linux-kernel - Re: kvm: unable to handle kernel NULL pointer dereference

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Message-ID: <20080605183447.GL30402@sequoia.sous-sol.org>
Date:	Thu, 5 Jun 2008 11:34:47 -0700
From:	Chris Wright <chrisw@...s-sol.org>
To:	Tobias Diedrich <ranma+kernel@...edrich.de>,
	Chris Wright <chrisw@...s-sol.org>,
	Avi Kivity <avi@...ranet.com>, kvm@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	"Roedel, Joerg" <Joerg.Roedel@....com>
Subject: Re: kvm: unable to handle kernel NULL pointer dereference

* Tobias Diedrich (ranma+kernel@...edrich.de) wrote:
> PM: Creating hibernation image: 
> PM: Need to copy 126181 pages
> PM: Normal pages needed: 126181 + 1024 + 38, available pages: 397721
> x86 PAT enabled: cpu 0, old 0x7040600070406, new 0x7010600070106
> svm_cpu_init: svm_data is NULL on 0

Yeah, this is broken.  What happens is:

suspend:
  hardware_disable
    svm_hardware_disable
      kfree(svm_data)
      per_cpu(svm_data) = NULL

resume:
  hardware_enable
    svm_hardware_enable
      if(!svm_data) printk("svm_cpu_init: svm_data is NULL on 0")

at this point it is broken.

Same would happen on an SMP box by simply doing offline/online of a CPU.
This is definitely busted, looking into a patch.

thanks,
-chris
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