How Hard Could it be to Flip a bit? KVM PV Feature Enablement up the Virtualization Stack
summary
KVM PV features exist in kernel and qemu but enabling them by default is blocked because QEMU must remain compatible with the oldest supported kernel (linux 4.5 / RHEL7), so only six PV bits are shipped by default and new features can take about five years to reach users. Proposals include linux 4.5 minimum blocks defaults, a require host kernel version per VM platform field, a per-machine-type kernel floor, an HV default set, and a runtime revoke API; live migration constraints and non‑migratable -cpu host mode are the primary practical limits.
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