Re: [opensuse-arm] Re: New 32-bit Arm support needed for future OBS builds

2020-02-19 Thread Matthias Brugger



On 19/02/2020 17:21, Matwey V. Kornilov wrote:
> 19.02.2020 12:26, Matthias Brugger пишет:
>>
>>
>> On 05/02/2020 17:22, Guillaume Gardet wrote:
>>>
>>>
>>>> -Original Message-
>>>> From: Torsten Duwe 
>>>> Sent: 05 February 2020 16:41
>>>> To: Guillaume Gardet 
>>>> Cc: Josua Mayer ; 
>>>> opensuse-arm-staj6esoqrxg9huczpv...@public.gmane.org
>>>> Subject: Re: [opensuse-arm] Re: New 32-bit Arm support needed for future 
>>>> OBS
>>>> builds
>>>>
>>>> On Wed, Feb 05, 2020 at 03:15:28PM +, Guillaume Gardet wrote:
>>>>>
>>>>> No, that is the problem. With newer hardware, this option will be gone as 
>>>>> 32-bit
>>>> mode will not be supported in kernel mode, so qemu/kvm cannot run armv7
>>>> kernel.
>>>>
>>>> Are you sure about this? I mean, those cores will not be able to run 
>>>> 32-bit kernels
>>>> natively, sure, but my (maybe outdated) information is that kvm always runs
>>>> guest code in "user mode" and faults on privileged instructions, which are 
>>>> then
>>>> emulated anyway.
>>>
>>> That's what I have been told. I will double check.
>>>
>>
>> Were you abe to double check? I belive we can run 32-bit VMs on 64-bit 
>> machines.
>> The thing is that KVM for arm32 will be dropped in the future. I know we are
> 
> Why it will be dropped?
> 

Because it complicates the maintenance of KVM on ARM and there was a bug for a
long time and no one complained, what indicates no user who is relying on a
recent kernel for that.

Regards,
Matthias
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[opensuse-arm] Re: New 32-bit Arm support needed for future OBS builds

2020-02-19 Thread Matwey V. Kornilov
19.02.2020 12:26, Matthias Brugger пишет:
> 
> 
> On 05/02/2020 17:22, Guillaume Gardet wrote:
>>
>>
>>> -Original Message-
>>> From: Torsten Duwe 
>>> Sent: 05 February 2020 16:41
>>> To: Guillaume Gardet 
>>> Cc: Josua Mayer ; 
>>> opensuse-arm-staj6esoqrxg9huczpv...@public.gmane.org
>>> Subject: Re: [opensuse-arm] Re: New 32-bit Arm support needed for future OBS
>>> builds
>>>
>>> On Wed, Feb 05, 2020 at 03:15:28PM +, Guillaume Gardet wrote:
>>>>
>>>> No, that is the problem. With newer hardware, this option will be gone as 
>>>> 32-bit
>>> mode will not be supported in kernel mode, so qemu/kvm cannot run armv7
>>> kernel.
>>>
>>> Are you sure about this? I mean, those cores will not be able to run 32-bit 
>>> kernels
>>> natively, sure, but my (maybe outdated) information is that kvm always runs
>>> guest code in "user mode" and faults on privileged instructions, which are 
>>> then
>>> emulated anyway.
>>
>> That's what I have been told. I will double check.
>>
> 
> Were you abe to double check? I belive we can run 32-bit VMs on 64-bit 
> machines.
> The thing is that KVM for arm32 will be dropped in the future. I know we are

Why it will be dropped?

> using some arm32 HW to build packages, so we should look for an alternative.
> 
> Regards,
> Matthias
> 


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Re: [opensuse-arm] Re: New 32-bit Arm support needed for future OBS builds

2020-02-19 Thread Matthias Brugger



On 05/02/2020 17:22, Guillaume Gardet wrote:
> 
> 
>> -Original Message-
>> From: Torsten Duwe 
>> Sent: 05 February 2020 16:41
>> To: Guillaume Gardet 
>> Cc: Josua Mayer ; opensuse-arm@opensuse.org
>> Subject: Re: [opensuse-arm] Re: New 32-bit Arm support needed for future OBS
>> builds
>>
>> On Wed, Feb 05, 2020 at 03:15:28PM +, Guillaume Gardet wrote:
>>>
>>> No, that is the problem. With newer hardware, this option will be gone as 
>>> 32-bit
>> mode will not be supported in kernel mode, so qemu/kvm cannot run armv7
>> kernel.
>>
>> Are you sure about this? I mean, those cores will not be able to run 32-bit 
>> kernels
>> natively, sure, but my (maybe outdated) information is that kvm always runs
>> guest code in "user mode" and faults on privileged instructions, which are 
>> then
>> emulated anyway.
> 
> That's what I have been told. I will double check.
> 

Were you abe to double check? I belive we can run 32-bit VMs on 64-bit machines.
The thing is that KVM for arm32 will be dropped in the future. I know we are
using some arm32 HW to build packages, so we should look for an alternative.

