linux-kernel - Re: VMs freezing when host is running 4.14

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Message-ID: <20171122164312.GA21279@flask>
Date:   Wed, 22 Nov 2017 17:43:13 +0100
From:   Radim Krčmář <rkrcmar@...hat.com>
To:     Marc Haber <mh+linux-kernel@...schlus.de>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        "KVM-ML (kvm@...r.kernel.org)" <kvm@...r.kernel.org>,
        Wanpeng Li <kernellwp@...il.com>
Subject: Re: VMs freezing when host is running 4.14

2017-11-22 16:52+0100, Marc Haber:
> On Wed, Nov 22, 2017 at 04:04:42PM +0100, 王金浦 wrote:
> > So all guest kernels are 4.14, or also other older kernel?
> 
> Guest kernels are also 4.14, but the issue disappears when the host is
> downgraded to an older kernel. I therefore reckoned that the guest
> kernel doesn't matter, but that was before I saw the trace in the log.

The two most suspicious patches since 4.13 (which I assume works) are

  664f8e26b00c ("KVM: X86: Fix loss of exception which has not yet been
  injected")

and

  9a6e7c39810e ("KVM: async_pf: Fix #DF due to inject "Page not Present"
  and "Page Ready" exceptions simultaneously")

please try reverting them to see if it helps,

thanks.