On Thu, Jun 27, 2013 at 10:45:01AM +0300, Michael S. Tsirkin wrote: > On Wed, Jun 26, 2013 at 03:30:23PM -0700, Guenter Roeck wrote: > > Enable support for MSI interrupts if the device supports it. > > Since MSI interrupts are edge triggered, it is no longer necessary to > > disable interrupts in the kernel and re-enable them from user-space. > > Instead, clearing the interrupt condition in the user space application > > automatically re-enables the interrupt. > > > > Signed-off-by: Guenter Roeck <[email protected]> > > --- > > An open question is if we can just do this unconditionally > > or if there should be some flag to enable it. A module parameter, maybe ? > > NACK > > UIO is for devices that don't do memory writes. > Anything that can do writes must be protected by an IOMMU > and/or have a secure kernel driver, not a UIO stub. > > MSI is done by memory writes so if userspace > controls the device it can trick it to write > anywhere in memory. > Interesting. Thanks for letting me know.
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