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. > 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. -- MST -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
