IBS_OP_CTL
wrmsr(IBS_OP_CTL, 0);
wrmsr(IBS_OP_CTL, config);
wrmsr(IBS_OP_CTL, config & ~IBS_OP_CTL_MAXCNTMASK);
wrmsr(IBS_OP_CTL, config);
wrmsr(IBS_OP_CTL, 0);
wrmsr(IBS_OP_CTL, pm->pm_md.pm_ibs.ibs_ctl | IBS_OP_CTL_ENABLE);
config = rdmsr(IBS_OP_CTL);
wrmsr(IBS_OP_CTL, 0);
*v = rdmsr(IBS_OP_CTL);