Regards,
Matthias
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RE: [opensuse-arm] Re: New 32-bit Arm support needed for future OBS builds

2020-02-05 Thread Guillaume Gardet



> -Original Message-
> From: Torsten Duwe 
> Sent: 05 February 2020 16:41
> To: Guillaume Gardet 
> Cc: Josua Mayer ; opensuse-arm@opensuse.org
> Subject: Re: [opensuse-arm] Re: New 32-bit Arm support needed for future OBS
> builds
>
> On Wed, Feb 05, 2020 at 03:15:28PM +, Guillaume Gardet wrote:
> >
> > No, that is the problem. With newer hardware, this option will be gone as 
> > 32-bit
> mode will not be supported in kernel mode, so qemu/kvm cannot run armv7
> kernel.
>
> Are you sure about this? I mean, those cores will not be able to run 32-bit 
> kernels
> natively, sure, but my (maybe outdated) information is that kvm always runs
> guest code in "user mode" and faults on privileged instructions, which are 
> then
> emulated anyway.

That's what I have been told. I will double check.

Cheers,
Guillaume


>
> Torsten

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Re: [opensuse-arm] Re: New 32-bit Arm support needed for future OBS builds

2020-02-05 Thread Torsten Duwe
On Wed, Feb 05, 2020 at 03:15:28PM +, Guillaume Gardet wrote:
> 
> No, that is the problem. With newer hardware, this option will be gone as 
> 32-bit mode will not be supported in kernel mode, so qemu/kvm cannot run 
> armv7 kernel.

Are you sure about this? I mean, those cores will not be able to run 32-bit
kernels natively, sure, but my (maybe outdated) information is that kvm always
runs guest code in "user mode" and faults on privileged instructions, which
are then emulated anyway.

Torsten

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RE: [opensuse-arm] Re: New 32-bit Arm support needed for future OBS builds

2020-02-05 Thread Guillaume Gardet


> -Original Message-
> From: Josua Mayer 
> Sent: 05 February 2020 16:11
> To: opensuse-arm@opensuse.org
> Subject: Re: [opensuse-arm] Re: New 32-bit Arm support needed for future OBS
> builds
>
> Greetings everybody,
>
>
> Am 05.02.20 um 14:28 schrieb Adrian Schröter:
> > On Mittwoch, 5. Februar 2020, 12:26:45 CET Guillaume Gardet wrote:
> >>
> >>> -Original Message-
> >>> From: Adrian Schröter 
> >>> Sent: 05 February 2020 11:40
> >>> To: opensuse-arm@opensuse.org; Guillaume Gardet
> >>> 
> >>> Cc: Andreas Färber ; adr...@suse.com; nd
> >>> 
> >>> Subject: Re: [opensuse-arm] Re: New 32-bit Arm support needed for
> >>> future OBS builds
> >>>
> >>> On Mittwoch, 5. Februar 2020, 11:34:00 CET Guillaume Gardet wrote:
> >>>>
> >>>>> -Original Message-----
> >>>>> From: Adrian Schröter 
> >>>>> Sent: 05 February 2020 11:16
> >>>>> To: opensuse-arm@opensuse.org; Guillaume Gardet
> >>>>> 
> >>>>> Cc: Andreas Färber ; adr...@suse.com; nd
> >>>>> 
> >>>>> Subject: [opensuse-arm] Re: New 32-bit Arm support needed for
> >>>>> future OBS builds
> >>>>>
> >>>>> On Mittwoch, 5. Februar 2020, 11:16:02 CET Guillaume Gardet wrote:
> >>>>>> Hi,
> >>>>>>
> >>>>>> As you may know, OBS has a low number of 32-bit Arm capable workers.
> >>>>>> Some Arm servers are AArch64 only and some are still supporting
> >>>>>> 32-bit
> >>> mode.
> >>>>>>
> >>>>>> The thing is new AArch64 SoC (Arm Neoverse N1) will still have
> >>>>>> the ability to run
> >>>>> Arm 32-bit code, but only for user space (not for kernel anymore).
> >>>>>> So, we could still build for 32-bit Arm with those kind of
> >>>>>> machines, but our
> >>>>> current setup (qemu/kvm in 32-bit mode) will not work anymore.
> >>>>>>
> >>>>>> Here are the solutions which could be used:
> >>>>>> * 64-bit qemu (with a 64-bit kernel) with armv6/armv7 rootfs
> Is there an option missing here, namely aarch64 qemu using kvm with armv7-a
> kernel and userspace?

