On Wed, Jan 30, 2019 at 01:09:10PM +0800, Yi Sun wrote: > Intel vt-d rev3.0 [1] introduces a new translation mode called > 'scalable mode', which enables PASID-granular translations for > first level, second level, nested and pass-through modes. The > vt-d scalable mode is the key ingredient to enable Scalable I/O > Virtualization (Scalable IOV) [2] [3], which allows sharing a > device in minimal possible granularity (ADI - Assignable Device > Interface). As a result, previous Extended Context (ECS) mode > is deprecated (no production ever implements ECS). > > This patch set emulates a minimal capability set of VT-d scalable > mode, equivalent to what is available in VT-d legacy mode today: > 1. Scalable mode root entry, context entry and PASID table > 2. Seconds level translation under scalable mode > 3. Queued invalidation (with 256 bits descriptor) > 4. Pass-through mode > > Corresponding intel-iommu driver support will be included in > kernel 5.0: > https://www.spinics.net/lists/kernel/msg2985279.html > > We will add emulation of full scalable mode capability along with > guest iommu driver progress later, e.g.: > 1. First level translation > 2. Nested translation > 3. Per-PASID invalidation descriptors > 4. Page request services for handling recoverable faults
Hi, YiSun/YiLiu, Have you tested against any existing usages of VT-d with this series applied? Thanks, -- Peter Xu
