Fix a bug where enabling hardware virtualization can race with a forced reboot, e.g. `reboot -f`, and result in virt hardware being enabled when the reboot is attempted, and thus hanging the reboot. Found by inspection, confirmed by hacking the reboot flow to wait until KVM loads (the problematic window is ridiculously small). Fully tested only on x86, compile tested on other architectures. v2: - Rename KVM's callback to kvm_shutdown() to match the hook. [Marc] - Don't add a spurious newline. [Marc] v1: https://lore.kernel.org/all/20230310221414.811690-1-seanjc@xxxxxxxxxx Sean Christopherson (2): KVM: Use syscore_ops instead of reboot_notifier to hook restart/shutdown KVM: Don't enable hardware after a restart/shutdown is initiated virt/kvm/kvm_main.c | 43 +++++++++++++++++++++++++++---------------- 1 file changed, 27 insertions(+), 16 deletions(-) base-commit: b3c98052d46948a8d65d2778c7f306ff38366aac -- 2.40.1.606.ga4b1b128d6-goog
