LOONGARCH_GPR_A2
data = kvm_read_reg(vcpu, LOONGARCH_GPR_A2);
kvm_read_reg(vcpu, LOONGARCH_GPR_A2)
vcpu->run->hypercall.args[2] = kvm_read_reg(vcpu, LOONGARCH_GPR_A2);
emit_insn(ctx, addid, LOONGARCH_GPR_A2, LOONGARCH_GPR_FP, -run_ctx_off);
u8 a2 = LOONGARCH_GPR_A2;
[BPF_REG_3] = LOONGARCH_GPR_A2,