Re: [libvirt] [PATCH v2 0/4] New mdev type handling for aggregated resources

From: Zhenyu Wang [mailto:zhenyuw@linux.intel.com] Sent: Friday, July 20, 2018 10:19 AM Current mdev device create interface depends on fixed mdev type, which get uuid from user to create instance of mdev device. If user wants to use customized number of resource for mdev device, then only can create new mdev type for that which may not be flexible. This requirement comes not only from to be able to allocate flexible resources for KVMGT, but also from Intel scalable IO virtualization which would use vfio/mdev to be able to allocate arbitrary resources on mdev instance. More info on [1] [2] [3]. To allow to create user defined resources for mdev, it trys to extend mdev create interface by adding new "instances=xxx" parameter following uuid, for target mdev type if aggregation is supported, it can create new mdev device which contains resources combined by number of instances, e.g echo "<uuid>,instances=10" > create VM manager e.g libvirt can check mdev type with "aggregation" attribute which can support this setting. If no "aggregation" attribute found for mdev type, previous behavior is still kept for one instance allocation. And new sysfs attribute "instances" is created for each mdev device to show allocated number. This trys to create new KVMGT type with minimal vGPU resources which can be combined with "instances=x" setting to allocate for user wanted resources. References: [1] https://software.intel.com/en-us/download/intel-virtualization- technology-for-directed-io-architecture-specification [2] https://software.intel.com/en-us/download/intel-scalable-io- virtualization-technical-specification [3] https://schd.ws/hosted_files/lc32018/00/LC3-SIOV-final.pdf v2: - Add new create_with_instances driver hook - Update doc for new attributes Zhenyu Wang (4): vfio/mdev: Add new instances parameter for mdev create vfio/mdev: Add mdev device instances attribute drm/i915/gvt: Add new aggregation type support Documentation/vfio-mediated-device.txt: update for aggregation attribute Documentation/vfio-mediated-device.txt | 39 +++++++++++++++--- drivers/gpu/drm/i915/gvt/gvt.c | 26 +++++++++--- drivers/gpu/drm/i915/gvt/gvt.h | 14 ++++--- drivers/gpu/drm/i915/gvt/kvmgt.c | 30 +++++++++++--- drivers/gpu/drm/i915/gvt/vgpu.c | 56 ++++++++++++++++++++++---- drivers/vfio/mdev/mdev_core.c | 19 +++++++-- drivers/vfio/mdev/mdev_private.h | 6 ++- drivers/vfio/mdev/mdev_sysfs.c | 42 ++++++++++++++++--- include/linux/mdev.h | 10 +++++ 9 files changed, 203 insertions(+), 39 deletions(-) -- 2.18.0