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| From: | Paolo Bonzini |
| Subject: | [Qemu-devel] Re: [PATCH] floppy: save and restore DIR register |
| Date: | Fri, 25 Mar 2011 12:56:53 +0100 |
| User-agent: | Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.2.13) Gecko/20101209 Fedora/3.1.7-0.35.b3pre.fc14 Lightning/1.0b3pre Mnenhy/0.8.3 Thunderbird/3.1.7 |
On 03/25/2011 07:27 AM, Jason Wang wrote:
We need to keep DIR register unchanged across migration, but currently it depends on the media_changed flags from block layer and we do not save/restore it which could let the guest driver think the floppy have changed after migration. To fix this, a new filed media_changed in FDrive strcutre was introduced in order to save and restore the it from block layer through pre_save/post_load callbacks.
I guess you can avoid saving if the media changed flag is zero, too (which should be the common case after the guest has booted, right?).
Paolo
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