Messages in this thread | | | Date | Fri, 24 Feb 2017 09:10:11 -0600 | From | Chris Friesen <> | Subject | Re: [Qemu-devel] kvm bug in __rmap_clear_dirty during live migration |
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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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