Re: [Qemu-devel] [PULL v1 0/7] MMIO Exec pull request

[Peter Maydell]

On 17 July 2017 at 19:58, Dr. David Alan Gilbert <address@hidden> wrote:
> * Edgar E. Iglesias (address@hidden) wrote:
>> Is there a way we can prevent migration of the RAMBlock?
>
> Not yet, I think we'd have to:
>    a) Add a flag to the RAMBlock
>    b) Set it/clear it on registration
>    c) Have a RAMBLOCK_FOREACH_MIGRATABLE macro
>    d) Replace all of the RAMBLOCK_FOREACH (and the couple of hand coded
>    cases) with the RAMBLOCK_FOREACH_MIGRATABLE
>    e) Worry about the corner cases!
>
> I've got a few worries about what happens when the kernel tries to
> do dirty yncing - I'm not sure if we have to change anything on that
> interface to skip those RAMBlocks.

Why would we need to skip those RAM blocks? We get correct
behaviour whether the memory is sync'd with the kernel
or not, because we're not going to migrate it anywhere.

thanks
-- PMM