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Re: [Qemu-devel] [PATCH 2/2] atapi migration: Throw recoverable error to
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From: |
Paolo Bonzini |
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Subject: |
Re: [Qemu-devel] [PATCH 2/2] atapi migration: Throw recoverable error to avoid recovery |
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Date: |
Wed, 10 Dec 2014 23:04:37 +0100 |
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User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.2.0 |
On 09/12/2014 19:15, Dr. David Alan Gilbert (git) wrote:
> (With the previous atapi_dma flag recovery)
> If migration happens between the ATAPI command being written and the
> bmdma being started, the DMA is dropped. Eventually the guest times
> out and recovers, but that can take many seconds.
> (This is rare, on a pingpong reading the CD continuously I hit
> this about ~1/30-1/50 migrates)
>
> I don't think we've got enough state to be able to recover safely
> at this point, so I throw a 'medium error, no seek complete'
> that I'm assuming guests will try and recover from an apparently
> dirty CD.
What is the part of the state that is not being migrated? Also, what is
the ATAPI command that is being run?
Paolo