Re: [PATCH v2] Driver for Inter-VM shared memory device for KVM supporting interrupts.

[Cam Macdonell <cam@cs.ualberta.ca>]

Avi Kivity wrote:
> Christian Bornträger wrote:
>>> To summarize, Anthony thinks it should use virtio, while I believe
>>> virtio is useful for exporting guest memory, not for importing host 
>>> memory.
>>>     
>>
>> I think the current virtio interface is not ideal for importing host 
>> memory, but we can change that. If you look at the dcssblk driver for 
>> s390, it allows a guest to map shared memory segments via a diagnose 
>> (hypercall). This driver uses PCI regions to map memory.
>>
>> My point is, that the method to map memory is completely irrelevant, 
>> we just need something like mmap/shmget between the guest and the 
>> host. We could define an interface in virtio, that can be used by any 
>> transport. In case of pci this could be a simple pci map operation.
>> What do you think about something like: (CCed Rusty)
>>   
> 
> Exactly.
> 

Agreed.