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From: Ken Moffat <>
To: Tiejun Chen <>, Paolo Bonzini <>
Subject: Re: Qemu e1000 broken in -rc1 and -rc2 : bisected
Date: Fri, 6 Mar 2015 19:27:28 +0000	[thread overview]
Message-ID: <20150306192728.GA5032@milliways> (raw)
In-Reply-To: <20150306000240.GA9960@milliways>

On Fri, Mar 06, 2015 at 12:02:40AM +0000, Ken Moffat wrote:
>  I have a very recent qemu i686 image, using a 3.19.0 kernel and
> dhclient, which works fine if the host is running a 3.19.0 kernel,
> but breaks when the host runs 4.0.0-rc1 or -rc2.
>  On those, dhclient does not get an address, so I have no network.
> There is a message
> e1000 0000:00:03.0 eth0: Reset adaptor
>  Before I start trying to bisect this, has anybody already seen, or
> fixed, it ?
b4eef9b36db461ca44832226fbca614db58c0c33 is the first bad commit
commit b4eef9b36db461ca44832226fbca614db58c0c33
Author: Tiejun Chen <>
Date:   Mon Dec 22 10:32:57 2014 +0100

    kvm: x86: vmx: NULL out hwapic_isr_update() in case of
    In most cases calling hwapic_isr_update(), we always check if
    kvm_apic_vid_enabled() == 1, but actually,
        -> kvm_x86_ops->vm_has_apicv()
            -> vmx_vm_has_apicv() or '0' in svm case
                -> return enable_apicv && irqchip_in_kernel(kvm)
    So its a little cost to recall vmx_vm_has_apicv() inside
    hwapic_isr_update(), here just NULL out hwapic_isr_update() in
    case of !enable_apicv inside hardware_setup() then make all
    related stuffs follow this. Note we don't check this under that
    condition of irqchip_in_kernel() since we should make sure
    definitely any caller don't work  without in-kernel irqchip.
    Signed-off-by: Tiejun Chen <>
    Signed-off-by: Paolo Bonzini <>

 I have reverted this from -rc2 (big offsets, 209 and 357 lines) and
everything is working again.

Nanny Ogg usually went to bed early. After all, she was an old lady.
Sometimes she went to bed as early as 6 a.m.

  reply	other threads:[~2015-03-06 19:28 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-03-06  0:02 Qemu e1000 broken in -rc1 and -rc2 Ken Moffat
2015-03-06 19:27 ` Ken Moffat [this message]
2015-03-09  3:14   ` Qemu e1000 broken in -rc1 and -rc2 : bisected Chen, Tiejun
2015-03-09 15:05     ` Ken Moffat

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