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From: Programmingkid <programmingkidx@gmail.com>
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Date: Wed, 27 Apr 2016 20:25:26 -0400
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Subject: Re: [Qemu-devel] Is anyone able to load a web page from a guest
 operating system?
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To: Thomas Huth <thuth@redhat.com>, Peter Maydell <peter.maydell@linaro.org>
Cc: Samuel Thibault <samuel.thibault@ens-lyon.org>, "Dr. David Alan Gilbert" <dgilbert@redhat.com>, qemu-devel qemu-devel <qemu-devel@nongnu.org>


On Apr 27, 2016, at 2:34 AM, Thomas Huth wrote:

> On 26.04.2016 22:19, Programmingkid wrote:
>>=20
>> On Apr 26, 2016, at 4:12 PM, Thomas Huth wrote:
>>=20
>>> On 26.04.2016 21:25, Programmingkid wrote:
>>>>=20
>>>> On Apr 26, 2016, at 3:00 PM, Dr. David Alan Gilbert wrote:
>>>>=20
>>>>> * Programmingkid (programmingkidx@gmail.com) wrote:
>>>>>> My three guest operating systems can't load a web page. I think =
this is a bug with QEMU. Is there anyone who has the latest revision of =
QEMU that can access the web from a guest? Or are you experiencing the =
same problem?
> ...
>>>>> What's the qemu command line you use?
>>>> qemu-system-ppc -hda <hd1> -hdb <hd2> -m 512 -boot c -M mac99 =
-netdev user,id=3Dmynet0 -device usb-net,netdev=3Dmynet0 -cpu 750 =
-prom-env boot-args=3D-v -device ich9-usb-uhci1,id=3Dnewusb -device =
usb-audio,bus=3Dnewusb.0=20
>>>>=20
>>>> and
>>>>=20
>>>> qemu-system-ppc -hda <hd1> -hdb <hd2> -m 512 -boot c -M mac99 =
-netdev user,id=3Dmynet0 -device rtl8139,netdev=3Dmynet0 -cpu 750 =
-prom-env boot-args=3D-v -device ich9-usb-uhci1,id=3Dnewusb -device =
usb-audio,bus=3Dnewusb.0=20
>>>=20
>>> Ok, that means you're using user-mode / slirp networking.
>>> I just tried it with a pseries guest, and it seems to be working =
fine
>>> for me with the current git version of QEMU (f419a626c76bcb266).
>>=20
>> So you are saying you can view web pages on your guest?
>=20
> Yes. Linux guest on a Linux host, and I was able to access a web page
> from the guest.
>=20
>>>=20
>>> Now, what kind of host do you use? Mac OS X?=20
>> Yes. Mac OS 10.6.
>=20
> Ok, at least not Windows ... because there have been some problems =
with
> Windows recently, which could be the culprit otherwise:
>=20
> http://git.qemu.org/?p=3Dqemu.git;a=3Dcommitdiff;h=3D3424c8a9c89a3bc0d29=
ad
>=20
>>> Also can you determine a revision when it was still working fine for
>>> you? (and then maybe even bisect the problem?)
>>=20
>> I will see what I can find out.
>=20
> Thanks! Bisecting the problem is likely the best way to deal with =
this...

Found out which patch was causing problems. This one:=20

commit 5379229a2708df3a1506113315214c3ce5325859
Author: Guillaume Subiron <maethor@subiron.org>
Date:   Sat Dec 19 22:24:59 2015 +0100

    slirp: Factorizing address translation
   =20
    This patch factorizes some duplicate code into a new function,
    sotranslate_out(). This function perform the address translation =
when a
    packet is transmitted to the host network. If the packet is =
destinated
    to the host, the loopback address is used, and if the packet is
    destinated to the virtual DNS, the real DNS address is used. This =
code
    is just a copy of the existent, but factorized and ready to manage =
the
    IPv6 case.