int kvm_get_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata)
{
	u64 data;

	switch (msr) {
	case MSR_IA32_PLATFORM_ID:
	case MSR_IA32_EBL_CR_POWERON:
	case MSR_IA32_DEBUGCTLMSR:
	case MSR_IA32_LASTBRANCHFROMIP:
	case MSR_IA32_LASTBRANCHTOIP:
	case MSR_IA32_LASTINTFROMIP:
	case MSR_IA32_LASTINTTOIP:
	case MSR_K8_SYSCFG:
	case MSR_K7_HWCR:
	case MSR_VM_HSAVE_PA:
	case MSR_K7_EVNTSEL0:
	case MSR_K7_PERFCTR0:
	case MSR_K8_INT_PENDING_MSG:
	case MSR_AMD64_NB_CFG:
	case MSR_FAM10H_MMIO_CONF_BASE:
	case MSR_AMD64_BU_CFG2:
		data = 0;
		break;
	case MSR_P6_PERFCTR0:
	case MSR_P6_PERFCTR1:
	case MSR_P6_EVNTSEL0:
	case MSR_P6_EVNTSEL1:
		if (kvm_pmu_msr(vcpu, msr))
			return kvm_pmu_get_msr(vcpu, msr, pdata);
		data = 0;
		break;
	case MSR_IA32_UCODE_REV:
		data = 0x100000000ULL;
		break;
	case MSR_MTRRcap:
		data = 0x500 | KVM_NR_VAR_MTRR;
		break;
	case 0x200 ... 0x2ff:
		return get_msr_mtrr(vcpu, msr, pdata);
	case 0xcd: /* fsb frequency */
		data = 3;
		break;
		/*
		 * MSR_EBC_FREQUENCY_ID
		 * Conservative value valid for even the basic CPU models.
		 * Models 0,1: 000 in bits 23:21 indicating a bus speed of
		 * 100MHz, model 2 000 in bits 18:16 indicating 100MHz,
		 * and 266MHz for model 3, or 4. Set Core Clock
		 * Frequency to System Bus Frequency Ratio to 1 (bits
		 * 31:24) even though these are only valid for CPU
		 * models > 2, however guests may end up dividing or
		 * multiplying by zero otherwise.
		 */
	case MSR_EBC_FREQUENCY_ID:
		data = 1 << 24;
		break;
	case MSR_IA32_APICBASE:
		data = kvm_get_apic_base(vcpu);
		break;
	case APIC_BASE_MSR ... APIC_BASE_MSR + 0x3ff:
		return kvm_x2apic_msr_read(vcpu, msr, pdata);
		break;
	case MSR_IA32_TSCDEADLINE:
		data = kvm_get_lapic_tscdeadline_msr(vcpu);
		break;
	case MSR_IA32_TSC_ADJUST:
		data = (u64)vcpu->arch.ia32_tsc_adjust_msr;
		break;
	case MSR_IA32_MISC_ENABLE:
		data = vcpu->arch.ia32_misc_enable_msr;
		break;
	case MSR_IA32_PERF_STATUS:
		/* TSC increment by tick */
		data = 1000ULL;
		/* CPU multiplier */
		data |= (((uint64_t)4ULL) << 40);
		break;
	case MSR_EFER:
		data = vcpu->arch.efer;
		break;
	case MSR_KVM_WALL_CLOCK:
	case MSR_KVM_WALL_CLOCK_NEW:
		data = vcpu->kvm->arch.wall_clock;
		break;
	case MSR_KVM_SYSTEM_TIME:
	case MSR_KVM_SYSTEM_TIME_NEW:
		data = vcpu->arch.time;
		break;
	case MSR_KVM_ASYNC_PF_EN:
		data = vcpu->arch.apf.msr_val;
		break;
	case MSR_KVM_STEAL_TIME:
		data = vcpu->arch.st.msr_val;
		break;
	case MSR_KVM_PV_EOI_EN:
		data = vcpu->arch.pv_eoi.msr_val;
		break;
	case MSR_IA32_P5_MC_ADDR:
	case MSR_IA32_P5_MC_TYPE:
	case MSR_IA32_MCG_CAP:
	case MSR_IA32_MCG_CTL:
	case MSR_IA32_MCG_STATUS:
	case MSR_IA32_MC0_CTL ... MSR_IA32_MC0_CTL + 4 * KVM_MAX_MCE_BANKS - 1:
		return get_msr_mce(vcpu, msr, pdata);
	case MSR_K7_CLK_CTL:
		/*
		 * Provide expected ramp-up count for K7. All other
		 * are set to zero, indicating minimum divisors for
		 * every field.
		 *
		 * This prevents guest kernels on AMD host with CPU
		 * type 6, model 8 and higher from exploding due to
		 * the rdmsr failing.
		 */
		data = 0x20000000;
		break;
	case HV_X64_MSR_GUEST_OS_ID ... HV_X64_MSR_SINT15:
		if (kvm_hv_msr_partition_wide(msr)) {
			int r;
			mutex_lock(&vcpu->kvm->lock);
			r = get_msr_hyperv_pw(vcpu, msr, pdata);
			mutex_unlock(&vcpu->kvm->lock);
			return r;
		} else
			return get_msr_hyperv(vcpu, msr, pdata);
		break;
	case MSR_IA32_BBL_CR_CTL3:
		/* This legacy MSR exists but isn't fully documented in current
		 * silicon.  It is however accessed by winxp in very narrow
		 * scenarios where it sets bit #19, itself documented as
		 * a "reserved" bit.  Best effort attempt to source coherent
		 * read data here should the balance of the register be
		 * interpreted by the guest:
		 *
		 * L2 cache control register 3: 64GB range, 256KB size,
		 * enabled, latency 0x1, configured
		 */
		data = 0xbe702111;
		break;
	case MSR_AMD64_OSVW_ID_LENGTH:
		if (!guest_cpuid_has_osvw(vcpu))
			return 1;
		data = vcpu->arch.osvw.length;
		break;
	case MSR_AMD64_OSVW_STATUS:
		if (!guest_cpuid_has_osvw(vcpu))
			return 1;
		data = vcpu->arch.osvw.status;
		break;
	default:
		if (kvm_pmu_msr(vcpu, msr))
			return kvm_pmu_get_msr(vcpu, msr, pdata);
		if (!ignore_msrs) {
			vcpu_unimpl(vcpu, "unhandled rdmsr: 0x%x\n", msr);
			return 1;
		} else {
			vcpu_unimpl(vcpu, "ignored rdmsr: 0x%x\n", msr);
			data = 0;
		}
		break;
	}
	*pdata = data;
	return 0;
}