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SubjectRe: regression - 2.6.36 -> 2.6.37 - kvm - 32bit SMP guests don't boot
On 02/24/2011 12:48 PM, Nikola Ciprich wrote:
> On Thu, Feb 24, 2011 at 12:17:40PM +0200, Avi Kivity wrote:
> > On 02/24/2011 01:42 AM, Nikola Ciprich wrote:
> >> Hello Avi et al,
> >> seems like I've hit regression in 2.6.37:
> >> 32bit SMP centos guest stopped booting, they just hang during initrd phase. (haven't tried
> >> different distros)
> >> UP guest are OK.
> >> when I (forcibly) compiled kvm-kmod-2.6.36.2 and used it in 2.6.37, even
> >> the SMP guests boot fine.
> >> does somebody have a tip on where the problem could be, or should I bisect this?
> >> I tried on 2 different machines, host is x86_64, qemu-kvm 0.13.0, 0.14.0.
> >> If I shall provide more information (or bisect), please let me know.
> >
> > Bisect is of course great, if laborious. Meanwhile can you post 'info
> > registers' for all cpus? Is the guest consuming cpu? kvm_stat output?
> yes, it's eating 100% of one CPU core.
>
> kvm_stat for few seconds (hunged guest is the only one running on the host):
>
> kvm_entry 29327 9091
> kvm_exit 29357 9090
> kvm_inj_virq 24588 7609
> kvm_apic_accept_irq 17146 5310
> kvm_emulate_insn 12682 3931
> kvm_apic 12530 3879
> kvm_mmio 12525 3879
> kvm_exit(APIC_ACCESS) 12525 3879
> kvm_exit(HLT) 11262 3466
> kvm_ioapic_set_irq 6532 2024
> kvm_set_irq 6538 2024
> kvm_pic_set_irq 6536 2024
> kvm_exit(EXTERNAL_INTERRUPT) 4255 1300
> kvm_ack_irq 2442 756
> kvm_exit(PENDING_INTERRUPT) 1030 335
> kvm_exit(IO_INSTRUCTION) 313 104
> kvm_pio 312 104
> kvm_age_page 18 6
> kvm_exit(EPT_VIOLATION) 14 4
> kvm_page_fault 12 4
> kvm_exit(INVALID_STATE) 4 0
> kvm_exit(VMLAUNCH) 3 0
> kvm_exit(CPUID) 3 0
> kvm_exit(DR_ACCESS) 2 0
> kvm_exit(MSR_READ) 2 0
> kvm_exit(PAUSE_INSTRUCTION) 1 0
>

Guest is churning along.

> info registers:
> EAX=00000000 EBX=6a000000 ECX=0000000a EDX=000f41a8
> ESI=000f41a8 EDI=00000000 EBP=c0690320 ESP=c0769f58
> EIP=c042d137 EFL=00000002 [-------] CPL=0 II=0 A20=1 SMM=0 HLT=0
>

Not very useful when the guest is making progress, I'm afraid.

> I'll wait a bit with bisect whether You'll spot some obvious bug or not ;)
> thanks for Your time!

Can you try a little trace-cmd -e kvm -b 20000?

> PS: I still owe You the kvm_stat comparison about this slow windows chkdsk problem,
> I'm aware of it, I just had to postpone this due to more urgent matters :(
> but I'll get back to it sooner or later..

Sure. Something similar that came up - sometimes Windows IDE drivers
fall back to PIO mode. Are you using IDE? If so, please check whether
it's using DMA or PIO.

--
error compiling committee.c: too many arguments to function



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