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Re: [Xen-devel] Proposal for init/kexec/hotplug format for Xen

Keir Fraser wrote:

A reasonable interface to user-space, but what about when one endpoint is inside the kernel? I'm also concerned that SysV IPC is usually used between mutually trusting parties -- this is *not* necessarily the case between management services and managed domains. We need e.g., control over event-channel masking to be able to limit management resources consumed by overzealous or malicious guests.

I'm not suggesting we use the SysV interfaces, just the mechanisms (named shared memory, message queues, semaphores). As primatives, this seems like a good place to start. As interfaces, I agree that SysV is not the way to go :-)

The persistent store protocol could be implemented on top of these mechanisms. Any primatives would also have to be shared between kernel and userspace (either through common header files or perhaps a kernel interface to userspace for these mechanisms).

It's really just about generalizing what's already being used.

Anthony Liguori

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