Re: [Qemu-devel] scp during migration with vhost fails

["Michael S. Tsirkin" <mst@redhat.com>]

On Fri, Feb 01, 2013 at 06:03:32PM +0800, Jason Wang wrote:
> Hello all:
> 
> During testing, I find doing scp during migration with vhost fails with 
> warnings in guest like:
> 
> Corrupted MAC on input.
> Disconnecting: Packet corrupt.
> lost connection
> 
> Here's the bisect result:
> 
> Commit a01672d3968cf91208666d371784110bfde9d4f8 kvm: convert to MemoryListener 
> API is the last commit that works well.
> 
> With commit 04097f7c5957273c578f72b9bd603ba6b1d69e33 vhost: convert to 
> MemoryListener API, guest network is unusable with warning of "bad gso type"
> 
> With commit d743c382861eaa1e13f503b05aba5a382a7e7f7c vhost: fix incorrect 
> userspace address, guest network is available, but scp during migration may 
> fail.
> 
> Looks like the issue is related to memory api, any thoughts?
> 
> Thanks

Hmm this is worrying.
The problem doesn't seem to reproduce for me.  One explanation would be
that the memory table is setup incorrectly, if this happens it's very
worrying.
I think a good way to debug would be by dumping the vhost tables before
and after the change, verify that they are identical.

-- 
MST