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', 'rb', 0)
  31         except:
  32             self.f = open('/dev/msr0', 'rb', 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         mb1, cb1 = self.read2(self.cap_msr)
  54         tmb1, tcb1 = 0, 0
  55         if self.true_cap_msr:
  56             tmb1, tcb1 = self.read2(self.true_cap_msr)
  57         for bit in sorted(self.bits.keys()):
  58             zero = not (mb1 & (1 << bit))
  59             one = cb1 & (1 << bit)
  60             true_zero = not (tmb1 & (1 << bit))
  61             true_one = tcb1 & (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         print('  Hex: 0x%x' % (value))
  83         def first_bit(key):
  84             if type(key) is tuple:
  85                 return key[0]
  86             else:
  87                 return key
  88         for bits in sorted(self.bits.keys(), key = first_bit):
  89             if type(bits) is tuple:
  90                 lo, hi = bits
  91                 fmt = int
  92             else:
  93                 lo = hi = bits
  94                 def fmt(x):
  95                     return { True: 'yes', False: 'no' }[x]
  96             v = (value >> lo) & ((1 << (hi - lo + 1)) - 1)
  97             print('  %-40s %s' % (self.bits[bits], fmt(v)))
  98
  99 controls = [
 100     Misc(
 101         name = 'Basic VMX Information',
 102         bits = {
 103             (0, 30): 'Revision',
 104             (32,44): 'VMCS size',
 105             48: 'VMCS restricted to 32 bit addresses',
 106             49: 'Dual-monitor support',
 107             (50, 53): 'VMCS memory type',
 108             54: 'INS/OUTS instruction information',
 109             55: 'IA32_VMX_TRUE_*_CTLS support',
 110             },
 111         msr = MSR_IA32_VMX_BASIC,
 112         ),
 113     Control(
 114         name = 'pin-based controls',
 115         bits = {
 116             0: 'External interrupt exiting',
 117             3: 'NMI exiting',
 118             5: 'Virtual NMIs',
 119             6: 'Activate VMX-preemption timer',
 120             7: 'Process posted interrupts',
 121             },
 122         cap_msr = MSR_IA32_VMX_PINBASED_CTLS,
 123         true_cap_msr = MSR_IA32_VMX_TRUE_PINBASED_CTLS,
 124         ),
 125
 126     Control(
 127         name = 'primary processor-based controls',
 128         bits = {
 129             2: 'Interrupt window exiting',
 130             3: 'Use TSC offsetting',
 131             7: 'HLT exiting',
 132             9: 'INVLPG exiting',
 133             10: 'MWAIT exiting',
 134             11: 'RDPMC exiting',
 135             12: 'RDTSC exiting',
 136             15: 'CR3-load exiting',
 137             16: 'CR3-store exiting',
 138             19: 'CR8-load exiting',
 139             20: 'CR8-store exiting',
 140             21: 'Use TPR shadow',
 141             22: 'NMI-window exiting',
 142             23: 'MOV-DR exiting',
 143             24: 'Unconditional I/O exiting',
 144             25: 'Use I/O bitmaps',
 145             27: 'Monitor trap flag',
 146             28: 'Use MSR bitmaps',
 147             29: 'MONITOR exiting',
 148             30: 'PAUSE exiting',
 149             31: 'Activate secondary control',
 150             },
 151         cap_msr = MSR_IA32_VMX_PROCBASED_CTLS,
 152         true_cap_msr = MSR_IA32_VMX_TRUE_PROCBASED_CTLS,
 153         ),
 154
 155     Control(
 156         name = 'secondary processor-based controls',
 157         bits = {
 158             0: 'Virtualize APIC accesses',
 159             1: 'Enable EPT',
 160             2: 'Descriptor-table exiting',
 161             3: 'Enable RDTSCP',
 162             4: 'Virtualize x2APIC mode',
 163             5: 'Enable VPID',
 164             6: 'WBINVD exiting',
 165             7: 'Unrestricted guest',
 166             8: 'APIC register emulation',
 167             9: 'Virtual interrupt delivery',
 168             10: 'PAUSE-loop exiting',
 169             11: 'RDRAND exiting',
 170             12: 'Enable INVPCID',
 171             13: 'Enable VM functions',
 172             14: 'VMCS shadowing',
