int virHostValidateQEMU(void)
{
    virBitmapPtr flags;
    int ret = 0;
    bool hasHwVirt = false;

    virHostMsgCheck("QEMU", "%s", _("for hardware virtualization"));

    if (!(flags = virHostValidateGetCPUFlags()))
        return -1;

    switch (virArchFromHost()) {
    case VIR_ARCH_I686:
    case VIR_ARCH_X86_64:
        if (virBitmapIsBitSet(flags, VIR_HOST_VALIDATE_CPU_FLAG_SVM) ||
            virBitmapIsBitSet(flags, VIR_HOST_VALIDATE_CPU_FLAG_VMX))
            hasHwVirt = true;
        break;
    case VIR_ARCH_S390:
    case VIR_ARCH_S390X:
        if (virBitmapIsBitSet(flags, VIR_HOST_VALIDATE_CPU_FLAG_SIE))
            hasHwVirt = true;
        break;
    default:
        hasHwVirt = false;
    }

    if (hasHwVirt) {
        virHostMsgPass();
        if (virHostValidateDeviceExists("QEMU", "/dev/kvm",
                                        VIR_HOST_VALIDATE_FAIL,
                                        _("Check that the 'kvm-intel' or 'kvm-amd' modules are "
                                          "loaded & the BIOS has enabled virtualization")) < 0)
            ret = -1;
        else if (virHostValidateDeviceAccessible("QEMU", "/dev/kvm",
                                                 VIR_HOST_VALIDATE_FAIL,
                                                 _("Check /dev/kvm is world writable or you are in "
                                                   "a group that is allowed to access it")) < 0)
            ret = -1;
    } else {
        virHostMsgFail(VIR_HOST_VALIDATE_WARN,
                       _("Only emulated CPUs are available, performance will be significantly limited"));
    }

    virBitmapFree(flags);

    if (virHostValidateDeviceExists("QEMU", "/dev/vhost-net",
                                    VIR_HOST_VALIDATE_WARN,
                                    _("Load the 'vhost_net' module to improve performance "
                                      "of virtio networking")) < 0)
        ret = -1;

    if (virHostValidateDeviceExists("QEMU", "/dev/net/tun",
                                    VIR_HOST_VALIDATE_FAIL,
                                    _("Load the 'tun' module to enable networking for QEMU guests")) < 0)
        ret = -1;

    if (virHostValidateCGroupController("QEMU", "memory",
                                        VIR_HOST_VALIDATE_WARN,
                                        "MEMCG") < 0)
        ret = -1;

    if (virHostValidateCGroupController("QEMU", "cpu",
                                        VIR_HOST_VALIDATE_WARN,
                                        "CGROUP_CPU") < 0)
        ret = -1;

    if (virHostValidateCGroupController("QEMU", "cpuacct",
                                        VIR_HOST_VALIDATE_WARN,
                                        "CGROUP_CPUACCT") < 0)
        ret = -1;

    if (virHostValidateCGroupController("QEMU", "cpuset",
                                        VIR_HOST_VALIDATE_WARN,
                                        "CPUSETS") < 0)
        ret = -1;

    if (virHostValidateCGroupController("QEMU", "devices",
                                        VIR_HOST_VALIDATE_WARN,
                                        "CGROUP_DEVICES") < 0)
        ret = -1;

    if (virHostValidateCGroupController("QEMU", "blkio",
                                        VIR_HOST_VALIDATE_WARN,
                                        "BLK_CGROUP") < 0)
        ret = -1;

    if (virHostValidateIOMMU("QEMU",
                             VIR_HOST_VALIDATE_WARN) < 0)
        ret = -1;

    return ret;
}
int virHostValidateQEMU(void)
{
    int ret = 0;

    virHostMsgCheck("QEMU", "%s", ("for hardware virtualization"));
    if (virHostValidateHasCPUFlag("svm") ||
        virHostValidateHasCPUFlag("vmx")) {
        virHostMsgPass();
        if (virHostValidateDeviceExists("QEMU", "/dev/kvm",
                                        VIR_HOST_VALIDATE_FAIL,
                                        _("Check that the 'kvm-intel' or 'kvm-amd' modules are "
                                          "loaded & the BIOS has enabled virtualization")) < 0)
            ret = -1;
        else if (virHostValidateDeviceAccessible("QEMU", "/dev/kvm",
                                                 VIR_HOST_VALIDATE_FAIL,
                                                 _("Check /dev/kvm is world writable or you are in "
                                                   "a group that is allowed to access it")) < 0)
            ret = -1;
    } else {
        virHostMsgFail(VIR_HOST_VALIDATE_WARN,
                       _("Only emulated CPUs are available, performance will be significantly limited"));
    }

    if (virHostValidateDeviceExists("QEMU", "/dev/vhost-net",
                                    VIR_HOST_VALIDATE_WARN,
                                    _("Load the 'vhost_net' module to improve performance "
                                      "of virtio networking")) < 0)
        ret = -1;

    if (virHostValidateDeviceExists("QEMU", "/dev/net/tun",
                                    VIR_HOST_VALIDATE_FAIL,
                                    _("Load the 'tun' module to enable networking for QEMU guests")) < 0)
        ret = -1;

    if (virHostValidateCGroupController("QEMU", "memory",
                                        VIR_HOST_VALIDATE_WARN,
                                        "MEMCG") < 0)
        ret = -1;

    if (virHostValidateCGroupController("QEMU", "cpu",
                                        VIR_HOST_VALIDATE_WARN,
                                        "CGROUP_CPU") < 0)
        ret = -1;

    if (virHostValidateCGroupController("QEMU", "cpuacct",
                                        VIR_HOST_VALIDATE_WARN,
                                        "CGROUP_CPUACCT") < 0)
        ret = -1;

    if (virHostValidateCGroupController("QEMU", "devices",
                                        VIR_HOST_VALIDATE_WARN,
                                        "CGROUP_DEVICES") < 0)
        ret = -1;

    if (virHostValidateCGroupController("QEMU", "net_cls",
                                        VIR_HOST_VALIDATE_WARN,
                                        "NET_CLS_CGROUP") < 0)
        ret = -1;

    if (virHostValidateCGroupController("QEMU", "blkio",
                                        VIR_HOST_VALIDATE_WARN,
                                        "BLK_CGROUP") < 0)
        ret = -1;

    if (virHostValidateIOMMU("QEMU",
                             VIR_HOST_VALIDATE_WARN) < 0)
        ret = -1;

    return ret;
}