Re: [PATCH v2 04/12] iommu/vt-d: Add 256-bit invalidation descriptor support

2018-09-06 Thread Lu Baolu
Hi, On 09/06/2018 10:39 AM, Tian, Kevin wrote: From: Lu Baolu [mailto:baolu...@linux.intel.com] Sent: Thursday, August 30, 2018 9:35 AM Intel vt-d spec rev3.0 requires software to use 256-bit descriptors in invalidation queue. As the spec reads in section 6.5.2: Remapping hardware supporting S

RE: [PATCH v2 04/12] iommu/vt-d: Add 256-bit invalidation descriptor support

2018-09-05 Thread Tian, Kevin
> From: Lu Baolu [mailto:baolu...@linux.intel.com] > Sent: Thursday, August 30, 2018 9:35 AM > > Intel vt-d spec rev3.0 requires software to use 256-bit > descriptors in invalidation queue. As the spec reads in > section 6.5.2: > > Remapping hardware supporting Scalable Mode Translations > (ECAP_

[PATCH v2 04/12] iommu/vt-d: Add 256-bit invalidation descriptor support

2018-08-29 Thread Lu Baolu
Intel vt-d spec rev3.0 requires software to use 256-bit descriptors in invalidation queue. As the spec reads in section 6.5.2: Remapping hardware supporting Scalable Mode Translations (ECAP_REG.SMTS=1) allow software to additionally program the width of the descriptors (128-bits or 256-bits) that