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 = file('/dev/cpu/0/msr')
  31         except:
  32             self.f = file('/dev/msr0')
  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     Control(
 100         name = 'pin-based controls',
 101         bits = {
 102             0: 'External interrupt exiting',
 103             3: 'NMI exiting',
 104             5: 'Virtual NMIs',
 105             6: 'Activate VMX-preemption timer',
 106             },
 107         cap_msr = MSR_IA32_VMX_PINBASED_CTLS,
 108         true_cap_msr = MSR_IA32_VMX_TRUE_PINBASED_CTLS,
 109         ),
 110
 111     Control(
 112         name = 'primary processor-based controls',
 113         bits = {
 114             2: 'Interrupt window exiting',
 115             3: 'Use TSC offsetting',
 116             7: 'HLT exiting',
 117             9: 'INVLPG exiting',
 118             10: 'MWAIT exiting',
 119             11: 'RDPMC exiting',
 120             12: 'RDTSC exiting',
 121             15: 'CR3-load exiting',
 122             16: 'CR3-store exiting',
 123             19: 'CR8-load exiting',
 124             20: 'CR8-store exiting',
 125             21: 'Use TPR shadow',
 126             22: 'NMI-window exiting',
 127             23: 'MOV-DR exiting',
 128             24: 'Unconditional I/O exiting',
 129             25: 'Use I/O bitmaps',
 130             27: 'Monitor trap flag',
 131             28: 'Use MSR bitmaps',
 132             29: 'MONITOR exiting',
 133             30: 'PAUSE exiting',
 134             31: 'Activate secondary control',
 135             },
 136         cap_msr = MSR_IA32_VMX_PROCBASED_CTLS,
 137         true_cap_msr = MSR_IA32_VMX_TRUE_PROCBASED_CTLS,
 138         ),
 139
 140     Control(
 141         name = 'secondary processor-based controls',
 142         bits = {
 143             0: 'Virtualize APIC accesses',
 144             1: 'Enable EPT',
 145             2: 'Descriptor-table exiting',
 146             4: 'Virtualize x2APIC mode',
 147             5: 'Enable VPID',
 148             6: 'WBINVD exiting',
 149             7: 'Unrestricted guest',
 150             10: 'PAUSE-loop exiting',
 151             11: 'RDRAND exiting',
 152             12: 'Enable INVPCID',
 153             13: 'Enable VM functions',
 154             },
 155         cap_msr = MSR_IA32_VMX_PROCBASED_CTLS2,
 156         ),
 157
 158     Control(
 159         name = 'VM-Exit controls',
 160         bits = {
 161             2: 'Save debug controls',
 162             9: 'Host address-space size',
 163             12: 'Load IA32_PERF_GLOBAL_CTRL',
 164             15: 'Acknowledge interrupt on exit',
 165             18: 'Save IA32_PAT',
 166             19: 'Load IA32_PAT',
 167             20: 'Save IA32_EFER',
 168             21: 'Load IA32_EFER',
 169             22: 'Save VMX-preemption timer value',
 170             },
 171         cap_msr = MSR_IA32_VMX_EXIT_CTLS,
 172         true_cap_msr = MSR_IA32_VMX_TRUE_EXIT_CTLS,
 173         ),
 174
 175     Control(
 176         name = 'VM-Entry controls',
 177         bits = {
 178             2: 'Load debug controls',
 179             9: 'IA-64 mode guest',
 180             10: 'Entry to SMM',
 181             11: 'Deactivate dual-monitor treatment',
 182             13: 'Load IA32_PERF_GLOBAL_CTRL',
 183             14: 'Load IA32_PAT',
 184             15: 'Load IA32_EFER',
 185             },
 186         cap_msr = MSR_IA32_VMX_ENTRY_CTLS,
 187         true_cap_msr = MSR_IA32_VMX_TRUE_ENTRY_CTLS,
 188         ),
 189
 190     Misc(
 191         name = 'Miscellaneous data',
 192         bits = {
 193             (0,4): 'VMX-preemption timer scale (log2)',
 194             5: 'Store EFER.LMA into IA-32e mode guest control',
 195             6: 'HLT activity state',
 196             7: 'Shutdown activity state',
 197             8: 'Wait-for-SIPI activity state',
 198             (16,24): 'Number of CR3-target values',
 199             (25,27): 'MSR-load/store count recommenation',
 200             28: 'IA32_SMM_MONITOR_CTL[2] can be set to 1',
 201             (32,62): 'MSEG revision identifier',
 202             },
 203         msr = MSR_IA32_VMX_MISC_CTLS,
 204         ),
 205
 206     Misc(
 207         name = 'VPID and EPT capabilities',
 208         bits = {
 209             0: 'Execute-only EPT translations',
 210             6: 'Page-walk length 4',
 211             8: 'Paging-structure memory type UC',
 212             14: 'Paging-structure memory type WB',
 213             16: '2MB EPT pages',
 214             17: '1GB EPT pages',
 215             20: 'INVEPT supported',
 216             21: 'EPT accessed and dirty flags',
 217             25: 'Single-context INVEPT',
 218             26: 'All-context INVEPT',
 219             32: 'INVVPID supported',
 220             40: 'Individual-address INVVPID',
 221             41: 'Single-context INVVPID',
 222             42: 'All-context INVVPID',
 223             43: 'Single-context-retaining-globals INVVPID',
 224             },
 225         msr = MSR_IA32_VMX_EPT_VPID_CAP,
 226         ),
 227     Misc(
 228         name = 'VM Functions',
 229         bits = {
 230             0: 'EPTP Switching',
 231             },
 232         msr = MSR_IA32_VMX_VMFUNC,
 233         ),
 234     ]
 235
 236 for c in controls:
 237     c.show()