 173             15: 'Enable ENCLS exiting',
 174             16: 'RDSEED exiting',
 175             17: 'Enable PML',
 176             18: 'EPT-violation #VE',
 177             19: 'Conceal non-root operation from PT',
 178             20: 'Enable XSAVES/XRSTORS',
 179             22: 'Mode-based execute control (XS/XU)',
 180             23: 'Sub-page write permissions',
 181             24: 'GPA translation for PT',
 182             25: 'TSC scaling',
 183             26: 'User wait and pause',
 184             28: 'ENCLV exiting',
 185             },
 186         cap_msr = MSR_IA32_VMX_PROCBASED_CTLS2,
 187         ),
 188
 189     Control(
 190         name = 'VM-Exit controls',
 191         bits = {
 192             2: 'Save debug controls',
 193             9: 'Host address-space size',
 194             12: 'Load IA32_PERF_GLOBAL_CTRL',
 195             15: 'Acknowledge interrupt on exit',
 196             18: 'Save IA32_PAT',
 197             19: 'Load IA32_PAT',
 198             20: 'Save IA32_EFER',
 199             21: 'Load IA32_EFER',
 200             22: 'Save VMX-preemption timer value',
 201             23: 'Clear IA32_BNDCFGS',
 202             24: 'Conceal VM exits from PT',
 203             25: 'Clear IA32_RTIT_CTL',
 204             },
 205         cap_msr = MSR_IA32_VMX_EXIT_CTLS,
 206         true_cap_msr = MSR_IA32_VMX_TRUE_EXIT_CTLS,
 207         ),
 208
 209     Control(
 210         name = 'VM-Entry controls',
 211         bits = {
 212             2: 'Load debug controls',
 213             9: 'IA-32e mode guest',
 214             10: 'Entry to SMM',
 215             11: 'Deactivate dual-monitor treatment',
 216             13: 'Load IA32_PERF_GLOBAL_CTRL',
 217             14: 'Load IA32_PAT',
 218             15: 'Load IA32_EFER',
 219             16: 'Load IA32_BNDCFGS',
 220             17: 'Conceal VM entries from PT',
 221             18: 'Load IA32_RTIT_CTL',
 222             },
 223         cap_msr = MSR_IA32_VMX_ENTRY_CTLS,
 224         true_cap_msr = MSR_IA32_VMX_TRUE_ENTRY_CTLS,
 225         ),
 226
 227     Misc(
 228         name = 'Miscellaneous data',
 229         bits = {
 230             (0,4): 'VMX-preemption timer scale (log2)',
 231             5: 'Store EFER.LMA into IA-32e mode guest control',
 232             6: 'HLT activity state',
 233             7: 'Shutdown activity state',
 234             8: 'Wait-for-SIPI activity state',
 235             14: 'PT in VMX operation',
 236             15: 'IA32_SMBASE support',
 237             (16,24): 'Number of CR3-target values',
 238             (25,27): 'MSR-load/store count recommendation',
 239             28: 'IA32_SMM_MONITOR_CTL[2] can be set to 1',
 240             29: 'VMWRITE to VM-exit information fields',
 241             30: 'Inject event with insn length=0',
 242             (32,63): 'MSEG revision identifier',
 243             },
 244         msr = MSR_IA32_VMX_MISC_CTLS,
 245         ),
 246
 247     Misc(
 248         name = 'VPID and EPT capabilities',
 249         bits = {
 250             0: 'Execute-only EPT translations',
 251             6: 'Page-walk length 4',
 252             8: 'Paging-structure memory type UC',
 253             14: 'Paging-structure memory type WB',
 254             16: '2MB EPT pages',
 255             17: '1GB EPT pages',
 256             20: 'INVEPT supported',
 257             21: 'EPT accessed and dirty flags',
 258             22: 'Advanced VM-exit information for EPT violations',
 259             25: 'Single-context INVEPT',
 260             26: 'All-context INVEPT',
 261             32: 'INVVPID supported',
 262             40: 'Individual-address INVVPID',
 263             41: 'Single-context INVVPID',
 264             42: 'All-context INVVPID',
 265             43: 'Single-context-retaining-globals INVVPID',
 266             },
 267         msr = MSR_IA32_VMX_EPT_VPID_CAP,
 268         ),
 269     Misc(
 270         name = 'VM Functions',
 271         bits = {
 272             0: 'EPTP Switching',
 273             },
 274         msr = MSR_IA32_VMX_VMFUNC,
 275         ),
 276     ]
 277
 278 for c in controls:
 279     c.show()