On Thu, Jul 25, 2019 at 11:31 AM Burakov, Anatoly <anatoly.bura...@intel.com> wrote: > > On 25-Jul-19 9:05 AM, David Marchand wrote: > > On Wed, Jul 24, 2019 at 6:46 PM Anatoly Burakov > > <anatoly.bura...@intel.com> wrote: > >> > >> When IOMMU is not available, /sys/kernel/iommu_groups will not be > >> populated. This is happening since at least 3.6 when VFIO support > >> was added. If the directory is empty, EAL should not pick IOVA as > >> VA as the default IOVA mode. > >> > >> We also assume that VFIO equals IOMMU, so if VFIO support is not > >> compiled, we always assume IOMMU support is not available. > > > > Not sure I agree with this statement. > > What about unknown (from eal pov) kernel drivers? > > Are there any cases where we can use IOVA as VA mode without having VFIO > compiled?
If a pmd relies on a kernel driver we don't know in EAL. This is not the case afaik, but I'd prefer we don't mix vfio and iommu. -- David Marchand
