On 12/01/2014 10:26 PM, Greg KH wrote: > On Mon, Dec 01, 2014 at 09:41:03AM -0600, Nathan Fontenot wrote: >> On 11/26/2014 09:12 PM, Benjamin Herrenschmidt wrote: >>> Hi Greg, >>> >>> So Nathan is working on a patch series to cleanup and improve our >>> "DLPAR" infrastructure which is basically our hotplug mechanism when >>> running under the PowerVM (aka pHyp) and KVM hypervisors. >> >> The cleanup to the dlpar infrastructure will move the entire operation >> of hotplugging a device to the kernel instead of doing it partially in >> userspace and partially in the kernel as is currently done. >> >>> >>> I'll let Nathan give you a bit more details/background and answer >>> subsequent question you might have as this is really his area of >>> expertise. >>> >>> To cut a long story short, we need a sysfs file that allows our >>> userspace tools to notify the kernel of hotplug events coming from >>> the management console (which talks to userspace daemons using a >>> proprietary protocol) to "initiate" the hotplug operations, which in >>> turn get dispatched internally in the kernel to the right subsystem >>> (memory, cpu, pci, ...) based on the resource type. >>> >>> On IRC, Greg suggested /sys/firmware and /sys/hypervisor which both >>> look like a reasonable option to me, probably better than dlpar... >> >> For PowerVM systems we need this sysfs file to deliver what is >> essentially a binary blob (specifically a rtas error log) to the >> kernel. The current patch set is creating /sys/kernel/dlpar. As Ben >> mentioned we would like your input on what would be the proper place >> to create this file. > > And what is the kernel supposed to do with such a binary blob? Parse > it? Or pass it to something else?
The kernel will parse it and perform the requested hotplug operation. > > Anyway, let's see the patches before I guess anything else, that will > determine how things work out best. I'll cc you on the next version of the patch set. -Nathan _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@lists.ozlabs.org https://lists.ozlabs.org/listinfo/linuxppc-dev