Re: [PATCH 2/4] iommu/vt-d: Force IOMMU on for platform opt in hint

2018-11-12 Thread Raj, Ashok
On Mon, Nov 12, 2018 at 11:09:00AM -0700, Alex Williamson wrote: > On Mon, 12 Nov 2018 19:06:26 +0300 > Mika Westerberg wrote: > > > From: Lu Baolu > > > > Intel VT-d spec added a new DMA_CTRL_PLATFORM_OPT_IN_FLAG flag > > in DMAR ACPI table for BIOS to report compliance about platform > > init

Re: [PATCH 2/4] iommu/vt-d: Force IOMMU on for platform opt in hint

2018-11-12 Thread Alex Williamson
On Mon, 12 Nov 2018 19:06:26 +0300 Mika Westerberg wrote: > From: Lu Baolu > > Intel VT-d spec added a new DMA_CTRL_PLATFORM_OPT_IN_FLAG flag > in DMAR ACPI table for BIOS to report compliance about platform > initiated DMA restricted to RMRR ranges when transferring control > to the OS. The OS

Re: [PATCH 2/4] iommu/vt-d: Force IOMMU on for platform opt in hint

2018-11-12 Thread Raj, Ashok
On Mon, Nov 12, 2018 at 07:06:26PM +0300, Mika Westerberg wrote: > From: Lu Baolu > > Intel VT-d spec added a new DMA_CTRL_PLATFORM_OPT_IN_FLAG flag > in DMAR ACPI table for BIOS to report compliance about platform > initiated DMA restricted to RMRR ranges when transferring control > to the OS. T

[PATCH 2/4] iommu/vt-d: Force IOMMU on for platform opt in hint

2018-11-12 Thread Mika Westerberg
From: Lu Baolu Intel VT-d spec added a new DMA_CTRL_PLATFORM_OPT_IN_FLAG flag in DMAR ACPI table for BIOS to report compliance about platform initiated DMA restricted to RMRR ranges when transferring control to the OS. The OS treats this as a hint that the IOMMU should be enabled to prevent DMA a