No, that is the problem. With newer hardware, this option will be gone as 
32-bit mode will not be supported in kernel mode, so qemu/kvm cannot run armv7 
kernel.

Guillaume


>
> >>>>>> * 32-bit containers on aarch64 (qemu) host
> >>>>>> * qemu without kvm: will probably be too slow
> >>>>>>
> >>>>>> I do not know how much work it would require to support one of
> >>>>>> those
> >>>>> solutions and how many packages will be confused by a 64-bit kernel.
> >>>>>
> >>>>> I will object against the "without KVM" approach as OBS admin,
> >>>>> since it means you can take over the worker.
> >>>>
> >>>> So, against qemu without KVM (we did that in the past for armv6 on
> >>>> x86_64
> >>> machines, IIRC) and against containers as well?
> >>>
> >>> armv6 was qemu inside KVM. That is a possible way.
> >>
> >> That is the current state.
> >
> > qemu-user-land inside of KVM, right ...
> >
> >> AFAIK, you cannot use KVM for armv6 qemu on x86_64.
> >
> > qemu-system inside of KVM?
> >
> > Yes, not right now, we could teach the build script yet-another mode 
> > tough
> >
> > Question is if it really makes sense, because even slow native hardware 
> > would
> be faster...
> >
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Re: [opensuse-arm] Re: New 32-bit Arm support needed for future OBS builds

2020-02-05 Thread Josua Mayer
Greetings everybody,


Am 05.02.20 um 14:28 schrieb Adrian Schröter:
> On Mittwoch, 5. Februar 2020, 12:26:45 CET Guillaume Gardet wrote:
>>
>>> -Original Message-
>>> From: Adrian Schröter 
>>> Sent: 05 February 2020 11:40
>>> To: opensuse-arm@opensuse.org; Guillaume Gardet
>>> 
>>> Cc: Andreas Färber ; adr...@suse.com; nd 
>>> Subject: Re: [opensuse-arm] Re: New 32-bit Arm support needed for future OBS
>>> builds
>>>
>>> On Mittwoch, 5. Februar 2020, 11:34:00 CET Guillaume Gardet wrote:
>>>>
>>>>> -Original Message-
>>>>> From: Adrian Schröter 
>>>>> Sent: 05 February 2020 11:16
>>>>> To: opensuse-arm@opensuse.org; Guillaume Gardet
>>>>> 
>>>>> Cc: Andreas Färber ; adr...@suse.com; nd
>>>>> 
>>>>> Subject: [opensuse-arm] Re: New 32-bit Arm support needed for future
>>>>> OBS builds
>>>>>
>>>>> On Mittwoch, 5. Februar 2020, 11:16:02 CET Guillaume Gardet wrote:
>>>>>> Hi,
>>>>>>
>>>>>> As you may know, OBS has a low number of 32-bit Arm capable workers.
>>>>>> Some Arm servers are AArch64 only and some are still supporting 32-bit
>>> mode.
>>>>>>
>>>>>> The thing is new AArch64 SoC (Arm Neoverse N1) will still have the
>>>>>> ability to run
>>>>> Arm 32-bit code, but only for user space (not for kernel anymore).
>>>>>> So, we could still build for 32-bit Arm with those kind of
>>>>>> machines, but our
>>>>> current setup (qemu/kvm in 32-bit mode) will not work anymore.
>>>>>>
>>>>>> Here are the solutions which could be used:
>>>>>> * 64-bit qemu (with a 64-bit kernel) with armv6/armv7 rootfs
Is there an option missing here, namely aarch64 qemu using kvm with
armv7-a kernel and userspace?

