Re: [Qemu-devel] [PATCH] Inter-VM shared memory PCI device

Alexander Graf
2010-03-08T10:57:20Z

Jamie Lokier wrote:
> Alexander Graf wrote:
>
>> Or we could put in some code that tells the guest the host shm
>> architecture and only accept x86 on x86 for now. If anyone cares for
>> other combinations, they're free to implement them.
>>
>> Seriously, we're looking at an interface designed for kvm here. Let's
>> please keep it as simple and fast as possible for the actual use case,
>> not some theoretically possible ones.
>>
>
> The concern is that a perfectly working guest image running on kvm,
> the guest being some OS or app that uses this facility (_not_ a
> kvm-only guest driver), is later run on qemu on a different host, and
> then mostly works except for some silent data corruption.
>
> That is not a theoretical scenario.
>
> Well, the bit with this driver is theoretical, obviously :-)
> But not the bit about moving to a different host.
>

I agree. Hence there should be a safety check so people can't corrupt
their data silently.

Alex