[PATCH v3 00/16] KVM: arm64: GICv3 ITS emulation

[Peter Maydell]

On 18 March 2016 at 09:40, Christoffer Dall <christoffer.dall at linaro.org> wrote:
> On Mon, Mar 14, 2016 at 06:20:36PM +0000, Andre Przywara wrote:
>> Well, probably there is not so much difference. I was just wondering if
>> it would be easier to treat that data as an opaque blob.
>> But you are probably right that it would just mean the difference
>> between documenting the format or not.

> Even ignoring the migrate-to-TCG case, you cannot treat it as a blob,
> because you want to be able to migrate between KVM on kernel version X
> and version Y.

You could require userspace to treat it as an opaque blob, and
transparently handle any version-upgrade within the kernel.
I think having it be documented-to-userspace ABI makes it
clearer that any format changes are a Big Deal, though.

thanks
-- PMM