On Mon, May 13, 2019 at 04:57:08PM +0200, Christoph Hellwig wrote: > On Mon, May 13, 2019 at 02:54:49PM +0000, mario.limoncie...@dell.com wrote: > > And NVME spec made it sound to me that while in a low power state it > > shouldn't > > be available if the memory isn't available. > > > > NVME spec in 8.9: > > > > "Host software should request that the controller release the > > assigned ranges prior to a shutdown event, a Runtime D3 event, or any other > > event > > that requires host software to reclaim the assigned ranges." > > The last part of the quoted text is the key - if the assigned range > is reclaimed, that is the memory is going to be used for something else, > we need to release the ranges. But we do not release the ranges, > as we want to keep the memory in use so that we can quickly use it > again.
Yes, this. As far as I know, the host memory range is still accessible in the idle suspend state. If there are states in which host memory is not accessible, a reference explaining the requirement will be most helpful.
