Re: [Qemu-devel] [PATCH] linux-user: Add binfmt wrapper

[Joakim Tjernlund]

Alexander Graf <address@hidden> wrote on 2014/07/14 18:34:34:
> 
> 
> On 14.07.14 18:32, Joakim Tjernlund wrote:
> > Alexander Graf <address@hidden> wrote on 2014/07/14 18:00:35:
> > You think everyone feel OK with new defaults like OP ?
> >> Yes.
> > hmm, with current qemu it works to boot a LXC with just O flag.
> > Why would we then want to complicate things by adding OP which
> > then requires some version of my patch?
> 
> How does current QEMU boot anything with the 0 flag? It doesn't know how 

> to handle it and will misinterpret the argument, no?

my ppc gentoo LXC container boots just fine, why I don't know. I see a 
difference though:

with just O:
root         1  0.1  0.0 4138016 5736 ?        Ss   18:37   0:00 
/usr/bin/qemu-ppc-binfmt-wrapper /sbin/init
root        79  0.0  0.0 4138016 5792 ?        Ss   18:37   0:00 
/usr/bin/qemu-ppc-binfmt-wrapper /usr/sbin/sshd
root       293  0.0  0.0 4137952 4072 ?        Ss   18:37   0:00 
/usr/bin/qemu-ppc-binfmt-wrapper /bin/busybox u
root       334  0.3  0.0 4138016 5964 tty1     Ss+  18:37   0:00 
/usr/bin/qemu-ppc-binfmt-wrapper /sbin/agetty 3
root       335  3.0  0.0 4138048 7068 console  Ss   18:37   0:00 
/usr/bin/qemu-ppc-binfmt-wrapper /bin/login -- 
root       336  3.6  0.0 4138016 8916 console  S    18:37   0:00 
/usr/bin/qemu-ppc-binfmt-wrapper /bin/bash
root       340  0.0  0.0 4138016 6340 ?        R+   Jul10   0:00 /bin/ps 
uax

vs. with OP:
root         1  0.2  0.0 4138016 5748 ?        Ss   18:40   0:00 
/usr/bin/qemu-ppc-binfmt-wrapper /sbin/init /sb
root        79  0.0  0.0 4137984 5792 ?        Ss   18:41   0:00 
/usr/bin/qemu-ppc-binfmt-wrapper /usr/sbin/sshd
root       293  0.0  0.0 4137984 4064 ?        Ss   18:41   0:00 
/usr/bin/qemu-ppc-binfmt-wrapper /bin/busybox /
root       334  0.2  0.0 4138016 7664 tty1     Ss+  18:41   0:00 
/usr/bin/qemu-ppc-binfmt-wrapper /sbin/agetty /
root       335  2.1  0.0 4138048 8512 console  Ss   18:41   0:00 
/usr/bin/qemu-ppc-binfmt-wrapper /bin/login /bi
root       336  3.6  0.0 4138016 7932 console  S    18:41   0:00 
/usr/bin/qemu-ppc-binfmt-wrapper /bin/bash -bas
root       340  0.0  0.0 4138016 8384 ?        R+   Jul10   0:00 /bin/ps 
ps uax

So the argv is different but the small gentoo image survies that, just by 
chance I suppose :)

 Jocke