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Re: [PATCH V4 00/13] x86/Hyper-V: Add Hyper-V Isolation VM support
- To: Tianyu Lan <ltykernel@xxxxxxxxx>
- From: Christoph Hellwig <hch@xxxxxx>
- Date: Thu, 2 Sep 2021 09:51:31 +0200
- Cc: Christoph Hellwig <hch@xxxxxx>, kys@xxxxxxxxxxxxx, haiyangz@xxxxxxxxxxxxx, sthemmin@xxxxxxxxxxxxx, wei.liu@xxxxxxxxxx, decui@xxxxxxxxxxxxx, catalin.marinas@xxxxxxx, will@xxxxxxxxxx, tglx@xxxxxxxxxxxxx, mingo@xxxxxxxxxx, bp@xxxxxxxxx, x86@xxxxxxxxxx, hpa@xxxxxxxxx, dave.hansen@xxxxxxxxxxxxxxx, luto@xxxxxxxxxx, peterz@xxxxxxxxxxxxx, konrad.wilk@xxxxxxxxxx, boris.ostrovsky@xxxxxxxxxx, jgross@xxxxxxxx, sstabellini@xxxxxxxxxx, joro@xxxxxxxxxx, davem@xxxxxxxxxxxxx, kuba@xxxxxxxxxx, jejb@xxxxxxxxxxxxx, martin.petersen@xxxxxxxxxx, gregkh@xxxxxxxxxxxxxxxxxxx, arnd@xxxxxxxx, m.szyprowski@xxxxxxxxxxx, robin.murphy@xxxxxxx, brijesh.singh@xxxxxxx, thomas.lendacky@xxxxxxx, Tianyu.Lan@xxxxxxxxxxxxx, pgonda@xxxxxxxxxx, martin.b.radev@xxxxxxxxx, akpm@xxxxxxxxxxxxxxxxxxxx, kirill.shutemov@xxxxxxxxxxxxxxx, rppt@xxxxxxxxxx, hannes@xxxxxxxxxxx, aneesh.kumar@xxxxxxxxxxxxx, krish.sadhukhan@xxxxxxxxxx, saravanand@xxxxxx, linux-arm-kernel@xxxxxxxxxxxxxxxxxxx, xen-devel@xxxxxxxxxxxxxxxxxxxx, rientjes@xxxxxxxxxx, ardb@xxxxxxxxxx, michael.h.kelley@xxxxxxxxxxxxx, iommu@xxxxxxxxxxxxxxxxxxxxxxxxxx, linux-arch@xxxxxxxxxxxxxxx, linux-hyperv@xxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, linux-scsi@xxxxxxxxxxxxxxx, netdev@xxxxxxxxxxxxxxx, vkuznets@xxxxxxxxxx, parri.andrea@xxxxxxxxx, dave.hansen@xxxxxxxxx
- Delivery-date: Thu, 02 Sep 2021 07:51:50 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On Tue, Aug 31, 2021 at 11:20:06PM +0800, Tianyu Lan wrote:
>> If so I suspect the best way to allocate them is by not using vmalloc
>> but just discontiguous pages, and then use kmap_local_pfn where the
>> PFN includes the share_gpa offset when actually copying from/to the
>> skbs.
>>
> When netvsc needs to copy packet data to send buffer, it needs to caculate
> position with section_index and send_section_size.
> Please seee netvsc_copy_to_send_buf() detail. So the contiguous virtual
> address of send buffer is necessary to copy data and batch packets.
Actually that makes the kmap approach much easier. The phys_to_virt
can just be replaced with a kmap_local_pfn and the unmap needs to
be added. I've been mostly focussing on the receive path, which
would need a similar treatment.
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