Re: [Qemu-devel] trace in arch/x86/kernel/apic/apic.c:1309 setup_local_APIC

[Yang Zhang]

On 2016/1/26 19:40, Stefan Priebe - Profihost AG wrote:
> Am 26.01.2016 um 12:39 schrieb Yang Zhang:
> > On 2016/1/26 18:43, Stefan Priebe - Profihost AG wrote:
> > > Am 26.01.2016 um 11:13 schrieb Yang Zhang:
> > > > On 2016/1/26 15:22, Stefan Priebe - Profihost AG wrote:
> > > > > Hi,
> > > > >
> > > > > Am 26.01.2016 um 02:46 schrieb Han, Huaitong:
> > > > > > What is the host kernel version and host dmesg information? And does
> > > > > > the problem exist when you use latest kernel and QEMU to replace old
> > > > > > binary file?
> > > > >
> > > > > Guest and Host is both 4.1.15. You mean the complete dmesg output from
> > > > > host?
> > > > >
> > > > > What do you mean with replace old binary file? I haven't tested Kernel
> > > > > 4.4 as we use 4.1 as it is a long term stable kernel release.
> > > >
> > > > Have you seen this before? I mean use the old KVM like 3.10?
> > >
> > > Guest or host? To test with a guest would be quite easy. Downgrading the
> > > host is very difficult not sure if the hw is supported.
> >
> > Host. Does the issue only exist on the Westmere CPU?
>
> Yes. All E5 Xeons v1, v2, v3 are working fine and i've never seen this
> message.
>
> Stefan
>
> > > > > Stefan
> > > > >
> > > > > > On Mon, 2016-01-25 at 14:51 +0100, Stefan Priebe - Profihost AG wrote:
> > > > > > > Hi,
> > > > > > >
> > > > > > > while running qemu 2.4 on whestmere CPUs i'm pretty often getting
> > > > > > > this
> > > > > > > one while booting:
> > > > > > > [    0.811645] Switched APIC routing to physical x2apic.

Westmere doesn't have the x2apic support. It is strange to see it here. 
Can you try to disable x2apic manually on you Qemu cmdline?

> > > > > > > [    1.835678] ------------[ cut here ]------------
> > > > > > > [    1.835704] WARNING: CPU: 0 PID: 1 at
> > > > > > > arch/x86/kernel/apic/apic.c:1309 setup_local_APIC+0x284/0x340()
> > > > > > > [    1.835714] Modules linked in:
> > > > > > > [    1.835724] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 4.1.15+72-ph
> > > > > > > #1
> > > > > > > [    1.835731] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996),
> > > > > > > BIOS rel-1.8.2-0-g33fbe13 by qemu-project.org 04/01/2014
> > > > > > > [    1.835743]  ffffffffb69ffcea ffff88042d5e3d68 ffffffffb669c37b
> > > > > > > 0000000000000918
> > > > > > > [    1.835754]  0000000000000000 ffff88042d5e3da8 ffffffffb6080d67
> > > > > > > ffff88042d5e3da8
> > > > > > > [    1.835765]  0000000000000001 0000000000000000 0000000000008000
> > > > > > > 0000000000000000
> > > > > > > [    1.835777] Call Trace:
> > > > > > > [    1.835789]  [<ffffffffb669c37b>] dump_stack+0x45/0x57
> > > > > > > [    1.835799]  [<ffffffffb6080d67>] warn_slowpath_common+0x97/0xe0
> > > > > > > [    1.835806]  [<ffffffffb6080dca>] warn_slowpath_null+0x1a/0x20
> > > > > > > [    1.835813]  [<ffffffffb603eeb4>] setup_local_APIC+0x284/0x340
> > > > > > > [    1.835824]  [<ffffffffb6d7c29d>] apic_bsp_setup+0x5b/0xb0
> > > > > > > [    1.835832]  [<ffffffffb6d79fa7>]
> > > > > > > native_smp_prepare_cpus+0x23b/0x295
> > > > > > > [    1.835842]  [<ffffffffb6d6c1b9>] kernel_init_freeable+0xc7/0x20f
> > > > > > > [    1.835853]  [<ffffffffb668d5c0>] ? rest_init+0x80/0x80
> > > > > > > [    1.835860]  [<ffffffffb668d5ce>] kernel_init+0xe/0xf0
> > > > > > > [    1.835870]  [<ffffffffb66a2fe2>] ret_from_fork+0x42/0x70
> > > > > > > [    1.835877]  [<ffffffffb668d5c0>] ? rest_init+0x80/0x80
> > > > > > > [    1.835891] ---[ end trace bdbe630a8de2832c ]---
> > > > > > > [    1.837613] Spurious LAPIC timer interrupt on cpu 0
> > > > > > > [    1.837957] ..TIMER: vector=0x30 apic1=0 pin1=2 apic2=-1 pin2=-1
> > > > > > > [    1.939574] smpboot: CPU0: Intel Westmere E56xx/L56xx/X56xx
> > > > > > > (Nehalem-C) (fam: 06, model: 2c, stepping: 01)
> > > > > > > [    1.939630] Performance Events: unsupported p6 CPU model 44 no PMU
> > > > > > > driver, software events only.
> > > > > > > [    1.950868] KVM setup paravirtual spinlock
> > > > > > >
> > > > > > > Greets,
> > > > > > > Stefan
> > > > > > > --
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> > > > > --
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--
best regards
yang