On 16.01.19 12:35, David Hildenbrand wrote: > This series implements supprt for hotplug handler chaining (proposed > by Igor), something that is necessary to turn selected virtio devices into > memory devices. Planned devices inlude virtio-mem and virtio-pmem. The > current prototype of virtio-pmem is included. > > The machine hotplug handler can intercept hotplug handler calls > to properly prepare/teardown the memory device part of a device. Control > is then passed on to the actual bus hotplug handler. So the default hotplug > handler is effectively overwritten to make interception possible. > > It is based on the following patches/series > - [PULL v2 01/49] pci/pcie: stop plug/unplug if the slot is locked > -- Soon upstream > - [PATCH v1] pc: Use hotplug_handler_(plug|unplug|unplug_request) > -- Queued by Paolo > - [PATCH v2 0/6] s390x/pci: hotplug handler fixes and reworks > -- Partially queued > > Patch 1-3 are the preparations for hotplug handler chaining. The remaining > patches are a modified prototype of virtio-pmem. > > I modified Pankajs work to work with this series. virtio-pmem is included > as it was requested during review of previous preparations to showcase a > real user, so we can discuss if this is good enough for us or if we have > to do further changes. > > More details about virtio-pmem (including the Linux guest driver side) > can be found at: > https://lkml.org/lkml/2018/7/13/102 > https://lkml.org/lkml/2019/1/9/756 > > Example: defining a simple virtio-pmem device (on /dev/zero for simplicity): > > qemu-system-x86_64 \ > -machine pc \ > -monitor stdio \ > -m 8G,maxmem=20G \ > -object memory-backend-file,id=mem1,mem-path=/dev/zero,size=4G \ > -device virtio-pmem-pci,id=vp1,memdev=mem1 > > QEMU 3.0.50 monitor - type 'help' for more information > (qemu) info memory-devices > Memory device [virtio-pmem]: "vp1" > memaddr: 0x240000000 > size: 4294967296 > memdev: /objects/mem1 > > (qemu) info memory_size_summary > base memory: 8589934592 > plugged memory: 4294967296 >
The current state can be found on: https://github.com/davidhildenbrand/qemu.git : memory_device -- Thanks, David / dhildenb