>>>>>> * 32-bit containers on aarch64 (qemu) host
>>>>>> * qemu without kvm: will probably be too slow
>>>>>>
>>>>>> I do not know how much work it would require to support one of
>>>>>> those
>>>>> solutions and how many packages will be confused by a 64-bit kernel.
>>>>>
>>>>> I will object against the "without KVM" approach as OBS admin, since
>>>>> it means you can take over the worker.
>>>>
>>>> So, against qemu without KVM (we did that in the past for armv6 on x86_64
>>> machines, IIRC) and against containers as well?
>>>
>>> armv6 was qemu inside KVM. That is a possible way.
>>
>> That is the current state.
> 
> qemu-user-land inside of KVM, right ...
> 
>> AFAIK, you cannot use KVM for armv6 qemu on x86_64.
> 
> qemu-system inside of KVM? 
> 
> Yes, not right now, we could teach the build script yet-another mode tough
> 
> Question is if it really makes sense, because even slow native hardware would 
> be faster...
> 
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Re: [opensuse-arm] Re: New 32-bit Arm support needed for future OBS builds

2020-02-05 Thread Adrian Schröter
On Mittwoch, 5. Februar 2020, 12:26:45 CET Guillaume Gardet wrote:
> 
> > -Original Message-
> > From: Adrian Schröter 
> > Sent: 05 February 2020 11:40
> > To: opensuse-arm@opensuse.org; Guillaume Gardet
> > 
> > Cc: Andreas Färber ; adr...@suse.com; nd 
> > Subject: Re: [opensuse-arm] Re: New 32-bit Arm support needed for future OBS
> > builds
> > 
> > On Mittwoch, 5. Februar 2020, 11:34:00 CET Guillaume Gardet wrote:
> > >
> > > > -Original Message-
> > > > From: Adrian Schröter 
> > > > Sent: 05 February 2020 11:16
> > > > To: opensuse-arm@opensuse.org; Guillaume Gardet
> > > > 
> > > > Cc: Andreas Färber ; adr...@suse.com; nd
> > > > 
> > > > Subject: [opensuse-arm] Re: New 32-bit Arm support needed for future
> > > > OBS builds
> > > >
> > > > On Mittwoch, 5. Februar 2020, 11:16:02 CET Guillaume Gardet wrote:
> > > > > Hi,
> > > > >
> > > > > As you may know, OBS has a low number of 32-bit Arm capable workers.
> > > > > Some Arm servers are AArch64 only and some are still supporting 32-bit
> > mode.
> > > > >
> > > > > The thing is new AArch64 SoC (Arm Neoverse N1) will still have the
> > > > > ability to run
> > > > Arm 32-bit code, but only for user space (not for kernel anymore).
> > > > > So, we could still build for 32-bit Arm with those kind of
> > > > > machines, but our
> > > > current setup (qemu/kvm in 32-bit mode) will not work anymore.
> > > > >
> > > > > Here are the solutions which could be used:
> > > > > * 64-bit qemu (with a 64-bit kernel) with armv6/armv7 rootfs
> > > > > * 32-bit containers on aarch64 (qemu) host
> > > > > * qemu without kvm: will probably be too slow
> > > > >
> > > > > I do not know how much work it would require to support one of
> > > > > those
> > > > solutions and how many packages will be confused by a 64-bit kernel.
> > > >
> > > > I will object against the "without KVM" approach as OBS admin, since
> > > > it means you can take over the worker.
> > >
> > > So, against qemu without KVM (we did that in the past for armv6 on x86_64
> > machines, IIRC) and against containers as well?
> > 
> > armv6 was qemu inside KVM. That is a possible way.
> 
> That is the current state.

qemu-user-land inside of KVM, right ...

> AFAIK, you cannot use KVM for armv6 qemu on x86_64.

qemu-system inside of KVM? 

Yes, not right now, we could teach the build script yet-another mode tough

Question is if it really makes sense, because even slow native hardware would 
be faster...

