In the last part of this article, I talked about configuring a mediated device directly via sysfs. This is a bit cumbersome, and you may want to make your configuration more permanent. Fortunately, there is tooling available for this.
More …vfio-mdev has become popular over the last few years for assigning certain classes of devices to guests. On the s390x side, vfio-ccw and vfio-ap are using the vfio-mdev framework for making channel devices and crypto adapters accessible to guests.
More …QEMU has entered softfreeze for 5.1, so it is time to summarize the s390x changes in that version.
More …QEMU is currently in hardfreeze, with the 5.0 release expected at the end of the month. Here’s a quick list of some notable s390x changes.
More …The s390 channel subsystem can gather some statistics on I/O performance for you, which might be useful if you try to figure out why something is not performing as well as you’d expect it to be. From a QEMU/KVM perspective, this is currently mainly useful on the host.
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