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Message-ID: <5614F3EA.5060208@scylladb.com> Date: Wed, 7 Oct 2015 13:28:58 +0300 From: Avi Kivity <avi@...lladb.com> To: "Michael S. Tsirkin" <mst@...hat.com> Cc: Avi Kivity <avi@...udius-systems.com>, Vlad Zolotarov <vladz@...udius-systems.com>, linux-kernel@...r.kernel.org, hjk@...sjkoch.de, corbet@....net, gregkh@...uxfoundation.org, bruce.richardson@...el.com, gleb@...udius-systems.com, stephen@...workplumber.org, alexander.duyck@...il.com Subject: Re: [PATCH v3 0/3] uio: add MSI/MSI-X support to uio_pci_generic driver On 10/07/2015 01:25 PM, Michael S. Tsirkin wrote: > On Tue, Oct 06, 2015 at 07:09:11PM +0300, Avi Kivity wrote: >> >> On 10/06/2015 06:15 PM, Michael S. Tsirkin wrote: >>>> While it is possible that userspace malfunctions and accidentally programs >>>> MSI incorrectly, the risk is dwarfed by the ability of userspace to program >>>> DMA incorrectly. >>> That seems to imply that for the upstream kernel this is not a valid usecase at all. >>> >> That is trivially incorrect, upstream pci_uio_generic is used with dpdk for >> years. > dpdk used to do polling for years. patch to use interrupts was posted in > june 2015. dpdk used interrupts long before that. > >> Are dpdk applications an invalid use case? > The way dpdk is using UIO/sysfs is borderline at best, and can't be used > to justify new interfaces. They have a more secure mode using VFIO. > That one's more reasonable. > Maybe this was not stressed enough times, but not all configurations have an iommu, or want to use one. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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