Anthony Liguori wrote:
>> What should be done for unmodified guest where there is no PV driver in
>> the guest? Would a call to mlock() from
>> qemu/hw/pci-passthrough.c/add_pci_passthrough_device() a reasonable
>> thing to do?
>>
>>
>
> Yup. The idea is to ensure that the memory is always present, without
> necessarily taking a reference to it. This allows for memory reclaiming
> which should allow for things like NUMA page migration. We can't swap
> of course but that doesn't mean reclaimation isn't useful.
>
I don't think we can do page migration with VT-d. You need to be able
to detect whether the page has been changed by dma after you've copied
it but before you changed the pte, but VT-d doesn't allow that AFAICT.
--
Do not meddle in the internals of kernels, for they are subtle and quick to
panic.
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