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    Subject[PATCH v11 11/31] LoongArch: KVM: Implement fpu related operations for vcpu
    Date
    Implement LoongArch fpu related interface for vcpu, such as get fpu, set
    fpu, own fpu and lose fpu, etc.

    Signed-off-by: Tianrui Zhao <zhaotianrui@loongson.cn>
    ---
    arch/loongarch/kvm/vcpu.c | 60 +++++++++++++++++++++++++++++++++++++++
    1 file changed, 60 insertions(+)

    diff --git a/arch/loongarch/kvm/vcpu.c b/arch/loongarch/kvm/vcpu.c
    index 5a88f815c412..60213f7f7bac 100644
    --- a/arch/loongarch/kvm/vcpu.c
    +++ b/arch/loongarch/kvm/vcpu.c
    @@ -244,6 +244,66 @@ 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;
    +
    + /* no need vcpu_load and vcpu_put */
    + fpu->fcsr = vcpu->arch.fpu.fcsr;
    + fpu->fcc = vcpu->arch.fpu.fcc;
    + 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;
    +
    + /* no need vcpu_load and vcpu_put */
    + vcpu->arch.fpu.fcsr = fpu->fcsr;
    + vcpu->arch.fpu.fcc = fpu->fcc;
    + 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 for guest and restore context */
    +void kvm_own_fpu(struct kvm_vcpu *vcpu)
    +{
    + preempt_disable();
    +
    + /*
    + * Enable FPU for guest
    + */
    + 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 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;
    --
    2.39.1
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