Jeremy Fitzhardinge wrote:
Could we use one of the software-defined bits in the PTE to indicate that this is a foreign/granted PTE, and have set_pte_at behave differently if you pass it a pte with this bit set?
Actually, as Gerd pointed out in his answer to his own question, the use of VM_DONTCOPY cuts out this entire code path, so we don't need to worry about it.
Mind you, it looks like we're going to go ahead and use one of the PTE bits to signify foreign PTEs anyway, per Keir's suggestion. Either way, it's going to involve making Xen-specific changes to the mm code... have you any ideas how we can either (i) get rid of the zap_pte hook in the vm_operations_struct, or (ii) make a really compelling case to the kernel maintainers that it really should get in?
Regards, Derek. _______________________________________________ Virtualization mailing list Virtualization@lists.linux-foundation.org https://lists.linux-foundation.org/mailman/listinfo/virtualization
