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Message-ID: <20210201234424.GI4718@ziepe.ca> Date: Mon, 1 Feb 2021 19:44:24 -0400 From: Jason Gunthorpe <jgg@...pe.ca> To: "Tian, Kevin" <kevin.tian@...el.com> Cc: "Song Bao Hua (Barry Song)" <song.bao.hua@...ilicon.com>, "chensihang (A)" <chensihang1@...ilicon.com>, Arnd Bergmann <arnd@...db.de>, Greg Kroah-Hartman <gregkh@...uxfoundation.org>, "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, "iommu@...ts.linux-foundation.org" <iommu@...ts.linux-foundation.org>, "linux-mm@...ck.org" <linux-mm@...ck.org>, Zhangfei Gao <zhangfei.gao@...aro.org>, "Liguozhu (Kenneth)" <liguozhu@...ilicon.com>, "linux-accelerators@...ts.ozlabs.org" <linux-accelerators@...ts.ozlabs.org> Subject: Re: [RFC PATCH v2] uacce: Add uacce_ctrl misc device On Fri, Jan 29, 2021 at 10:09:03AM +0000, Tian, Kevin wrote: > > SVA is not doom to work with IO page fault only. If we have SVA+pin, > > we would get both sharing address and stable I/O latency. > > Isn't it like a traditional MAP_DMA API (imply pinning) plus specifying > cpu_va of the memory pool as the iova? I think their issue is the HW can't do the cpu_va trick without also involving the system IOMMU in a SVA mode It really is something that belongs under some general /dev/sva as we talked on the vfio thread Jason
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