Commit f41c8bdb authored by Tianrui Zhao's avatar Tianrui Zhao Committed by Huacai Chen
Browse files

LoongArch: KVM: Implement handle idle exception 



Implement kvm handle LoongArch vcpu idle exception, using kvm_vcpu_block
to emulate it.

Reviewed-by: default avatarBibo Mao <maobibo@loongson.cn>
Tested-by: default avatarHuacai Chen <chenhuacai@loongson.cn>
Signed-off-by: default avatarTianrui Zhao <zhaotianrui@loongson.cn>
Signed-off-by: default avatarHuacai Chen <chenhuacai@loongson.cn>
parent 81efe043

arch/loongarch/kvm/exit.c

+20 −0
Original line number Diff line number Diff line
@@ -194,3 +194,23 @@ 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;

}