 0x482
  16 MSR_IA32_VMX_EXIT_CTLS = 0x483
  17 MSR_IA32_VMX_ENTRY_CTLS = 0x484
  18 MSR_IA32_VMX_MISC_CTLS = 0x485
  19 MSR_IA32_VMX_PROCBASED_CTLS2 = 0x48B
  20 MSR_IA32_VMX_EPT_VPID_CAP = 0x48C
  21 MSR_IA32_VMX_TRUE_PINBASED_CTLS = 0x48D
  22 MSR_IA32_VMX_TRUE_PROCBASED_CTLS = 0x48E
  23 MSR_IA32_VMX_TRUE_EXIT_CTLS = 0x48F
  24 MSR_IA32_VMX_TRUE_ENTRY_CTLS = 0x490
  25 MSR_IA32_VMX_VMFUNC = 0x491
  26
  27 class msr(object):
  28     def __init__(self):
  29         try:
  30             self.f = open('/dev/cpu/0/msr', 'r', 0)
  31         except:
  32             self.f = open('/dev/msr0', 'r', 0)
  33     def read(self, index, default = None):
  34         import struct
  35         self.f.seek(index)
  36         try:
  37             return struct.unpack('Q', self.f.read(8))[0]
  38         except:
  39             return default
  40
  41 class Control(object):
  42     def __init__(self, name, bits, cap_msr, true_cap_msr = None):
  43         self.name = name
  44         self.bits = bits
  45         self.cap_msr = cap_msr
  46         self.true_cap_msr = true_cap_msr
  47     def read2(self, nr):
  48         m = msr()
  49         val = m.read(nr, 0)
  50         return (val & 0xffffffff, val >> 32)
  51     def show(self):
  52         print self.name
  53         mbz, mb1 = self.read2(self.cap_msr)
  54         tmbz, tmb1 = 0, 0
  55         if self.true_cap_msr:
  56             tmbz, tmb1 = self.read2(self.true_cap_msr)
  57         for bit in sorted(self.bits.keys()):
  58             zero = not (mbz & (1 << bit))
  59             one = mb1 & (1 << bit)
  60             true_zero = not (tmbz & (1 << bit))
  61             true_one = tmb1 & (1 << bit)
  62             s= '?'
  63             if (self.true_cap_msr and true_zero and true_one
  64                 and one and not zero):
  65                 s = 'default'
  66             elif zero and not one:
  67                 s = 'no'
  68             elif one and not zero:
  69                 s = 'forced'
  70             elif one and zero:
  71                 s = 'yes'
  72             print '  %-40s %s' % (self.bits[bit], s)
  73
  74 class Misc(object):
  75     def __init__(self, name, bits, msr):
  76         self.name = name
  77         self.bits = bits
  78         self.msr = msr
  79     def show(self):
  80         print self.name
  81         value = msr().read(self.msr, 0)
  82         def first_bit(key):
  83             if type(key) is tuple:
  84                 return key[0]
  85             else:
  86                 return key
  87         for bits in sorted(self.bits.keys(), key = first_bit):
  88             if type(bits) is tuple:
  89                 lo, hi = bits
  90                 fmt = int
  91             else:
  92                 lo = hi = bits
  93                 def fmt(x):
  94                     return { True: 'yes', False: 'no' }[x]
  95             v = (value >> lo) & ((1 << (hi - lo + 1)) - 1)
  96             print '  %-40s %s' % (self.bits[bits], fmt(v))
  97
  98 controls = [
  99     Misc(
 100         name = 'Basic VMX Information',
 101         bits = {
 102             (0, 31): 'Revision',
 103             (32,44): 'VMCS size',
 104             48: 'VMCS restricted to 32 bit addresses',
 105             49: 'Dual-monitor support',
 106             (50, 53): 'VMCS memory type',
 107             54: 'INS/OUTS instruction information',
 108             55: 'IA32_VMX_TRUE_*_CTLS support',
 109             },
 110         msr = MSR_IA32_VMX_BASIC,
 111         ),
 112     Control(
 113         name = 'pin-based controls',
 114         bits = {
 115             0: 'External interrupt exiting',
 116             3: 'NMI exiting',
 117             5: 'Virtual NMIs',
 118             6: 'Activate VMX-preemption timer',
 119             7: 'Process posted interrupts',
 120             },
 121         cap_msr = MSR_IA32_VMX_PINBASED_CTLS,
 122         true_cap_msr = MSR_IA32_VMX_TRUE_PINBASED_CTLS,
 123         ),
 124
 125     Control(
 126         name = 'primary processor-based controls',
 127         bits = {
 128             2: 'Interrupt window exiting',
 129             3: 'Use TSC offsetting',
 130             7: 'HLT exiting',
 131             9: 'INVLPG exiting',
 132             10: 'MWAIT exiting',
 133             11: 'RDPMC exiting',
 134             12: 'RDTSC exiting',
 135             15: 'CR3-load exiting',
 136             16: 'CR3-store exiting',
 137             19: 'CR8-load exiting',
 138             20: 'CR8-store exiting',
