Re: [PATCH] KVM: SVM: Fix "error" isn't initialized

[linmiaohe <linmiaohe@huawei.com>]

On 2019/11/27 11:44, Sean Christopherson wrote:
> On Wed, Nov 27, 2019 at 03:30:06AM +0000, linmiaohe wrote:
>>
>>> From: Haiwei Li <lihaiwei@tencent.com>
>>> Subject: [PATCH] initialize 'error'
>>>
>>> There are a bunch of error paths were "error" isn't initialized.
>> Hi,
>> In case error case, sev_guest_df_flush() do not set the error.
>> Can you set the value of error to reflect what error happened in 
>> sev_guest_df_flush()?
>> The current fix may looks confused when print "DF_FLUSH failed" with 
>> error = 0.
>> Thanks.
>>
>> PS: This is just my personal point.
> 
> Disclaimer: not my world at all...
> 
> Based on the prototype for __sev_do_cmd_locked(), @error is intended 
> to be filled only if there's an actual response from the PSP, which is 
> a 16-bit value.  So maybe init @psp_ret at the beginning of 
> __sev_do_cmd_locked() to
> -1 to indicate the command was never sent to the PSP?  And update the
> pr_err() in sev_asid_flush() to explicitly state it's the PSP return?
>

I think it's a good alternative. Many Thanks.