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Re: [Qemu-devel] [PATCH RFC] ps2: set the keybord output buffer size as

From: Gonglei (Arei)
Subject: Re: [Qemu-devel] [PATCH RFC] ps2: set the keybord output buffer size as the same as kernel
Date: Wed, 23 Apr 2014 09:32:43 +0000

> Hi, Gerd and Juan.
> Thanks for your guides about the confuse live migration about changing the
> keyboard buffer size.
> According your suggestion, I got two solutions to address the issue:
> - Keep the data array 256 bytes long, change the rptr/wptr/count/data array at
> post_load(), both
>  Ps/2 keyboard and mouse. This solution can be compatible with older qemu
> versions, which can
>  do live migration each other.
> -Change the data array to 16 bytes, still save as PS2_QUEUE_SIZE. Reset the
> rptr/wptr/count at
> post_load(), both ps/2 keyboard and mouse. Add VMSTATE_UNUSED(256-16) in
> struct vmstate_ps2_common.
> This solution just save the 16 bytes buffer and drop the rest, So we can't
> migrate vm to older qemu versions.
> But migration from old qemu to new qemu is ok.
Sorry, the second solution also support cross-version live migration each other.

> I have tested the two solutions, but which one is better? Expect your reply.
> Thanks!

Best regards,

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