The set of extensions supported by a RISC-V system needs to be exposed to the guest - currently that is a fixed, minimal set of extensions. These extensions are not sufficient to boot Ubuntu 25.10 which now has a mininimum requirement of RVA23S64 (which is a minimum set of extensions that make sense for server use cases.) The easiest way to convey the extensions that the guest should use is to copy those that the host kernel understands (and thus includes in the /proc/cpuinfo) data. However since nested virtualisation is not currently possible - exclude the "H" (Hypervisor) extension from the list of short (single letter) extensions. Signed-off-by: Rob Bradford <rbradford@rivosinc.com> |
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