netdev - Re: [PATCH V3 12/13] HV/Netvsc: Add Isolation VM support for netvsc driver

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Message-ID: <713480b3-f924-60dd-96a4-b6318930383f@gmail.com>
Date:   Sat, 21 Aug 2021 02:20:58 +0800
From:   Tianyu Lan <ltykernel@...il.com>
To:     Michael Kelley <mikelley@...rosoft.com>,
        KY Srinivasan <kys@...rosoft.com>,
        Haiyang Zhang <haiyangz@...rosoft.com>,
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Subject: Re: [PATCH V3 12/13] HV/Netvsc: Add Isolation VM support for netvsc
 driver

On 8/20/2021 2:14 AM, Michael Kelley wrote:
>> @@ -477,6 +521,15 @@ static int netvsc_init_buf(struct hv_device *device,
>>   		goto cleanup;
>>   	}
>>
>> +	if (hv_isolation_type_snp()) {
>> +		vaddr = netvsc_remap_buf(net_device->send_buf, buf_size);
>> +		if (!vaddr)
>> +			goto cleanup;
> I don't think this error case is handled correctly.  Doesn't the remapping
> of the recv buf need to be undone?
>

Yes, actually I thought to return error here and free_netvsc_device() 
will help to unmap recv_buffer finally. But I forget to set ret = 
-ENOMEM when add netvsc_remap_buf() helper.