Re: [Pkg-xen-devel] Bug#795330: Suggests noapic but doesn't support it

Re: [Pkg-xen-devel] Bug#795330: Suggests noapic but doesn't support it

[Ian Campbell]

Control: tag -1 upstream 

Jan/Andy & David,

Is there anything we can improve here on either the Xen or kernel side do
you think?

On Thu, 2015-08-13 at 00:59 +0200, Guido Günther wrote:
> Package: xen-hypervisor-4.5-amd64
> Severity: normal
> 
> Hi,
> when running xen inside of kvm the hypervisor fails to set up the proper
> IRQ routing and suggests to use noapic.

FTR, it seems to say:

    panic("IO-APIC + timer doesn't work!  Boot with apic_verbosity=debug "
          "and send a report.  Then try booting with the 'noapic' option");

Did you also try the first thing it suggested? What was the result?

>  If you add this via
> 
>     GRUB_CMDLINE_XEN_DEFAULT
> 
> it will boot futher but then report that noapic isn't supported.

Is this the kernel saying that or Xen? Do you have full boot logs?

I think it is the kernel since I can't find such a message in Xen and 
http://xenbits.xen.org/docs/unstable/misc/xen-command-line.html says for
the noapic option: "This is not recommended with pvops type kernels."

> So please make Xen not claim to support noapic if it doesn't

I think ultimately this is down to different components being able to
support different things, e.g. Xen's advice might be fine with a FreeBSD
dom0 or some other version of Linux.

>  (the issue
> was finally resolved by removeing all virtion devices and doubling the

                                        ^virtio ?

> hypervisors RAM so the suggestion was misplaced anyways).

I can see how the virtio thing might make the KVM guest look different to
Xen, but the RAM thing seems orthogonal.

Thanks,
Ian.

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Re: [Pkg-xen-devel] Bug#795330: Suggests noapic but doesn't support it

[David Vrabel]

On 04/09/15 14:38, Ian Campbell wrote:
> Control: tag -1 upstream 
> 
> Jan/Andy & David,
> 
> Is there anything we can improve here on either the Xen or kernel side do
> you think?
> 
> On Thu, 2015-08-13 at 00:59 +0200, Guido Günther wrote:
>> Package: xen-hypervisor-4.5-amd64
>> Severity: normal
>>
>> Hi,
>> when running xen inside of kvm the hypervisor fails to set up the proper
>> IRQ routing and suggests to use noapic.
> 
> FTR, it seems to say:
> 
>     panic("IO-APIC + timer doesn't work!  Boot with apic_verbosity=debug "
>           "and send a report.  Then try booting with the 'noapic' option");

This is the Linux kernel making a recommendation for its command line.

> Did you also try the first thing it suggested? What was the result?
> 
>>  If you add this via
>>
>>     GRUB_CMDLINE_XEN_DEFAULT
>>
>> it will boot futher but then report that noapic isn't supported.

Don't add Linux command line options to the Xen command line.

David

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Re: [Pkg-xen-devel] Bug#795330: Suggests noapic but doesn't support it

[Ian Campbell]

On Fri, 2015-09-04 at 15:04 +0100, David Vrabel wrote:
> On 04/09/15 14:38, Ian Campbell wrote:
> > Control: tag -1 upstream 
> > 
> > Jan/Andy & David,
> > 
> > Is there anything we can improve here on either the Xen or kernel side 
> > do
> > you think?
> > 
> > On Thu, 2015-08-13 at 00:59 +0200, Guido Günther wrote:
> > > Package: xen-hypervisor-4.5-amd64
> > > Severity: normal
> > > 
> > > Hi,
> > > when running xen inside of kvm the hypervisor fails to set up the 
> > > proper
> > > IRQ routing and suggests to use noapic.
> > 
> > FTR, it seems to say:
> > 
> >     panic("IO-APIC + timer doesn't work!  Boot with 
> > apic_verbosity=debug "
> >           "and send a report.  Then try booting with the 'noapic' 
> > option");
> 
> This is the Linux kernel making a recommendation for its command line.

