Re: [PATCH] swiotlb: set IO TLB segment size via cmdline

[PATCH] swiotlb: set IO TLB segment size via cmdline · Roman Skakun <hidden> · 2021-09-14
Re: [PATCH] swiotlb: set IO TLB segment size via cmdline · Jan Beulich <hidden> · 2021-09-14
Re: [PATCH] swiotlb: set IO TLB segment size via cmdline · Christoph Hellwig <hch@lst.de> · 2021-09-14
Re: [PATCH] swiotlb: set IO TLB segment size via cmdline · Stefano Stabellini <sstabellini@kernel.org> · 2021-09-15
Re: [PATCH] swiotlb: set IO TLB segment size via cmdline · Roman Skakun <hidden> · 2021-09-16
Re: [PATCH] swiotlb: set IO TLB segment size via cmdline · Roman Skakun <hidden> · 2021-09-15
Re: [PATCH] swiotlb: set IO TLB segment size via cmdline · Jan Beulich <hidden> · 2021-09-15
Re: [PATCH] swiotlb: set IO TLB segment size via cmdline · Christoph Hellwig <hch@lst.de> · 2021-09-15
Re: [PATCH] swiotlb: set IO TLB segment size via cmdline · Roman Skakun <hidden> · 2021-09-17
Re: [PATCH] swiotlb: set IO TLB segment size via cmdline · Robin Murphy <robin.murphy@arm.com> · 2021-09-17
Re: [PATCH] swiotlb: set IO TLB segment size via cmdline · Roman Skakun <hidden> · 2021-09-21
Re: [PATCH] swiotlb: set IO TLB segment size via cmdline · Jan Beulich <hidden> · 2021-09-17
Re: [PATCH] swiotlb: set IO TLB segment size via cmdline · Roman Skakun <hidden> · 2021-09-17

From: Jan Beulich <hidden>
Date: 2021-09-17 09:52:26
Also in: linux-doc, linux-iommu, linux-mips, lkml, xen-devel

On 17.09.2021 11:36, Roman Skakun wrote:

I use Xen PV display. In my case, PV display backend(Dom0) allocates
contiguous buffer via DMA-API to
to implement zero-copy between Dom0 and DomU.

Why does the buffer need to be allocated by Dom0? If it was allocated
by DomU, it could use grants to give the backend direct (zero-copy)
access.

Jan

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