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Re: [Qemu-devel] [PATCH 4/6] dirty-bitmaps: clean-up bitmaps loading and

From: Vladimir Sementsov-Ogievskiy
Subject: Re: [Qemu-devel] [PATCH 4/6] dirty-bitmaps: clean-up bitmaps loading and migration logic
Date: Tue, 18 Sep 2018 13:37:35 +0300
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.6.0

17.09.2018 21:33, John Snow wrote:

On 09/17/2018 11:51 AM, Vladimir Sementsov-Ogievskiy wrote:
Hmm, ping, anybody here ?)

Was preparing to stage on Friday, working on it now.

I never understood why you forbid the transfer of read only bitmaps
though, can you point that out for me?


readonly bitmap - means it is not marked in_use in qcow2 file.

Hm, I don't remember exact reason, but at least for shared migration it is unsafe to migrate readonly bitmap without special handling: we migrate it, it becomes not-readonly, it changes in RAM, then (assume) storing failed and we have old version ofthe bitmap in qcow2, which is not marked in_use.. So it should be somehow carefully handled, the simplest option is just to forbid it.

Best regards,

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