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Date: Mon, 03 Sep 2012 18:33:48 +0200
From: Paolo Bonzini <pbonzini@redhat.com>
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Subject: Re: [Qemu-devel] [PATCH v4 5/5] i8259: fix dynamically masking
 slave IRQs with IMR register
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To: Avi Kivity <avi@redhat.com>
Cc: Jan Kiszka <jan.kiszka@siemens.com>, "quintela@redhat.com" <quintela@redhat.com>, Matthew Ogilvie <mmogilvi_qemu@miniinfo.net>, =?UTF-8?B?QW5kcmVhcyBGw6Q=?= =?UTF-8?B?cmJlcg==?= <afaerber@suse.de>, "qemu-devel@nongnu.org" <qemu-devel@nongnu.org>

Il 03/09/2012 18:30, Avi Kivity ha scritto:
>>>>> The values above are what every user of the PIC cascaded on our targets
>>>>> >>> > must program to use them. So We will find them in the state once any
>>>>> >>> > relevant guest code was able to run (e.g. the BIOS).
>>>>> >>> > 
>>> >> Suppose the bios has not run yet?
>> > 
>> > Then you transmit the subsection.
> And the migration fails.  Needlessly, since icw3 == 0 doesn't affect
> guest operation.

But the point of subsections is to succeed migration in the common case,
assuming there is more than one case that doesn't affect guest operation.

Paolo