Re: [PATCH v5 3/4] kvmtool: Handle exit reason KVM_EXIT_SYSTEM_EVENT

[Will Deacon <will.deacon@arm.com>]

On Wed, Oct 01, 2014 at 11:34:54AM +0100, Anup Patel wrote:
> The KVM_EXIT_SYSTEM_EVENT exit reason was added to define
> architecture independent system-wide events for a Guest.
> 
> Currently, it is used by in-kernel PSCI-0.2 emulation of
> KVM ARM/ARM64 to inform user space about PSCI SYSTEM_OFF
> or PSCI SYSTEM_RESET request.
> 
> For now, we simply treat all system-wide guest events as
> shutdown request in KVMTOOL.
> 
> Signed-off-by: Pranavkumar Sawargaonkar <pranavkumar@linaro.org>
> Signed-off-by: Anup Patel <anup.patel@linaro.org>
> Reviewed-by: Andre Przywara <andre.przywara@arm.com>
> ---
>  tools/kvm/kvm-cpu.c |   21 +++++++++++++++++++++
>  1 file changed, 21 insertions(+)
> 
> diff --git a/tools/kvm/kvm-cpu.c b/tools/kvm/kvm-cpu.c
> index ee0a8ec..5180039 100644
> --- a/tools/kvm/kvm-cpu.c
> +++ b/tools/kvm/kvm-cpu.c
> @@ -160,6 +160,27 @@ int kvm_cpu__start(struct kvm_cpu *cpu)
>  			goto exit_kvm;
>  		case KVM_EXIT_SHUTDOWN:
>  			goto exit_kvm;
> +		case KVM_EXIT_SYSTEM_EVENT:
> +			/*
> +			 * Print the type of system event and
> +			 * treat all system events as shutdown request.
> +			 */
> +			switch (cpu->kvm_run->system_event.type) {
> +			case KVM_SYSTEM_EVENT_SHUTDOWN:
> +				printf("  # Info: shutdown system event\n");
> +				goto exit_kvm;
> +			case KVM_SYSTEM_EVENT_RESET:
> +				printf("  # Info: reset system event\n");
> +				printf("  # Info: KVMTOOL does not support VM reset\n");
> +				printf("  # Info: please re-launch the VM manually\n");

Can you use pr_info here instead?

> +				goto exit_kvm;
> +			default:
> +				printf("  # Warning: unknown system event type=%d\n",
> +				       cpu->kvm_run->system_event.type);

and pr_warning here? (be sure to drop the '\n's).

Will