 139             21: 'Use TPR shadow',
 140             22: 'NMI-window exiting',
 141             23: 'MOV-DR exiting',
 142             24: 'Unconditional I/O exiting',
 143             25: 'Use I/O bitmaps',
 144             27: 'Monitor trap flag',
 145             28: 'Use MSR bitmaps',
 146             29: 'MONITOR exiting',
 147             30: 'PAUSE exiting',
 148             31: 'Activate secondary control',
 149             },
 150         cap_msr = MSR_IA32_VMX_PROCBASED_CTLS,
 151         true_cap_msr = MSR_IA32_VMX_TRUE_PROCBASED_CTLS,
 152         ),
 153
 154     Control(
 155         name = 'secondary processor-based controls',
 156         bits = {
 157             0: 'Virtualize APIC accesses',
 158             1: 'Enable EPT',
 159             2: 'Descriptor-table exiting',
 160             3: 'Enable RDTSCP',
 161             4: 'Virtualize x2APIC mode',
 162             5: 'Enable VPID',
 163             6: 'WBINVD exiting',
 164             7: 'Unrestricted guest',
 165             8: 'APIC register emulation',
 166             9: 'Virtual interrupt delivery',
 167             10: 'PAUSE-loop exiting',
 168             11: 'RDRAND exiting',
 169             12: 'Enable INVPCID',
 170             13: 'Enable VM functions',
 171             14: 'VMCS shadowing',
 172             18: 'EPT-violation #VE'
 173             },
 174         cap_msr = MSR_IA32_VMX_PROCBASED_CTLS2,
 175         ),
 176
 177     Control(
 178         name = 'VM-Exit controls',
 179         bits = {
 180             2: 'Save debug controls',
 181             9: 'Host address-space size',
 182             12: 'Load IA32_PERF_GLOBAL_CTRL',
 183             15: 'Acknowledge interrupt on exit',
 184             18: 'Save IA32_PAT',
 185             19: 'Load IA32_PAT',
 186             20: 'Save IA32_EFER',
 187             21: 'Load IA32_EFER',
 188             22: 'Save VMX-preemption timer value',
 189             },
 190         cap_msr = MSR_IA32_VMX_EXIT_CTLS,
 191         true_cap_msr = MSR_IA32_VMX_TRUE_EXIT_CTLS,
 192         ),
 193
 194     Control(
 195         name = 'VM-Entry controls',
 196         bits = {
 197             2: 'Load debug controls',
 198             9: 'IA-64 mode guest',
 199             10: 'Entry to SMM',
 200             11: 'Deactivate dual-monitor treatment',
 201             13: 'Load IA32_PERF_GLOBAL_CTRL',
 202             14: 'Load IA32_PAT',
 203             15: 'Load IA32_EFER',
 204             },
 205         cap_msr = MSR_IA32_VMX_ENTRY_CTLS,
 206         true_cap_msr = MSR_IA32_VMX_TRUE_ENTRY_CTLS,
 207         ),
 208
 209     Misc(
 210         name = 'Miscellaneous data',
 211         bits = {
 212             (0,4): 'VMX-preemption timer scale (log2)',
 213             5: 'Store EFER.LMA into IA-32e mode guest control',
 214             6: 'HLT activity state',
 215             7: 'Shutdown activity state',
 216             8: 'Wait-for-SIPI activity state',
 217             15: 'IA32_SMBASE support',
 218             (16,24): 'Number of CR3-target values',
 219             (25,27): 'MSR-load/store count recommenation',
 220             28: 'IA32_SMM_MONITOR_CTL[2] can be set to 1',
 221             29: 'VMWRITE to VM-exit information fields',
 222             (32,63): 'MSEG revision identifier',
 223             },
 224         msr = MSR_IA32_VMX_MISC_CTLS,
 225         ),
 226
 227     Misc(
 228         name = 'VPID and EPT capabilities',
 229         bits = {
 230             0: 'Execute-only EPT translations',
 231             6: 'Page-walk length 4',
 232             8: 'Paging-structure memory type UC',
 233             14: 'Paging-structure memory type WB',
 234             16: '2MB EPT pages',
 235             17: '1GB EPT pages',
 236             20: 'INVEPT supported',
 237             21: 'EPT accessed and dirty flags',
 238             25: 'Single-context INVEPT',
 239             26: 'All-context INVEPT',
 240             32: 'INVVPID supported',
 241             40: 'Individual-address INVVPID',
 242             41: 'Single-context INVVPID',
 243             42: 'All-context INVVPID',
 244             43: 'Single-context-retaining-globals INVVPID',
 245             },
 246         msr = MSR_IA32_VMX_EPT_VPID_CAP,
 247         ),
 248     Misc(
 249         name = 'VM Functions',
 250         bits = {
 251             0: 'EPTP Switching',
 252             },
 253         msr = MSR_IA32_VMX_VMFUNC,
 254         ),
 255     ]
 256
 257 for c in controls:
 258     c.show()