[Qemu-devel] did qemu-user mode support systemd

[Qemu-devel] did qemu-user mode support systemd

[fupan]

Hi, All

Did the qemu user mode support the systemd, cause I
met the following error while start an arm lxc on  x86-64:

qemu: Unsupported syscall: 355
Failed to allocate manager object: Function not implemented


Thanks!

Fupan

Re: [Qemu-devel] did qemu-user mode support systemd

[Peter Maydell]

On 17 March 2015 at 10:02, fupan <fupan.li@windriver.com> wrote:
> Did the qemu user mode support the systemd, cause I
> met the following error while start an arm lxc on  x86-64:
>
> qemu: Unsupported syscall: 355
> Failed to allocate manager object: Function not implemented

355 is signalfd4, which we don't currently implement.
A well designed userspace program will gracefully fall
back to some other implementation if it tries a newer
syscall but it doesn't exist.

-- PMM

Re: [Qemu-devel] did qemu-user mode support systemd

[Daniel P. Berrange]

On Tue, Mar 17, 2015 at 01:50:37PM +0000, Peter Maydell wrote:
> On 17 March 2015 at 10:02, fupan <fupan.li@windriver.com> wrote:
> > Did the qemu user mode support the systemd, cause I
> > met the following error while start an arm lxc on  x86-64:
> >
> > qemu: Unsupported syscall: 355
> > Failed to allocate manager object: Function not implemented
> 
> 355 is signalfd4, which we don't currently implement.
> A well designed userspace program will gracefully fall
> back to some other implementation if it tries a newer
> syscall but it doesn't exist.

systemd devs made an explicit decision to assume they have access to
the level of functionality provided in Linux >= 3.7.  So if we want
QEMU user mode to support systemd, then at some point we'll need to
implement signalfd4 support.

Regards,
Daniel
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Re: [Qemu-devel] did qemu-user mode support systemd

[Peter Maydell]

On 17 March 2015 at 13:55, Daniel P. Berrange <berrange@redhat.com> wrote:
> On Tue, Mar 17, 2015 at 01:50:37PM +0000, Peter Maydell wrote:
>> 355 is signalfd4, which we don't currently implement.
>> A well designed userspace program will gracefully fall
>> back to some other implementation if it tries a newer
>> syscall but it doesn't exist.
>
> systemd devs made an explicit decision to assume they have access to
> the level of functionality provided in Linux >= 3.7.  So if we want
> QEMU user mode to support systemd, then at some point we'll need to
> implement signalfd4 support.

Patches welcome :-)

-- PMM