I cut-n-paste that message from xen.git. Although maybe in a file which
originates in Linux.

(So now I realised I don't really know which entity was complaining)

> > Did you also try the first thing it suggested? What was the result?
> > 
> > >  If you add this via
> > > 
> > >     GRUB_CMDLINE_XEN_DEFAULT
> > > 
> > > it will boot futher but then report that noapic isn't supported.
> 
> Don't add Linux command line options to the Xen command line.
> 
> David
> 
> _______________________________________________
> Xen-devel mailing list
> Xen-devel@lists.xen.org
> http://lists.xen.org/xen-devel

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Re: [Pkg-xen-devel] Bug#795330: Suggests noapic but doesn't support it

[David Vrabel]

On 04/09/15 15:13, Ian Campbell wrote:
> On Fri, 2015-09-04 at 15:04 +0100, David Vrabel wrote:
>> On 04/09/15 14:38, Ian Campbell wrote:
>>> Control: tag -1 upstream 
>>>
>>> Jan/Andy & David,
>>>
>>> Is there anything we can improve here on either the Xen or kernel side 
>>> do
>>> you think?
>>>
>>> On Thu, 2015-08-13 at 00:59 +0200, Guido Günther wrote:
>>>> Package: xen-hypervisor-4.5-amd64
>>>> Severity: normal
>>>>
>>>> Hi,
>>>> when running xen inside of kvm the hypervisor fails to set up the 
>>>> proper
>>>> IRQ routing and suggests to use noapic.
>>>
>>> FTR, it seems to say:
>>>
>>>     panic("IO-APIC + timer doesn't work!  Boot with 
>>> apic_verbosity=debug "
>>>           "and send a report.  Then try booting with the 'noapic' 
>>> option");
>>
>> This is the Linux kernel making a recommendation for its command line.
> 
> I cut-n-paste that message from xen.git. Although maybe in a file which
> originates in Linux.
> 
> (So now I realised I don't really know which entity was complaining)

Oh, in which case removing (from Xen) the recommendation to try noapic
might be useful.

David

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Re: [Pkg-xen-devel] Bug#795330: Suggests noapic but doesn't support it

[Jan Beulich]

>>> On 04.09.15 at 16:22, <david.vrabel@citrix.com> wrote:
> Oh, in which case removing (from Xen) the recommendation to try noapic
> might be useful.

Hmm - so far I didn't the option was not working. I also don't
understand the reference to pv-ops kernels in the doc. Sadly it's
not clear where this comes from, since Ian has imported it from
the wiki, and in the wiki it has been there from the beginning
(with no hint to where that first version came from).

Jan

Re: [Pkg-xen-devel] Bug#795330: Suggests noapic but doesn't support it

[Jan Beulich]

>>> On 04.09.15 at 16:13, <ijc@debian.org> wrote:
> On Fri, 2015-09-04 at 15:04 +0100, David Vrabel wrote:
>> On 04/09/15 14:38, Ian Campbell wrote:
>> > On Thu, 2015-08-13 at 00:59 +0200, Guido Günther wrote:
>> > > Package: xen-hypervisor-4.5-amd64
>> > > Severity: normal
>> > > 
>> > > Hi,
>> > > when running xen inside of kvm the hypervisor fails to set up the 
>> > > proper
>> > > IRQ routing and suggests to use noapic.
>> > 
>> > FTR, it seems to say:
>> > 
>> >     panic("IO-APIC + timer doesn't work!  Boot with 
>> > apic_verbosity=debug "
>> >           "and send a report.  Then try booting with the 'noapic' 
>> > option");
>> 
>> This is the Linux kernel making a recommendation for its command line.
> 
> I cut-n-paste that message from xen.git. Although maybe in a file which
> originates in Linux.
> 
> (So now I realised I don't really know which entity was complaining)

The reference to apic_verbosity= makes it Xen (Linux uses apic= here).

Jan

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