Re: [PATCH v5] vfio/type1: Adopt fast IOTLB flush interface when unmap IOVAs

2018-03-22 Thread Alex Williamson
On Thu, 22 Feb 2018 15:59:15 -0700 Alex Williamson wrote: > On Thu, 1 Feb 2018 01:27:38 -0500 > Suravee Suthikulpanit wrote: > > > VFIO IOMMU type1 currently upmaps IOVA pages synchronously, which requires > > IOTLB flushing for every

Re: [PATCH v5] vfio/type1: Adopt fast IOTLB flush interface when unmap IOVAs

2018-02-23 Thread Alex Williamson
On Fri, 23 Feb 2018 08:20:51 + "Tian, Kevin" wrote: > > From: Alex Williamson > > Sent: Friday, February 23, 2018 6:59 AM > > > > On Thu, 1 Feb 2018 01:27:38 -0500 > > Suravee Suthikulpanit wrote: > > > > > VFIO IOMMU type1 currently

RE: [PATCH v5] vfio/type1: Adopt fast IOTLB flush interface when unmap IOVAs

2018-02-23 Thread Tian, Kevin
> From: Alex Williamson > Sent: Friday, February 23, 2018 6:59 AM > > On Thu, 1 Feb 2018 01:27:38 -0500 > Suravee Suthikulpanit wrote: > > > VFIO IOMMU type1 currently upmaps IOVA pages synchronously, which > requires > > IOTLB flushing for every unmapping. This

Re: [PATCH v5] vfio/type1: Adopt fast IOTLB flush interface when unmap IOVAs

2018-02-22 Thread Alex Williamson
On Thu, 1 Feb 2018 01:27:38 -0500 Suravee Suthikulpanit wrote: > VFIO IOMMU type1 currently upmaps IOVA pages synchronously, which requires > IOTLB flushing for every unmapping. This results in large IOTLB flushing > overhead when handling pass-through devices has