-- 

Adrian Schroeter 
Build Infrastructure Project Manager

SUSE Software Solutions Germany GmbH,  Maxfeldstr. 5, 90409 Nuernberg, Germany
(HRB 247165, AG München), Geschäftsführer: Felix Imendörffer




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RE: [opensuse-arm] Re: New 32-bit Arm support needed for future OBS builds

2020-02-05 Thread Guillaume Gardet



> -Original Message-
> From: Adrian Schröter 
> Sent: 05 February 2020 11:40
> To: opensuse-arm@opensuse.org; Guillaume Gardet
> 
> Cc: Andreas Färber ; adr...@suse.com; nd 
> Subject: Re: [opensuse-arm] Re: New 32-bit Arm support needed for future OBS
> builds
> 
> On Mittwoch, 5. Februar 2020, 11:34:00 CET Guillaume Gardet wrote:
> >
> > > -Original Message-
> > > From: Adrian Schröter 
> > > Sent: 05 February 2020 11:16
> > > To: opensuse-arm@opensuse.org; Guillaume Gardet
> > > 
> > > Cc: Andreas Färber ; adr...@suse.com; nd
> > > 
> > > Subject: [opensuse-arm] Re: New 32-bit Arm support needed for future
> > > OBS builds
> > >
> > > On Mittwoch, 5. Februar 2020, 11:16:02 CET Guillaume Gardet wrote:
> > > > Hi,
> > > >
> > > > As you may know, OBS has a low number of 32-bit Arm capable workers.
> > > > Some Arm servers are AArch64 only and some are still supporting 32-bit
> mode.
> > > >
> > > > The thing is new AArch64 SoC (Arm Neoverse N1) will still have the
> > > > ability to run
> > > Arm 32-bit code, but only for user space (not for kernel anymore).
> > > > So, we could still build for 32-bit Arm with those kind of
> > > > machines, but our
> > > current setup (qemu/kvm in 32-bit mode) will not work anymore.
> > > >
> > > > Here are the solutions which could be used:
> > > > * 64-bit qemu (with a 64-bit kernel) with armv6/armv7 rootfs
> > > > * 32-bit containers on aarch64 (qemu) host
> > > > * qemu without kvm: will probably be too slow
> > > >
> > > > I do not know how much work it would require to support one of
> > > > those
> > > solutions and how many packages will be confused by a 64-bit kernel.
> > >
> > > I will object against the "without KVM" approach as OBS admin, since
> > > it means you can take over the worker.
> >
> > So, against qemu without KVM (we did that in the past for armv6 on x86_64
> machines, IIRC) and against containers as well?
> 
> armv6 was qemu inside KVM. That is a possible way.

That is the current state.

AFAIK, you cannot use KVM for armv6 qemu on x86_64.

Guillaume

> 
> containers are not really desired security wise as well.
> 
> Keep in mind that a breakage here is not only affecting the maybe-not-so-much-
> important
> armv6 distro, but really all builds in OBS.
> 
> > >
> > > when you speak about qemu, you speak about user or system emulator?
> >
> > System emulator.
> 
> k, will not be a very fast approach, but you know that :)
> 
> --
> 
> Adrian Schroeter 
> Build Infrastructure Project Manager
> 
> SUSE Software Solutions Germany GmbH,  Maxfeldstr. 5, 90409 Nuernberg,
> Germany (HRB 247165, AG München), Geschäftsführer: Felix Imendörffer
> 
> 
> 

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Re: [opensuse-arm] Re: New 32-bit Arm support needed for future OBS builds

2020-02-05 Thread Adrian Schröter
On Mittwoch, 5. Februar 2020, 11:34:00 CET Guillaume Gardet wrote:
> 
> > -Original Message-
> > From: Adrian Schröter 
> > Sent: 05 February 2020 11:16
> > To: opensuse-arm@opensuse.org; Guillaume Gardet
> > 
> > Cc: Andreas Färber ; adr...@suse.com; nd 
> > Subject: [opensuse-arm] Re: New 32-bit Arm support needed for future OBS
> > builds
> > 
> > On Mittwoch, 5. Februar 2020, 11:16:02 CET Guillaume Gardet wrote:
> > > Hi,
> > >
> > > As you may know, OBS has a low number of 32-bit Arm capable workers.
> > > Some Arm servers are AArch64 only and some are still supporting 32-bit 
> > > mode.
> > >
> > > The thing is new AArch64 SoC (Arm Neoverse N1) will still have the 
> > > ability to run
> > Arm 32-bit code, but only for user space (not for kernel anymore).
> > > So, we could still build for 32-bit Arm with those kind of machines, but 
> > > our
> > current setup (qemu/kvm in 32-bit mode) will not work anymore.
> > >
> > > Here are the solutions which could be used:
> > > * 64-bit qemu (with a 64-bit kernel) with armv6/armv7 rootfs
> > > * 32-bit containers on aarch64 (qemu) host
> > > * qemu without kvm: will probably be too slow
> > >
> > > I do not know how much work it would require to support one of those
> > solutions and how many packages will be confused by a 64-bit kernel.
> > 
> > I will object against the "without KVM" approach as OBS admin, since it 
> > means
> > you can take over the worker.
> 
> So, against qemu without KVM (we did that in the past for armv6 on x86_64 
> machines, IIRC) and against containers as well?

armv6 was qemu inside KVM. That is a possible way.

containers are not really desired security wise as well.

