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Re: [libvirt] [PATCH] Fix disability to run on systems with no PCI bus



Hello there,

I wrote in February this year following:

boromir:/ # qemu-system-s390x --enable-kvm -monitor stdio
VNC server running on `::1:5900'
QEMU 0.12.50 monitor - type 'help' for more information
(qemu) info qtree
bus: main-system-bus
  type System
  dev: s390-virtio-bridge, id ""
    bus: s390-virtio
      type s390-virtio
      dev: virtio-serial-s390, id ""
        dev-prop: max_ports = 31
        bus: virtio-serial-bus.0
          type virtio-serial-bus
          dev: virtconsole, id ""
            dev-prop: is_console = 1
            dev-prop: chardev = virtcon0
            dev-prop: name = <null>
             dev-prop-int: id: 0
             dev-prop-int: guest_connected: 1
             dev-prop-int: host_connected: 1
      dev: virtio-net-s390, id ""
        dev-prop: mac = 52:54:00:12:34:56
        dev-prop: vlan = 0
        dev-prop: netdev = <null>
(qemu) quit

You can see that on s390 there is a Bus called 's390-virtio'.
This works also on our s390x (z9) Machine.

Regards
Patrick Siegl

Am 22.04.2011 11:00, schrieb Michal Prívozník:
> On 04/22/2011 10:19 AM, Jiri Denemark wrote:
>> On Fri, Apr 22, 2011 at 09:58:38 +0200, Michal Privoznik wrote:
>>> The patch which moved libpciaccess initialization to one place caused
>>> regression - we were not able to run on system with no PCI bus, like
>>> s390(x). This patch fix it.
>>> ---
>>>   src/node_device/node_device_udev.c |    6 ++++++
>>>   1 files changed, 6 insertions(+), 0 deletions(-)
>>>
>>> diff --git a/src/node_device/node_device_udev.c
>>> b/src/node_device/node_device_udev.c
>>> index 2139ef3..b6335ff 100644
>>> --- a/src/node_device/node_device_udev.c
>>> +++ b/src/node_device/node_device_udev.c
>>> @@ -1603,7 +1603,13 @@ static int udevDeviceMonitorStartup(int
>>> privileged)
>>>               char ebuf[256];
>>>               VIR_ERROR(_("Failed to initialize libpciaccess: %s"),
>>>                         virStrerror(pciret, ebuf, sizeof ebuf));
>>> +#if defined __s390__ || defined __s390x_
>>> +            /* On x390(x) system there is no PCI bus.
>>> +             * Therefore we do not want to return error here */
>>> +            ret = 0;
>>> +#else
>>>               ret = -1;
>>> +#endif
>>>               goto out;
>>>           }
>>>       }
>>
>> Why do we try to initialize libpciaccess if we know it won't succeed?
>> What
>> about just completely dropping libpciaccess dependency on s390(x)?
>>
>> Jirka
>
> Well,
> although investigation on the internet shows there is at least
> PCI-like bus, linux kernel doesn't know how to use it (see
> arch/s390/include/asm/pci.h) which is the most important. so NAK and
> prepare v2.
>
> Michal
>
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> libvir-list redhat com
> https://www.redhat.com/mailman/listinfo/libvir-list


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