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...if we want to expose PMEM memory region to a guest using a > paravirtualized interface (or anything else that can be mapped into > guest memory in the form of memory regions), we could use this. The > guest->host control queue can be used for tasks that typically cannot be > done if moddeling something like this using ordinary ACPI DIMMs > (flushing etc). > > CCing a couple of people that just thought about something like this in > the concept of fake DAX. I'm not convinced that there is a use case for paravirtualized PMEM commands beyond this "fake-DAX" us...

...if we want to expose PMEM memory region to a guest using a > paravirtualized interface (or anything else that can be mapped into > guest memory in the form of memory regions), we could use this. The > guest->host control queue can be used for tasks that typically cannot be > done if moddeling something like this using ordinary ACPI DIMMs > (flushing etc). > > CCing a couple of people that just thought about something like this in > the concept of fake DAX. I'm not convinced that there is a use case for paravirtualized PMEM commands beyond this "fake-DAX" us...

...xpose PMEM memory region to a guest using a >> paravirtualized interface (or anything else that can be mapped into >> guest memory in the form of memory regions), we could use this. The >> guest->host control queue can be used for tasks that typically cannot be >> done if moddeling something like this using ordinary ACPI DIMMs >> (flushing etc). >> >> CCing a couple of people that just thought about something like this in >> the concept of fake DAX. > > I'm not convinced that there is a use case for paravirtualized PMEM > commands beyo...

...certain types. E.g. if we want to expose PMEM memory region to a guest using a paravirtualized interface (or anything else that can be mapped into guest memory in the form of memory regions), we could use this. The guest->host control queue can be used for tasks that typically cannot be done if moddeling something like this using ordinary ACPI DIMMs (flushing etc). CCing a couple of people that just thought about something like this in the concept of fake DAX. On 16.06.2017 16:20, David Hildenbrand wrote: > Hi, > > this is an idea that is based on Andrea Arcangeli's original ide...

Hi, this is an idea that is based on Andrea Arcangeli's original idea to host enforce guest access to memory given up using virtio-balloon using userfaultfd in the hypervisor. While looking into the details, I realized that host-enforcing virtio-balloon would result in way too many problems (mainly backwards compatibility) and would also have some conceptual restrictions that I want to avoid.

Hi, this is an idea that is based on Andrea Arcangeli's original idea to host enforce guest access to memory given up using virtio-balloon using userfaultfd in the hypervisor. While looking into the details, I realized that host-enforcing virtio-balloon would result in way too many problems (mainly backwards compatibility) and would also have some conceptual restrictions that I want to avoid.