This is a discussion about Xen running on the RISC-V Hypervisor extensions. The RISC-V Hypervisor extensions (currently at draft v0.6.1) are getting close to being frozen. There is currently support for QEMU emulation, KVM, QEMU/KVM and Xvisor. It would be great to have Xen support as well. This has been discussed at a previous Xen talk (see here: https://wiki.xenproject.org/wiki/Design_Sessions_2019#Xen_on_RISC-V) but not much has happened since then on the Xen side. Meanwhile the spec has been greatly improved and KVM support has emerged (although not yet been merged upstream). RFC patches have been sent to the list: https://lists.xenproject.org/archives/html/xen-devel/2020-01/msg01731.html
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