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Date: Wed, 31 Mar 2010 17:08:38 -0700 From: Tom Lyon <pugs@...n-about.com> To: kvm@...r.kernel.org, linux-kernel@...r.kernel.org Cc: mst@...hat.com Subject: [PATCH 0/1] uio_pci_generic: extensions to allow access for non-privileged processes uio_pci_generic has previously been discussed on the KVM list, but this patch has nothing to do with KVM, so it is also going to LKML. The point of this patch is to beef up the uio_pci_generic driver so that a non-privileged user process can run a user level driver for most PCIe devices. This can only be safe if there is an IOMMU in the system with per-device domains. Privileged users (CAP_SYS_RAWIO) are allowed if there is no IOMMU. Specifically, I seek to allow low-latency user level network drivers (non tcp/ip) which directly access SR-IOV style virtual network adapters, for use with packages such as OpenMPI. Key areas of change: - ioctl extensions to allow registration and dma mapping of memory regions, with lock accounting - support for mmu notifier driven de-mapping - support for MSI and MSI-X interrupts (the intel 82599 VFs support only MSI-X) - allowing interrupt enabling and device register mapping all through /dev/uio* so that permissions may be granted just by chmod on /dev/uio* -- 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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