Commit 84be4212 authored by Tianrui Zhao's avatar Tianrui Zhao Committed by Huacai Chen
Browse files

LoongArch: KVM: Implement fpu operations for vcpu 



Implement LoongArch fpu related interface for vcpu, such as get fpu, set
fpu, own fpu and lose fpu, etc.

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 f6deff35

arch/loongarch/kvm/vcpu.c

+56 −0
Original line number Diff line number Diff line
@@ -402,6 +402,62 @@ long kvm_arch_vcpu_ioctl(struct file *filp, 
	return r;

}



int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)

{

	int i = 0;



	fpu->fcc = vcpu->arch.fpu.fcc;

	fpu->fcsr = vcpu->arch.fpu.fcsr;

	for (i = 0; i < NUM_FPU_REGS; i++)

		memcpy(&fpu->fpr[i], &vcpu->arch.fpu.fpr[i], FPU_REG_WIDTH / 64);



	return 0;

}



int kvm_arch_vcpu_ioctl_set_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)

{

	int i = 0;



	vcpu->arch.fpu.fcc = fpu->fcc;

	vcpu->arch.fpu.fcsr = fpu->fcsr;

	for (i = 0; i < NUM_FPU_REGS; i++)

		memcpy(&vcpu->arch.fpu.fpr[i], &fpu->fpr[i], FPU_REG_WIDTH / 64);



	return 0;

}



/* Enable FPU and restore context */

void kvm_own_fpu(struct kvm_vcpu *vcpu)

{

	preempt_disable();



	/* Enable FPU */

	set_csr_euen(CSR_EUEN_FPEN);



	kvm_restore_fpu(&vcpu->arch.fpu);

	vcpu->arch.aux_inuse |= KVM_LARCH_FPU;

	trace_kvm_aux(vcpu, KVM_TRACE_AUX_RESTORE, KVM_TRACE_AUX_FPU);



	preempt_enable();

}



/* Save context and disable FPU */

void kvm_lose_fpu(struct kvm_vcpu *vcpu)

{

	preempt_disable();



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

		kvm_save_fpu(&vcpu->arch.fpu);

		vcpu->arch.aux_inuse &= ~KVM_LARCH_FPU;

		trace_kvm_aux(vcpu, KVM_TRACE_AUX_SAVE, KVM_TRACE_AUX_FPU);



		/* Disable FPU */

		clear_csr_euen(CSR_EUEN_FPEN);

	}



	preempt_enable();

}



int kvm_arch_vcpu_precreate(struct kvm *kvm, unsigned int id)

{

	return 0;