Re: [Qemu-devel] [PATCH v4 5/5] i8259: fix dynamically masking slave IRQs with IMR register

[Paolo Bonzini]

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