Re: [Qemu-devel] kvm bug in __rmap_clear_dirty during live migration

From	Chris Friesen <chris.friesen@windriver.com>
Newsgroups	linux.kernel
Subject	Re: [Qemu-devel] kvm bug in __rmap_clear_dirty during live migration
Date	2017-02-24 16:20 +0100
Message-ID	<tepP3-1Yk-3@gated-at.bofh.it> (permalink)
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On 02/23/2017 08:23 PM, Herongguang (Stephen) wrote:

> On 2017/2/22 22:43, Paolo Bonzini wrote:

>> Hopefully Gaohuai and Rongguang can help with this too.
>>
>> Paolo
>>
>> .
>>
> Yes, we are looking into and testing this.
>
> I think this can result in any memory corruption, if VM1 writes its
> PML buffer into VM2’s VMCS (since sched_in/sched_out notifier of VM1
> is not registered yet), then VM1 is destroyed (hence its PML buffer
> is freed back to kernel), after that, VM2 starts migration, so CPU
> logs VM2’s dirty GFNS into a freed memory, results in any memory corruption.
>
> As its severity, this commit
> (http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=4e59516a12a6ef6dcb660cb3a3f70c64bd60cfec)
>
> is eligible to back port to kernel stable.
>

Are we expecting that fix to resolve the original issue, or is it a separate 
issue that needs fixing in stable?

Chris

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Re: [Qemu-devel] kvm bug in __rmap_clear_dirty during live migration "Herongguang (Stephen)" <herongguang.he@huawei.com> - 2017-02-24 03:30 +0100
  Re: [Qemu-devel] kvm bug in __rmap_clear_dirty during live migration "Herongguang (Stephen)" <herongguang.he@huawei.com> - 2017-02-24 10:40 +0100
    Re: [Qemu-devel] kvm bug in __rmap_clear_dirty during live migration Greg KH <gregkh@linuxfoundation.org> - 2017-02-24 11:10 +0100
    Re: [Qemu-devel] kvm bug in __rmap_clear_dirty during live migration Greg KH <gregkh@linuxfoundation.org> - 2017-02-24 11:10 +0100
      Re: [Qemu-devel] kvm bug in __rmap_clear_dirty during live migration Paolo Bonzini <pbonzini@redhat.com> - 2017-02-24 11:10 +0100
  Re: [Qemu-devel] kvm bug in __rmap_clear_dirty during live migration Paolo Bonzini <pbonzini@redhat.com> - 2017-02-24 16:20 +0100
    Re: [Qemu-devel] kvm bug in __rmap_clear_dirty during live migration "Herongguang (Stephen)" <herongguang.he@huawei.com> - 2017-02-25 02:50 +0100
      Re: [Qemu-devel] kvm bug in __rmap_clear_dirty during live migration "Huang, Kai" <kai.huang@linux.intel.com> - 2017-02-27 08:50 +0100
  Re: [Qemu-devel] kvm bug in __rmap_clear_dirty during live migration Chris Friesen <chris.friesen@windriver.com> - 2017-02-24 16:20 +0100

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