[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] [RFC XEN PATCH v2 00/15] Add vNVDIMM support to HVM domains
On Tue, Apr 04, 2017 at 11:59:03AM -0700, Dan Williams wrote: > >> I don't think KVM has the same issue, but honestly I don't have the > >> full mental model of how KVM supports mmap. I've at least been able to > >> run a guest where the "pmem" is just dynamic page cache on the host > >> side so the physical memory mapping is changing all the time due to > >> swap. KVM does not have this third-party M2P mapping table to keep up > >> to date so I assume it is just handled by the standard mmap support > >> for establishing a guest physical address range and the standard > >> mapping-invalidate + remap mechanism just works. > > > > Could it be possible to have an Xen driver that would listen on > > these notifications and percolate those changes this driver. Then > > this driver would make the appropiate hypercalls to update the M2P ? > > > > That would solve the 2/ I think? > > I think that could work. That sounds like userfaultfd support for DAX > which is something I want to take a look at in the next couple kernel > cycles for other reasons like live migration of guest-VMs with DAX > mappings. I would need to educate myself a bit more about this. But I just realized we lost Haozhong on this thread. Adding him back in, perhaps he has more experience with that. _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx https://lists.xen.org/xen-devel
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