Commit 37cdfc6d authored by Tianrui Zhao's avatar Tianrui Zhao Committed by Huacai Chen
Browse files

LoongArch: KVM: Implement handle fpu exception 



Implement handle fpu exception, using kvm_own_fpu() to enable fpu for
guest.

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 d5b65882

arch/loongarch/kvm/exit.c

+27 −0
Original line number Diff line number Diff line
@@ -631,3 +631,30 @@ static int kvm_handle_write_fault(struct kvm_vcpu *vcpu) 
{

	return kvm_handle_rdwr_fault(vcpu, true);

}



/**

 * kvm_handle_fpu_disabled() - Guest used fpu however it is disabled at host

 * @vcpu:	Virtual CPU context.

 *

 * Handle when the guest attempts to use fpu which hasn't been allowed

 * by the root context.

 */

static int kvm_handle_fpu_disabled(struct kvm_vcpu *vcpu)

{

	struct kvm_run *run = vcpu->run;



	/*

	 * If guest FPU not present, the FPU operation should have been

	 * treated as a reserved instruction!

	 * If FPU already in use, we shouldn't get this at all.

	 */

	if (WARN_ON(vcpu->arch.aux_inuse & KVM_LARCH_FPU)) {

		kvm_err("%s internal error\n", __func__);

		run->exit_reason = KVM_EXIT_INTERNAL_ERROR;

		return RESUME_HOST;

	}



	kvm_own_fpu(vcpu);



	return RESUME_GUEST;

}