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

From: Chris Friesen
Subject: Re: [Qemu-devel] kvm bug in __rmap_clear_dirty during live migration
Date: Fri, 24 Feb 2017 09:10:11 -0600
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.3.0

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.



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

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?


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