Reviewed-by: Bibo, Mao <maobibo@xxxxxxxxxxx>
在 2023/5/30 09:52, Tianrui Zhao 写道:
> Implement kvm handle LoongArch vcpu idle exception, using kvm_vcpu_block
> to emulate it.
>
> Signed-off-by: Tianrui Zhao <zhaotianrui@xxxxxxxxxxx>
> ---
> arch/loongarch/kvm/exit.c | 20 ++++++++++++++++++++
> 1 file changed, 20 insertions(+)
>
> diff --git a/arch/loongarch/kvm/exit.c b/arch/loongarch/kvm/exit.c
> index bd33fe0c6424..3fdb42939a05 100644
> --- a/arch/loongarch/kvm/exit.c
> +++ b/arch/loongarch/kvm/exit.c
> @@ -188,3 +188,23 @@ int _kvm_complete_iocsr_read(struct kvm_vcpu *vcpu, struct kvm_run *run)
>
> return er;
> }
> +
> +int _kvm_emu_idle(struct kvm_vcpu *vcpu)
> +{
> + ++vcpu->stat.idle_exits;
> + trace_kvm_exit_idle(vcpu, KVM_TRACE_EXIT_IDLE);
> +
> + if (!kvm_arch_vcpu_runnable(vcpu)) {
> + /*
> + * Switch to the software timer before halt-polling/blocking as
> + * the guest's timer may be a break event for the vCPU, and the
> + * hypervisor timer runs only when the CPU is in guest mode.
> + * Switch before halt-polling so that KVM recognizes an expired
> + * timer before blocking.
> + */
> + kvm_save_timer(vcpu);
> + kvm_vcpu_block(vcpu);
> + }
> +
> + return EMULATE_DONE;
> +}
