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LoongArch: KVM: Implement fpu operations for vcpu

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

Reviewed-by: Bibo Mao <maobibo@loongson.cn>
Tested-by: Huacai Chen <chenhuacai@loongson.cn>
Signed-off-by: Tianrui Zhao <zhaotianrui@loongson.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
This commit is contained in:
Tianrui Zhao
2023-10-02 10:01:28 +08:00
committed by Huacai Chen
parent f6deff355b
commit 84be4212dc
1 changed files with 56 additions and 0 deletions
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56
arch/loongarch/kvm/vcpu.c
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@@ -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;