Keep in mind that a breakage here is not only affecting the 
maybe-not-so-much-important
armv6 distro, but really all builds in OBS.

> > 
> > when you speak about qemu, you speak about user or system emulator?
> 
> System emulator.

k, will not be a very fast approach, but you know that :)

-- 

Adrian Schroeter 
Build Infrastructure Project Manager

SUSE Software Solutions Germany GmbH,  Maxfeldstr. 5, 90409 Nuernberg, Germany
(HRB 247165, AG München), Geschäftsführer: Felix Imendörffer




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RE: [opensuse-arm] Re: New 32-bit Arm support needed for future OBS builds

2020-02-05 Thread Guillaume Gardet



> -Original Message-
> From: Adrian Schröter 
> Sent: 05 February 2020 11:16
> To: opensuse-arm@opensuse.org; Guillaume Gardet
> 
> Cc: Andreas Färber ; adr...@suse.com; nd 
> Subject: [opensuse-arm] Re: New 32-bit Arm support needed for future OBS
> builds
> 
> On Mittwoch, 5. Februar 2020, 11:16:02 CET Guillaume Gardet wrote:
> > Hi,
> >
> > As you may know, OBS has a low number of 32-bit Arm capable workers.
> > Some Arm servers are AArch64 only and some are still supporting 32-bit mode.
> >
> > The thing is new AArch64 SoC (Arm Neoverse N1) will still have the ability 
> > to run
> Arm 32-bit code, but only for user space (not for kernel anymore).
> > So, we could still build for 32-bit Arm with those kind of machines, but our
> current setup (qemu/kvm in 32-bit mode) will not work anymore.
> >
> > Here are the solutions which could be used:
> > * 64-bit qemu (with a 64-bit kernel) with armv6/armv7 rootfs
> > * 32-bit containers on aarch64 (qemu) host
> > * qemu without kvm: will probably be too slow
> >
> > I do not know how much work it would require to support one of those
> solutions and how many packages will be confused by a 64-bit kernel.
> 
> I will object against the "without KVM" approach as OBS admin, since it means
> you can take over the worker.

So, against qemu without KVM (we did that in the past for armv6 on x86_64 
machines, IIRC) and against containers as well?

> 
> when you speak about qemu, you speak about user or system emulator?

System emulator.

Guillaume

> 
> --
> 
> Adrian Schroeter 
> Build Infrastructure Project Manager
> 
> SUSE Software Solutions Germany GmbH,  Maxfeldstr. 5, 90409 Nuernberg,
> Germany (HRB 247165, AG München), Geschäftsführer: Felix Imendörffer
> 
> 
> 
> 
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[opensuse-arm] Re: New 32-bit Arm support needed for future OBS builds

2020-02-05 Thread Adrian Schröter
On Mittwoch, 5. Februar 2020, 11:16:02 CET Guillaume Gardet wrote:
> Hi,
> 
> As you may know, OBS has a low number of 32-bit Arm capable workers.
> Some Arm servers are AArch64 only and some are still supporting 32-bit mode.
> 
> The thing is new AArch64 SoC (Arm Neoverse N1) will still have the ability to 
> run Arm 32-bit code, but only for user space (not for kernel anymore).
> So, we could still build for 32-bit Arm with those kind of machines, but our 
> current setup (qemu/kvm in 32-bit mode) will not work anymore.
> 
> Here are the solutions which could be used:
> * 64-bit qemu (with a 64-bit kernel) with armv6/armv7 rootfs
> * 32-bit containers on aarch64 (qemu) host
> * qemu without kvm: will probably be too slow
> 
> I do not know how much work it would require to support one of those 
> solutions and how many packages will be confused by a 64-bit kernel.

I will object against the "without KVM" approach as OBS admin, since it
means you can take over the worker.

when you speak about qemu, you speak about user or system emulator?

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Adrian Schroeter 
Build Infrastructure Project Manager

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