Reviewed-by: Bibo, Mao <maobibo@xxxxxxxxxxx>
在 2023/5/30 09:52, Tianrui Zhao 写道:
> Implement kvm exception vector, using _kvm_fault_tables array to save
> the handle function pointer and it is used when vcpu handle exit.
>
> Signed-off-by: Tianrui Zhao <zhaotianrui@xxxxxxxxxxx>
> ---
> arch/loongarch/kvm/exit.c | 48 +++++++++++++++++++++++++++++++++++++++
> 1 file changed, 48 insertions(+)
>
> diff --git a/arch/loongarch/kvm/exit.c b/arch/loongarch/kvm/exit.c
> index 10f9922a7e76..625045fc95c8 100644
> --- a/arch/loongarch/kvm/exit.c
> +++ b/arch/loongarch/kvm/exit.c
> @@ -657,3 +657,51 @@ static int _kvm_handle_fpu_disabled(struct kvm_vcpu *vcpu)
> kvm_own_fpu(vcpu);
> return RESUME_GUEST;
> }
> +
> +/*
> + * Loongarch KVM callback handling for not implemented guest exiting
> + */
> +static int _kvm_fault_ni(struct kvm_vcpu *vcpu)
> +{
> + unsigned long estat, badv;
> + unsigned int exccode, inst;
> +
> + /*
> + * Fetch the instruction.
> + */
> + badv = vcpu->arch.badv;
> + estat = vcpu->arch.host_estat;
> + exccode = (estat & CSR_ESTAT_EXC) >> CSR_ESTAT_EXC_SHIFT;
> + inst = vcpu->arch.badi;
> + kvm_err("Exccode: %d PC=%#lx inst=0x%08x BadVaddr=%#lx estat=%#lx\n",
> + exccode, vcpu->arch.pc, inst, badv, read_gcsr_estat());
> + kvm_arch_vcpu_dump_regs(vcpu);
> + vcpu->run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
> +
> + return RESUME_HOST;
> +}
> +
> +static exit_handle_fn _kvm_fault_tables[EXCCODE_INT_START] = {
> + [EXCCODE_TLBL] = _kvm_handle_read_fault,
> + [EXCCODE_TLBI] = _kvm_handle_read_fault,
> + [EXCCODE_TLBNR] = _kvm_handle_read_fault,
> + [EXCCODE_TLBNX] = _kvm_handle_read_fault,
> + [EXCCODE_TLBS] = _kvm_handle_write_fault,
> + [EXCCODE_TLBM] = _kvm_handle_write_fault,
> + [EXCCODE_FPDIS] = _kvm_handle_fpu_disabled,
> + [EXCCODE_GSPR] = _kvm_handle_gspr,
> +};
> +
> +int _kvm_handle_fault(struct kvm_vcpu *vcpu, int fault)
> +{
> + return _kvm_fault_tables[fault](vcpu);
> +}
> +
> +void _kvm_init_fault(void)
> +{
> + int i;
> +
> + for (i = 0; i < EXCCODE_INT_START; i++)
> + if (!_kvm_fault_tables[i])
> + _kvm_fault_tables[i] = _kvm_fault_ni;
> +}
