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From: Tianyu Lan <ltykernel@gmail.com>
To: Christoph Hellwig <hch@lst.de>
Cc: dave.hansen@linux.intel.com, luto@kernel.org,
	peterz@infradead.org, tglx@linutronix.de, mingo@redhat.com,
	bp@alien8.de, x86@kernel.org, hpa@zytor.com, jgross@suse.com,
	sstabellini@kernel.org, boris.ostrovsky@oracle.com,
	kys@microsoft.com, haiyangz@microsoft.com,
	sthemmin@microsoft.com, wei.liu@kernel.org, decui@microsoft.com,
	joro@8bytes.org, will@kernel.org, davem@davemloft.net,
	kuba@kernel.org, jejb@linux.ibm.com, martin.petersen@oracle.com,
	m.szyprowski@samsung.com, robin.murphy@arm.com,
	xen-devel@lists.xenproject.org, michael.h.kelley@microsoft.com,
	Tianyu Lan <Tianyu.Lan@microsoft.com>,
	iommu@lists.linux-foundation.org, linux-hyperv@vger.kernel.org,
	linux-kernel@vger.kernel.org, linux-scsi@vger.kernel.org,
	netdev@vger.kernel.org, vkuznets@redhat.com,
	brijesh.singh@amd.com, konrad.wilk@oracle.com,
	parri.andrea@gmail.com, thomas.lendacky@amd.com,
	dave.hansen@intel.com
Subject: Re: [PATCH 3/5] hyperv/IOMMU: Enable swiotlb bounce buffer for Isolation VM
Date: Wed, 17 Nov 2021 22:00:08 +0800	[thread overview]
Message-ID: <c93bf3d4-75c1-bc3d-2789-1d65e7c19158@gmail.com> (raw)
In-Reply-To: <20211117100142.GB10330@lst.de>

On 11/17/2021 6:01 PM, Christoph Hellwig wrote:
> This doesn't really have much to do with normal DMA mapping,
> so why does this direct through the dma ops?
> 

According to the previous discussion, dma_alloc_noncontigous()
and dma_vmap_noncontiguous() may be used to handle the noncontigous
memory alloc/map in the netvsc driver. So add alloc/free and vmap/vunmap
callbacks here to handle the case. The previous patch v4 & v5 handles
the allocation and map in the netvsc driver. If this should not go 
though dma ops, We also may make it as vmbus specific function and keep
the function in the vmbus driver.

https://lkml.org/lkml/2021/9/28/51



  reply	other threads:[~2021-11-17 14:01 UTC|newest]

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-11-16 15:39 [PATCH 0/5] x86/Hyper-V: Add Hyper-V Isolation VM support(Second part) Tianyu Lan
2021-11-16 15:39 ` [PATCH 1/5] x86/Swiotlb: Add Swiotlb bounce buffer remap function for HV IVM Tianyu Lan
2021-11-17  9:59   ` Christoph Hellwig
2021-11-17 13:32     ` Tianyu Lan
2021-11-16 15:39 ` [PATCH 2/5] dma-mapping: Add vmap/vunmap_noncontiguous() callback in dma ops Tianyu Lan
2021-11-16 15:39 ` [PATCH 3/5] hyperv/IOMMU: Enable swiotlb bounce buffer for Isolation VM Tianyu Lan
2021-11-16 19:12   ` Borislav Petkov
2021-11-17 13:22     ` Tianyu Lan
2021-11-17 10:01   ` Christoph Hellwig
2021-11-17 14:00     ` Tianyu Lan [this message]
2021-11-19 14:23       ` Tianyu Lan
2021-11-26  7:40       ` Christoph Hellwig
2021-11-26 11:39         ` Tianyu Lan
2021-11-16 15:39 ` [PATCH 4/5] net: netvsc: Add Isolation VM support for netvsc driver Tianyu Lan
2021-11-16 15:39 ` [PATCH 5/5] scsi: storvsc: Add Isolation VM support for storvsc driver Tianyu Lan

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