Attachment 704423 Details for Bug 916589 – msr.py

msr.py

msr.py (text/plain), 1.39 KB, created by Alon Bar-Lev on 2013-03-02 07:10:25 UTC

(hide)

Description:

Filename:

MIME Type:

Creator: Alon Bar-Lev

Created: 2013-03-02 07:10:25 UTC

Size: 1.39 KB

patch

obsolete

>#!/usr/bin/python
>
>import os
>import struct
>import traceback
>
>class test(object):
>    def _prdmsr(self, cpu, index):
>        ret = -1
>
>        msr = '/dev/cpu/%d/msr' % cpu
>        if not os.path.exists(msr):
>            raise AttributeError('No %s' % msr)
>        with open(msr, 'r') as f:
>            try:
>                f.seek(index)
>                ret = struct.unpack('L', f.read(8))[0]
>            except struct.error:
>                pass
>
>        print('prdmsr: %s' % ret)
>        return ret
>
>    def _vmx_enabled_by_bios(self):
>        MSR_IA32_FEATURE_CONTROL = 0x3a
>        MSR_IA32_FEATURE_CONTROL_LOCKED = 0x1
>        MSR_IA32_FEATURE_CONTROL_VMXON_ENABLED = 0x4
>
>        msr = self._prdmsr(0, MSR_IA32_FEATURE_CONTROL)
>        ret = (
>            msr & (
>                MSR_IA32_FEATURE_CONTROL_LOCKED |
>                MSR_IA32_FEATURE_CONTROL_VMXON_ENABLED
>            )
>        ) != MSR_IA32_FEATURE_CONTROL_LOCKED
>
>        print('vmx bios: %s' % ret)
>        return ret
>
>    def _svm_enabled_by_bios(self):
>        SVM_VM_CR_SVM_DISABLE = 4
>        MSR_VM_CR = 0xc0010114
>
>        vm_cr = self._prdmsr(0, MSR_VM_CR)
>        ret = (vm_cr & (1 << SVM_VM_CR_SVM_DISABLE)) == 0
>        print('svm bios: %s' % ret)
>        return ret
>
>t = test()
>print('vmx')
>try:
>    t._vmx_enabled_by_bios()
>except:
>    traceback.print_exc()
>print('svm')
>try:
>    t._svm_enabled_by_bios()
>except:
>    traceback.print_exc()

Actions: View

Attachments on bug 916589: 703888 | 703889 | 703901 | 704423