linux-kernel - Re: [Resend RFC PATCH V2 11/12] HV/Netvsc: Add Isolation VM support for netvsc driver

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Date:   Thu, 15 Apr 2021 16:39:45 +0800
From:   Tianyu Lan <ltykernel@...il.com>
To:     Christoph Hellwig <hch@....de>
Cc:     kys@...rosoft.com, haiyangz@...rosoft.com, sthemmin@...rosoft.com,
        wei.liu@...nel.org, tglx@...utronix.de, mingo@...hat.com,
        bp@...en8.de, x86@...nel.org, hpa@...or.com, arnd@...db.de,
        akpm@...ux-foundation.org, gregkh@...uxfoundation.org,
        konrad.wilk@...cle.com, m.szyprowski@...sung.com,
        robin.murphy@....com, joro@...tes.org, will@...nel.org,
        davem@...emloft.net, kuba@...nel.org, jejb@...ux.ibm.com,
        martin.petersen@...cle.com, Tianyu Lan <Tianyu.Lan@...rosoft.com>,
        iommu@...ts.linux-foundation.org, linux-arch@...r.kernel.org,
        linux-hyperv@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org, linux-scsi@...r.kernel.org,
        netdev@...r.kernel.org, vkuznets@...hat.com,
        thomas.lendacky@....com, brijesh.singh@....com,
        sunilmut@...rosoft.com
Subject: Re: [Resend RFC PATCH V2 11/12] HV/Netvsc: Add Isolation VM support
 for netvsc driver



On 4/14/2021 11:50 PM, Christoph Hellwig wrote:
>> +struct dma_range {
>> +	dma_addr_t dma;
>> +	u32 mapping_size;
>> +};
> 
> That's a rather generic name that is bound to create a conflict sooner
> or later.

Good point. Will update.

> 
>>   #include "hyperv_net.h"
>>   #include "netvsc_trace.h"
>> +#include "../../hv/hyperv_vmbus.h"
> 
> Please move public interfaces out of the private header rather than doing
> this.

OK. Will update.

> 
>> +	if (hv_isolation_type_snp()) {
>> +		area = get_vm_area(buf_size, VM_IOREMAP);
> 
> Err, no.  get_vm_area is private a for a reason.
> 
>> +		if (!area)
>> +			goto cleanup;
>> +
>> +		vaddr = (unsigned long)area->addr;
>> +		for (i = 0; i < buf_size / HV_HYP_PAGE_SIZE; i++) {
>> +			extra_phys = (virt_to_hvpfn(net_device->recv_buf + i * HV_HYP_PAGE_SIZE)
>> +				<< HV_HYP_PAGE_SHIFT) + ms_hyperv.shared_gpa_boundary;
>> +			ret |= ioremap_page_range(vaddr + i * HV_HYP_PAGE_SIZE,
>> +					   vaddr + (i + 1) * HV_HYP_PAGE_SIZE,
>> +					   extra_phys, PAGE_KERNEL_IO);
>> +		}
>> +
>> +		if (ret)
>> +			goto cleanup;
> 
> And this is not something a driver should ever do.  I think you are badly
> reimplementing functionality that should be in the dma coherent allocator
> here.
>
OK. I will try hiding these in the Hyper-V dma ops callback. Thanks.