Hi Stefano, On 10/08/15 11:50, Stefano Stabellini wrote: > On Fri, 7 Aug 2015, Julien Grall wrote: >> On ARM all dma-capable devices on a same platform may not be protected >> by an IOMMU. The DMA requests have to use the BFN (i.e MFN on ARM) in >> order to use correctly the device. >> >> While the DOM0 memory is allocated in a 1:1 fashion (PFN == MFN), grant >> mapping will screw this contiguous mapping. >> >> When Linux is using 64KB page granularitary, the page may be split >> accross multiple non-contiguous MFN (Xen is using 4KB page >> granularity). Therefore a DMA request will likely fail. >> >> Checking that a 64KB page is using contiguous MFN is tedious. For >> now, always says that biovec are not mergeable. >> >> Signed-off-by: Julien Grall <julien.gr...@citrix.com> > > Please fix the grammar in the subject line.
If I made a mistake it's unlikely that I will find myself which one I made. Anyway, I guess you mean to replace merge by merged? I don't see any other in the subject. Regards, -- Julien Grall -- 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/
