Max vcpu limit of 255 is too low #5345
Description
Describe the bug
The VM on Ampere Altra returns Error parsing config: Error parsing --cpus: unable to convert 256 for boot when I use --cpus boot=256,max=256.
I found the root cuase is that the size of boot_vcpus is too small,please help to fix it.
vmm/src/config.rs
CpusConfig
fn parse
let boot_vcpus: u8 = parser
.convert("boot")
.map_err(Error::ParseCpus)?
.unwrap_or(DEFAULT_VCPUS);
VM configuration
target/aarch64-unknown-linux-gnu/debug/cloud-hypervisor --cpus boot=256,max=256 --memory size=4G --kernel /home/dom/cloud-hypervisor/bin/Image --cmdline 'root=/dev/vda1 rw systemd.journald.forward_to_console=1' --disk path=/root/osdisk.img --disk path=/root/cloudinit --net tap=,mac=12:34:56:78:90:00,ip=172.19.0.1,mask=255.255.255.0,num_queues=2,queue_size=256
Guest OS version details:
cloud-hypervisor v30.0-93-gd3ac6a85
Host OS version details:
Distributor ID: Ubuntu
Description: Ubuntu 22.04.1 LTS
Release: 22.04
Codename: jammy