Re: [Qemu-devel] [PATCH v3] hw/arm/virt: Add high MMIO PCI region

[Peter Maydell]

On 29 July 2015 at 13:05, Igor Mammedov <address@hidden> wrote:
> Now imagine that guest was started on host with 'old' layout and then has been
> migrated to a host with 'new' layout. Stability of layout matters, that's why
> we support versioned machine types and compat nightmare even if basic machine
> is the same, the same applies to ARM's virt machine.

Note that we don't support versioned machines or cross-version
migration on ARM *yet*. We will at some point but I am putting
this off for as long as I can exactly because it makes it
very painful to make changes to QEMU.

(Roughly, I plan to avoid cross-version migration until the
point where somebody comes along and says (a) they absolutely
need this and (b) they are prepared to support it in terms of
the testing effort etc. I don't think we have really ironed
out all the bugs in same-version migration on ARM yet...)

thanks
-- PMM